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Вид документа : Статья из журнала
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Автор(ы) : Dai X., Zou X., Zhang H., Chen W., Yang C., Molokeev M. S., Xia Z., Liu Y., Zhang X., Zheng M., Lei B.
Заглавие : Novel Cr3+-doped garnet phosphor with broadband efficient far-red emission for photochrome matching plant-lighting
Колич.характеристики :9 с
Место публикации : Adv. Opt. Mater. - 2024. - Vol. 12, Is. 11. - Ст.2302380. - ISSN 21951071 (eISSN), DOI 10.1002/adom.202302380
Примечания : Cited References: 54. - The work was supported by the National Natural Science Foundations of China (No. 12274144), the Guangdong Provincial Special Fund for Modern Agriculture Industry Technology Innovation Teams (No. 2023KJ122), the Key Realm R&D Program of Guangdong Province (No. 2021B0707010003), the Guangdong Provincial Science and Technology Project (No. 2022A1515010229), and the Project of GDUPS (2018) for Prof. Bingfu LEI
Аннотация: Cr3+-doped phosphors are highly recognized in various fields for their remarkable luminous efficiency and spectral flexibility, including modern agriculture and horticulture. However, the shortage of suitable Cr3+-doped phosphors for far-red LED devices has inhibited their popularization in plant lighting. Herein, an innovative Cr3+-doped phosphor Ca2YAl3Ge2O12:Cr3+ (CYAG:Cr3+), achieving a broad far-red emission at 770 nm upon 450 nm blue light excitation is designed. The optimal CYAG:Cr3+ phosphor exhibits a high internal quantum yield of 78.2% and low thermal-quenching behavior of 85%@373 K. Thus, the fabricated phosphor-converted LEDs (pc-LEDs) for plant far-red lighting have a high output power of 33.3 mW and photovoltaic conversion efficiency of 11.5% at 100 mA. The potential of CYAG:Cr3+ in plant lighting is assessed by supplementing the far-red lighting of Italian lettuce with fabricated pc-LEDs, and the biomass of Italian lettuce is significantly increased by 33%. The successful development of CYAG:Cr3+ phosphors provides a high-quality option for plant far-red light devices and further stimulates the development of new Cr3+-doped plant-lighting phosphors.
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Вид документа : Статья из журнала
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Автор(ы) : Ouyang Sh., Yin J., Su L., Yao M., Wang G., Yang J., Molokeev M. S., Zhou Zh., Zhang S., Xia M.
Заглавие : Highly efficient and thermostable far-red phosphor for promoting root growth in plants
Колич.характеристики :8 с
Место публикации : J. Mater. Chem. C. - 2024. - Vol. 12, Is. 9. - P.3272-3279. - ISSN 20507526 (ISSN), DOI 10.1039/D3TC02823B. - ISSN 20507534 (eISSN)
Примечания : Cited References: 59. - The authors would like to gratefully acknowledge funds from the National Natural Science Foundation of China (Grant No. 51974123), the Key R&D Projects in Hunan Province (2021SK2047, 2022NK2044), the Natural Science Foundation of Hunan Province, China (Grant No. 2021JJ40261), the Wangcheng Science and Technology Plan (KJ221017), the Science and Technology Innovation Program of Hunan Province (2022WZ1022) and Superior Youth Project of the Science Research Project of Hunan Provincial Department of Education, (22B0211) and the Russian Federation as part of World-class Research Center Program: "Advanced Digital Technologies", contract no. 075-15-2020-935
Аннотация: Phytochrome PFR plays a key role in plant photomorphogenesis, and its perception of far-red light is essential, but how to obtain an efficient far-red phosphor to achieve accurate light filling remains a huge challenge. In this study, Gd1−y−zAl3−x(BO3)4:xCr3+,yLu3+,zSm3+ (GAB:xCr3+,yLu3+,zSm3+) series phosphors were synthesized by a high-temperature solid-state method. By doping Lu3+, the emission intensity of Cr3+ could increase as high as 20%. With the introduction of Sm3+, the emission intensity of Cr3+ was further increased by 29%. Particularly, the emission spectra can be tuned by varying the concentration ratio of Sm3+ and Cr3+, more suitable for the absorption spectrum of PFR. Moreover, the internal quantum yield and external quantum yield of GL0.1AB:0.03Cr3+ and GL0.1AB:0.03Cr3+,0.003Sm3+ were 83.1% and 24.7% and 78.1% and 26.3%, respectively. There were high anti-thermal quenching properties in the prepared phosphors at 423 K, with 107.6% (GAB:0.03Cr3+), 103.1% (GL0.1AB:0.03Cr3+), and 102.7% (GL0.1AB:0.003Sm3+,0.03Cr3+). Finally, the phosphors were made into pc-LED devices, which can realize the adjustable orange-red and far-red luminescence and meet the needs of plant lighting applications. In the light-regulated plant growth experiment, compared with the control group, far-red light promoted root growth in plants, confirming the application potential of the prepared phosphors in indoor plant cultivation.
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Вид документа : Статья из журнала
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Автор(ы) : Yang Ch., Zheng D., Zou X., Dai X., Tang B., Molokeev M. S., Zhang X., Zhang H., Liu Y., Lei B.
