journal article·2021-10-20

Two-Channel Space Charge Transfer-Induced Thermally Activated Delayed Fluorescent Materials for Efficient OLEDs with Low Efficiency Roll-Off

Ruifang Wang, Zhiyi Li, Taiping Hu, Lei Tian, Xiaoxiao Hu, Shihao Liu, Chen Cao, Ze-Lin Zhu, Ji-Hua Tan, Yuanping Yi, Pengfei Wang, Chun-Sing Lee, Ying Wang

ACS Applied Materials & Interfaces· Volume 13· Issue 41
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Abstract

Enhancing the reverse intersystem crossing (RISC) process of thermally activated delayed fluorescent (TADF) emitters is an effective approach to realize efficient organic light-emitting diodes (OLEDs) with low efficiency roll-off. In this work, we designed two novel TADF emitters, SAT-DAC and SATX-DAC, via a spiro architecture. Efficient maximum external quantum efficiencies (EQEs) of 22.6 and 20.9% with reduced efficiency roll-off (EQEs of 17.9 and 17.0% at 1000 cd m–2) were achieved via a “two-RISC-channel” strategy. X-ray diffraction shows close donor (D)/acceptor (A) spacing and suitable D/A orientation in crystals of the two emitters favoring both intra- and intermolecular through-space charge transfer (TSCT) processes. Transient photoluminescence decay measurements show that both emitters have two RISC channels leading to kISCT exceeding 106 s–1. These results suggest that the “two-RISC-channel” design can be a novel approach for enhancing performance of TADF emitters, in particular at high excitation densities.
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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 Photochemical Conversion and Optoelectronic Materials, and TIPC-CityU Joint Laboratory of Functional Materials and Device, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China

Center of Super-Diamond and Advanced Films (COSDAF), Department of Chemistry, City University of Hong Kong, Hong Kong SAR 999077, P. R. China

University of Chinese Academy of Sciences, Beijing 100049, P. R. China

Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China

Funding

Research Grants Council, University Grants Committee · Ministry of Science and Technology of the People's Republic of China · National Natural Science Foundation of China · Central Committee of the Communist Party of China · National Program for Support of Top-notch Young Professionals

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