Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 22, Issue 4, Pages 1411-1417Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm13846d
Keywords
-
Funding
- National Natural Science Foundation of China [20923006, 21072026, 20704002]
- Ministry of Education for the New Century Excellent Talents in University [NCET-08-0074]
- NKBRSF [2009CB220009]
- Fundamental Research Funds for the Central Universities [DUT10LK16]
Ask authors/readers for more resources
Two homoleptic and heteroleptic cyclometalated iridium complexes containing the 2-phenylbenzothiozole derivative as the main ligand, 1 and 2, have been synthesized and characterized as efficient orange-red phosphors. Triarylamine was introduced as an important substituent into the 6-position of the benzothiazole ring to tune the photonic and electronic properties of these complexes. Different from most of small molecular iridium complexes, 1 and 2 are solution-processable and their neat films can be obtained by a spin-coating method. Furthermore, their homogeneously dispersed films in a small molecular matrix, 4,4'-N,N'-dicarbazolebiphenyl (CBP), were successfully prepared by solution method even with low doping levels. Organic light-emitting diodes (OLEDs) were fabricated by solution processing the emitting layer containing 1 and 2 as doped emitters in the CBP host. Efficient orange-red electroluminescence by using 5 wt% 2 as the dopant was realized with a maximum efficiency of 14.49 cd A(-1) (7.38 lm W-1 and 8.73%) and Commission Internationale de l'Eclairage (CIE) coordinates of (0.60, 0.40), which are among the highest luminance efficiency ever reported for partially solution-processed red and orange-red OLEDs so far. In addition, two-element white OLEDs were achieved with these orange-red phosphors and the traditional blue emitter by spin coating the emission layer. A maximum luminance efficiency of 8.97 cd A(-1) and CIE of (0.33, 0.35) were realized.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available