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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chen K., Gao P., Zhang Z., Ma Y., Luo Z., Molokeev M. S., Zhou Zh., Xia M.
Заглавие : Zero-thermal-quenching broadband yellow-emitting Bi3+-activated phosphors based on metal to metal charge transfer
Колич.характеристики :9 с
Место публикации : J. Alloys Compd. - 2024. - Vol. 986. - Ст.174112. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2024.174112. - ISSN 18734669 (eISSN)
Примечания : Cited References: 52. - 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 and 2022NK2044), the Wangcheng Science and Technology Plan (KJ221017) and 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. Superior Youth Project of the Science Research Project of Hunan Provincial Department of Education (22B0211)
Аннотация: Bi3+-activated phosphors have been proven to have potential applications foreground in white light-emitting diodes (WLED), plant growth lamps and temperature sensing. Therefore, it is urgent to exploit high-efficiency Bi3+-activated phosphors. Herein, a novel broadband yellow-emitting phosphor Ba2GdGaO5:Bi3+ with high internal quantum efficiency (IQE = 77%) was obtained based on metal to metal charge transfer (MMCT) between Bi3+ ground state and Gd3+ excited states. The photoluminescence excitation (PLE) spectrum and photoluminescence (PL) spectrum range from 225 nm to 400 nm and 400 nm to 700 nm, respectively, which can avoid the reabsorption phenomenon efficiently. Besides, Ba2GdGaO5:Bi3+ has superior thermal stability and it shows zero-thermal-quenching at 150 °C. The K+ doping hardly changes the thermal stability and can improve the PL intensity to 133.1% when the K+ concentration is 2%. Finally, a phosphor-convert WLED (pc-WLED) was simply synthesized by Ba2GdGaO5:Bi3+ and BaMgAl10O17:Eu2+ (BAM:Eu2+) phosphors. The doping of Eu3+ can significantly enhance the color rendering index (CRI, from 88.1 to 91.5) and reduce the correlated color temperature (CCT, from 4911 K to 4014 K). The above experimental results demonstrated that the phosphor has great application prospect in WLED.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lim, Chang S., Aleksandrovsky A. S., Molokeev M. S., Oreshonkov A. S., Atuchin V.
Заглавие : Structural and spectroscopic effects of Li+ substitution for Na+ in LixNa1–xCaLa0.5Er0.05Yb0.45(MoO4)3 upconversion scheelite-type phosphors
Место публикации : Crystals. - 2023. - Vol. 13, Is. 2. - Ст.362. - ISSN 20734352 (eISSN), DOI 10.3390/cryst13020362
Примечания : Cited References: 63. - This study was funded by the Research Program through the Campus Research Foundation funded by Hanseo University in 2022 (2022046)
Аннотация: New triple molybdates LixNa1−xCaLa0.5(MoO4)3:Er3+0.05/Yb3+0.45 (x = 0, 0.05, 0.1, 0.2, 0.3) were manufactured successfully using the microwave-assisted sol-gel-based technique (MAS). Their room-temperature crystal structures were determined in space group I41/a by Rietveld analysis. The compounds were found to have a scheelite-type structure. In Li-substituted samples, the sites of big cations were occupied by a mixture of (Li, Na, La, Er, Yb) ions, which provided a linear cell volume decrease with the Li content increase. The increased upconversion (UC) efficiency and Raman spectroscopic properties of the phosphors were discussed in detail. The mechanism of optimization of upconversion luminescence upon Li content variation was shown to be due to the control of excitation/energy transfer channel, while the control of luminescence channels played a minor role. The UC luminescence maximized at lithium content x = 0.05. The mechanism of UC optimization was shown to be due to the control of excitation/energy transfer channel, while the control of luminescence channels played a minor role. Over the whole spectral range, the Raman spectra of LixNa1−xCaLa0.5(MoO4)3 doped with Er3+ and Yb3+ ions were totally superimposed with the luminescence signal of Er3+ ions, and increasing the Li+ content resulted in the difference of Er3+ multiple intensity. The density functional theory calculations with the account for the structural disorder in the system of Li, Na, Ca, La, Er and Yb ions revealed the bandgap variation from 3.99 to 4.137 eV due to the changing of Li content. It was found that the direct electronic transition energy was close to the indirect one for all compounds. The determined chromaticity points (ICP) of the LiNaCaLa(MoO4)3:Er3+,Yb3+ phosphors were in good relation to the equal-energy point in the standard CIE (Commission Internationale de L’Eclairage) coordinates.
