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Synthesis,structure and NIR luminescence properties of Yb^3+ and Bi^3+-activated vanadate GdVO4

Journal of Rare Earths 2016年第8期34卷 837-842页

作者： K.Lenczewska M.Stefanski D.Hreniak Institute of Low Temperature and Structural Research Polish Academy of SciencesOkolna 250-422 WroclawPoland

near-infrared emission of Yb3＋ and Bi3＋-co-doped GdVO4 vanadate phosphors obtained via the modified Pechini＇s method was reported. The phase purity and structure of samples were characterized by X-ray powder diN＇action （XRD）, X-ray energy disper- sion spectroscopy （EDS）, scanning electron microscopy （SEM）, Raman and infrared （IR） spectroscopy. Photoluminescence emission （PL） and excitation （PLE） spectra were recorded and investigated in details. Results indicated that upon near-UV excitation （340 nm） in the （Bi3＋-V5＋） charge transfer state this phosphor had a strong broad band yellow-green emission （3Pi--ISo） of Bi3＋ ions and also NIR emission （2Fs/2-2Fv/2） of Yb3＋ ions in the range of 950-1050 nm, which matched well with the spectral response of the sili- con-based solar cells. The decreasing Bi3＋ emission with increasing Yb3＋ concentration proved the occurrence of energy transfer from Bi3＋ to Yb3＋ ions. Results demonstrated that Yb3＋ and Bi3＋-co-doped GdVO4 vanadate phosphors might act as a NIR down-conversion （DC） solar spectral converter to enhance the efficiency of the silicon-based solar cells.

关键词： near-infrared phosphor vanadates energy transfer rare earths

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Achieving broadband near-infrared luminescence in Cr^(3+)-Activated Y_(2)Mg_(2)Al_(2)Si_(2)O_(12)phosphors via multi-site occupancy

Advanced Powder Materials

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Advanced Powder Materials 2024年第3期3卷 68-76页

作者： Gui-Hua Li Han-Qi Wei Qi-Hua Yang Zhi-Wei Luo Ge-Mei Cai Li Ma Xiao-Jun Wang School of Materials Science and Engineering Central South UniversityChangsha 410083China Science Center for Phase Diagram&Materials Design and Manufacture Central South UniversityChangsha 410083China Department of Physics Georgia Southern UniversityStatesboroGA 30460United States

Cr^(3+)-activated near-infrared(NIR)phosphors are key for NIR phosphor-converted light emitting diodes(NIR pc-LED).While,the site occupancy of Cr^(3+)is one of the debates that have plagued ***,Y2Mg2Al2-Si_(2)O1_(2)(YMAS)with multiple cationic sites is chosen as host of Cr^(3+)to synthesize YMAS:xCr^(3+)*** YMAS,Cr^(3+)ions occupy simultaneously Al/SiO4 tetrahedral,Mg/AlO6 octahedral,and Y/MgO8 dodecahedral sites which form three luminescent centers named as Cr1,Cr2,and Cr3,***1 and Cr2 relate to an intermediate crystal field,with transitions of^(2)E→^(4)A_(2)and^(4)T_(2)→^(4)A_(2)occurring *** Cr^(3+)concentration increases,the^(4)T_(2)→^(4)A_(2)transition becomes more pronounced in Cr1 and Cr2,resulting in a red-shift and broadband ***3 consistently behaves a weak crystal field and exhibits the broad and long-wavelength ***-range NIR emission centering at 745 nm is realized in YMAS:0.03Cr^(3+)*** phosphor has high internal quantum efficiency(IQE?86%)and satisfying luminescence thermal stability(I423 K?70.2%).Using this phosphor,NIR pc-LEDs with 56.6 mW@320 mA optical output power is packaged and *** study not only demonstrates the Cr^(3+)multi-site occupancy in a certain oxide but also provides a reliable approach via choosing a host with diverse cationic sites and local environments for Cr^(3+)to achieve broadband NIR phosphors.

关键词： near-infrared phosphor pc-LEDs Cr^(3+) Broadband emission Site occupancy Crystal field

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