Заглавие : Highly-efficiency far-red emission in Cr3+ activated Ca1.8Mg1.2Al2Ge3O12 toward plant precise lighting
Колич.характеристики :9 с
Место публикации : Adv. Opt. Mater. - 2024. - Ст.2303235. - Article in press. - ISSN 21951071 (eISSN), DOI 10.1002/adom.202303235
Примечания : Cited References: 48. - The work was supported by the National Natural Science Foundations of China (No. 12274144), the Guangdong Provincial Special Fund for Modern Agriculture Industry Technology Innovation Teams (No. 2023KJ122), the Key Realm R&D Program of Guangdong Province (No. 2021B0707010003), the Guangdong Provincial Science and Technology Project (No. 2022A1515010229), and the Project of GDUPS (2018) for Prof. Bingfu LEI
Аннотация: Far-red (FR) region (beyond 700 nm) lighting sources possess special potential for plant lighting. However, it remains a challenge to obtain high-performance Cr3+-doped FR phosphors. This study developed a FR phosphor, Ca1.8Mg1.2Al2Ge3O12:Cr3+ (CMAGG: Cr3+), using the cation substitution strategy. Under 438 nm blue light excitation, the phosphors display FR emission centered at 720 nm with a full width at half maximum (FWHM) of 91 nm. Benefit from the favorable match with the FR phytochrome (Pfr), the phosphor is combined with InGaN blue light chips to create a FR phosphor-converted light-emitting diode (pc-LED), which is used in Italian lettuce growth experiments and it results shown in a 15% increase in fresh weight and a 6.5% increase in dry weight. Notably, supplemental FR light modulated its growth morphology. The results of this study will be useful for further research on novel Cr3+-doped FR phosphors to meet the precise spectral requirements for plant growth.
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Вид документа : Статья из журнала
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Автор(ы) : Yang, Zhiyu, Zhao, Yifei, Ueda, Jumpei, Molokeev M. S., Shang, Mengmeng, Xia, Zhiguo
Заглавие : Engineering charge-transfer interactions for red-emitting SrLa(Sc,Ga)O4:Ce3+ phosphor with improved thermal stability
Место публикации : Sci. China Mater. - 2023. - Vol. 66, Is. 5. - P.1989-1996. - ISSN 20958226 (ISSN), DOI 10.1007/s40843-022-2315-9. - ISSN 21994501 (eISSN)
Примечания : Cited References: 32. - This work was supported by the National Key Research and Development Program of China (2021YFE0105700), the National Natural Science Foundations of China (51972118), the Natural Science Foundation of Shandong Province (ZR2021ZD10 and ZR2018JL016), Guangzhou Science & Technology Project (202007020005), and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01X137). This work was also funded by Russian Foundation for Basic Research (19-52-80003)
Аннотация: Blue-light-excitable red-emitting phosphors with high thermal stability are essential for fabricating white light-emitting diodes (WLEDs). Herein, Ce3+-doped SrLaScO4 (SLO:Ce3+) phosphor is discovered to have an abnormal red emission band centered at 640 nm when excited at 440 nm. Spectroscopy and structural analyses confirm that Ce3+ ions occupy the [LaO8] polyhedrons competitively, generating a strong crystal field splitting and a large Stokes shift to produce a red emission. To further restrict the thermal quenching of SLO:Ce3+, charge-transfer engineering is implemented by incorporating a large electronegative Ga3+ in the Sc3+ site, which can attract more charges from nearby coordinating groups to decrease the electronic occupation at the bottom of the conduction band and thereby enlarge the band gap. Sc/Ga substitution in SrLa(Sc,Ga)O4:Ce3+ enhances the thermal stability by increasing the intensity ratio from 15% to 31% at 150°C compared with 20°C. This is attributed to the efficient suppression of the thermally stimulated ionization process. This study presents a general design principle for discovering novel Ce3+-doped red phosphors with good thermal stability for WLED applications.
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Вид документа : Статья из журнала
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Автор(ы) : Wu, Yanzheng, Li, Weiqiang, Zheng, Yifan, Xu, Yiqin, Wen, Dawei, Molokeev M. S., Pan, Zaifa
Заглавие : Apatite oxynitride phosphor (Mg,Y)5Si3(O,N)13:Ce3+,Mn2+: A single-phased host with solar-like and efficient emission
Место публикации : J. Am. Ceram. Soc. - 2023. - Vol. 106, Is. 5. - P.2985-2996. - ISSN 00027820 (ISSN), DOI 10.1111/jace.18981. - ISSN 15512916 (eISSN)
Примечания : Cited References: 35. - This work was supported by the National Natural Science Foundation of China (Project No. 10804099, 21804119), Key projects of Zhejiang Natural Science Foundation (Project No. LZ18B050002), GDAS’ Project of Science and Technology Development (Nos. 2021GDASYL-20210103069, 2021GDASYL-20210103071)
Аннотация: During pursuing high color rendering index for full-color-emitting phosphor, low quantum efficiency (QE) is usually accompanying. We intend to elevate the luminescence efficiency when realizing a solar-like spectra distribution, by constructing apatite structure oxynitride, inheriting high covalence and rigidity from oxynitride, and suitable multiple cation sites from oxyapatite compounds. Full-color-emitting apatite structure oxynitride phosphor (Mg,Y)5Si3(O,N)13:Ce3+,Mn2+ has been prepared, and the crystal sites’ occupancies of activators in this host were favorable for white emission. (Mg,Y)5Si3(O,N)13:Ce3+,Mn2+ phosphor shows whole visible light with emission wavelength ranging from 370 to 750 nm, matching the spectra of sunlight quite well. The fabricated white light-emitting diode lamp demonstrated the distinctive overall performance of QE and chromaticity properties (Ra and R9). Furthermore, correlated color temperature is tunable from cool nature to warm white. The obtained lamp possesses the feature of less blue light hazard and high saturation of red degree, compared with the commercial YAG-based lamp.
