【摘要】 采用共沉淀法制备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Y3Al50.2: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。更多还原

【Abstract】 Ce3+-doped yttrium aluminum garnet (YAG:Ce3+) precursors were synthesized by the co-precipitation method with aqueous ammonia as the precipitant. Phosphors were obtained after further calcination. The precursors and phosphors were characterized by DTA, FT-IR, XRD and PL. It was observed that the phosphor calcined at 1200℃ transformed into YAG phase completely. Its excitation spectrum has two peaks, corresponding to the transitions of 2F5/2→5D and 2F7/2→5D, respectively. Its emission peak is at 537 nm, corresponding to the transition of 5d→4f. The highest emission intensity was recorded when x=0.06 (Y3-xAl5012:xCe).更多还原