Photoluminescence properties of Eu²⁺ and Mg²⁺ co-doped CaSi₂O₂N₂ phosphor for white light LEDs

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• 作者：Yajun Lu^a ; Guoying Shi^c ; Qinghong Zhang^b ; Hongzhi Wang^a ; ^{wanghz@dhu.edu.cn} ; Yaogang Li^b ; ^{yaogang_li@dhu.edu.cn}
• 关键词：Phosphor ; Luminescence ; Co-doping ; Concentration quenching
• 刊名：Ceramics International
• 出版年：2012
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：May, 2012
• 卷：38
• 期：4
• 页码：3427-3433
• 文件大小：1284 K

摘要

CaSi₂O₂N₂:Eu, Mg phosphors have been synthesized through the conventional high temperature solid-state reaction method. The effect of Mg²⁺ doping on the structure and photoluminescence (PL) properties of CaSi₂O₂N₂:Eu, Mg was investigated systematically. The results reveal that the phosphor retains the CaSi₂O₂N₂ single phase, with the lattice expanding upon increasing the Mg²⁺ concentration, in an appropriate range. The average size of CaSi₂O₂N₂:Eu, Mg phosphor is 3-8 渭m. At a certain concentration, doping Mg²⁺ ions can greatly enhance the absorption and PL intensity of CaSi₂O₂N₂:Eu, Mg phosphors. The temperature dependent luminescence measurements show that the thermal quenching remains small in the case of Mg²⁺ doping, in other word, Eu²⁺/Mg²⁺ co-doped phosphor has a good thermal stability. Furthermore, the quenching concentration of Eu²⁺ in phosphors can also be increased by doping Mg²⁺. Therefore, this novel CaSi₂O₂N₂:Eu, Mg phosphor is promising for white light emitting diodes (white-LEDs).