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Вид документа : Статья из журнала
Шифр издания :
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
Шифр издания :
Автор(ы) : Liu, Shuifu, Wen, Dawei, Du, Rongkai, Jiang, Chunyan, Chen, Jun, Li, Junhao, Zhou, Lei, Molokeev M. S., Wu, Mingmei
Заглавие : Site-engineering for controlling multiple-excitation and emission in Eu2+-activated CaSrSiO4 phosphors in marine fisheries
Место публикации : Adv. Optical Mater. - 2023. - Vol. 11, Is. 10. - Ст.2203151. - ISSN 21951071 (eISSN), DOI 10.1002/adom.202203151
Примечания : Cited References: 19. - This work was financially supported by grants from the National Natural Science Foundation of China (NSFC, no. 51902355, and 52002411) and its joint project with Yunnan (no. U1702254) and Guangdong (no. U1801253) Provinces, and the GDAS’ Project of Science and Technology Development (no. 2022GDASZH-2022010104). The authors are grateful to Prof. Ru-shi Liu for the in-depth communication and valuable advice on the improvement of the manuscript
Аннотация: Artificial light fishing technology has been used in marine fisheries for thousands of years. The light source with multi-color adjustable output is expected to become a new generation of fish-attracting lamps. Herein, a new method of crystal-site engineering through reducing atmospheres is proposed for the development of Eu2+ doped single-phase phosphor with multi-excitation and multi-emission properties. Following this approach, the distribution ratio of Eu2+ at Ca2+ and Sr2+ sites in CaSrSiO4 (CSO) can be modulated. Importantly, Eu2+ at both lattice sites exhibit non-interfering optical properties, CSO:Eu2+ phosphor realizes multi-color output from green to yellow and then to red when Eu2+ occupies the Sr2+ and Ca2+ sites in a relatively balanced ratio. Benefitting from the tunable color range covering the spectral sensitivity regions of most marine fishes, this phosphor may eventually be applied in futuristic innovative fish-attracting lamps.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chen, Yu, Yang, Zhiyu, Jin, Jiance, Qiao, Jianwei, Wang, Yuzhen, Molokeev M. S., Swart, Hendrik C., Xia, Zhiguo
Заглавие : Site occupation engineering toward giant red-shifted photoluminescence in (Ba,Sr)2LaGaO5:Eu2+ phosphors
Колич.характеристики :8 с
Место публикации : Chem. Mater. - 2023. - Vol. 35, Is. 20. - P.8714-8721. - ISSN 08974756 (ISSN), DOI 10.1021/acs.chemmater.3c01980. - ISSN 15205002 (eISSN)
Примечания : Cited References: 35. - This research was supported by the National Key Research and Development Program of China (2021YFB3500401 and 2021YFE0105700), the National Natural Science Foundations of China (Grant Nos. 51972118 and 52102169), the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01X137), the China Postdoctoral Science Foundation (2021M691053), and the Young Elite Scientists Sponsorship Program by China Association for Science and Technology (No. YESS20200053). This work was also 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. 075-15-2022-314