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Вид документа : Статья из журнала
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Автор(ы) : Lyu, Kuangnan, Liu, Gaochao, Molokeev M. S., Xia, Zhiguo
Заглавие : Double-site occupation triggered broadband and tunable NIR-I and NIR-II luminescence in AlNbO4:Cr3+ phosphors
Место публикации : Adv. Phys. Res. - 2023. - Vol. 2, Is. 4. - Ст.2200056. - ISSN 27511200 (eISSN), DOI 10.1002/apxr.202200056
Примечания : Cited References: 38. - This research was supported by the International Cooperation Project of the National Key Research and Development Program of China (2021YFB3500400 and 2021YFE0105700), National Natural Science Foundations of China (Grant No. 51972118), Guangzhou Science & Technology Project (202007020005), the State Key Laboratory of Luminescent Materials and Devices (Skllmd-2022-02), and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01×137). This work was also funded by RFBR according to the research project No. 19-52-80003
Аннотация: Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) are desired for optoelectronic and biomedical applications, while the development of target broadband NIR phosphors still remains a significant challenge. Herein, a kind of Cr3+-doped AlNbO4 phosphors with a broad NIR emission ranging from 650 to 1400 nm under 450 nm excitation are reported. A giant red-shift emission peak from 866 to 1020 nm together with broadened full width at half-maximum of 320 nm is achieved simply by varying the doped Cr3+ concentrations. Structural and spectroscopy analysis demonstrate that a concentration-dependent site-occupation of Cr3+ emitters in different Al3+ sites is responsible for the tunable NIR luminescence. The as-fabricated NIR pc-LED based on optimized AlNbO4:Cr3+ phosphor exhibits great potential in night-vision applications. This work provides a novel design principle on the Cr3+-doped AlNbO4 phosphor with tunable broadband luminescence from NIR-I to NIR-II, and these materials can be employed in NIR spectroscopy applications.
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Вид документа : Статья из журнала
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Автор(ы) : Gao, Huabo, Molokeev M. S., Chen, Qi, Min, Xin, Ma, Bin
Заглавие : Novel AMoO4:Eu3+ (A = Ca and Ba) optical thermometer: Investigation of effect of local ionic coordination environment on optical performance and temperature measurement sensitivity
Место публикации : Ceram. Int. - 2023. - Vol. 49, Is. 16. - P.26803-26810. - ISSN 02728842 (ISSN), DOI 10.1016/j.ceramint.2023.05.217. - ISSN 18733956 (eISSN)
Примечания : Cited References: 52. - The work was supported by the program of Science and Technology International Cooperation Project of Qinghai province (No. 2022-HZ-807) and the National Natural Science Foundation of China (Grant No. 51802172), and was carried out within the framework of the Strategic Academic Leadership Program “Priority-2030′′ for the Siberian Federal University
Аннотация: A range of Eu3+-doped AMoO4 (A = Ca and Ba) phosphors were successfully synthetized, and their crystal structures, optical performance, and temperature measurement sensitivities were investigated in detail. Peak doping concentration of CaMoO4:Eu3+ phosphor was 0.18, while peak doping concentration of BaMoO4:Eu3+ phosphor may be greater than 0.18. Then, temperature-dependent photoluminescence emission spectra of representative CaMoO4:0.09Eu3+ and BaMoO4:0.03Eu3+ phosphors were recorded. CaMoO4:0.09Eu3+ phosphor exhibited abnormal thermal quenching, which was attributed to defects caused by heterovalent substitution of ions and increase in the temperature, and good thermal stability. Finally, the possibility of using both phosphors as optical thermometers was discussed, which exhibited good temperature sensitivity. However, CaMoO4:0.09Eu3+ phosphor exhibited two peak absolute (Sa, 1.28 %K−1 and 1.39 %K−1) and relative sensitivities (Sr, 1.21 %K−1 and 1.20 %K−1). In addition, variation trend of Sr value with temperature was considerably peculiar. Two optimum Sa and Sr values were attributed to abnormal thermal quenching of CaMoO4:0.09Eu3+ phosphor. Peak Sa and Sr values of BaMoO4:0.03Eu3+ phosphor was 12.39 %K−1 and 0.89 %K−1, respectively. In addition, Sa of AMoO4:Eu3+ phosphor was negatively related to Eu3+ central asymmetry, while peak Sr value was more inclined to appropriate ionic central asymmetry.
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Вид документа : Статья из журнала
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Автор(ы) : Ma, Yibiao, Li, Siying, Wei, Jiaqi, Quan, Beibei, Liao, Weifang, Molokeev M. S., Cheng, Ming, Chen, Xiaoyan, Zhou, Zhi, Xia, Mao
Заглавие : Spectroscopically enhanced far-red phosphor Li2Mg3TiO6: Cr3+ and its application prospects to cold resistance of rice
Колич.характеристики :9 с
Место публикации : Mater. Adv. - 2023. - Vol. 4, Is. 22. - P.5808-5816. - ISSN 26335409 (eISSN), DOI 10.1039/D3MA00654A
Примечания : Cited References: 41. - This work was supported by the National Natural Science Foundation of China (Grant No. 51974123), the Key R & D Projects in Hunan Province (2021SK2047, 2022NK2044), the Natural Science Foundation of Hunan Province, China (Grant No. 2021JJ40261), Wangcheng Science and Technology Plan (KJ221017), the science and technology innovation Program of Hunan Province (2022WZ1022). The work was supported by the Ministry of Science and Higher Education of the Russian Federation as part of World-class Research Center program: “Advanced Digital Technologies”, contract no. 075-15-2020-935
Аннотация: Chemical unit co-substitution is a very effective strategy to improve the properties of phosphors. Due to the mismatch of the radii between substituted ions, unexpected properties are usually produced. Such properties are of profound significance to expand the research field. In this study, Mg2+-Ti4+ in Li2Mg3TiO6: Cr3+ was replaced by Al3+-Al3+ and Ga3+-Ga3+, while charge balance was maintained. Ion substitution changed the crystal field environment of activator ion, which increased the luminescence intensity by 180% and 184% respectively, accompanied by a slight decrease in thermal stability. In addition, the quantum efficiency was increased from 35.1% to 73.1%. The electroluminescence spectrum of the encapsulated pc-LED was examined, and the overlap with the absorption profile of the phytochrome Pfr was 61%. In order to verify the application prospect of far-red phosphor. A 15-day rice growth experiment was set up to detect surface traits, soluble sugars, soluble proteins, and the expression of OsphyA and OsCBF3 genes. It was demonstrated that rice under far-red light irradiation had significant resistance enhancement.
