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Extremely low efficiency roll-off of phosphorescent organic light-emitting diodes at high-brightness based on acridine heterocyclic derivatives

Abstract

Three novel host materials, IpCm-PhBzAc (1,3-(4-(12,12-dimethylbenzofuro[3,2-b]acridin-7(12H)-yl)phenyl)-6-isopropyl-4H-chromen-4-one), DpAn-BzAc (2,10-(4-(12,12-dimethylbenzofuro[3,2-b]acridin-7(12H)-yl)phenyl)-10-phenylanthracen-9(10H)-one) and DpTrz-BphBzAc (3,7-(4'-(4,6-diphenyl-1,3,5-triazin-2-yl)-[1,1'-biphenyl]-4-yl)-12,12-dimethyl-7,12-dihy2drobenzofuro[3,2-b]acridine) have been designed and synthesized, and their utilization as host materials for phosphorescent organic light-emitting diodes (PhOLEDs) have been investigated. We have fabricated PhOLEDs using green bis(2-phenylpyridine)iridium(III) acetylacetonate as doped emitters and two hosting schemes, which are the single host system consisting of BzAc derivatives and the cohost system with 1,3-bis(carbazolyl)benzene. We found that the PhOLEDs with co-host system of DpAn-BzAc and DpTrz-BphBzAc achieved CE of 57.1 cd A-1 and 53.0 cd A-1, respectively, with the corresponding efficiency roll-off of only 7.6% and 0.9% at a practical brightness of 5000 cd m-2. The extremely reduced efficiency roll-off for BzAc-based PhOLEDs were attributed to the superior thermal stability and excellent bipolar transport properties, and a small singlet-triplet energy gap also afforded efficient reverse intersystem crossing, thus reducing the triplet density of the host for PhOLEDs.

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Publication details

The article was received on 05 Jun 2018, accepted on 09 Aug 2018 and first published on 11 Aug 2018


Article type: Paper
DOI: 10.1039/C8TC02739K
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Extremely low efficiency roll-off of phosphorescent organic light-emitting diodes at high-brightness based on acridine heterocyclic derivatives

    M. Chen, J. Yang, Z. Ye, S. L. Wang, Z. Tang, G. Chen, Y. Zheng, Y. Shi, B. Wei and W. (. Wong, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC02739K

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