以柠檬酸为螯合剂和燃料,采用溶胶凝胶燃烧合成法制备了一系列组成的YAG:Ce,RE(RE＝Lu,Gd,La)荧光粉.通过XRD、FTIR、SEM、荧光光谱研究了不同煅烧温度、不同共掺杂元素和浓度对荧光粉晶体结构、颗粒形貌及发光性能的影响.结果表明:在煅烧温度900℃时即可制得结晶较好的荧光粉,随煅烧温度的升高,样品的平均颗粒尺寸由50 nm左右逐渐增大到200 nm,发光强度逐渐增强.随离子的半径从La3+到Gd3+再到Lu3+逐渐减小,引起基质相变的取代上限逐渐增大,在仅有50mo1%的La3+掺杂下,样品的主晶相已经变成LaAlO3;Gd3+掺量达到90mo1%～99 mo1%时,样品主晶相仍为立方的YAG相;而Lu3+可以完全取代Y3+而仍然保持立方YAG的石榴石结构不变.当Gd3+取代Y3+时,YAG:Ce3+的发射光谱红移,未出现GdAlO3前最大红移为21 nim,完全取代后最大红移达33 nn,而Lu3+全部取代Y3+时发生24 nim的蓝移.运用晶体场理论和位形坐标模型对此进行了解释.
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