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Вид документа : Статья из журнала
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Автор(ы) : Li Y., Gai S., Zhu H., Yin J., Guo W., Molokeev M. S., Lu X., Xia M., Zhou Z.
Заглавие : Abnormal Bi3+ activated NIR phosphor toward multifunctional LED applications
Колич.характеристики :10 с
Место публикации : Ceram. Int. - 2023. - Vol. 49, Is. 23, Pt. B. - P.39671-39680. - ISSN 02728842 (ISSN), DOI 10.1016/j.ceramint.2023.09.322. - ISSN 18733956 (eISSN)
Примечания : Cited References: 45. - This research was jointly supported by the National Natural Science Foundation of China (Grant No. 51974123 ), the Key R & D Projects in Hunan Province ( 2021SK2047 , 2022NK2044 ), the Natural Science Foundation of Hunan Province, China (Grant No. 2021JJ40261 ), Wangcheng Science and Technology Plan ( KJ221017 ), the Science and Technology Innovation Program of Hunan Province ( 2022WZ1022 ) and the Strategic Academic Leadership Program “Priority-2030” for the Siberian Federal University
Аннотация: Herein, the strategy of replacing Ge4+ with smaller Si4+ was adopted to realize the site-selective occupation of Bi3+ activator in the small ring and obtain a near-infrared light-emitting in Zn2(Ge,Si)O4. The designed phosphor exhibits a broad NIR emission with FWHM ≈104 nm in the 650−860 nm region, with a center emission wavelength of about 750 nm. Interestingly, the more sensitive four-member ring sites gradually replaced the six-member ring sites and realized a large-scope photoluminescence regulation from blue to NIR by just after the crystal field engineering. The possible reasons for this phenomenon can be interpreted by centroid shift (εc) and crystal field splitting (εcfs). This work not only provides new insights for the development of Bi3+-activated NIR-emitting phosphors, but also provides thoughts for revealing the potential NIR luminous mechanism of Bi3+.
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Вид документа : Статья из журнала
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Автор(ы) : Gerasimova Yu. V., Aleksandrovsky A. S., Laptash N. M., Krylov A. S., Gerasimov M. A., Dubrovskiy A. A.
Заглавие : Raman scattering, absorption and luminescence spectroscopy of CoSiF6·6H2O crystal and CoSiF6·6H2O:Mn4+ red-emitting phosphor
Колич.характеристики :6 с
Место публикации : Opt. Mater. - 2023. - Vol. 144. - Ст.114343. - ISSN 09253467 (ISSN), DOI 10.1016/j.optmat.2023.114343. - ISSN 18731252 (eISSN)
Примечания : Cited References: 30. - The reported study was funded by Russian Science Foundation , Government of Krasnoyarsk Territory and Krasnoyarsk Regional Foundation of Science according to the research project ‘‘Synthesis, spectral and magnetic properties of ABF6·6H2O systems, new materials for photonics.” No. 23-22-10037 . https://rscf.ru/en/project/23-22-10037/ . Usage of equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS is acknowledged. We thank A. Yu. Mamaev for recording the luminesce spectra of CoSiF6·6H2O:Mn 4+
Аннотация: CoSiF6·6H2O and CoSiF6·6H2O:Mn4+ crystals were investigated by means of Raman, optical absorption, and luminescence spectroscopy. Absorption spectra of CoSiF6·6H2O are analyzed by Tanabe-Sugano technique and are proved to be well-describable at crystal field strength Dq = 1000 cm−1, and Racah parameters B = 896 cm−1, C = 4408 cm−1, Dq/B = 1.116. Raman spectroscopy reveals a phase transition associated with the ordering of both the CoO6 and SiF6 octahedra, which occurs through the ordering of the H2O subsystem. Luminescence spectrum of Mn4+ ions in CoSiF6·6H2O lattice consists of six components corresponding to Stokes and anti-Stokes emission from 2E state of Mn4+ ion at vibrational frequencies of MnF6 octahedron ν6 = 230 cm−1, ν4 = 335 cm−1, and ν3 = 645 cm−1. Quantum efficiency of red emission maximizes at excitation wavelength 357 nm and equals to 5%. Decrease of quantum efficiency in comparison to other related materials is explained by absorption of Co2+ ions and non-radiative relaxation in the Co2+ subsystem.
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11.