Аннотация: Exploring oxide-based red-emitting phosphors is essential for improving the color rendering index (Ra) and reducing the correlated color temperature (CCT) of white-light-emitting diode (LED) lighting sources. Especially, it is challenging to design Eu2+ red emission in inorganic solids. Here, the Eu2+-activated oxide phosphor Sr2LaGaO5:Eu2+ was synthesized with red emission peaking at 618 nm under 450 nm excitation. The crystal structure and spectral analysis indicate that Eu2+ tends to occupy [Sr1/LaO8] polyhedrons with a smaller coordination number, resulting in a large crystal field splitting at the 5d level and realizing the broadband 4f–5d red emission. When Sr is substituted by Ba atoms, density functional theory calculations verify that Ba tends to enter [Sr2O10] with a large coordination number, further giving rise to the lattice distortion and a giant spectral redshift (618–800 nm). The white LED device fabricated by mixing red Sr1.8Ba0.2GaO5:Eu2+ and green Lu3Al5O12:Ce3+ phosphors exhibits a high color rendering index (Ra = 92.1) and a low color-dependent temperature (CCT = 4570 K). This study will give guidance for exploring new Eu2+ activated oxide-based red phosphors as well as achieving tunable emission through cations’ substitution.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ming, Hong, Zhao, Yifei, Zhou, Yayun, Molokeev M. S., Wang, Yuanjing, Song, Enhai, Zhang, Qinyuan
Заглавие : Chemical group substitution enables highly efficient Mn4+ luminescence in heterovalent systems
Место публикации : Adv. Optical Mater. - 2023. - Vol. 11, Is. 10. - Ст.2300076. - ISSN 21951071 (eISSN), DOI 10.1002/adom.202300076
Примечания : Cited References: 36. - This work was financially supported by the National Key Research and Development Program of China (2022YFB3503800), the National Science Foundation of China (Grant Nos. 52202170 and 51972117). This work was also funded by RFBR according to the research project No. 19-52-80003
Аннотация: Defects are a double-edged sword for heterovalent metal-ion doping phosphors. Along with the luminescence tunability of phosphors bestowed by defects, their expected luminescence efficiency would also be inevitably lowered due to the presence of these quenching sites. Herein, a chemical group substitution strategy is proposed, where inorganic polyhedrons act as the smallest chemical units during the structural evolution of the doping process. Such a method can not only effectively prevent the defect generation for charge compensation in heterovalent doping systems, but also facilitate the incorporation of activators into the matrix, leading to extremely high luminescence efficiency. The concept is first confirmed energetically favorable by first-principles simulations. As a robust experimental proof, two newly reported Mn4+-incorporated hexavalent organic-inorganic hybrid oxyfluorides (TMA)2BO2F4:Mn4+ (where TMA stands for tetramethylammonium, and B = W6+ or Mo6+) present high quantum efficiency (up to 94.4%) and short lifetime (down to 2.26 ms) that are superior to the commercial red phosphor K2SiF6:Mn4+ (≈84.8%, ≈8.06 ms). Utilizing the differences in decay lifetimes and thermal quenching behaviors of (TMA)2BO2F4:Mn4+ and K2SiF6:Mn4+, a time- and temperature-resolved single-color multiplexing mode with high-safety and easy-access is developed for information security. This work offers an effective strategy to manipulate defect generation in luminescent materials.
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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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Вид документа : Статья из журнала
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Автор(ы) : Liu D., Li G., Dang P., Zhang Q., Wei Y., Qiu L., Molokeev M. S., Lian H., Shang M., Lin J.
