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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yun, Xiangyan, Zhou, Jun, Zhu, Yaohui, Molokeev M. S., Jia, Yetong, Wei, Chao, Xu, Denghui, Sun, Jiayue
Заглавие : Thermometry and up-conversion luminescence of Ln3+ (Ln = Er, Ho, Tm)-doped double molybdate LiYbMo2O8
Место публикации : J. Mater. Sci.: Mater. Electron. - 2020. - Vol. 31, Is. 21. - P.18370-18380. - ISSN 0957-4522, DOI 10.1007/s10854-020-04382-8. - ISSN 1573-482X(eISSN)
Примечания : Cited References: 41. - This work is supported by the National Natural Science Foundation of China (No. 21576002 and 61705003) and Beijing Technology and Business University Research Team Construction Project (No. PXM2019_014213_000007)
Предметные рубрики: TEMPERATURE SENSING BEHAVIOR
OPTICAL THERMOMETRY
EMISSION
PHOSPHOR
Аннотация: The discovery of stable and highly sensitive up-conversion (UC) phosphors using the fluorescence intensity ratio (FIR) is a significant challenge in the field of optical temperature sensor. Er3+/Ho3+/Tm3+-doped LiYbMo2O8 UC phosphors with excellent luminescence properties were successfully synthesized through a high-temperature solid-state reaction, and the crystal structure and UC luminescence properties were discussed in detail. The UC process has been investigated by spectra pump power dependence and further explained via the energy level diagram. All emission processes about Er3+ ions and Ho3+ ions are two-photon processes and the blue emission process about Tm3+ ions is a combination of two-photon process and three-photon process. Thermal sensing performances depended on FIR technology were estimated and the sensitivities of LiYb1−xMo2O8:xLn3+ included absolute sensitivity (Sa) and relative sensitivity (Sr) can produce particular change rules with the temperature, which can serve as excellent candidates for applications in optical temperature sensing. With the increase of temperature, the maximum values of Sr of LiYb1−xMo2O8:xLn3+ are 1.16% K−1 (0.05Er3+), 0.25% K−1 (0.01Ho3+), and 0.51% K−1 (0.01Tm3+), respectively. In addition, the Sa value of LiYb0.95Mo2O8:0.05Er3+ phosphor will reach the maximum (1.08% K−1) at 475 K, while the maximum values of Sa of LiYb0.99Mo2O8:0.01Ho3+ and LiYb0.99Mo2O8:0.01Tm3+ are 0.16% K−1, 0.14% K−1.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhou J., Chen Y., Jiang C., Milicevic B., Molokeev M. S., Brik M. G., Bobrikov I. A., Yan J., Li J., Wu M.
Заглавие : High moisture resistance of an efficient Mn4+-activated red phosphor Cs2NbOF5:Mn4+ for WLEDs
Место публикации : Chem. Eng. J. - 2021. - Vol. 405. - Ст.126678. - ISSN 13858947 (ISSN), DOI 10.1016/j.cej.2020.126678
Примечания : Cited References: 43. - This work was financially supported by grants from the National Natural Science Foundation of China (No. 51802359, 21801254, 51902354) and its Joint Funds of Yunnan and Guangdong Province (No. U1702254 and No. U1801253), Special Fund of Guangdong Province Project for Applied Science and Technology Research and Development (No. 2017B090917001), Guangdong Basic and Applied Basic Research Foundation (No. 2020A1515010556), the Fundamental Research Funds for the Central Universities (No. 19lgpy123), and China Postdoctoral Science Foundation (No. 2019M663230). M. G. Brik thanks the supports from the National Recruitment Program of High-end Foreign Experts (No. GDT20185200479 and GDW20145200225), the Programme for the Foreign Experts (No. W2017011) and Wenfeng High-end Talents Project (No. W2016-01) offered by Chongqing University of Posts and Telecommunications (CQUPT) , Estonian Research Council grant PUT PRG111, and European Regional Development Fund (TK141)
