journal article·2024-08-05

Construction of Hybrid Long- and Short-Range Charge Transfer Excitations for High-Performance Deep-Blue Electroluminescence with CIEy < 0.04 and EQE > 35%

Jibiao Jin, Mei Chen, He Jiang, Baohua Zhang, Zhiyuan Xie, Wai-Yeung Wong

ACS Materials Letters· Volume 6· Issue 8
Publisher page

Abstract

In this work, a design strategy for deep-blue multiresonance thermally activated delayed fluorescence (MR-TADF) molecules was developed by the fusion of the weak O–B–N MR units and the peripheral modification of strong electron-donating diphenylamino group, resulting in hybrid long- and short-range charge transfer excitation characteristics with accelerated delayed fluorescence properties. As a proof-of-concept molecule, DOBN shows a narrowband deep-blue emission peaking at 438 nm and a small full width at half-maximum (fwhm) of 19 nm as well as a high delayed fluorescence efficiency of 51%. Finally, high external quantum efficiencies (EQEs) and small CIEy chromaticity coordinates were realized in both solution-processed (27.7%, 0.03) and vacuum-evaporated (35.4%, 0.04) hyperfluorescence organic light-emitting diodes (OLEDs) employing DOBN as the emitter. These results demonstrate a feasible molecular design strategy for high-performance deep-blue MR-TADF emitters and represent the state-of-the-art performances of deep-blue OLEDs in terms of EQEs and color coordinates.
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Research context

OpenAlex topics: Organic Light-Emitting Diodes Research · Luminescence and Fluorescent Materials · Lanthanide and Transition Metal Complexes

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Applied Biology and Chemical Technology and Research Institute for Smart Energy, The Hong Kong Polytechnic University, Hung Hom, Hong Kong People’s Republic of China

The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen 518057, People’s Republic of China

Center for Advanced Analytical Science, Guangzhou Key Laboratory of Sensing Materials and Devices, Guangdong Engineering Technology Research Center for Photoelectric Sensing Materials and Devices, and School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, People’s Republic of China

State Key Laboratory of Polymer Physics and Chemistry, Chinese Academy of Sciences Changchun Institute of Applied Chemistry, Changchun 130022, People’s Republic of China

Funding

Guangdong Provincial Department of Science and Technology · Bureau of Education of Guangzhou Municipality · State Key Laboratory of Polymer Physics and Chemistry · Research Grants Council, University Grants Committee · National Key Research and Development Program of China · CAS-Croucher Funding Scheme for Joint Laboratories · Innovation and Technology Commission · National Natural Science Foundation of China · Natural Science Foundation of Guangdong Province · Hong Kong Polytechnic University · Guangzhou Municipality · Research Institute for Smart Energy, Hong Kong Polytechnic University

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