| 光谱学与光谱分析 |
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| Preparation and Luminescent Properties of Blue Emitting Phosphor of Sr3(PO4)2∶Eu2+ for White LED |
| WEI Jian1, SHEN Chang-yu1*, SUN Yu-huan2, ZHANG Hong1, WANG Le1*, LI Chen-xia1 |
1. Institute of Optoelectronic Technology, China Jiliang University, Hangzhou 310018, China
2. Materials Science and Engineering, Shanghai University, Shanghai 200444, China |
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Abstract A series of Sr3(PO4)2∶Eu2+ blue phosphors were synthesized by high temperature solid state method under N2-H2 reducing atmosphere. The crystal structures, excitation and emission spectra were characterized by X-ray diffraction (XRD) and Photoluminescence (PL), respectively. The results show that the Sr3(PO4)2∶Eu2+ phosphor can be efficiently excited by the wavelengths ranging from 310 to 390 nm, and the excitation peak wavelength locates at 359 nm. A wide emission spectrum (～150 nm, originating from the 4f65d1→4f7 of the Eu2+) with a peaking wavelength of 438 nm was obtained. Through the Gaussian fitting, we found that the emission band formed by two luminescence centers（430 and 459 nm）, which indicated that the Eu2+ occupied two different Sr2+ sites in the substrate of Sr3(PO4)2. As the Eu2+ doping concentration is 7%, the maximum luminous intensity was obtained. With the increasing of the doping concentration of the Eu2+, the concentration quenching effect occurred, and the emission peak wavelength has a red shift. The PL intensity of the Sr3(PO4)2∶Eu2+ phosphor is about 1.3 times than that of the blue emitting phosphor BaMgAl10O17∶Eu2+(BAM) which means that it is a promising candidate for the blue phosphor material for white LED.
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Received: 2014-09-09
Accepted: 2014-12-15
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Corresponding Authors:
SHEN Chang-yu, WANG Le
E-mail: shenchangyu@cjlu.edu.cn; calla@cjlu.edu.cn
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