Horizontally oriented MRCT-type TADF emitter achieving EQE over 40% for Sky-Blue OLED

Debasish Barman, Youichi Tsuchiya and Chihaya Adachi ()
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Debasish Barman: Kyushu University
Youichi Tsuchiya: Kyushu University
Chihaya Adachi: Kyushu University

Nature Communications, 2025, vol. 16, issue 1, 1-16

Abstract: Abstract Blue emission is crucial for quality white lighting sources. Delving into precise exciton management in the subtle chemical design using organic materials and understanding key insights into organic light-emitting diode efficiency is of prime importance. Herein, we envision a simple design strategy combining short-range charge transfer with main long-range charge transfer and synchronizing their complementary advantages to afford a new paradigm of multi-resonance charge transfer-type thermally activated delayed fluorescence emitters. Modifying the auxiliary push-pull connection between a carbazole donor and a boron-based acceptor core, we construct C-C bond extended DBACzPh and DBADCzPh emitters with strong thermally activated delayed fluorescence emission in solution and thin films. Preferential 100% horizontal molecular orientation results in balanced bipolar carrier transport and effective host-to-dopant energy transfer in a high-polarity host matrix. Thereby, DBADCzPh significantly boosts outcoupling efficiency. This design achieves sky-blue electroluminescence with a very high external quantum efficiency of over 40%, paving the way for future advancements in emitter designs for high-efficiency OLEDs.

Date: 2025
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DOI: 10.1038/s41467-025-59893-x

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