PDF全文下载：2011030221
韩荣江， 刘占卿， 陈克正
(青岛科技大学 材料科学与工程学院，山东 青岛 266042)
摘要: 以NH4HCO3溶液为沉淀剂，采用共沉淀法制备了前驱体，在氩气气氛中1 200 ℃煅烧3 h合成了Y2.94-xCexPr0.06Al5O12（YAG:Ce, Pr）粉体。利用X射线衍射仪、透射电子显微镜、荧光光谱仪对样品的结构、形貌及发光性能进行了表征。结果表明，所得粉体为体心立方相Y3Al5O12:Ce, Pr,粉体颗粒团聚成珊瑚虫形，YAG:Ce, Pr粉体的激发光谱有3个激发带，峰值分别位于290，342和450~470 nm处。用290 nm的紫外线激发YAG:Ce, Pr粉体，出现了4个发射带，峰值分别位于386 nm（Pr3+的4f15d1→3F3, 3F4跃迁），489 nm（Pr3+的3P0→3H4跃迁），535 nm（Ce3+的4f05d1→2F7/2，2F5/2跃迁）和612 nm（Pr3+的1D2→3H4跃迁）。而用460 nm的蓝光激发YAG:Ce, Pr粉体，则出现2个发射带，峰值分别位于535 nm（Ce3+的4f05d1→2F7/2，2F5/2跃迁）和612 nm（Pr3+的1D2→3H4跃迁）。对YAG:Ce, Pr中Ce3+与Pr3+之间发生的能量转移进行了讨论。
关键词: YAG:Ce, Pr； 共沉淀法； 发光性能
中图分类号: O 482.31文献标志码： A
Preparation and Luminescent Properties of YAG:Ce, Pr Powders
HAN Rong-jiang, LIU Zhan-qing, CHEN Ke-zheng
(CollegeofMaterials Scienceand Engineering,QingdaoUniversityof Science and Technology,Qingdao266042,China)
Abstract: The precursor was prepared via a co-precipitation method using NH4HCO3 solution as the precipitator. Then, Y2.94-xCexPr0.06Al5O12 (YAG:Ce, Pr) powders were obtained by calcining the precursor at 1 200 ℃ for 3 hours in argon atmosphere. The structure, morphology and luminescent properties of the powders were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM) and photoluminescence method. The as-calcined powder is a body-center cubic YAG:Ce, Pr phase. The YAG:Ce, Pr particles were agglomerated and coral-like in shape. The excitation spectra of YAG:Ce, Pr powders consist of three excitation bands at 290 nm, 342 nm and 450~470 nm, respectively. When excited with a ultraviolet light of 290 nm, the YAG:Ce, Pr powders showed four emission bands at 386 nm (4f15d1→3F3, 3F4 transitions of Pr3+), 489 nm (3P0→3H4 transition of Pr3+), 535 nm (4f05d1→2F7/2, 2F5/2 transitions of Ce3+) and 612 nm (1D2→3H4 transition of Pr3+). However, when excited with a blue light of 460 nm, the YAG:Ce, Pr powders showed two emission bands at 535 nm (4f05d1→2F7/2, 2F5/2 transitions of Ce3+) and 612 nm (1D2→3H4 transition of Pr3+). The energy transfer between Ce3+ and Pr3+ in YAG:Ce, Pr powders has been discussed.
Key words: YAG:Ce, Pr; co-precipitation method; luminescent property
收稿日期:2011-01-08
基金项目: 国家自然科学基金项目（51072087）；山东省中青年科学家科研奖励基金项目（BS2010CL020）.
作者简介: 韩荣江（1971—）,男，副教授.
