以高纯稀土氧化物为原料,采用高温固相法合成了[(Y0．5 Gd0．5－x－0．005)Bix Ce0．005]3 Al5 O12高亮黄色荧光粉(x＝0~0．01),并通过XRD、SEM、PL-PLE和FL 等方法对该荧光粉进行了表征.结果表明,在1400℃下煅烧4 h可得到纯石榴石相的(Y,Gd)AG.煅烧所得的[(Y0．5 Gd0．5－x－0．005)Bix Ce0．005]3 Al5 O12荧光粉具有良好的分散性和均一性.在469 nm激发下于563 nm附近呈现黄光发射,且Bi3＋掺杂浓度为0．001 mol时,样品的发射峰强度达到最大值,提高了近56％,归因于 Bi3＋→Ce3＋能量传递和粉体结晶性能的改善.样品的荧光寿命随着Bi3＋掺杂浓度的增加,先增大后减小.
Bi3+-doped [(Y0.5 Gd0.5-x-0.005 )Bix Ce0.005 ]3 Al5 O12 phosphor powders were synthesized by the solid-state reaction method at high temperatures.The synthesized powders were analyzed by XRD,SEM,PL-PLE and FL.The results show that phase-pure garnet (Y,Gd)AG can be obtained upon calcination at 1 400 ℃ for 4 h.The resultant [(Y0.5 Gd0.5-x-0.005 )Bix Ce0.005 ]3 Al5 O12 powders show well-defined morphology and are dispers-ed.Upon excitation at 469 nm,the phosphor powders show strong yellow emission at 563 nm.When Bi3+-do-ping concentration was 0.001 mol,the emission intensity of the phosphor powder had a maximum value and was improved by a factor of 0.56.The observed emission enhancement can be ascribed to Bi3+→Ce3+ energy transfer and the improvement of the powder crystallinity upon Bi3+-doping.The fluorescent lifetime of the phosphors first increased and then decreased with increasing Bi3+-doping concentration.
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