Аннотация: Mn4+-activated fluoride red phosphors, the most important red phosphors for warm white light emitting diodes (LEDs), usually suffer from inherent poor moisture resistance which is a major obstacle to their long-lasting outdoor applications in a high humidity environment. Surface modification of phosphors by coating with either organic or inorganic shells is an effective way to improve waterproof stability. However, the coating procedure usually has a negative impact on the luminous efficacy due to the increased passivation shell thickness. In this work, Mn4+-activated oxyfluoroniobate (Cs2NbOF5), a highly efficient phosphor with internal quantum efficiency of ca. 82%, has been successfully synthesized and it is interesting to note that Cs2NbOF5:Mn4+ can exhibit remarkably improved waterproof stability even without surface coating compared to well-accepted commercial fluoride red-emitting phosphor, K2SiF6:Mn4+. The results obtained indicate that Nb5+ ions inside red phosphor play a crucial role in improving the water-resistant performance of Mn4+, which provides a new concept for overcoming the downside of their waterproof in humid conditions and maintaining the luminescence efficiency. In the final phase white LEDs with a high luminous efficacy of 174 lm/W (higher than commercial fluoride red phosphors), low correlated color temperature (3164 K) and high color rendering index (Ra = 90 and R9 = 85) have been fabricated using Cs2NbOF5:Mn4+.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Liu, Gaochao, Molokeev M. S., Lei, Bingfu, Xia, Zhiguo
Заглавие : Two-site Cr3+ occupation in the MgTa2O6:Cr3+ phosphor toward broad-band near-infrared emission for vessel visualization
Место публикации : J. Mater. Chem. C. - 2020. - Vol. 8, Is. 27. - P.9322-9328. - ISSN 2050-7526, DOI 10.1039/d0tc01951h. - ISSN 2050-7534(eISSN)
Примечания : Cited References: 52. - The present work was supported by the National Natural Science Foundations of China (Grant No. 51972118, 51961145101 and 51722202), Fundamental Research Funds for the Central Universities (D2190980), the Guangzhou Science & Technology Project (202007020005), the Guangdong Provincial Science & Technology Project (No. 2018A050506004), 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
PHOSPHOR
LUMINESCENCE
PHOTOLUMINESCENCE
Аннотация: Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) have great potential in photonic, optoelectronic and biological applications, while the discovery of a broad-band NIR phosphor still remains a challenge. Here, we report a novel Cr3+-activated MgTa2O6 phosphor with an asymmetrical emission band ranging from 700 to 1150 nm and a large full width at half maximum (FWHM) of 140 nm upon 460 nm blue light excitation. The broad spectrum is assigned to the overlap of two bands centered at 910 and 834 nm, which originate from the spin-allowed transition of 4T2 → 4A2 for different Cr3+ ions located in the two six-coordinated crystallographic sites of Mg2+ and Ta5+, respectively. The distribution of blood vessels and bones in human palm and wrist is observed with the assistance of a commercial NIR camera and a fabricated pc-LED, which demonstrates that the MgTa2O6:Cr3+ phosphor is promising in biological applications.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gai S., Zhu H., Gao P., Zhou C., Kong Z., Molokeev M. S., Qi Z., Zhou Z., Xia M.
