白光LED用黄色荧光粉Ba(Y1-0.5x-yAly)2S4:xHo3+的合成和发光特性

摘要

The Ba(Y1-05x-yAly)2S4:x;Ho3+ phosphors were synthesized by a high temperature solid-state reaction method. Under the excitation of 465 nm, the emission spectra of these phosphors exhibit three sharp emission lines peaked at about 492, 543 and 661 nm corresponding to 5F3→5I8, (5S2,5F4)→5I8 and 5F5→5I8 typical transitions of Ho3+, respectively. The luminescent color of singly doping phosphor BaY2S4:xHo3+ can be tuned from green to red with increasing the molar amount of Ho3+. The relative luminescent intensities of these phosphors are enhanced by replacing Y3+ ions in BaY2S4 crystal with an appropriate amount of Al3+ ions. Phosphor Ba(Y0.665Al0.3)2S4:0.07Ho3+ emits yellow light under 465 nm excitation, which indicate it is a potential applied yellow phosphor for white LED.%采用高温固相法合成了Ba(Y1-0.5x-yAALy)2S4:xHo3+系列荧光粉.在465 nm蓝光激发下,荧光粉的发射光谱呈多谱带发射,主峰位于492、543和661 nm处,分别对应于Ho3+的5F3→5I8,(5S2,5F4)→5I8和5F5→5I8跃迁发射.研究了Ho3+和Al3+掺杂量对BaY2S4:Ho3+发光性能的影响.结果表明,随着Ho3+掺杂量的逐渐增大,荧光粉的发光颜色由绿色逐渐向红色转变;适量Al3+取代Y3+可以提高BaY2s4:Ho3+光粉的发光强度.荧光粉Ba(Y0.665Al0.3)2S4:0.07 Ho3+在蓝光(465 nm)激发下发射黄光,是一种潜在的白光LED用黄色荧光粉.