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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Qiao J., Amachraa M., Molokeev M. S., Chuang Y. -C., Ong S. P., Zhang Q., Xia Z.
Заглавие : Engineering of K3YSi2O7 to Tune Photoluminescence with Selected Activators and Site Occupancy
Место публикации : Chem. Mater. - 2019. - Vol. 31, Is. 18. - P.7770-7778. - ISSN 08974756 (ISSN), DOI 10.1021/acs.chemmater.9b02990
Примечания : Cited References: 48. - This work was supported by the National Natural Science Foundation of China (Nos. 51722202, 51972118 and 51572023), Natural Science Foundations of Beijing (2172036), Fundamental Research Funds for the Central Universities (FRF-TP-18-002C1), and Guangdong Provincial Science & Technology Project (2018A050506004). This work was also supported by the National Science Foundation, Ceramics Program (No. 1911372), and the computational resources were provided by the Extreme Science and Engineering Discovery Environment (XSEDE) supported by the National Science Foundation (No. ACI-1548562).
Аннотация: The luminescence of rare earth ions (Eu2+, Ce3+, and Eu3+)-doped inorganic solids is attractive for the screening of phosphors applied in solid-state lighting and displays and significant to probe the occupied crystallographic sites in the lattice also offering new routes to photoluminescence tuning. Here, we report on the discovery of the Eu- and Ce-activated K3YSi2O7 phosphors. K3YSi2O7:Eu is effectively excited by 450 nm InGaN blue light-emitting diodes (LEDs) and displays an orange-red emission originated from characteristic transitions of both Eu2+ and Eu3+, while K3YSi2O7:Ce3+ shows green emission upon 394 nm near-ultraviolet (NUV) light excitation. Rietveld refinement verifies the successful doping of the activators, and density functional theory (DFT) calculations further support that Eu2+ occupies both K1 and Y2 crystallographic sites, while Ce3+ and Eu3+ only occupy the Y2 site; hence, the broad-band red emission of Eu2+ are attributed to a small DFT band gap (3.69 eV) of K3YSi2O7 host and a selective occupancy of Eu2+ in a highly distorted K1 site and a high crystal field splitting around Y2 sites. The white LEDs device utilizing orange-red-emitting K3YSi2O7:Eu and green-emitting K3YSi2O7:Ce3+ exhibits an excellent CRI of 90.1 at a correlated color temperature of 4523 K. Our work aims at bridging multivalent Eu2+/Eu3+ and Ce3+ site occupancy in the same host to realize photoluminescence tuning and especially exposes new ways to explore new phosphors with multicolor emission pumped by blue and NUV light for white LEDs.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lim, Chang Sung, Aleksandrovsky A. S., Atuchin V. V., Molokeev M. S., Oreshonkov A. S.
Заглавие : Microwave sol-gel synthesis, microstructural and spectroscopic properties of scheelite-type ternary molybdate upconversion phosphor NaPbLa(MoO4)3:Er3+/Yb3+
Место публикации : J. Alloys Compd. - 2020. - Vol. 826. - Ст.152095. - ISSN 0925-8388 (ISSN), DOI 10.1016/j.jallcom.2019.152095. - ISSN 1873-4669 (eISSN)
Примечания : Cited References: 53. - This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (2018R1D1A1A09082321). This study was supported by the Russian Science Foundation (19-42-02003, in part of conceptualization). Also, this study was supported by RFBR (18-32-20011, 18-03-00750).
