Issue 43, 2012
From the journal:

Journal of Materials Chemistry

Highly efficient and solution-processed iridium complex for single-layer yellow electrophosphorescent diodes

Xinhua Ouyang,a   Dongcheng Chen,b   Shuiming Zeng,a   Xingye Zhang,a   Shijian Su*b  and  Ziyi Ge*a  

* Corresponding authors

a Ningbo Institute of Material Technology and Engineering (NIMTE), Chinese Academy of Sciences (CAS), Ningbo, P. R. China
E-mail: geziyi@nimte.ac.cn

b State Key Laboratory of Luminescent Materials and Devices (South China University of Technology), Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, Guangzhou, P. R. China
E-mail: mssjsu@scut.edu.cn

Abstract

A novel electrophosphorescent material based on a biscyclometalated iridium(III) complex of the N,N-diphenyl-4′′-(1-phenyl-1H-benzo[d]imidazol-2-yl)-[1,1′:4′,1′′-terphenyl]-4-amine ligand, named Ir(TPABPBI)2(acac), has been synthesized and its application in organic light emitting devices (OLEDs) was studied. Highly efficient, solution-processed, single-layer, electrophosphorescent diodes utilizing the complex have been prepared and characterized. In these devices, the high triplet energy poly(9-vinylcarbazole) (PVK) is used as a host polymer doped with 2-(4-biphenylyl)-5-(4-tert-butyl-phenyl)-1,3,4-oxadiazole (PBD) employed for electron transport. When the doping concentration of Ir(TPABPBI)2(acac) is up to 4%, devices with a current efficiency of 30.0 cd A−1 corresponding to an EQE of 15% can thus be achieved, along with the Commission de l'Eclairage 1931 chromaticity coordinates of (0.507, 0.486). More importantly, the yellow phosphorescence can be achieved without the generation of excimer emission. Such devices exhibit a very broad and featureless peak at ca. 568 nm with a wide full spectral width at half maximum (FWHM) of 83 nm. These results render Ir(TPABPBI)2(acac) a promising organic phosphor for applications in yellow OLEDs, especially for large-area, highly efficient and cheap yellow PhOLEDs.

Graphical abstract: Highly efficient and solution-processed iridium complex for single-layer yellow electrophosphorescent diodes

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Article information

DOI
https://doi.org/10.1039/C2JM34462A
Article type
Paper
Submitted
09 Jul 2012
Accepted
07 Sep 2012
First published
10 Sep 2012

J. Mater. Chem., 2012,22, 23005-23011

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Highly efficient and solution-processed iridium complex for single-layer yellow electrophosphorescent diodes

X. Ouyang, D. Chen, S. Zeng, X. Zhang, S. Su and Z. Ge, J. Mater. Chem., 2012, 22, 23005 DOI: 10.1039/C2JM34462A

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