【作者】 王子君； 任新光； 张立功； 范翊； 蒋大鹏； 吕安德；

【Author】 Wang Zijun Ren Xingguang Zhang Ligong Fan Yi Jiang Dapeng LüAnde (Changchun Institute of Physics,Chinese Academy of Sciences,Changchun,130021,China)

【机构】 中国科学院长春物理研究所；

【摘要】 用真空蒸发方法制备了结构为导电玻璃/ TPB/ZnQ₂/Mg:Ag的有机薄膜电致发光二极管,测量粉末和薄膜状态下的8-基喹啉锌（ZnQ）₂光致发光谱,ZnQ₂薄膜吸收光谱以及器件的电致发光谱。观察到薄膜相对于粉末的光致发光谱峰发生很大的移动,薄膜光致发光峰位置相对吸收光谱吸收边也有很大的移动,ZnQ₂薄膜电致发光谱与薄膜光致发光谱基本一致。测量了器件的伏安特性,发现器件存在两个特征电压,一个与薄膜厚度基本无关,器件在此正向偏压下电流虽然小但可以看到电致发光,另一个随薄膜厚度明显增大,在此电压附近,随正向偏压增加电流急剧增大。器件伏安行为复杂,本文作了讨论。更多还原

【Abstract】 8-hydroxyqinoline zinc film electroluminescent diodes with the structure of GLASS/ITO/ TPB/ZnQ₂/Mg:Ag are prepared by vacuum deposition. Photoluminescent spectrum of powder and film ZnQ₂,absorption spectrum of film ZnQ₂,and electroluminescent spectrum of the diode are measured.It is found that there is a large Stocks shift between powder and film photoluminescent spectra,as well as between film photoluminescent spectrum and absorption spectrum edge.The diode electroluminescent spectrum is coinside with photoluminescent spectrum basically. The diodeⅠ-Ⅴcharacteristic is measured,two characteristic voltages are found.One is basically independent of the thickness of ZnQ₂ film.At forward bias the current is very little,but electroluminescence emerges weaklly.Another is dependent on the film thickness obviously,near which,the current is increased suddenly with the voltage increasing.The deviceⅠ-Ⅴcharacteristic is rather curiously,and is discussed carefully.更多还原