Аннотация: New ternary molybdate NaPbLa(1-x-y)(MoO4)3:xEr3+,yYb3+ (x = y = 0, x = 0.05 and y = 0.35, 0.4, 0.45 and 0.5) phosphors were successfully fabricated by the MSG (microwave sol-gel) method, and the microstructural and spectroscopic properties were characterized. The crystal structure of NaPbLa(MoO4)3 (NPLM) was defined by Rietveld analysis in space group I41/a with unit cell parameters a = 5.3735(2) and c = 11.8668(4) Å, V = 342.65(3) Å3, Z = 4 (RB = 6.64%). The unit cell volume of NaPbLa(MoO4)3 (NPLM) was intermediate between those of NaLa(MoO4)2 and PbMoO4. Under the 980 nm excitation, upconverted yellowish-green emissions at transitions from 2H11/2 and 4S3/2 were observed. No concentration quenching in the subsystem of donor ions at the content up to 50 at.% and no cross-relaxation losses in the subsystem of acceptor ions at the concentrations as high as 5 at. % were verified. The individual chromaticity points for the NaPbLa(MoO4)3:Er3+,Yb3+ phosphors, corresponding to the equal-energy point in the standard CIE diagram, revealed yellowish-green emissions.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Qiao, Jianwei, Ning, Lixin, Molokeev M. S., Chuang, Yu-Chun, Zhang, Qinyuan, Poeppelmeier, Kenneth R., Xia, Zhiguo
Заглавие : Site-Selective Occupancy of Eu2+ Toward Blue-Light-Excited Red Emission in a Rb3YSi2O7:Eu Phosphor
Место публикации : Angew. Chem. - 2019. - Vol. 131, Is. 33. - P.11645-11650. - ISSN 1521-3757, DOI 10.1002/ange.201905787
Примечания : Cited References: 41. - This work is supported by the National Natural Science Foundation of China (51722202, 51572023, and 11574003), Natural Science Foundations of Beijing (2172036), Fundamental Research Funds for the Central Universities (FRF-TP-18-002C1), and the Guangdong Provincial Science & Technology Project (2018A050506004). K.R.P. recognizes that this work was made possible by support from the National Science Foundation, Solid State Materials Chemistry award DMR-1608218.
Предметные рубрики: LUMINESCENCE PROPERTIES
CE3+
ENERGY
PHOTOLUMINESCENCE
TRANSITION
Аннотация: Establishing an effective design principle in solid-state materials for a blue-light-excited Eu2+-doped red-emitting oxide-based phosphors remains one of the significant challenges for white light-emitting diodes (WLEDs). Selective occupation of Eu2+ in inorganic polyhedra with small coordination numbers results in broad-band red emission as a result of enhanced crystal-field splitting of 5d levels. Rb3YSi2O7:Eu exhibits a broad emission band at λmax=622 nm under 450 nm excitation, and structural analysis and DFT calculations support the concept that Eu2+ ions preferably occupy RbO6 and YO6 polyhedra and show the characteristic red emission band of Eu2+. The excellent thermal quenching resistance, high color-rendering index Ra (93), and low CCT (4013 K) of the WLEDs clearly demonstrate that site engineering of rare-earth phosphors is an effective strategy to target tailored optical performance.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fang M. -H., Mahlik S., Lazarowska A., Grinberg M., Molokeev M. S., Sheu H. -S., Lee J. -F., Liu R. -S.
Заглавие : Structural Evolution and Effect of the Neighboring Cation on the Photoluminescence of Sr(LiAl3)1−x(SiMg3)xN4:Eu2+ Phosphors
Место публикации : Angew. Chem. Int. Ed. - 2019. - Vol. 58, Is. 23. - P.7767-7772. - ISSN 14337851 (ISSN), DOI 10.1002/anie.201903178
Примечания : Cited References: 23. - This work was supported by the Ministry of Science and Technology of Taiwan (Contract Nos. MOST 107‐2113‐M‐002‐008‐MY3 and MOST 107–2923‐M‐002‐004‐MY3). This work was supported by the National Science Centre Poland grant Opus no. 2016/23/B/ST3/03911 and the National Centre for Research and Development Poland Grant (No. PL‐TW/V/1/2018).
Предметные рубрики: Solid-Solution Phosphors
Аннотация: In this study, a series of Sr(LiAl3)1−x(SiMg3)xN4:Eu2+ (SLA‐SSM) phosphors were synthesized by a solid‐solution process. The emission peak maxima of SLA‐SSM range from 615 nm to 680 nm, which indicates structural differences in these materials. 7Li solid‐state NMR spectroscopy was utilized to distinguish between the Li(1)N4 and Li(2)N4 tetrahedra in SLA‐SSM. Differences in the coordination environments of the two Sr sites were found which explain the unexpected luminescent properties. Three discernible morphologies were detected by scanning electron microscopy. Temperature‐dependent photoluminescence and decay times were used to understand the diverse environments of europium ions in the two strontium sites Sr1 and Sr2, which also support the NMR analysis. Moreover, X‐ray absorption near‐edge structure studies reveal that the Eu2+ concentration in SLA‐SSM is much higher than that in in SrLiAl3N4:Eu2+ and SrSiMg3N4:Eu2+ phosphors. Finally, an overall mechanism was proposed to explain the how the change in photoluminescence is controlled by the size of the coordinated cation.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Qiao, Jianwei, Ning, Lixin, Molokeev M. S., Chuang, Yu-Chun, Zhang, Qinyuan, Poeppelmeier, Kenneth R., Xia, Zhiguo
Заглавие : Site-Selective Occupancy of Eu2+ Toward Blue-Light-Excited Red Emission in a Rb3YSi2O7:Eu Phosphor
Место публикации : Angew. Chem. Int. Edit. - 2019. - Vol. 58, Is. 33. - P.11521-11526. - ISSN 1433-7851, DOI 10.1002/anie.201905787. - ISSN 1521-3773(eISSN)
Примечания : Cited References: 41. - This work is supported by the National Natural Science Foundation of China (51722202, 51572023, and 11574003), Natural Science Foundations of Beijing (2172036), Fundamental Research Funds for the Central Universities (FRF-TP-18-002C1), and the Guangdong Provincial Science & Technology Project (2018A050506004). K.R.P. recognizes that this work was made possible by support from the National Science Foundation, Solid State Materials Chemistry award DMR-1608218.
