微波辅助凝胶燃烧法合成红色荧光粉Ca_2MgSi_2O_7:Eu^(3+)及性质研究  

Synthesis and Properties of Red-emitting Phosphors Ca_2MgSi_2O_7:Eu^(3+) by Gel-combustion Method Assisted by Microwave

作　　者：翟永清[1] 王莉莉[1] 马健[1] 胡志春[1] 王腾[1] 姜楠[1] 

机构地区：[1]河北大学化学与环境科学学院,保定071002

出　　处：《人工晶体学报》2013年第1期78-83,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(20675023)资助项目;河北省科技支撑计划项目(10276732)

摘　　要：采用微波辅助凝胶燃烧法制备了Ca2MgSi2O7∶Eu3+红色荧光粉,运用XRD、荧光分光光度计等对合成样品进行分析表征,并探讨了焙烧温度、助熔剂用量、Eu3+浓度等对样品发光性能的影响。结果表明:所得样品为四方晶系的Ca2MgSi2O7晶体结构。Ca2MgSi2O7∶Eu3+的激发光谱由一宽带和一组锐线峰组成,分别归属于Eu3+-O2-之间的电荷迁移态和Eu3+的f→f跃迁。样品的发射光谱主要由两个强发射峰组成,分别位于591 nm和619 nm处,属于Eu3+的5D0→7F1磁偶极跃迁和5D0→7F2的电偶极跃迁。研究发现:当焙烧温度为1000℃、助熔剂H3BO3用量为15%时,样品发光性能较好;Eu3+浓度(x)对样品Ca2-xMgSi2O7∶Eu3x+的发光强度影响较大,当Eu3+浓度x在0.02～0.16范围内变化时,随着Eu3+浓度的增加,样品的发光强度不断增加,未出现明显的浓度猝灭现象。Red phosphors Ca2MgSi2O7：Eu3＋ were synthesized by a gel-combustion method assisted by microwave. The as-synthesized red phosphors were analyzed and characterized by XRD and fluorescence spectrophotometer. The effects of calcination temperature, dosage of flux and Eu3＋ concentration on the luminescent properties of the samples were investigated. The results show that the red phosphors Ca2MgSi2O7：Eu3＋ possesses a tetragonal crystal structure, which is the same as that of Ca2MgSi2O7. The excitation spectrum of Ca2MgSi2O7：Eu3＋ is composed of a broad band and a series of sharp peaks, belonged to the charge transfer between Eu3＋-O2 and f-f transition of Eu3＋ respectively. The emission spectrum consists of two strong emission peaks at 591 nm and 619 nm, ascribed to 5D0→7Fl magnetic dipole transition of and 5D0→7F2 electric dipole transition of Eu3＋ respectively. It is found that the sample shows better luminescent properties when the calcination temperature is 1000 ℃, dosage of flux H3BO3 is 15%. The concentration （x） of Eu3＋ has great effect on the luminescent intensity of Ca2-x MgSi2OT： Eu3x＋. When the value of x is in the range of O. 02-0.16, the luminescence intensity of the sample increases gradually with the increase of Eu3＋ concentration. It is interesting that no concentration quenching occurs.

关 键 词：Ca2MgSi2O7 Eu3+ 红色发光粉 凝胶燃烧法 发光强度 白光发光二极管 

分 类 号：TB34[一般工业技术—材料科学与工程]