Issue 47, 2015

A wet- and dry-process feasible carbazole type host for highly efficient phosphorescent OLEDs

Abstract

A wet- and dry-process feasible host material is crucial to realize, respectively, low cost roll-to-roll fabrication of large area and high performance organic light-emitting diodes (OLEDs) with precise deposition of organic layers. We demonstrate in this study high efficiency phosphorescent OLED devices by employing a newly synthesized carbazole based host material 1,6-bis[3-(2-methoxy-3-pyridinyl)carbazol-9-yl]hexane (compound 5). Moreover, two other carbazole hosts 1,6-bis[3-(6-methoxy-3-pyridinyl)carbazol-9-yl]hexane (compound 4) and 3,6-di(2-methoxy-3-pyridinyl)-9-ethylcarbazole (compound 6) are also synthesized for comparison. By doping a typical green emitter fac tris(2-phenylpyridine)iridium (Ir(ppy)3) in compound 5, for example, the resultant wet-processed device exhibits at 100 cd m−2 a current efficiency of 27 cd A−1 and a power efficiency of 16.1 lm W−1. The dry-processed device shows a current efficiency of 61 cd A−1 and a power efficiency of 62.8 lm W−1. The high efficiency may be attributed to the host possessing an effective host-to-guest energy transfer, effective carrier injection balance, and the device architecture enabling excitons to generate on both the host and the guest.

Graphical abstract: A wet- and dry-process feasible carbazole type host for highly efficient phosphorescent OLEDs

Supplementary files

Article information

Article type
Paper
Submitted
13 Sep 2015
Accepted
04 Nov 2015
First published
05 Nov 2015

J. Mater. Chem. C, 2015,3, 12297-12307

A wet- and dry-process feasible carbazole type host for highly efficient phosphorescent OLEDs

J. Jou, S. Sahoo, S. Kumar, H. Yu, P. Fang, M. Singh, G. Krucaite, D. Volyniuk, J. V. Grazulevicius and S. Grigalevicius, J. Mater. Chem. C, 2015, 3, 12297 DOI: 10.1039/C5TC02889B

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