Вид документа : Статья из журнала
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Автор(ы) : Liu, Gaochao, Molokeev M. S., Xia, Zhiguo
Заглавие : Structural rigidity control toward Cr3+-based broadband near-infrared luminescence with enhanced thermal stability
Коллективы : International Cooperation Project of the National Key Research and Development Program of China [2021YFE0105700]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [51972118, 51961145101]; Guangzhou Science & Technology Project [202007020005]; Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01X137]; RFBRRussian Foundation for Basic Research (RFBR) [19-52-80003]
Место публикации : Chem. Mat. - 2022. - Vol. 34, Is. 3. - P.1376-1384. - ISSN 0897-4756, DOI 10.1021/acs.chemmater.1c04131. - ISSN 1520-5002(eISSN)
Примечания : Cited References: 59. - This work was supported by the International Cooperation Project of the National Key Research and Development Program of China (2021YFE0105700) , National Natural Science Foundation of China (Nos.: 51972118 and 51961145101) , Guangzhou Science & Technology Project (202007020005) , and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01X137) . This work was also funded by RFBR according to the research Project No. 19-52-80003
Предметные рубрики: PHOSPHOR
PHOTOLUMINESCENCE
EFFICIENT
EMISSION
CR3+
Аннотация: Broadband near-infrared (NIR) light sources based on phosphor-converted light-emitting diodes (pc-LEDs) are desirable for biochemical analysis and medical diagnosis applications; however, the development of target NIR phosphor is still a challenge. Herein, broadband NIR phosphors, Cr3+-activated CaSc1–xAl1+xSiO6 (λem = 950 nm), are designed and optimized by chemical substitution toward enhanced quantum efficiency and thermal stability. Structural and spectral analyses along with density functional theory calculations reveal that Sc3+/Al3+ substitution contributes to enhancing the structural rigidity and the local symmetry of the [Sc/AlO6] octahedron so that the nonradiative relaxation of Cr3+ emission centers is suppressed significantly. The as-fabricated phosphor-in-glass-based NIR LED light source demonstrates great potential in the detection of alcohol concentration. This study provides a local structure design principle for exploring NIR phosphors with enhanced thermal stability and will also stimulate further studies on material discovery and quantitative analysis of NIR spectroscopy.
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12.

Вид документа : Статья из журнала
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Автор(ы) : Ming, Hong, Zhao, Yifei, Zhou, Yayun, Molokeev M. S., Wang, Yuanjing, Zhang, Shuai, Song, Enhai, Ye, Shi, Xia, Zhiguo, Zhang, Qinyuan
Заглавие : Shining Mn4+ in 0D organometallic fluoride hosts towards highly efficient photoluminescence
Место публикации : Adv. Opt. Mater. - 2022. - Vol. 10, Is. 7. - Ст.2102141. - ISSN 2195-1071, DOI 10.1002/adom.202102141
Примечания : Cited References: 40. - This work is financially supported by the National Science Foundation of China (Grants Nos. 51472088, 51972117, and U1601205), Basic and Applied Basic Research Foundation of Guangdong Province (2021A1515012415), Guangzhou Science and Technology Planning Project (202002030098 and 202102020125), and Fundamental Research Funds for the Central Universities (2020ZYGXZR050). This work was also funded by RFBR according to the research project No. 19-52-80003
Предметные рубрики: RED PHOSPHOR
Аннотация: The design and discovery of Mn4+-activated fluoride phosphors that can secure both high luminescence efficiency and short fluorescence lifetime simultaneously are crucial and urgent for constructing high-quality wide-color gamut (WCG) backlight display applications. Herein, a series of brand-new Mn4+-activated narrow-band red-emitting phosphors with both high external quantum efficiency (EQE, 50%) and short fluorescence lifetime (τ ≤ 3.8 ms) are designed by introducing Mn4+ into newfound tetramethylammonium (Me4N)-based organometallic fluoride (Me4N)2BF6 (B = Ge, Ti, Zr) hosts. These intriguing properties of Mn4+ arise from the larger steric hindrance of (Me4N)+ cations and low local structure symmetry in the 0D (Me4N)2BF6, as verified by the structural and spectral analyses. (Me4N)2GeF6:Mn4+, as a representative, shows a high EQE of ≈64.6% and a short lifetime of ≈3.78 ms. A prototype projector with superb performance is assembled by employing a remote (Me4N)2GeF6:Mn4+-based white light-emitting diode with high luminous efficiency (≈143.09 lm W−1) and WCG (≈112.02% National Television System Committee (NTSC)) to demonstrate their great potentials for backlight applications. The research brings up a promising alternative as the host materials for Mn4+-doped fluoride phosphors and provides a deeper understanding on the correlation between structure and luminescence.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gao P. -X., Dong P., Zhou Z. -Y., Zhang X. -J., Li Y. -N., Yang J. -K., Li Q., Chen K., Molokeev M. S., Zhou Z., Xia M.
Заглавие : Novel far-red phosphors (La, Gd, Y)2MgTiO6:Cr3+ with tunable luminescence spectra for grow light
Разночтения заглавия :
Место публикации : Faguang Xuebao/Chin. J. Lumines. - 2022. - Vol. 43, Is. 1. - P.58-68. - ISSN 10007032 (ISSN), DOI 10.37188/CJL.20210327
Примечания : Cited References: 27. - Supported by National Natural Science Foundation of China(51974123); The Distinguished Youth Foundation of Hunan Province(2020JJ2018); Key R & D Projects in Hunan Province(2020WK2016&2020SK2032&2022NK2044), Hunan High Level Talent Gathering Project(2019RS1077&2020RC5007); Natural Science Foundation of Hunan Province(2021JJ40261); The Scientific Research Fund of Hunan Provincial Education Department(19C0903); The Natural Sciences Foundation of Hunan Agricultural University(19QN11); Hunan Provincial Key Laboratory of Crop Germplasm Innovation and Resource Utilization Science Foundation(19KFXM12); Changsha Science and Technology Plan(KH2005114)
Аннотация: Cr3+-activated double perovskite structure phosphor has drawn wide attention due to its far-red and near-infrared emission. In this work, we synthesized a series of (La,Gd,Y)2MgTiO6∶Cr3+ phosphors which can be excited by ultraviolet light of about 345 nm, and the emission bands are in the range of 700-900 nm. The spectra were tuned by ions substitution strategy. The main emission peaks were blue shifted from 766 nm to 737 nm and 757 nm by substituting the La site with Gd and Y, respectively. Meanwhile, the thermal stability at 150 ℃ increased from 41.7% to 69.1% and 67%, respectively. The crystal structure, microstructure, decay time, thermal stability and band gap were investigated systematically. The substitution of Gd/Y ions causes the lattice contraction, which results in the change of the nephelauxetic effect, and eventually leads to the blue shift of the spectra. The emission spectra of these phosphors have good matching with the 730 nm absorption peak of phytochrome FR(PFR), indicating their application prospect in plant growth lighting. Cationic substitution strategy can regulate the luminescence properties of Cr3+, which provides ideas for the development of phosphors for plant growth lamps in the future.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zou X., Wang X., Zhang H., Kang Y., Yang X., Zhang X., Molokeev M. S., Lei B.
