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Color Point Tuning by Partial Ba2+ Substitution of Ca 2+ in (Ca1-xBax)3(PO 4)2 Phosphor for White Light Emitting Diodes

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Authors
Li, Y.
Yu, H.
Deng, D.
Hua, Y.
Zhao, S.
Jia, Guohua
Wang, H.
Huang, L.
Li, Y.
Li, C.
Xu, S.
Date
2013
Type
Journal Article

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Li, Y. and Yu, H. and Deng, D. and Hua, Y. and Zhao, S. and Jia, G. and Wang, H. et al. 2013. Color Point Tuning by Partial Ba2+ Substitution of Ca 2+ in (Ca1-xBax)3(PO 4)2 Phosphor for White Light Emitting Diodes. Journal of Solid State Chemistry. 199: pp. 248-252.
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Journal of Solid State Chemistry
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Nanochemistry Research Institute
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Abstract

A potential phosphor (Ca1-xBax)3(PO 4)2:Eu2+ was synthesized by a solid-state reaction. X-ray diffraction (XRD) analysis confirmed the formation of (Ca 1-xBax)3(PO4)2 crystal phase. With the Ba2+ content increasing, the bandgap of (Ca 1-xBax)3(PO4)2 increases from 5.5 to 5.9 eV, and the crystal field splitting between the two lowest Eu2+ 5d levels is enhanced from 6085 to 6808 cm-1 in (Ca1-xBax)3(PO4)2. As a result, the emission peak of (Ca1-xBax) 3(PO4)2: Eu2+ shifts from 447 to 550 nm, which means that the emission color alters from blue to yellow. The redshift of the emission band of (Ca1-xBax) 3(PO4)2:Eu2+ was explained based on crystal field strength, covalence, Stokes shift. The results revealed that partial substitution of Ca2+ by Ba2+ ions was therefore a much considerable way to shift the color point of LEDs. © 2013 Elsevier Inc. All rights reserved.