Structural and optical behavior of nano-scaled luminous green-emitting Ca9Y(PO4)7:Tb3+ phosphor for competent lighting devices

被引：26
作者：
Siwach, Anju [1 ]
Kumar, Dinesh [1 ]
机构：
[1] Deenbandhu Chhotu Ram Univ Sci & Technol, Dept Chem, Murthal 131039, Sonepat, India
来源：
CHEMICAL PHYSICS LETTERS | 2021年 / 772卷
关键词：
Solution-combustion; Rietveld study; Space symmetry; Band-gap; CIE chromaticity co-ordinates; Quantum efficiency; ENERGY-TRANSFER; HIGH-BRIGHTNESS; PHOTOLUMINESCENCE PROPERTIES; LUMINESCENCE PROPERTIES; EU3+ NANOPHOSPHOR; RED PHOSPHOR; EMISSION; EFFICIENCY; CRYSTAL;
D O I：
10.1016/j.cplett.2021.138547
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Nano-sized Ca9Y(1-x)(PO4)(7):xTb(3+) phosphor series was synthesized via solution-combustion method for the first time. Rietveld study revealed the incorporation of Tb3+ ions into monoclinic host lattice of R3c(161) space symmetry. The diffuse reflectance spectral investigations depicted the lowering of band-gap (E-g) value from 4.44 to 4.27 eV for Ca9Y(PO4)(7) and Ca9Y0.30Tb0.70(PO4)(7), respectively. Under near-Ultraviolet excitation, PL spectra yielded luminous green emission at 544 nm (D-5(4) -> F-7(5)). For Ca9Y0.30Tb0.70(PO4)(7) system, quantum efficiency and CIE chromaticity coordinates were determined to be 96% and (0.252, 0.564), respectively. The results asobtained predict the potential implications of Ca9Y0.30Tb0.70(PO4)(7) nanophosphor as primary green component in WLEDs.
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页数：9
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