journal article·2025-07-07

Unveiling and Refining an Interfacial-Resonant Exciplex for Ultrathin Emitters in High-Efficiency Organic Light-Emitting Diodes

Mingkai Shi, Jikuan Du, Bo Zhao, Baoyou Liu, Gang Yue, Hua Wang, Yuying Hao, Yanqin Miao, Kunping Guo

ACS Materials Letters· Volume 7· Issue 7
Publisher page

Abstract

Here, an interfacial resonant exciplex (IRE) composed of 3,3′-di(9H-carbazol-9-yl)-1,1′-biphenyl (mCBP) as a donor and 1,3,5-tri[(3-pyridyl)-phen-3-yl]benzene (TmPyPB) as an acceptor is proposed. The mCBP/TmPyPB IRE serves as a host in a nondoped ultrathin emissive layer structure, offering distinct advantages over conventional single-host and cohost systems in organic light-emitting diodes (OLEDs) based on 10-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-9,9-dimethyl-9,10-dihydroacridine (DMAC-TRZ). A comparative investigation with well-studied thermally activated delayed fluorescence-enabled mCBP/PO-T2T and conventional mCBP/TPBi exciplexes demonstrates that using an IRE host with a DMAC-TRZ emitter enhances efficient Förster energy transfer from the S 1 state of mCBP/TmPyPB to DMAC-TRZ, while simultaneously suppressing exciton losses from the T 1 state of the IRE host to the emitter due to the exceptionally small energy gap (0.01 eV). As a consequence, the mCBP/TmPyPB IRE-based OLED achieves a state-of-the-art maximum external quantum efficiency approaching 20%, substantially outperforming reference exciplex devices. This work reveals the critical role of modulating energy transfer dynamics in interfacial exciplexes, paving a new pathway toward highly efficient OLEDs.
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Research context

OpenAlex topics: Organic Light-Emitting Diodes Research · Organic Electronics and Photovoltaics · Luminescence and Fluorescent Materials

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

Affiliations

Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education

Taiyuan University of Technology

Ningxia Hui Autonomous Region Screen Display Organic Materials Engineering Technology Research Center

Ningxia Sinostar Display Material Co., Ltd.

School of Physics and Optoelectronic Engineering, College of Physics and Optoelectronics Engineering, Shanxi Key Lab of Photovoltaic Technology and Application

School of Electronic Information and Artificial Intelligence

Shaanxi University of Science and Technology

Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany

Funding

Shaanxi University of Science and Technology · Science and Technology Innovation Group of Shanxi Province · Education Department of Shaanxi Province · China Scholarship Council · National Natural Science Foundation of China · Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province · NSFC-Joint Foundation Program for Regional Innovation and Development · Development Fund in Science and Technology of Shanxi Province

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