ZnAl_2O_4:Mn薄膜的阴极射线发光特性的研究  

Cathodoluminescent Characteristics of Green-Emitting ZnAl_2O_4:Mn Thin Film Phosphors

作　　者：娄志东[1] 徐征[1] 衣兰杰[1] 杨盛谊[1] 

机构地区：[1]北京交通大学光电子技术研究所发光与光信息技术教育部重点实验室,北京100044

出　　处：《光谱学与光谱分析》2008年第6期1218-1221,共4页Spectroscopy and Spectral Analysis

基　　金：国家"973"计划项目(2003CB314707);国家自然科学基金重点课题(10434030);国家自然科学基金课题(90301004);北京市自然科学基金课题(2062019);北京交通大学校基金项目(2006XM040)资助

摘　　要：采用喷雾热解法在铝矽酸盐陶瓷基底上合成了过渡族金属离子锰(Mn2+)掺杂的铝酸锌(ZnAl2O4)发光膜,研究了ZnAl2O4∶Mn膜在中至低电子束电压(<5 kV)激发下的阴极射线发光特性。生成的ZnAl2O4∶Mn膜在退火温度高于550℃时发出峰值位于525 nm的绿光,是由Mn2+的4T1→6A1跃迁引起的。测量了ZnAl2O4∶Mn膜阴极射线发光的色坐标和色纯度,其色坐标为x=0.150,y=0.734,色纯度为82%。ZnAl2O4∶Mn膜的阴极射线发光亮度和效率依赖于激发电压和电流密度。随着电流密度的增加,观察到了亮度饱和现象。在激发电压为4 kV、电流密度为38μA.cm-2的条件下,ZnAl2O4∶Mn薄膜的亮度可达540 cd.m-2,效率为4.5 lm.W-1。Green electroluminescence was obtained from thin films of ZnAl2O4 ： Mn prepared by rf magnetron sputtering onto thick insulating ceramic sheets. Photolurninescence and stress-stimulated luminescence was obtained for Mn-doped ZnAl2O4 powder synthesized by the solid phase reaction. Since it is extremely stable chemically and thermally, ZnAl2 O4 may emerge as an alternative choice to sulphide-based phosphors. In the present paper, thin films of ZnAl2 O4 ： Mn were grown on aluminosilicate ceramic plates using spray pyrolysis of aqueous solutions. The cathodoluminescenee （CL） properties of the films under low to medium excitation voltage （〈5 kV） were investigated. The films exhibited green CL after being armealed at temperatures above 550 ℃, which corresponds to the transition between ^4 T1 and ^6A1 of Mn^2＋ ions located in the tetra coordination of the Zn^2＋ site in the spinel structure. The chromaticity coordinates were x=0. 150 and y=0. 734 with a dominant wavelength of 525 nm and an 82% color purity. The CL luminance and efficiency depended on the excitation voltage and current density. Saturation effects were observed as the current density increased. A luminance of 540 cd · m^-2 and an efficiency of 4. 5 lm · W^-1 were obtained at an excitation voltage of 4 kV with a current density of 38 uA ·cm^-2.

关 键 词：ZnAl2O4∶Mn薄膜 阴极射线发光 绿光发 

分 类 号：O469[理学—凝聚态物理]