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Syntheses and Photoluminescence Properities of LaSi3N5∶Ce3+ Blue Phosphors by Carbothermal Reduction Method |
CHEN Ru-biao1, WANG Le1*, ZHOU Tian-liang2, LI Xiao-yan1*, LUO Dong1, PAN Hua-yan1 |
1. College of Optical and Electronic Technology, China Jiliang University, Hangzhou 310018, China
2. College of Materials, Xiamen University, Xiamen 361000, China |
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Abstract LaSi3N5∶Ce3+blue phosphors were prepared by carbothermal reduction method. The influence of C content and heat-dealing on purity and luminescence of samples were investigated. The phosphors were characterized by X-ray diffraction (XRD) and fluorescence spectrophotometer (PL). XRD patterns revealed that LaSi3N5∶Ce3+could be combusted at 1 600 ℃. There was a single-peak broadwide emission spectrum between 380~600 nm due to the electron transfer of Ce3+ from 5d-4f excited by 360 nm. The luminescence intensity reached the maximum value atnC/nLa=4/1 followed by a continuous decline with a red shift and then a blue shift appeared in the spectrum. The luminescence intensity of samples improved 60%~345% after heat-dealing. WLED were fabricated by applying a blend mixture of the sample and commercial YAG on a UV chip (λ blend m), which indicated that LaSi3N5∶Ce3+blue phosphor had a potential application value in WLED.
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Received: 2016-10-31
Accepted: 2017-04-26
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Corresponding Authors:
WANG Le, LI Xiao-yan
E-mail: calla@cjlu.edu.cn; 06b0402034@cjlu.edu.cn
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