Заглавие : Structure analysis, tuning photoluminescence and enhancing thermal stability on Mn4+-doped La2-xYxMgTiO6 red phosphor for agricultural lighting
Место публикации : Ceram. Int. - 2020. - Vol. 46, Is. 12. - P.20173-20182. - ISSN 02728842 (ISSN), DOI 10.1016/j.ceramint.2020.05.095
Примечания : Cited References: 40. - The authors would like to gratefully acknowledge funds from the National Natural Science Foundation of China (Grant No. 21706060 , 51703061 , 51974123 ), the Hunan Graduate Research and Innovation Project (Grant No. CX2018B396 ), the Hunan provincial Engineering Technology Research Center for Optical Agriculture (Grant No. 2018TP2003 ), the Scientific Research Fund of Hunan Provincial Education Department (15K058, 19C0903), the Natural Sciences Foundation of Hunan agricultural university, China (Grant No. 19QN11), the Science and Technology project of Changsha (KH1801219) and the Huxiang high level talent gathering project (2019RS1077)
Аннотация: Currently, phosphor-converted LEDs (pc-LEDs) are revolutionizing the industry of plant growth lighting. To meet the requirements of this technology, phosphors with tunable photoluminescence, high thermal stability and luminous intensity are required. Herein, we found that the simple substitution of yttrium for lanthanum in La2MgTiO6:Mn4+ (LMT:Mn4+) system could satisfy above three criteria simultaneously. The photoluminescence properties can be regulated by continuously controlling the chemical composition of La2-xYxMgTiO6:Mn4+ solid solution. The La sites are occupied by Y ions, causing a significant blue shift in the emission spectra which owing to the change of local crystal field strengthen. Meanwhile, the thermal stability and decay lifetimes are also varied due to the variation of local structure and band gap energy. The thermal stability of the material reaches 83.5% at 150 °C, which is better than the reported La2MgTiO6:Mn4+ and Y2MgTiO6:Mn4+ phosphors. The electronic luminescence (EL) of pc-LED devices using La2-xYxMgTiO6:Mn4+ red phosphor is evaluated, which matching the absorption regions of plant pigments well, reflecting the superiority of the studied phosphors in plant growth lighting areas.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Xie F., Xu D., Wu Z., Molokeev M. S., Milicevic B., Li H., Shi J.
Заглавие : Improving thermal stability of novel single-component white-light emitting phosphor Ca8MgLu(PO4)7:Tm3+, Dy3+ by back-energy-transfer
Место публикации : J. Lumines. - 2020. - Vol. 227. - Ст.117516. - ISSN 00222313 (ISSN), DOI 10.1016/j.jlumin.2020.117516
Примечания : Cited References: 54. - This work was financially supported by grants from the National Natural Science Foundation of China (No. 21771195 and 51972347), the Natural Science Foundation of Guangdong Province (No. 2016A030313118), the Science and Technology program of Huizhou City (No. 2016X0421036), the Department of Education of Guangdong Province (No. 2018KQNCX249), and the Professorial and Doctoral Scientific Research Foundation of Huizhou University (No. 2018JB012)
Аннотация: The light degradation of WLED devices after long-time use has been proved to be mainly caused by thermal quenching of phosphors, therefore, the design of single-component white-light emitting phosphors with high thermal stability remains a huge challenge. A novel single-phase white light-emitting phosphor Ca8MgLu(PO4)7:Tm3+,Dy3+ was designed and prepared in this work. The photoluminescent results show that white light emission from the phosphor can be achieved by controlling the ratio of Tm3+ and Dy3+ to adjust the relative intensity of the emission at 451 nm of Tm3+ and the emissions at 488, 571 and 660 nm of Dy3+. The luminescence decay results reveal that there is energy transfer from Tm3+ to Dy3+ in Ca8MgLu(PO4)7:Tm3+,Dy3+ and the efficiency of energy transfer between the two dopants reaches as much as 55%. Temperature-dependent luminescent analyses suggest the highly stable emission of Ca8MgLu0.76(PO4)7:0.12Tm3+,0.12Dy3+ as the integrated emission intensity of the phosphor at 475 K reduces only about 13% of that at room temperature, which is due to the back-energy-transfer from highly doped Dy3+ to Tm3+ that compensates the luminescence energy. This single-phase white-light emitting phosphor exhibits superior color and luminescence stability and thus may find a potential application in WLEDs.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Liu, Dongjie, Yun, Xiaohan, Li, Guogang, Dang, Peipei, Molokeev M. S., Lian, Hongzhou, Shang, Mengmeng, Lin, Jun
Заглавие : Enhanced cyan emission and optical tuning of Ca3Ga4O9:Bi3+ for high-quality full-spectrum white light-emitting diodes
Место публикации : Adv. Opt. Mater. - 2020. - Vol. 8, Is. 22. - Ст.2001037. - ISSN 2195-1071, DOI 10.1002/adom.202001037
