Abstract
AbstractPreparing high-efficiency solution-processable orange-red thermally activated delayed fluorescence (TADF) emitters remains challenging. Herein, we design a series of emitters consisting of trinaphtho[3,3,3]propellane (TNP) core derivatized with different TADF units. Benefiting from the unique hexagonal stacking architecture of TNPs, TADF units are thus kept in the cavities between two TNPs, which decrease concentration quenching and annihilation of long-lived triplet excitons. According to the molecular engineering of TADF and host units, the excited states can further be regulated to effectively enhance spin-orbit coupling (SOC) processes. We observe a high-efficiency orange-red emission at 604 nm in one instance with high SOC value of 0.862 cm−1 and high photoluminescence quantum yield of 70.9%. Solution-processable organic light-emitting diodes exhibit a maximum external quantum efficiency of 24.74%. This study provides a universal strategy for designing high-performance TADF emitters through molecular packing and excited state regulation.
Funder
Natural Science Foundation of Shandong Province
National Natural Science Foundation of China
Publisher
Springer Science and Business Media LLC
Subject
General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry,Multidisciplinary
Reference63 articles.
1. Liu, Y. C., Li, C. S., Ren, Z. J., Yan, S. K. & Bryce, M. R. All-organic thermally activated delayed fluorescence materials for organic light-emitting diodes. Nat. Rev. Mater. 3, 18020 (2018).
2. Bian, J. et al. Ambipolar self-host functionalization accelerates blue multi-resonance thermally activated delayed fluorescence with internal quantum efficiency of 100%. Adv. Mater. 34, 2110547 (2022).
3. Cai, X. et al. Achieving 37.1% green electroluminescent efficiency and 0.09 eV full width at half maximum based on a ternary boron-oxygen-nitrogen embedded polycyclic aromatic system. Angew. Chem. Int. Ed. Engl. 61, e202200337 (2022).
4. Peng X. M. et al. Synergetic horizontal dipole orientation induction for highly efficient and spectral stable thermally activated delayed fluorescence white organic light-emitting diodes. Adv. Funct. Mater. 32, 2203022 (2022).
5. Li, C. et al. Asymmetrical-dendronized TADF emitters for efficient non-doped solution-processed OLEDs by eliminating degenerate excited states and creating solely thermal equilibrium routes. Angew. Chem. Int. Ed. Engl. 61, e202115140 (2022).
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