YAG:Ce,Pr粉体的制备与发光性能  

Preparation and Luminescent Properties of YAG:Ce,Pr Powders

作　　者：韩荣江[1] 刘占卿[1] 陈克正[1] 

机构地区：[1]青岛科技大学材料科学与工程学院,山东青岛266042

出　　处：《青岛科技大学学报（自然科学版）》2011年第3期221-224,共4页Journal of Qingdao University of Science and Technology:Natural Science Edition

基　　金：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)

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612nm（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。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.

关 键 词：YAG:Ce Pr 共沉淀法 发光性能 

分 类 号：O482.31[理学—固体物理]