Примечания : Cited References: 55. - This work was financially supported by the National Natural Science Foundation of China (NSFC No. 51932009, 51720105015, 51672265, 51672266, 51672257 and 51672259), the Key Research Program of Frontier Sciences, CAS (Grant No. YZDY-SSW-JSC018), Science and Technology Cooperation Project between Chinese and Australian Governments (2017YFE0132300), the Jiangmen Innovative Research Team Program (2017), and the Major Program of Basic Research and Applied Research of Guangdong Province (2017KZDXM083)
Предметные рубрики: ENERGY-TRANSFER
TUNABLE LUMINESCENCE
PHOSPHOR
CRYSTAL
MODULATION
Аннотация: Highly efficient cyan‐emitting phosphor materials are indispensable for closing the cyan gap in spectra of the traditional phosphor‐converted white light‐emitting diodes (WLEDs) to achieve high‐quality full‐spectrum white lighting. In this work, bright cyan‐emitting Ca3Ga4O9 (CGO):0.02Bi3+,0.07Zn2+ phosphor is developed to bridge the cyan gap. Such a Bi3+,Zn2+ codoping enhances the cyan emission of CGO:0.02Bi3+ by 4.1 times due to the influence of morphology and size of phosphor particles, charge compensation and lattice distortion. Interestingly, codoping La3+ ions into the current system can achieve a photoluminescence tuning of CGO:0.02Bi3+ from cyan to yellowish‐green by crystallographic site engineering. Besides, Bi3+–Eu3+ energy transfer is successfully realized in CGO:0.02Bi3+,0.07Zn2+,nEu3+ phosphors and the emission color tuning from cyan to orange is observed. The investigation of thermal quenching behaviors reveals that the incorporation of Zn2+ and La3+ improves the thermal stability of CGO:0.02Bi3+. Finally, CGO:0.02Bi3+,0.07Zn2+,0.10Eu3+ phosphor is employed to obtain a single‐phased warm WLED device. A full‐spectrum WLED device with remarkable color rendering index (Ra) of 97.4 and high luminous efficiency of 69.72 lm W−1 is generated by utilizing CGO:0.02Bi3+,0.07Zn2+ phosphor. This result suggests the important effect of CGO:0.02Bi3+,0.07Zn2+ phosphor on closing the cyan gap, providing new insights of cyan‐emitting phosphors applied in full‐spectrum white lighting.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhang, Qiuhong, Li, Junhao, Jiang, Wei, Lin, Litian, Ding, Jianhong, Brik, Mikhail G., Molokeev M. S., Ni, Haiyong, Wu, Mingmei
Заглавие : CaY2Al4SiO12:Ce3+,Mn2+: a single component phosphor to produce high color rendering index WLEDs with a blue chip
Место публикации : J. Mater. Chem. C. - 2021. - Vol. 9, Is. 34. - P.11292-11298. - ISSN 2050-7526, DOI 10.1039/d1tc01770e. - ISSN 2050-7534(eISSN)
Примечания : Cited References: 35. - This work has been financially supported by the National Nature Science Foundation of China (51902063, 51902354, U1801253), the Science and Technology Project of Guangdong Province (2018A050506061), the Science and Technology Project of Guangzhou City (202007020005, 202007020008) and GDAS' Project of Science and Technology Development (2020GDASYL-20200302010, 2018GDASCX-0110). M. G. Brik also thanks the support from the Chongqing Recruitment Program for 100 Overseas Innovative Talents (Grant No. 2015013), the Program for the Foreign Experts (Grant No. W2017011) and Wenfeng High-End Talents Project (Grant No. W2016-01) offered by Chongqing University of Posts and Telecommunications (CQUPT), Estonian Research Council grant PUT PRG111, European Regional Development Fund (TK141) and NCN project 2018/31/B/ST4/00924
Предметные рубрики: GARNET PHOSPHOR
ENERGY-TRANSFER
RED EMISSION
LUMINESCENCE PROPERTIES
Аннотация: A high color rendering index white light emitting diode (WLED) is generally produced by combining yellow and red mixed phosphors on a blue chip. Herein we report a single component phosphor based on CaY2Al4SiO12 (CYAS) to achieve warm white light emission with a high color rendering index (Ra), which can be up to 90.5. Ce3+, Mn2+ singly doped and co-doped CYAS phosphors have been synthesized by solid state reactions, respectively, for comparative investigations. The Rietveld X-ray diffraction (XRD) refinements show that the CYAS host crystallizes in a cubic structure with the Ia[3 with combining macron]d space group. The valence states of Ce and Mn inside the CYAS host have been confirmed by XPS and EPR. Ce3+ occupies the Ca2+/Y3+ site and generates a yellow emission band around 543 nm from its characteristic 5d–4f transition. Mn2+ occupies both the dodecahedron Ca2+/Y3+ and octahedral Al3+ sites, emitting red and deep red lights at 616 nm and 750 nm, respectively. These two emission bands are attributed to the 4T1(4G)–6A1(6S) transitions of Mn2+. Upon 460 nm light excitation, both the Ce3+ and Mn2+ characteristic emissions can be obtained, in which the emissions of Mn2+ result from the occurrence of energy transfer from Ce3+ in CYAS. All the results indicate that the prepared CYAS:Ce3+,Mn2+ could be a promising single component phosphor for blue chip WLEDs.