Заглавие : Highly efficient Fe3+-doped A2 BB′O6 (A = Sr2+, Ca2+; B, B′ = In3+, Sb5+, Sn4+) broadband near-infrared-emitting phosphors for spectroscopic analysis
Место публикации : Light Sci. Appl. - 2022. - Vol. 11, Is. 1. - Ст.112. - ISSN 20955545 (ISSN), DOI 10.1038/s41377-022-00803-x
Примечания : Cited References: 50. - This work was financially supported by the National Natural Science Foundation of China (NSFC Nos. 51720105015, 51932009, 51929201, 52072349), the Projects for Science and Technology Development Plan of Jilin Province (20210402046GH), and the Natural Science Foundation of Zhejiang Province (LR22E020004)
Предметные рубрики: Optical properties of diamond
Inorganic LEDs
Аннотация: Near-infrared (NIR)-emitting phosphor-converted light-emitting diodes have attracted widespread attention in various applications based on NIR spectroscopy. Except for typical Cr3+-activated NIR-emitting phosphors, next-generation Cr3+-free NIR-emitting phosphors with high efficiency and tunable optical properties are highly desired to enrich the types of NIR luminescent materials for different application fields. Here, we report the Fe3+-activated Sr2−yCay(InSb)1−zSn2zO6 phosphors that exhibit unprecedented long-wavelength NIR emission. The overall emission tuning from 885 to 1005 nm with broadened full-width at half maximum from 108 to 146 nm was realized through a crystallographic site engineering strategy. The NIR emission was significantly enhanced after complete Ca2+ incorporation owing to the substitution-induced lower symmetry of the Fe3+ sites. The Ca2InSbO6:Fe3+ phosphor peaking at 935 nm showed an ultra-high internal quantum efficiency of 87%. The as-synthesized emission-tunable phosphors demonstrated great potential for NIR spectroscopy detection. This work initiates the development of efficient Fe3+-activated broadband NIR-emitting phosphors and opens up a new avenue for designing NIR-emitting phosphor materials.
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Вид документа : Статья из журнала
Шифр издания :
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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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yang, Zhiyu, Liu, Gaochao, Zhao, Yifei, Zhou, Yayun, Qiao, Jianwei, Molokeev M. S., Swart, Hendrik C., Xia, Zhiguo
Заглавие : Competitive site occupation toward improved quantum efficiency of SrLaScO4:Eu red phosphors for warm white LEDs
Коллективы : International Cooperation Project of 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]; State Key Laboratory of Luminescent Materials and Devices [Skllmd-2021-09]; China Postdoctoral Science FoundationChina Postdoctoral Science Foundation [2021M691053]; Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01X137]; RFBRRussian Foundation for Basic Research (RFBR) [19-52-80003]; NRF International: SA/China Joint Research Programme 2021 [CHIN2002265 06921 UID 132785]
Место публикации : Adv. Opt. Mater. - 2022. - Vol. 10. Is. 6. - Ст.2102373. - ISSN 2195-1071, DOI 10.1002/adom.202102373
Примечания : Cited References: 42. - This research was supported by the International Cooperation Project of National Key Research and Development Program of China (Program No. 2021YFE0105700), National Natural Science Foundation of China (Grant Nos. 51972118 and 51961145101), Guangzhou Science & Technology Project (Project No. 202007020005), the State Key Laboratory of Luminescent Materials and Devices (Grant No. Skllmd-2021-09), China Postdoctoral Science Foundation (Grant No. 2021M691053), and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (Program No. 2017BT01X137). This work was also funded by RFBR according to the research Project No. 19-52-80003 and the NRF International: SA/China Joint Research Programme 2021 - CHIN2002265 06921 UID 132785
Предметные рубрики: LUMINESCENCE
EUROPIUM
BLUE
EU2+
STABILIZATION
EPR
Аннотация: The discovery of Eu2+-doped high-efficiency red phosphors remains a vital challenge for white light-emitting diode (WLED) applications. It is therefore urgent to find effective strategies managing the oxidation state to help reduce Eu3+ to Eu2+ and accordingly increase the photoluminescence quantum yield (PLQY). Herein, a new red-emitting SrLaScO4:Eu phosphor is designed, and the PLQY is enhanced from 13% to 67% under 450 nm excitation by employing (NH4)2SO4-assisted sintering. Combined structural analysis, optical spectroscopy, and theoretical calculation reveal that predominant Eu2+ prefers to occupy the Sr2+ sites in the SrLaScO4 enabling red emission, and a competitive site occupation of Eu3+ in La3+ can be restrained, and the reduction mechanism of Eu3+ to Eu2+ originating from the (NH4)2SO4 addition is analyzed. The fabricated WLED device using red-emitting SrLaScO4:Eu and yellow-emitting Y3(Al,Ga)5O12:Ce3+ exhibits a high color-rendering index of 86.7 at a low correlated color temperature of 4005 K. This work provides a feasible reduction strategy for guiding the development of high-efficiency Eu2+-doped red phosphor for WLED applications.
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