Issue 41, 2016

High-brightness solution-processed phosphorescent OLEDs with pyrimidine-based iridium(iii) complexes

Abstract

Two heteroleptic cyclometalated iridium(III) complexes, Ir(ppm)2(pic) and Ir(ppm)2(taz), using 4,6-diphenyl pyrimidine (Hppm) as a cyclometalating ligand, were successfully synthesized and characterized. Strong emission at 555 and 532 nm with high photoluminescence quantum yields of 83% and 86% in PMMA at 298 k were obtained for Ir(ppm)2(pic) and Ir(ppm)2(taz), respectively. Solution-processed organic light-emitting diodes (OLEDs) based on Ir(ppm)2(pic) and Ir(ppm)2(taz) showed high-brightness of 112 233 and 125 072 cd m−2, peak current efficiencies of 30.6 and 40.4 cd A−1 and maximum external quantum efficiencies of 10.4 and 17.3%, respectively, accompanied by very low efficiency roll-off values. The ancillary ligand taz tuned the emission to saturated green, and more importantly, it can significantly increase the spectral stability and device efficiency.

Graphical abstract: High-brightness solution-processed phosphorescent OLEDs with pyrimidine-based iridium(iii) complexes

Supplementary files

Article information

Article type
Paper
Submitted
10 Feb 2016
Accepted
23 Mar 2016
First published
11 Apr 2016

RSC Adv., 2016,6, 34970-34976

High-brightness solution-processed phosphorescent OLEDs with pyrimidine-based iridium(III) complexes

B. Tong, Q. Mei, R. Tian, M. Yang, Q. Hua, Y. Shi and S. Ye, RSC Adv., 2016, 6, 34970 DOI: 10.1039/C5RA28134B

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