The metal interlayer in the charge generation layer of tandem organic light-emitting diodes

Yu Hao Lee, Ming Wei Lin, Ten Chin Wen, Tzung Fang Guo

研究成果: Article同行評審

16 引文 斯高帕斯(Scopus)

摘要

This work studies the interface in the charge generation layer (CGL), consisting of aluminum (Al) doped in poly(ethylene glycol) dimethyl ether as an n-type layer and 2, 3, 5, 6-tetrafluoro-7, 7, 8, 8-tetracyanoquinodimethane (F4-TCNQ) doped in N,N′-bis-(1-naphthyl)-N,N′-diphenyl-1, 1′-biphenyl-4-4′-diamine as an p-type layer, in tandem organic light-emitting diodes (OLEDs). Introducing a thin high work function metal interlayer (e.g., Ag or Au) effectively improves the transport and inhibits the accumulation of charges in the CGL, which markedly reduces the operating voltage and enhances the efficiency of tandem OLEDs. We attribute that the high density of surface states on metal clusters (interlayer) reduce the junction barrier to facilitate the transport of carriers through CGL. Experimental results show enhancements of tandem OLEDs by an additional metal interlayer as follows: luminous efficiency increases from 37.2 to 51.4 cd A-1, the light turn-on voltage decreases from 9.2 to 6.6 V, and luminescence at 10 mA cm -2 increases from 3712 to 5211 cd m-2.

原文English
文章編號154512
期刊Journal of Applied Physics
114
發行號15
DOIs
出版狀態Published - 2013 10月 21

All Science Journal Classification (ASJC) codes

  • 一般物理與天文學

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