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High efficiency and low efficiency roll-off hole-transporting layer-free solution-processed fluorescent NIR-OLEDs based on oligothiophene–benzothiadiazole derivatives

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Abstract

We report on simple low band-gap D–A–D type chromophores comprising triphylamine as a donor and oligothiophene–benzothiadiazoles as an acceptor. In the solid state, they exhibited strong near-infrared (NIR) emission with high fluorescence quantum yield when doped in the CBP host and low lying HOMO levels suitable for hole-transporting NIR fluorescent emitters for organic light-emitting diodes (OLEDs). Simple hole-transporting layer free solution-processed double-layer OLEDs (ITO/PEDOT:PSS (40 nm)/EML (60 nm)/TPBi (35 nm)/LiF (0.5 nm):Al (150 nm)) demonstrated NIR emission (702–758 nm) with an excellent maximum EQE of 1.52%, low efficiency roll-off and high maximum radiance of 4463 mW Sr−1 m−2, which is amongst the best performance for NIR-OLEDs based on organic fluorescent materials.

Graphical abstract: High efficiency and low efficiency roll-off hole-transporting layer-free solution-processed fluorescent NIR-OLEDs based on oligothiophene–benzothiadiazole derivatives

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Article information


Submitted
26 Jan 2020
Accepted
11 Mar 2020
First published
12 Mar 2020

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

High efficiency and low efficiency roll-off hole-transporting layer-free solution-processed fluorescent NIR-OLEDs based on oligothiophene–benzothiadiazole derivatives

T. Sudyoadsuk, P. Chasing, T. Kaewpuang, T. Manyum, C. Chaiwai, S. Namuangruk and V. Promarak, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/D0TC00450B

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