Promising red phosphors LaNbO4:Eu3+,Bi3+ for LED solid-state lighting application
来源期刊：Journal of Rare Earths2010年第3期
论文作者：黄君丽 周立亚 梁赵萍 龚福忠 韩健鹏 王荣芳
文章页码：356 - 360
摘 要：La0.75NbO4:Eu3+0.25 and La0.65NbO4:Eu3+0.25,Bi3+0.10 phosphors were synthesized by solid-state reaction method,and their photoluminescence properties were discussed in detail.With the increased incorporation of the co-activator Bi3+,the charge transfer（CT） bands of Nb5+→O2-and Eu3+→O2-（-280 nm） weakened and a new and significant broad band Bi3+-O2-（-330 nm） appeared,while the peaks at 395 and 466 nm assigned to f-f transitions of Eu3+ was slightly changed.Compared with the commercial phosphor Y2O2S:0.05Eu3+,La0.75Nb5O4:Eu3+0.25 and La0.65Nb5O4:Eu3+0.25,Bi3+0.10 phosphors emit brighter red light at 615 nm with line spectra upon the excitation of near UV light（395 nm） and exhibited the Commission International d’Eclairage（CIE） chromaticity coordinates（x=0.658,y=0.342） and（x=0.657,y=0.342） that are closer to the standard of national television standard committee（NTSC）.The results showed that La0.75Nb5O4:Eu3+0.25 and La0.65Nb5O4:Eu3+0.25,Bi3+0.10 phosphors might be as promising red phosphors for near UV InGaN-based LED solid-state lighting application.
黄君丽，周立亚，梁赵萍，龚福忠，韩健鹏，王荣芳
School of Chemistry and Chemical Engineering,Guangxi University
摘 要：La0.75NbO4:Eu3+0.25 and La0.65NbO4:Eu3+0.25,Bi3+0.10 phosphors were synthesized by solid-state reaction method,and their photoluminescence properties were discussed in detail.With the increased incorporation of the co-activator Bi3+,the charge transfer（CT） bands of Nb5+→O2-and Eu3+→O2-（-280 nm） weakened and a new and significant broad band Bi3+-O2-（-330 nm） appeared,while the peaks at 395 and 466 nm assigned to f-f transitions of Eu3+ was slightly changed.Compared with the commercial phosphor Y2O2S:0.05Eu3+,La0.75Nb5O4:Eu3+0.25 and La0.65Nb5O4:Eu3+0.25,Bi3+0.10 phosphors emit brighter red light at 615 nm with line spectra upon the excitation of near UV light（395 nm） and exhibited the Commission International d’Eclairage（CIE） chromaticity coordinates（x=0.658,y=0.342） and（x=0.657,y=0.342） that are closer to the standard of national television standard committee（NTSC）.The results showed that La0.75Nb5O4:Eu3+0.25 and La0.65Nb5O4:Eu3+0.25,Bi3+0.10 phosphors might be as promising red phosphors for near UV InGaN-based LED solid-state lighting application.
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