电荷补偿剂对CaAl_2Si_2O_8∶Eu^(3+)结构和发光性能的影响  

Effects of charge compensators on structure and luminescent properties of CaAl_2Si_2O_8∶Eu^(3+) phosphors

作　　者：王飞[1] 田一光[2] 张乔[2] 

机构地区：[1]安徽三联学院实验中心,安徽合肥230601 [2]温州大学化学与材料工程学院,浙江温州325035

出　　处：《兵器材料科学与工程》2014年第6期89-93,共5页Ordnance Material Science and Engineering

基　　金：国家自然科学基金资助(20771086);安徽三联学院院级科研项目资助(2013Z001)

摘　　要：采用高温固相法制备CaAl2Si2O8∶Eu3+,R+(R=Li,Na,K)系列红色荧光粉,研究电荷补偿剂R+对其结构和发光性能的影响。结果表明:CaAl2Si2O8∶Eu3+,R+(R=Li,Na,K)系列红色发光粉的晶体结构与CaAl2Si2O8相同,均属三斜晶系,空间群为P-1,电荷补偿的掺杂R+对基质晶体结构的影响不大,激发光谱由位于220~580 nm的一个宽激发带和一组锐线峰构成,462 nm处Eu3+的7F0-5D2激发峰的强度最强;发射光谱位于550~750 nm内呈多条锐线发射,其中594、615 nm处发射峰最强,归属于Eu3+的5D0-7F1磁偶极跃迁和5D0-7F2电偶极跃迁;CaAl2Si2O8∶Eu3+,R+(R=Li,Na,K)的发射强度均随电荷补偿剂掺杂量的增加,呈先增大后减小的趋势变化,Li+、Na+和K+的最佳掺杂摩尔比为0.04、0.03、0.03,发射强度的提高率分别为138.53%、85.44%和48.35%,Li+作为电荷补偿剂最适宜。A series of red phosphors CaAl2Si2O8∶Eu3＋,R＋（R = Li,Na,K）were prepared by high temperature solid-state reaction.Influence of charge-compensator R＋on structure and luminescence properties of the CaAl2Si2O8∶Eu3＋was studied. The CaAl2Si2O8∶Eu3 ＋,R＋（R= Li,Na,K）red phosphors have the same crystal structure as that of the CaAl2Si2O8,both of them belong to triclinic system,and P-1 space group. Doping with the charge-compensators（Li＋,Na＋,or K＋）has little effect on the crystal structure of the matrix. The excitation spectra are composed of a broad excitation band located at 220 to 580 nm and a group of sharp peaks. The emission spectra are located at 594 to 615 nm,and present a number of sharp lines emission. The emission peak at 594 nm is attributed to5D0-7F1 magnetic dipole transition of the Eu3 ＋,while the peak at 615 nm is because of5D0-7F2 electric dipole transition of the Eu3＋. The emission spectrum intensity of the CaAl2Si2O8∶Eu3＋,R＋（R = Li,Na,K）firstly increases with increasing charge-compensator concentration,then decreases with it. The optimal doping concentration of the Li＋,Na＋and K＋is 0.04,0.03 and 0.03,respectively. And the corresponding improvement in the emission intensity is 138.53%,85.44% and48.35%. Therefore,the Li＋is the most effective charge-compensator.

关 键 词：CaAl2Si2O8 EU^3+ 发光性能 电荷补偿剂 

分 类 号：O614.371[理学—无机化学] O614.338[理学—化学]