Issue 9, 2010
From the journal:

Journal of Materials Chemistry

Ca2PO4Cl : Eu2+: an intense near-ultraviolet converting blue phosphor for white light-emitting diodes

Yi-Chen Chiu,a   Wei-Ren Liu,*a   Chun-Kuei Chang,b   Cheng-Chun Liao,c   Yao-Tsung Yeh,a   Shyue-Ming Janga  and  Teng-Ming Chen*b  

* Corresponding authors

a Material and Chemical Research Laboratories, Industrial Technology Research Institute, Hsinchu, Taiwan
E-mail: WRLiu@itri.org.tw, tmchen@mail.nctu.edu.tw
Tel: + 886-3-5732438

b Phosphors Research Laboratory and Department of Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan

c Electronics and Optoelectronics Research Laboratories, Industrial Technology Research Institute, Hsinchu, Taiwan

Abstract

A blue phosphor Ca2PO4Cl : Eu2+ was synthesized by solid state reaction and evaluated as a candidate for white LEDs. The luminescent intensity of Ca2PO4Cl : Eu2+ was found to be 128% under excitation at 380 nm, 149% under 400 nm, and 247% under 420 nm, as high as that of BaMgAl10O17 : Eu2+. Furthermore, Ca2PO4Cl : Eu2+ reveals high quantum efficiency and excellent thermal stability. By utilizing a mixture of blue-emitting Ca2PO4Cl : Eu2+, green-emitting (Ba,Sr)2SiO4 : Eu2+ and red-emitting CaAlSiN3 : Eu2+ as light converters, an intense white GaN-based n-UV-LED (400 nm) was fabricated to exhibit an excellent color-rendering index Ra of 93.4 at a correlated color temperature of 4590 K. Based on the results, we are currently evaluating the potential application of Ca2PO4Cl : Eu2+ as a blue-emitting near-UV convertible phosphor.

Graphical abstract: Ca2PO4Cl : Eu2+: an intense near-ultraviolet converting blue phosphor for white light-emitting diodes

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Article information

DOI
https://doi.org/10.1039/B920610H
Article type
Paper
Submitted
02 Oct 2009
Accepted
30 Nov 2009
First published
14 Jan 2010

J. Mater. Chem., 2010,20, 1755-1758

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Ca2PO4Cl : Eu2+: an intense near-ultraviolet converting blue phosphor for white light-emitting diodes

Y. Chiu, W. Liu, C. Chang, C. Liao, Y. Yeh, S. Jang and T. Chen, J. Mater. Chem., 2010, 20, 1755 DOI: 10.1039/B920610H

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