Thermally stable luminescence of blue LiSrPO4:Eu2+ phosphor for near-UV light-emitting diodes |
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Authors: | J. Liu Z. Wu M. Gong |
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Affiliation: | 1. College of Chemical Engineering, Qingdao University of Science & Technology, Qingdao, 266042, China 2. State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou, 510275, China
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Abstract: | Blue phosphor, LiSrPO4:Eu2+, was prepared by solid-state reaction method under a weak reductive atmosphere and investigated by means of photoluminescence, concentration quenching process, and temperature dependence of luminescence. These results show that LiSrPO4:Eu2+ can be efficiently excited by the UV-visible light of 250–440 nm and exhibits bright blue emission. Furthermore, Eu2+-doped LiSrPO4 phosphor shows high thermally stable luminescence comparable to commercial phosphor BaMgAl10O17:Eu2+ (BAM). Two bright blue LEDs were fabricated by incorporating an InGaN-based near-UV chip with the obtained phosphor LiSrPO4:Eu2+ and BAM, respectively. Their luminescence properties were compared based on different forward-bias currents. All the characteristics suggest that LiSrPO4:Eu2+ is a good blue phosphor candidate for creating white light in phosphor-conversion white LEDs. |
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