Effect of BCP ultrathin layer on the performance of organic light-emitting devices

作     者：WANG Hong YU Jun-sheng LI Lu TANG Xiao-qing JIANG Ya-dong 

作者机构：School of Optoelectronic Information State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu 610054 China 

出 版 物：《Optoelectronics Letters》 (光电子快报（英文版）)

年 卷 期：2008年第4卷第5期

页      面：317-320页

核心收录：

学科分类：08[工学] 0803[工学-光学工程] 

基　　金：National Natural Science Foundation of China (Grant No.60425101) Program for New Cen-tury Excellent Talents in University (Grant No.NCET-06-0812) the Young Excellence Project of UESTC (Grant No.060206.) 

主　　题：电致发光器件 超薄层 OLEDs 异质结构 

摘      要：Based on conventional double layer device, triple layer organic light-emitting diodes (OLEDs) with two heterostructures of indium-tin oxide (ITO)/N,N -diphenyl-N,N -bis(1-naphthyl)(1,1 -biphenyl)-4,4 -diamine(NPB)/2,9-dimethyl-4,7-diphenyl- 1,10-phenanthroline (BCP)/ 8-Hydroxyquinoline aluminum (Alq3)/Mg:Ag using vacuum deposition method have been fabricated. The influence of different film thickness of BCP layer on the performance of OLEDs has been investigated. The results showed that when the thickness of the BCP layer film gradually varied from 0.1 nm to 4.0 nm, the electrolumines- cence (EL) spectra of the OLEDs shifted from green to greenish-blue to blue, and the BCP layer acted as the recombination region of charge carriers related to EL spectrum, enhancing the brightness and power efficiency. The power efficiency of OLEDs reached as high as 7.3 lm/W.