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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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lai S., Hu T., Molokeev M. S., Xia Z.
Заглавие : Photoluminescence tuning in Ba3ScB3O9:Eu2+ phosphor by crystal-site engineering
Место публикации : Phys. Open. - 2021. - Vol. 8. - Ст.100077. - ISSN 26660326 (ISSN), DOI 10.1016/j.physo.2021.100077
Примечания : Cited References: 31. - The present work was supported by the National Natural Science Foundation of China (Grant Nos. 51972118 and 51961145101), International Cooperation Project of National Key Research and Development Program of China (2021YFE0105700), the 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
Аннотация: Controlled photoluminescence tuning is essential for optimizing and accelerating the application of phosphor materials. Here, we adopt the crystal-site engineering method to tailor the photoluminescence properties in Ba3ScB3O9:Eu2+. Ba3ScB3O9 host contains multiple cationic sites which help to finely regulate Eu2+ site occupancies and thus the emission color. The relationship between Eu2+ emission and the local environments has been analyzed, and we demonstrate that the emission colors of the phosphors can be widely tuned from NIR to yellow by chemically driving the Eu2+ from octahedrally-coordinated Sc3+ sites to nine-fold coordinated Ba2+ sites. Our study will initiate and guide more explorations on discovering new phosphors through crystal-site engineering.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Hu, Tao, Gao, Yan, Molokeev M. S., Xia, Zhiguo, Zhang, Qinyuan
Заглавие : Eu2+ stabilized at octahedrally coordinated Ln3+ site enabling red emission in Sr3LnAl2O7.5 (Ln = Y or Lu) phosphors
Место публикации : Adv. Opt. Mater. - 2021. - Vol. 9, Is. 9. - Ст.2100077. - ISSN 2195-1071, DOI 10.1002/adom.202100077
Примечания : Cited References: 25. - The work was supported from the National Natural Science Foundations of China (Grant Nos. 51972118, 51961145101, and 51722202), the Fundamental Research Funds for the Central Universities (D2190980), the Guangzhou Science & Technology Project (202007020005), and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01x137), and RFBR according to the research project (19-52-80003)
Аннотация: Red spectrum loss in phosphor-converted light-emitting diodes (pc-LEDs) restricts high-quality warm-white lighting. Herein, two blue-light excitable red-emitting Sr3LnAl2O7.5:Eu (Ln = Y or Lu) phosphors are reported, and red emission originating from an unprecedented substitution model, with Eu2+ occupied sixfold octahedrally coordinated lanthanide (Ln3+) sites is demonstrated. Site occupancy identification reveals that three different sites are occupied by Eu2+ and one distinct site is occupied by Eu3+, and the Eu2+ stabilized at Ln3+ site accompanied by Eu3+ selectively occupies at Sr2+ site as a charge compensator. An anomalous prolonged Eu2+-photoluminescence decay emission with increasing temperature in the low-temperature region is demonstrated. This accounts for the trapped electrons, which are thermally released from shallow traps and eventually populate the Eu2+ 5d level to form an excited-state Eu2+. The findings help better understand Eu2+ occupancy and luminescence. These also provide a new perspective for the exploration of novel Eu2+ activated oxide-based red phosphor for pc-LEDs.
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