新型绿色发光材料(Ce_(0.67)Tb_(0.33))MgAl_(11)O_(19)∶Mn^(2+)的合成及其光学性能  

Synthesis and Photoluminescence Properties of A Novel Green-emitting Phosphor(Ce_(0.67)Tb_(0.33))MgAl_(11)O_(19)∶Mn^(2+)

作　　者：夏章艮[1] 梁玉军[1,2] 黄文珠[1] 李云丽[1] 杨帆[1] 李雪静[1] 

机构地区：[1]中国地质大学材料与化学学院,湖北武汉430074 [2]中国地质大学教育部纳米矿物材料及应用工程研究中心,湖北武汉430074

出　　处：《发光学报》2013年第2期144-148,共5页Chinese Journal of Luminescence

基　　金：国家自然科学基金(21171152);广东省部产学研项目(2010B090400437)资助项目

摘　　要：采用高温固相法成功地合成了新型高效绿色荧光粉(Ce0.67Tb0.33)Mg1-xAl11O19∶xMn2+。通过XRD和荧光光谱等对其结构及发光性能进行了系统研究。结果表明:新合成的(Ce0.67Tb0.33)Mg1-xAl11O19∶xMn2+与典型的商用绿粉(Ce0.67Tb0.33)MgAl11O19(CMAT)具有相同的晶体结构;激发光谱处于237～326 nm范围内,由一个峰位位于291 nm的宽激发带组成,这是典型的Ce3+的特征激发;在紫外光激发下,该荧光粉除了在490,541,590,620 nm存在Tb3+的特征发射峰外,还在516 nm出现了一个较强的归属于Mn2+的4T1g(G)→6A1g(S)电子跃迁的宽发射峰。Mn2+作为共激活剂增大了该荧光材料在绿色区域的发射面积,其中(Ce0.67Tb0.33)Mg0.850Al11O19∶0.150Mn2+荧光粉发射光谱的积分面积最大,为CMAT的226%,其CIE坐标为(0.194,0.695),比CMAT(0.288,0.572)更加接近NTSC标准值(0.21,0.71),即Mn2+的引入不但提高了荧光粉的发光效率,而且改善了其色纯度。结果表明新型(Ce0.67Tb0.33)Mg1-xAl11O19∶xMn2+绿色荧光粉比传统的CMAT在显示领域具有更好的潜在应用前景。The novel green-emission phosphors（Ce0.67Tb0.33）Mg1-xAl11O19∶xMn2＋ have been prepared at 1 300℃ by solid-state reaction method.The crystal structure and photoluminescence properties were characterized by XRD and fluorescence spectra,respectively.The results show that（Ce0.67Tb0.33）Mg1-xAl11O19∶xMn2＋ has the same crystal structure with the typical commercial green phosphor（Ce0.67Tb0.33）MgAl11O19（CMAT）.The excitation spectrum consists of a broad band range from 237 to 326 nm centered at 291 nm,which can be attributed to the characteristic excitation peaks of Ce3＋.While excited under ultraviolet light,the phosphors exhibit not only the characteristic emission peaks of Tb3＋ at 490,541,590 and 620 nm,but also a new broad emission band around 516 nm,which is assigned to the 4T1g（G）→6A1g（S） electron transition of Mn2＋.The integral area of the emission spectrum increases while doped with Mn2＋ as a co-activator,and the integral area is about 226% of CMAT as x=15.0%,and the CIE 1931 chromaticity coordinates of Mn2＋ doped phosphors（0.194,0.695） are closer to the NTSC standard values（0.21,0.71） while compared with CMAT（0.288,0.572）.The results indicate that this new phosphor has a higher luminous efficiency in green area and color purity than that of CMAT,and it has a promising application in display fields.

关 键 词：(Ce0 67Tb0 33)Mg1-xAl11O19∶xMn2+ 荧光粉 光致发光 

分 类 号：O482.31[理学—固体物理]