Предметные рубрики: LUMINESCENCE PROPERTIES
CE3+
ENERGY
PHOTOLUMINESCENCE
TRANSITION
Аннотация: Establishing an effective design principle in solid-state materials for a blue-light-excited Eu2+-doped red-emitting oxide-based phosphors remains one of the significant challenges for white light-emitting diodes (WLEDs). Selective occupation of Eu2+ in inorganic polyhedra with small coordination numbers results in broad-band red emission as a result of enhanced crystal-field splitting of 5d levels. Rb3YSi2O7:Eu exhibits a broad emission band at λmax=622 nm under 450 nm excitation, and structural analysis and DFT calculations support the concept that Eu2+ ions preferably occupy RbO6 and YO6 polyhedra and show the characteristic red emission band of Eu2+. The excellent thermal quenching resistance, high color-rendering index Ra (93), and low CCT (4013 K) of the WLEDs clearly demonstrate that site engineering of rare-earth phosphors is an effective strategy to target tailored optical performance.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Liao H., Zhao M., Zhou Y., Molokeev M. S., Liu Q., Zhang Q., Xia Z.
Заглавие : Polyhedron Transformation toward Stable Narrow-Band Green Phosphors for Wide-Color-Gamut Liquid Crystal Display
Место публикации : Adv. Funct. Mater. - 2019. - Vol. 29, Is. 30. - Ст.1901988. - ISSN 1616301X (ISSN) , DOI 10.1002/adfm.201901988
Примечания : Cited References: 34. - The present work was supported by the National Natural Science Foundations of China (Grant Nos. 51722202, 91622125, and 51572023), Natural Science Foundations of Beijing (2172036), Fundamental Research Funds for the Central Universities (FRF‐TP‐18‐002C1), and the Guangdong Provincial Science & Technology Project (No. 2018A050506004).
Аннотация: A robust and stable narrow-band green emitter is recognized as a key enabler for wide-color-gamut liquid crystal display (LCD) backlights. Herein, an emerging rare earth silicate phosphor, RbNa(Li3SiO4)2:Eu2+ (RN:Eu2+) with exceptional optical properties and excellent thermal stability, is reported. The resulting RN:Eu2+ phosphor presents a narrow green emission band centered at 523 nm with a full width at half maximum of 41 nm and excellent thermal stability (102%@425 K of the integrated emission intensity at 300 K). RN:Eu2+ also shows a high quantum efficiency, an improved chemical stability, and a reduced Stokes shift owing to the modified local environment, in which [NaO8] cubes replace [LiO4] squares in RbLi(Li3SiO4)2:Eu2+ via polyhedron transformation. White light-emitting diode (wLED) devices with a wide color gamut (113% National Television System Committee (NTSC)) and high luminous efficacy (111.08 lm W−1) are obtained by combining RN:Eu2+ as the green emitter, K2SiF6:Mn4+ as the red emitter, and blue-emitting InGaN chips. Using these wLEDs as backlights, a prototype 20.5 in. LCD screen is fabricated, demonstrating the bright future of stable RN:Eu2+ for wide-color-gamut LCD backlight application.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Cheng C., Ning L., Ke X., Molokeev M. S., Wang Z., Zhou G., Chuang Y. -C., Xia Z.
