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Nondoped Organic Light-Emitting Diodes with Low Efficiency Roll-Off: Combination of Aggregation-Induced Emission, Hybridized Local and Charge-Transfer State as well as High Photoluminescence Efficiency

Abstract

In this work, two isomers namely 2P-BT-N-2TPA and 2TPA-BT-N-2P have been designed and synthesized with hybridized local and charge transfer (HLCT) properties. The 2TPA-BT-N-2P has been found to have not only stronger intra/intermolecular interactions with regular molecular packing which stabilized the excited state configuration, but also aggregation-induced emission enhancement (AIEE) properties. The AIEE properties can effectively inhibit aggregation caused quenching (ACQ) effect in the aggregation state and its photoluminescence quantum yield (PLQY) up to 91%, which is extremely high in solid-state film. When 2TPA-BT-N-2P is applied as a dopant to form a doped OLED, the device has excellent external quantum efficiency (EQE) of 6.6% with an emission peak of 588 nm. Moreover, when 2TPA-BT-N-2P is applied as a pure emitting layer to form a non-doped OLED, the device still achieved EQE of 5.8% and 5.1% at 100 cd/m2 and 1000 cd/m2, respectively, with the lowest efficiency roll-off currently reported from HLCT molecule in orange emission.

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Supplementary files

Article information


Submitted
25 Nov 2019
Accepted
11 Jan 2020
First published
13 Jan 2020

J. Mater. Chem. C, 2020, Accepted Manuscript
Article type
Paper

Nondoped Organic Light-Emitting Diodes with Low Efficiency Roll-Off: Combination of Aggregation-Induced Emission, Hybridized Local and Charge-Transfer State as well as High Photoluminescence Efficiency

S. Yang, Y. Zhang, A. K. Mohmand, Y. Yu, S. Kumar, Z. Jiang and L. Liao, J. Mater. Chem. C, 2020, Accepted Manuscript , DOI: 10.1039/C9TC06444C

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