Заглавие : A highly efficient and suitable spectral profile Cr3+-doped garnet near-infrared emitting phosphor for regulating photomorphogenesis of plants
Место публикации : Chem. Eng. J. - 2022. - Vol. 428. - Ст.132003. - ISSN 13858947 (ISSN), DOI 10.1016/j.cej.2021.132003
Примечания : Cited References: 46. - The work was supported from the National Natural Science Foundations of China (Nos. 21671070, 51802101), the Guangdong Basic and Applied Basic Research Foundation (No. 2021A1515012613), the Guangdong Provincial Science & Technology Project (Nos. 2020A1414010046, 2021A0505050006), the Guangzhou Science & Technology Project (No. 202007020005), the Natural Science Foundation of Guangdong Province (No. 2018A030310217), the Project of GDUPS (2018) for Prof. Bingfu LEI, and the Guangdong Provincial Special Fund for Modern Agriculture Industry Technology Innovation Teams (Nos. 2021KJ131 , 2021KJ122)
Аннотация: Far-red/phytochrome (PFR) plays a key role in photomorphogenesis of plants. However, how to obtain a near-infrared (NIR) emitting phosphor with high external quantum efficiency (EQE), suitable spectral profile, and low thermal quenching remains a huge challenge. Herein, a NIR phosphor, Gd2.4Lu0.6Ga4AlO12:Cr3+,H3BO3 (GLGA:Cr3+) was developed via regulating the crystal field environment and adding fluxes, which exhibits a peak maximum at 728 nm with a relatively narrow full-width at half maximum (FWHM) of 107 nm, matching well with the absorption band of PFR. Upon 450 nm excitation, the internal quantum efficiency (IQE) and EQE of the optimal phosphor are 90.3% and 32.0%, respectively. At 423 K, the integrated emission intensity of the investigated phosphor is about 75% of that at room temperature. Benefiting from the excellent optical performance, a NIR phosphor-converted light-emitting diode (pc-LED) was fabricated, which shows a NIR output power of 505.99 mW and photoelectric conversion efficiency of 11.24% at 300 mA. Moreover, plant growth experiments demonstrate that the biomass of pea seedlings is increased by 67.72% under supplementary NIR light irradiation. The findings of this research will motivate further research on new Cr3+-doped NIR phosphors for regulating photomorphogenesis of plants.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yang, Zhiyu, Zhao, Yifei, Zhou, Yayun, Qiao, Jianwei, Chuang, Yu-Chun, Molokeev M. S., Xia, Zhiguo
Заглавие : Giant red-shifted emission in (Sr,Ba)Y2O4:Eu2+ phosphor toward broadband near-infrared luminescence
Коллективы : International Cooperation Project of National Key Research and Development Program of China [2021YFE0105700]; National Natural Science Foundations of ChinaNational Natural Science Foundation of China (NSFC) [51972118, 51961145101]; Guangzhou Science & Technology Project [202007020005]; Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01X137]; RFBRRussian Foundation for Basic Research (RFBR) [19-52-80003]
Место публикации : Adv. Funct. Mater. - 2022. - Vol. 32, Is. 1. - Ст.2103927. - ISSN 1616-301X, DOI 10.1002/adfm.202103927. - ISSN 1616-3028(eISSN)
Примечания : Cited References: 60. - This research was supported by the International Cooperation Project of National Key Research and Development Program of China (2021YFE0105700), National Natural Science Foundations of China (Grant No. 51972118 and 51961145101), Guangzhou Science & Technology Project (202007020005), and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01X137). This work is also funded by RFBR according to the research project No. 19-52-80003
Предметные рубрики: LIGHT-SOURCES
PHOTOLUMINESCENCE
TRANSITION
CE3+
BLUE
SUBSTITUTION
Аннотация: Near-infrared (NIR) light-emitting diodes (LEDs) light sources are desirable in photonic, optoelectronic, and biological applications. However, developing broadband red and NIR-emitting phosphors with good thermal stability is always a challenge. Herein, the synthesis of Eu2+-activated SrY2O4 red phosphor with high photoluminescence quantum efficiency and broad emission band ranging from 540 to 770 nm and peaking at 620 nm under 450 nm excitation is designed. Sr/Ba substitution in SrY2O4:Eu2+ has been further utilized to achieve tunable emission by modifying the local environment, which facilitates the giant red-shifted emission from 620 to 773 nm while maintaining the outstanding thermal stability of SrY2O4:Eu2+. The NIR emission is attributed to the enhanced Stokes shift and crystal field strength originated from the local structural distortions of [Y1/Eu1O6] and [Y2/Eu2O6]. The investigation in charge distribution around Y/Eu provides additional insight into increasing covalency to tune the emission toward the NIR region. As-fabricated NIR phosphor-converted LEDs demonstration shows its potential in night-vision technologies. This study reveals the NIR luminescence mechanism of Eu2+ in oxide-based hosts and provides a design principle for exploiting Eu2+-doped NIR phosphors with good thermal stability.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhang S., Gai S., Zhang X., Xia M., Zhou Z., Cheng X., Yao M., Molokeev M. S., Feng Q.
