Highly efficient tandem white organic light-emitting diodes based upon C 60/NaT4 organic heterojunction as charge generation layer

Yonghua Chen, Hongkun Tian, Jiangshan Chen, Yanhou Geng, Donghang Yan, Lixiang Wang, Dongge Ma

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

We present a high-efficiency tandem white organic light-emitting diode based upon a C 60/5,5′′′-bis(naphth-2-yl)-2, 2′:5′,2′′:5′′,2′′′- quaterthiophene (NaT4) organic heterojunction as a charge generation layer. A maximum current efficiency, maximum power efficiency, and maximum external quantum efficiency of 111.3 cd A -1, 50.5 lm W -1, and 38.7%, respectively, are obtained. More importantly, the efficiency roll-off is greatly improved with only a slight roll-off to109 cd A -1, 40.3 lm W -1, and 38% at a luminance of 1000 cd m -2. Surprisingly, the electroluminescent spectrum is highly stable at all levels of luminance. Furthermore, our tandem device shows better operational stability than a tandem device employing a conventional charge generation layer. It is concluded that the excellent charge generation, transport, and extraction in the C 60/NaT4 organic heterojunction-based CGL is responsible for the high performances.

Original languageEnglish
Pages (from-to)8492-8498
Number of pages7
JournalJournal of Materials Chemistry
Volume22
Issue number17
DOIs
StatePublished - 7 May 2012
Externally publishedYes

Fingerprint

Dive into the research topics of 'Highly efficient tandem white organic light-emitting diodes based upon C 60/NaT4 organic heterojunction as charge generation layer'. Together they form a unique fingerprint.

Cite this