采用共沉淀法制各Y3Al5O12:Ce3+(YAG:Ce3+)荧光体前驱粉末,采用差热分析(DTA)、傅里叶红外(FT-IR)、X-射线衍射(XRD)和荧光光谱(PL)等测试分析手段,对凝胶经不同温度烧成的Y3Al5O12:Ce3+荧光粉的成相过程、晶体结构及其发光性能进行了测试与分析.DTA和XRD结果表明,经1200℃煅烧后,凝胶转变为单相性良好的YAG立方相,空间群为Ia3d(230).PL谱测试结果表明,煅烧热处理获得的YAG:Ce3+荧光粉的激发光谱由2个主峰位于340nm和469 nm的激发峰组成,分别对应于2F5/2→5D和2F7/2→5D的跃迁;发射谱主峰位于537 nm,属于Ce3+的5d→4f特征跃迁发射.不同Ce掺杂浓度的YAG:Ce3+荧光粉的发光性能研究结果表明,随着Ce掺杂浓度增加,荧光粉发光强度先增加后减小,呈现浓度淬灭现象,当x=0.06时,发光强度达到最大值.
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