摘要
采用高温固相反应法合成了新型LaInO3∶Eu3+红色荧光粉。晶体物相和发光性能分别用XRD、荧光分度计进行表征。XRD图谱表明在1150℃制备了纯相的LaInO3∶Eu3+荧光粉。该荧光粉能够被394nm近紫外光和464nm蓝光有效激发,其最强发射峰位于610nm处,对应于Eu3+离子的5 D0→7F2的特征发射。改变Eu3+离子掺杂浓度,发射峰形状和位置基本不变,发射强度在Eu3+离子浓度超过20%(摩尔分数)时剧烈下降,出现了浓度猝灭效应。Eu3+位于610nm的发射自身猝灭机理是电四极-电四极的相互作用。研究结果显示LaInO3∶Eu3+是一种有潜力的用于制造白光LED的红色荧光粉。
A novel red-emitting LaInO3∶Eu3＋ phosphor was synthesized by the high temperature solid-reaction method.The structure phases and luminescence properties for the as-prepared phosphors were respectively characterized with XRD and fluorescence spectrometer.The analysis of XRD shows that the pure LaInO3∶Eu3＋ phase was obtained at 1150℃.The excitation and emission spectra indicate that the phosphors could be efficiently excited at 394 or 464nm and the strongest emission peak was 610nn due to 5D0→7F2 transition of Eu3＋ ions.The emission shape and location hardly changed with different Eu3＋-doped concentration,but the emission intensity decreased greatly at the time of beyond 20mol% Eu3＋ concentration.The mechanism for the concentration self-quenching of Eu3＋ at 610nm emission results from the quadripole-quadripole reaction.From the results,the LaInO3∶Eu3＋ is suggested as a promising phosphor to fabricate white LEDs.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2011年第12期2193-2195,共3页
Journal of Functional Materials
基金
重庆市科委科技创新能力建设基金资助项目(CSTC2009CF0024)
关键词
固相反应
发光性能
荧光粉
浓度猝灭
白光LED
solid-reaction
luminescence properties
phosphor
concentration quenching
white LED
