Eur. Phys. J. Appl. Phys. (2015) 72: 20201
https://doi.org/10.1051/epjap/2015150090

Yellow light direct hole-injection structure organic light-emitting device based on bis[2-(4-tert-butylphenyl) benzothiazolato-N,C2'] iridium (acetylicetonate) phosphor

State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC), 610054 Chengdu, P.R. China

^a e-mail: 453721027@qq.com

Received: 13 February 2015
Revised: 5 July 2015
Accepted: 24 September 2015
Published online: 30 October 2015

Abstract

The feasibility of adopting bis[2-(4-tert-butylphenyl) benzothIazolato-N,C-2'] iridium (acetylacetonate) [(t-bt)₂Ir(acac)] in the direct hole-injection structure was investigated. Yellow phosphorescent organic light-emitting diodes based on (t-bt)₂Ir(acac) with this structure were fabricated. The efficiencies of these diodes reached 27.51 lm/W and 53.33 cd/A at a brightness of 45 891 cd/m². The realisation of these excellent efficiencies is ascribed to the characteristics of (t-bt)₂Ir(acac) and the direct hole-injection structure.