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Stable and efficient phosphorescent organic light-emitting device utilizing a δ-carboline-containing host displaying thermally activated delayed fluorescence

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Abstract

Materials displaying thermally activated delayed fluorescence (TADF) can when used as hosts alleviate the serious efficiency roll-off of phosphorescent organic light-emitting devices (PHOLEDs). However, the stability of the device remains challenging due to the unstable moiety in the TADF molecule. Here, a stable and efficient yellow PHOLED based on a δ-carboline-containing TADF host and bis(4-phenyl-thieno[3,2-c]pyridinato-C2′) (acetylacetonato) iridium(III) (PO-01) guest was demonstrated. Compared to the lifetime of the PHOLED with a 4,4′-bis(N-carbazolyl)-2,2′-biphenyl host, a greater than twenty times enhancement of the lifetime of the PO-01-based device was achieved. The LT50 lifetime (time to 50% of initial luminance of 1000 cd m−2) of an unpackaged DCb-BPP-based PHOLED reached 424 h, and was accompanied by a maximum external quantum efficiency of 21.5% and an impressive low efficiency roll-off of 17.7% at a high luminance of 10 000 cd m−2. These values are among the best of those reported for PO-01-based yellow PHOLEDs.

Graphical abstract: Stable and efficient phosphorescent organic light-emitting device utilizing a δ-carboline-containing host displaying thermally activated delayed fluorescence

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Supplementary files

Article information


Submitted
03 Dec 2019
Accepted
03 Feb 2020
First published
03 Feb 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Stable and efficient phosphorescent organic light-emitting device utilizing a δ-carboline-containing host displaying thermally activated delayed fluorescence

H. Wang, H. Zhao, C. Zang, S. Liu, L. Zhang and W. Xie, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/C9TC06601B

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