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tert-Butyl substituted hetero-donor TADF compounds for efficient solution-processed non-doped blue OLEDs

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Abstract

For the development of solution-processed organic light-emitting diodes (OLEDs), it is highly desirable yet challenging to realize solution-processable non-doped thermally activated delayed fluorescence (TADF) emitters due to their high efficiency and excellent compatibility to the wet methods. Herein, two pairs of blue TADF isomers are designed and synthesized with a hetero-donor configuration for the realization of high photoluminescent quantum yield. The incorporation of two tert-butyl groups in the molecules can effectively increase the molecular solubility and reduce the aggregation-caused self-quenching of excitons in neat films by inhibiting the intramolecular vibrational relaxation and the intermolecular π–π stacking. Solution-processed non-doped OLEDs are achieved with these blue TADF emitters, exhibiting the record-high external quantum efficiencies (EQE) of 25.8%. Furthermore, an all-TADF white OLED with an EQE of 27.3% is also achieved by employing a single emitting layer with the blue TADF emitter as a host for an orange-red TADF dopant.

Graphical abstract: tert-Butyl substituted hetero-donor TADF compounds for efficient solution-processed non-doped blue OLEDs

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Article information


Submitted
12 Feb 2020
Accepted
16 Mar 2020
First published
17 Mar 2020

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

tert-Butyl substituted hetero-donor TADF compounds for efficient solution-processed non-doped blue OLEDs

F. Xie, Z. An, M. Xie, Y. Li, G. Zhang, S. Zou, L. Chen, J. Chen, T. Cheng and J. Tang, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/D0TC00718H

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