Заглавие : Enhanced luminescence properties of Li2MgTiO4: Mn4+, Ge4+ phosphor via single cation substitution for indoor plant cultivation
Место публикации : Ceram. Int. - 2022. - Vol. 48. Is. 3. - P.3070-3080. - ISSN 02728842 (ISSN), DOI 10.1016/j.ceramint.2021.10.082
Примечания : Cited References: 41. - The authors would like to gratefully acknowledge funds from National Natural Science Foundation of China (Grant No. 51974123), the Distinguished Youth Foundation of Hunan Province (Grant No. 2020JJ2018), Key R & D projects in Hunan Province (2020WK2016 & 2020SK2032), Hunan High Level Talent Gathering Project (2019RS1077 & 2020RC5007), the Natural Sciences Foundation of Hunan Agricultural University (19QN11), Hunan Provincial Key Laboratory of Crop Germplasm Innovation and Resource Utilization Science Foundation (19KFXM12), Changsha Science and technology plan (KH2005114), and the Scientific Research Fund of Hunan Provincial Education Department (19C0903)
Аннотация: Red and far-red emitting phosphors have been widely used in phosphor-converted light emitting diode (pc-LED) devices to provide lighting for indoor plant growth, thus achieving desired product qualities. Among the many ways to optimize phosphors’ optical performance, cationic substitution is one of the most effective methods. In this study, red phosphors (Li2MgTi1-x-yO4: xMn4+, yGe4+) were synthesized by high temperature solid state method and the optical performance of phosphors were improved with increasing Ge4+ constituents. In particular, luminescence intensity of Li2MgTiO4: 0.002Mn4+, 0.1Ge4+ increased by 152% under 468 nm excitation, and the thermostability of emission intensity increases from 22% (y = 0) to 43% (y = 0.1), which is about twice as much. Finally, pc-LED device was fabricated via the red phosphor Li2MgTiO4: 0.002Mn4+,0.1Ge4+ coated on a 470 nm ultraviolet chip. By changing the proportion of the phosphor, the electroluminescence spectra of pc-LED device could match well with the absorption regions of plant pigments. Therefore, Li2MgTiO4: 0.002Mn4+, 0.1Ge4+ phosphor has potential application in plant lighting. Furthermore, this work can offer some helpful references for improving luminescent efficiency by simply modulating the chemical composition.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yan W., Wei Y., Molokeev M. S., Wang S., Li G.
Заглавие : Green-emitting Bi3+-doped La2SrSc2O7 phosphor for pc-WLED lighting: Luminescent properties and energy transfer strategy
Место публикации : J. Alloys Compd. - 2022. - Vol. 908. - Ст.164621. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2022.164621
Примечания : Cited References: 63. - This work was supported by the National Natural Science Foundation of China (Grant Nos. 52072349)
Аннотация: The crystal structure, photoluminescence properties, thermal stability and corresponding mechanisms of the novel Bi3+, Eu3+-doped La2SrSc2O7 (LSS) phosphors have been measured and analyzed in details. The emission spectrum of LSS: 1.0%Bi3+ phosphor shows a novel green emission centered at 530 nm under 340 nm excitation, which is attributed to the 3P1→1S0 transition of Bi3+ ions. By designing Bi3+→Eu3+energy transfer strategy, luminescence colors of LSS: 1.0%Bi3+, yEu3+ (y = 0–5.0%) phosphors can be tuned from green to orange with increasing Eu3+ concentration, which achieve multiple emission colors in LSS host. The photoluminescence decay curves, average decay lifetimes, energy transfer efficiency and time-resolved emission spectra of LSS: 1.0%Bi3+, yEu3+ (y = 0–5.0%) phosphors prove the existence of energy transfer from Bi3+ to Eu3+. The prototype pc-WLED device with green-emitting LSS: 1.0%Bi3+ possesses high color rendering index (CRI = 96.0) and low correlated color temperature (CCT = 4306 K). These results provide clear evidences that LSS: Bi3+and LSS: 1.0%Bi3+, Eu3+ phosphors would be novel promising green-to-orange tunable phosphor candidates for pc-WLED applications.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zou X., Zhang H., Li W., Zheng M., Molokeev M. S., Xia Z., Zheng Y., Li Q., Liu Y., Zhang X., Lei B.
Заглавие : Ultra-wide Vis–NIR Mg2Al4Si5O18:Eu2+,Cr3+ phosphor containing unusual NIR luminescence induced by Cr3+ occupying tetrahedral coordination for hyperspectral imaging
Место публикации : Adv. Opt. Mater. - 2022. - Vol. 10. Is. 19. - Ст.2200882. - ISSN 21951071 (ISSN), DOI 10.1002/adom.202200882
Примечания : Cited References: 48. - The work was supported from the National Natural Science Foundations of China (No. 21671070, 51802101), the Guangdong Basic and Applied Basic Research Foundation (No. 2021A1515012613), the Independent Research and Development Projects of Maoming Laboratory (No. 2021ZZ004), the Key Realm R&D Program of Guangdong Province (No. 2021B0707010003), the Guangdong Provincial Science & Technology Project (No. 2020A1414010046), the Guangzhou Science & Technology Project (No. 202007020005, 202103000059, and 202102020410), the Project of GDUPS (2018) for Prof. Bingfu LEI, the Guangdong Provincial Special Fund for Modern Agriculture Industry Technology Innovation Teams (No. 2021KJ122), and the Natural Science Foundation of Guangdong Province (No. 2022A1515010229, 2018A030310217)
Аннотация: Cr3+-activated broadband near-infrared (NIR) phosphors, featured by the octahedral coordination preference and strong absorption in visible (Vis) region, have great potential application in nondestructive assessment. It is still a challenge to develop Cr3+-doped phosphors with the tetrahedrally coordinated Cr3+ NIR emission behavior and ultra-wide Vis–NIR luminescence. Herein, an unusual NIR-emitting Mg2Al4Si5O18:Cr3+ phosphor offers emission peak at 867 nm with full-width at half-maximum of 237 nm due to preferential occupation of the AlO4 tetrahedra by Cr3+ as demonstrated by structural and optical properties studies. Eu2+–Cr3+ energy transfer is proposed to induce ultra-wide Vis–NIR Mg2Al4Si5O18:Eu2+,Cr3+ phosphors with more efficient NIR emission and lower thermal quenching behavior of Cr3+. The fabricated Vis–NIR phosphor-converted light-emitting diode is expected to be an alternative to halogen lamp in hyperspectral imaging. This work reveals the luminescence behavior of Cr3+ in tetrahedra and demonstrates the application of Mg2Al4Si5O18:Eu2+,Cr3+ phosphor in hyperspectral imaging, which will facilitate further research on NIR and Vis–NIR phosphors.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chen J., Zou X., Li W., Zhang H., Zhang X., Molokeev M. S., Liu Y., Lei B.