Заглавие : Designing high-performance LED phosphors by controlling the phase stability via a heterovalent substitution strategy
Место публикации : Adv. Opt. Mater. - 2020. - Vol. 8, Is. 2. - Ст.1901608. - ISSN 21951071 (ISSN), DOI 10.1002/adom.201901608
Примечания : Cited References: 31
Аннотация: Phosphor-converted white light-emitting diodes (LEDs) are currently playing key roles in the lighting and display industries and trigger urgent demands for the discovery of “good” phosphors with high quantum efficiency, improved thermal stability, and controllable excitation/emission properties. Herein, a general and efficient heterovalent substitution strategy is demonstrated in K2HfSi3O9:Eu2+ achieved by Ln3+ (Ln = Gd, Tb, Dy, Tm, Yb, and Lu) doping to optimize luminescence properties, and as an example, the Lu3+ substitution leads to improvement of emission intensity and thermal stability, as well as tunable emission color from blue to cyan. The structural stability and Eu2+ occupation via Lu3+ doping have been revealed by the structural elaboration and density functional theory calculations, respectively. It is shown that heterovalent substitution allows predictive control of site preference of luminescent centers and therefore provides a new method to optimize the solid-state phosphors for LEDs.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lim, Chang Sung, Atuchin V. V., Aleksandrovsky A. S., Denisenko, Yuriy G., Molokeev M. S., Oreshonkov A. S.
Заглавие : Erratum to: fabrication of microcrystalline NaPbLa(WO4)3:Yb3+/Ho3+ phosphors and their upconversion photoluminescent characteristics (vol 29, pg 741, 2019)
Коллективы : Campus Research Foundation - Hanseo University [191Yunghap09]
Место публикации : Kor. J. Mater. Res. - 2020. - Vol. 30, Is. 1. - P.50. - ISSN 1225-0562, DOI 10.3740/MRSK.2020.30.1.50. - ISSN 2287-7258(eISSN)
Примечания : Cited References: 1. - This study was supported by the Research Program through the Campus Research Foundation funded by Hanseo University in 2019 (191Yunghap09).
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lai S., Zhao M., Qiao J., Molokeev M. S., Xia Z.
Заглавие : Data-driven photoluminescence tuning in Eu2+-doped phosphors
Место публикации : J. Phys. Chem. Lett. - 2020. - Vol. 11, Is. 14. - P.5680-5685. - ISSN 19487185 (ISSN), DOI 10.1021/acs.jpclett.0c01471
Примечания : Cited References: 34. - 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), Guangzhou Science & Technology Project (202007020005), 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: Phosphors
Luminescence properties
Crystal structure
Ions
Quantum mechanics
Аннотация: Discovery of rare earth phosphors has generally relied on the chemical intuition and time-intensive trial-and-error synthesis; therefore, finding new materials assisted by data-driven computations is urgent. Herein, we utilize a regression model to predict the emission wavelengths of Eu2+-doped phosphors by revealing the relationships between the crystal structure and luminescence property. The emission wavelengths of [Rb(1–x)K(x)]3LuSi2O7:Eu2+ (0 ≤ x ≤ 1) phosphors, as examples for the data-driven photoluminescence tuning, are successfully predicted on the basis of the existing data of only eight systems, also consistent with the experimental results. These phosphors can be excited by blue light and exhibit broad-band red and near-infrared emission ranging from 619 to 737 nm. These findings in Eu2+-doped silicate phosphors indicate that data-driven computations through the regression mode would have bright application in discovering novel phosphors with a target emission wavelengths.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Wei, Y.i., Yang, Hang, Gao, Zhiyu, Xing, Gongcheng, Molokeev M. S., Li, Guogang
Заглавие : Bismuth activated full spectral double perovskite luminescence materials by excitation and valence control for future intelligent LED lighting
Место публикации : Chem. Commun. - 2020. - Vol. 56, Is. 64. - P.9170-9173. - ISSN 1359-7345, DOI 10.1039/d0cc03975f. - ISSN 1364-548X(eISSN)
Примечания : Cited References: 27. - This work was supported by the National Natural Science Foundation of China (Grant No. 51672259) and the Fundamental Research Funds for the National Universities, China University of Geosciences (Wuhan) (No. 1910491T02)
Предметные рубрики: PHOTOLUMINESCENCE
PHOSPHORS
Bi3+
MODULATION
CRYSTAL
Аннотация: A novel La2Mg1.14Zr0.86O6:Bi3+ double perovskite phosphor with excitation-induced blue/green photoluminescence tuning is reported. By designing Bi3+ → Eu3+ energy transfer, single-composition white light with wide-scale adjustable corrected color temperatures (CCTs) is successfully achieved. This work initiates a new insight to explore phosphors with excitation-induced photoluminescence tuning and wide CCT control for future intelligent LED lighting.
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