The Second Excited Triplet‐State Facilitates TADF and Triplet–Triplet Annihilation Photon Upconversion via a Thermally Activated Reverse Internal Conversion
Source abstract
Abstract
Abstract Recent years have seen a surge in organic emitters that exhibit thermally activated delayed fluorescence (TADF) behavior owing to their high exciton utilization efficiency, low biological toxicity, etc. However, the existing TADF channel is insufficiently well developed as to design high‐performance materials especially in the high‐lying triplet state mediated reverse intersystem crossing process. A thermally activated reverse internal conversion (TARIC) pathway is reported here, which can achieve effective population transfer from T1 to T2 states via conical intersection point with the barrier of 3.81 kcal mol−1. On this basis, the mediated T2 state facilitates the TADF and triplet–triplet annihilation photon upconversion (TTA–UC) channel. Furthermore, benefited from the TARIC pathway, the designed 2′,7′‐dichlorofluorescein (DCF) derivative DCF−MPYM−Me photosensitizer presents an excellent upconversion efficiency of 13.6%. The high upconversion efficiency is the best performance in purely organic TADF photosensitizers without heavy atoms in TTA−UC systems.
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Research context
OpenAlex topics: Organic Light-Emitting Diodes Research · Luminescence and Fluorescent Materials · Perovskite Materials and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Institute of Molecular Sciences and Engineering Institute of Frontier and Interdisciplinary Science Shandong University Qingdao Shandong 266237 P. R. China
State Key Laboratory of Fine Chemicals School of Chemical Engineering Dalian University of Technology Dalian 116024 P. R. China
Qingdao Institute of Theoretical and Computational Science Institute of Frontier and Interdisciplinary Sciences Shandong University Qingdao Shandong 266237 P. R. China
Key Laboratory of Industrial Ecology and Environmental Engineering (MOE) School of Environmental Science and Technology Dalian University of Technology Dalian 116024 P. R. China
Division of Advanced Manufacturing Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen 518055 P. R. China
State Key Lab of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 P. R. China
Funding
National Key Research and Development Program of China · National Science Fund for Distinguished Young Scholars · National Natural Science Foundation of China
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