Chromaticity of inhomogeneous broadening effect on CaxSr1-xAl2O4:Eu2+ phosphors

被引：0
|
作者：
Chen, Li-Te [1 ]
Hwang, Chii-Shyang [1 ]
Chen, In-Gann [1 ]
Chang, Shoou-Jinn [2 ]
机构：
[1] Department of Material Science and Engineering, National Cheng Kung University, Tainan, Taiwan
[2] Institute of Micro-Electro-Mechanical-System Engineering, National Cheng Kung University, Tainan, Taiwan
来源：
Journal of Alloys and Compounds | 2006年 / 426卷 / 1-2期
关键词：
In this study; calcium strontium aluminate phosphors CaxSr1-xAl2O4 doped 1 mol% Eu2+ was prepared as the fluorescent material for UV-LED performed as a light source. The crystal structure; peak wavelength (λp); and chromaticity were investigated by XRD patterns and photoluminescence (PL); respectively. The inhomogeneous broadening effects of emission spectra were also discussed by electron paramagnetic resonance (EPR). In the CaxSr1-xAl2O4:Eu2+ system; the dominant structure transforms from monoclinic to hexagonal at 0.2 &le x &le 0.5; and λp ranges from 440 to 529 nm. The shift in λp could be explained by the crystal field effect; which is affected by different coulomb attracting forces due to the various fractions of Ca2+/Sr2+ in the host lattice. The near-white chromaticity of Ca0.5Sr0.5Al2O4:Eu2+ (1 mol%) phosphor was explained by the reasons of inhomogeneous broadening and re-absorption effects. The EPR spectra indicated that the inhomogeneous broadening effect could be attributed to the substitutional disorder (compositional disordering) of Ca2+and Sr2+ in the host lattice. © 2006 Elsevier B.V. All rights reserved;
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页码：395 / 399
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