发光学报, 2010, 31 (2): 185, 网络出版: 2010-05-31   

LiSrPO4∶Tb3+荧光粉的制备及发光特性

Luminescent Properties of LiSrPO4∶Tb3+ Green Phosphor
作者单位
河北大学 物理科学与技术学院发光与显示研究所, 河北 保定 071000;河北大学 电子信息工程学院, 河北 保定 071000
摘要
采用高温固相法合成了LiSrPO4∶Tb3+发光材料,测定了荧光粉的激发光谱和发射光谱,该荧光粉的激发主峰位于330~390 nm,属于4f→4f电子跃迁吸收,与UVLED管芯相匹配。在紫外激发下的发射峰由位于490 nm(5D4-7F6)、545 nm(5D4-7F5)、585 nm(5D4-7F4)、622 nm(5D4-7F3)的四组线状峰构成,对应Tb3+的特征跃迁,其中545 nm处最强,呈现绿色发光。考察了掺杂离子浓度对样品发光效率的影响,Tb3+的最佳掺杂摩尔分数为9%,分析了其自身浓度猝灭机理,探讨了敏化剂Ce3+离子的加入对荧光粉发光强度的影响。LiSrPO4∶Tb3+是一种适用于白光LED的绿色荧光材料。
Abstract
The LiSrPO4∶Tb3+ green phosphor was synthesized by the general high temperature solid-state reaction and an efficient green emission under near-ultraviolet excitaion was observed. The X-ray diffraction pattern indicated that pure LiSrPO4∶Tb3+ phosphor was obtained. Its luminescence properties were investigated and showed four major emission peeks locating at 490, 545, 585 and 622 nm, corresponding to the 5D4→7F6,5D4→7F5, 5D4→7F4 and 5D4→7F3 typical transitions of Tb3+, respectively, and the strongest one appears at 545 nm. The excitation spectrum contains a broad band extending in 200~400 nm, which is coupled well with the emission of ultraviolet light-emitting diodes (UVLEDs). The influence of the doped content of Tb3+ ions on the emission intensity was also investigated and the concentration quench occurs when the doped content of Tb3+ ions is beyond 9%, which can be explained by electric multipole-multipole interaction according to Dexters theory. It was also found that the Ce3+ ions in the system can make the emission intensity of LiSrPO4∶Tb3+ increase. The value of emission intensity reaches the maximum when the concentration of Ce3+ ions is 3%. In conclustion, the LiSrPO4∶Tb3+ is a potential green-emitting phosphor for white LEDs.

杨志平, 马欣, 宋兆丰, 王凤和, 郭颖楠, 闻建伟. LiSrPO4∶Tb3+荧光粉的制备及发光特性[J]. 发光学报, 2010, 31(2): 185. YANG Zhi-ping, MA Xin, SONG Zhao-feng, WANG Fen-he, GUO Ying-nan, Wen Jian-wei. Luminescent Properties of LiSrPO4∶Tb3+ Green Phosphor[J]. Chinese Journal of Luminescence, 2010, 31(2): 185.

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