Заглавие : Strategy to construct high thermal-stability narrow-band green-emitting Si-CDs@MAs phosphor for wide-color-gamut backlight displays
Место публикации : Adv. Opt. Mater. - 2022. - Vol. 10, Is. 21. - Ст.2200851. - ISSN 21951071 (ISSN), DOI 10.1002/adom.202200851
Примечания : Cited References: 47. - The work was supported by the Ministry of Science and Technology of China (No. G2021030022L), the Guangdong Provincial Special Fund for Modern Agriculture Industry Technology Innovation Teams (No. 2021KJ122), the National Natural Science Foundations of China (No. 52102042), the Independent Research and Development Projects of Maoming Laboratory (No. 2021ZZ004), the Key Realm R&D Program of Guangdong Province (No. 2021B0707010003), the Guangzhou Science & Technology Project (Nos. 202007020005 and 202103000059), the Guangdong Provincial Science and Technology Project (Nos. 2021A0505050006 and 2022A1515010229), and the Project of GDUPS (2018) for B.L.
Аннотация: Developing innovative narrow-band green-emitting phosphors featuring low thermal quenching and eco-friendliness for white light-emitting diode (WLED) backlights is a pivotal challenge. Benefitting from narrowband and low toxicity of green-emitting silanized carbon dots (Si-CDs), an efficient confinement and protection strategy through embedding Si-CDs in mesoporous aluminas (MAs) is proposed to construct MAs and Si-CDs composites (Si-CDs@MAs) with superior luminescence properties. Si-CDs@MAs phosphor exhibits green emission at 526 nm with narrow full width at half maximum of 51 nm, zero-thermal quenching even up to 423 K (104.1%@423 K of the emission peak intensity at 298 K), and the internal quantum efficiency of 64.46%. Compared with broad-band yellow-emitting solid-state Si-CDs (S-Si-CDs), the thermal stability, photostability, and water stability of Si-CDs@MAs phosphor are remarkably improved due to surface protection. The WLED backlight is fabricated with optimized Si-CDs@MAs phosphor, which shows high luminous efficacy of 117.43 lm W?1 and wide color gamut (107% NTSC). Furthermore, this work provides the design principles of realizing stable narrow-band solid-state fluorescence carbon dots, suggesting its great potential for wide-color-gamut display application.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gai S. J., Zhou C., Peng L., Wu M. H., Gao P. X., Su L. J., Molokeev M. S., Zhou Z., Xia M.
Заглавие : A novel Cr3+-doped stannate far red phosphor for plant lighting: structure evolution, broad-narrow spectrum tuning and application prospect
Место публикации : Mater. Today Chem. - 2022. - Vol. 26. - Ст.101107. - ISSN 24685194 (ISSN), DOI 10.1016/j.mtchem.2022.101107
Примечания : Cited References: 50. - The authors would like to gratefully acknowledge funds from the National Natural Science Foundation of China (Grant No. 51974123), the Distinguished Youth Foundation of Hunan Province (Grant No.2020JJ2018), the Key R & D projects in Hunan Province (2020WK2016, 2020SK2032, 2021SK2047, 2022NK2044), the Natural Science Foundation of Hunan Province, China (Grant No. 2021JJ40261), the Hunan High Level Talent Gathering Project (2019RS1077&2020RC5007), the Scientific Research Fund of Hunan Provincial Education Department (19C0903), the Natural Sciences Foundation of Hunan Agricultural University, China (Grant No. 19QN11), Hunan Provincial Key Laboratory of Crop Germplasm Innovation and Resource Utilization Science Foundation (19KFXM12), Changsha Science and technology plan (KH2005114 and KH2201428), the Hunan Graduate Scientific Research Innovation Project (2022XC017) and the College Students' Innovative Training (S202110537012 and s202210537079x)
Аннотация: Chemical unit cosubstitution is an effective strategy to regulate the luminescence properties of phosphors, and it has attracted huge attention in the last few years. Following the design principles of the match of effective ion radius, atomic valence equilibrium and stoichiometric substitution, the local structure of crystal can be well customized, which is beneficial to develop high-performance luminescent materials. In this work, Mg2+-Sn4+ sites were cosubstituted by Zn2+-Ti4+ ion pairs in Mg2SnO4: Cr3+, respectively, and the emission spectra was successfully serially tuned from broad-band to narrow-band along with a unique variation trend of blue shift first and then slightly red shift. The photoluminescence excitation (PLE), photoluminescence (PL) spectra, lifetime decay, Raman spectra and electron paramagnetic resonance (EPR) were used to analyze the mechanism of luminescence tuning. Based on the manipulation of local structure, the as-observed distinct luminescence tuning can be well understood by the crystal field theory, nephelauxetic effect and changed Cr3+ capacity in this phosphor. Moreover, the adjusted narrow-band far-red emission spectra peak at 732 nm, matching the characteristic absorption of plant phytochrome PFR, has broad application prospects in the field of plant growth lighting. In addition, light-regulated dwarf potted tomato experiments were carried out to verify the application of far-red light in plant growth.
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