文献类型：期刊文献

英文题名：Field- and thickness-dependent performance of tandem organic light-emitting diodes with buffer-modified fullerene/copper phthalocyanine heterojunction as interconnector

作者：Lu, Zhaoyue[1];Li, Xiong[2];Wang, Yue[3];Xiao, Jing[4];Xu, Penglai[1]

机构：[1]E China Univ Sci & Technol, Sch Sci, Dept Phys, Shanghai 200237, Peoples R China;[2]Beijing Technol & Business Univ, Sch Sci, Beijing 100048, Peoples R China;[3]Beijing Jiaotong Univ, Inst Optoelect Technol, Key Lab Luminescence & Opt Informat, Minist Educ, Beijing 100044, Peoples R China;[4]Taishan Univ, Phys & Elect Engn Coll, Tai An 271021, Shandong, Peoples R China

年份：2014

卷号：14

期号：11

起止页码：1465

外文期刊名：CURRENT APPLIED PHYSICS

收录：;EI(收录号：20144200095641);WOS:【SCI-EXPANDED(收录号:WOS:000343693200012)】；

基金：Z. Y. Lu thanks financial support of Fundamental Research Funds for the Central Universities (222201314022) and China Postdoctoral Science Foundation (2013M541480). And J. Xiao thanks financial support the National Natural Science Foundation of China (61204051) and the Science & Technology Development Project of Tai'an (20122053).

语种：英文

外文关键词：Organic heterojunction; Electric-generated-charge; Photo-generated-charge; Fullerene; Copper phthalocyanine

摘要：Tandem organic light-emitting diodes (OLEDs) with the buffer-modified fullerene/copper phthalocyanine (LiF/C60/CuPc/MoO3) as interconnector have been investigated. The properties of tandem OLEDs are dependent on electric field, which is induced by electric-field-dependence of charge generation (by electric filed and photons) and separation in such an interconnector structure. At low electric field, because of less generated-charges and light-absorption of C60/CuPc film, current efficiency and brightness of tandem OLEDs with two emissive units exhibit less than twice higher than those of conventional single-unit device. But more than twofold enhancement of current efficiency and brightness is observed at higher electric field due to a large number of charges generated in the interconnector. Meanwhile, the performance of tandem devices is affected by the thickness of C60 and CuPc. The optimal thickness is related to their exciton diffusion length. (C) 2014 Elsevier B.V. All rights reserved.