Planar Chiral Multiple Resonance Thermally Activated Delayed Fluorescence Materials for Efficient Circularly Polarized Electroluminescence
| Autor: | Xiang‐Ji Liao, Dongdong Pu, Li Yuan, Jingjing Tong, Shuai Xing, Zhen‐Long Tu, Jing‐Lin Zuo, Wen‐Hua Zheng, You‐Xuan Zheng |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Angewandte Chemie. 135 |
| ISSN: | 1521-3757 0044-8249 |
| DOI: | 10.1002/ange.202217045 |
| Popis: | Chiral boron/nitrogen doped multiple resonance thermally activated delayed fluorescence (MR-TADF) emitters are promising for highly efficient and color-pure circularly polarized organic light-emitting diodes (CP-OLEDs). Herein, we report two pairs of MR-TADF materials (Czp-tBuCzB, Czp-POAB) based on planar chiral paracyclophane with photoluminescence quantum yields of up to 98%. The enantiomers showed symmetric circularly polarized photoluminescence spectra with dissymmetry factors |gPL| of up to 1.6 × 10-3 in doped films. Meanwhile, the sky-blue CP-OLEDs with (R/S)-Czp-tBuCzB showed an external quantum efficiency of 32.1% with the narrowest full-width at half-maximum of 24 nm among the reported CP-OLEDs, while the devices with (R/S)-Czp-POAB displayed the first nearly pure green CP electroluminescence with |gEL| factors at the 10-3 level. These results demonstrate the incorporation of planar chirality into MR-TADF emitter is a reliable strategy for constructing of efficient CP-OLEDs. |
| Databáze: | OpenAIRE |
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