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Indexed by:期刊论文

Date of Publication:2013-09-01

Journal:DYES AND PIGMENTS

Included Journals:SCIE、EI

Volume:98

Issue:3

Page Number:317-322

ISSN No.:0143-7208

Key Words:Iridium complex; 2-Phenylbenzothiazole ligand; Orange; White OLED; Solution-processible; Small molecular host

Abstract:The luminescent properties of two cyclometalated iridium complexes containing 2-phenylbenzothiazole ligand were investigated. With diphenylamino groups in the ligands, these iridium complexes can form neat films by spin coating their solutions. It is also possible to prepare their doped films in small molecular host matrix N,N'-dicarbazolyl-4,4'-biphenyl by spin coating. Partially solution-processed organic light-emitting diodes (OLEDs) were fabricated with a luminance efficiency of 20.18 cd A(-1) (7.81%), which is even higher than the vacuum-deposited device data for these two complexes, and also better than those for other solution-processed iridium dopant/small molecular host systems. The two-element white OLEDs containing these orange phosphors and traditional blue-emitting iridium in N,N'-dicarbazolyl-4,4'-biphenyl host also exhibited high efficiency of 12.39 cd A(-1). It is suggested that the incorporation of the diphenylamino substituents and thus the good hole-injecting and solution processing ability of these iridium complexes are responsible for the good performance. (c) 2013 Elsevier Ltd. All rights reserved.