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초록

Achieving solution-processable circularly polarized organic light-emitting diode (CP-OLED) with high device efficiency and narrowband emission remains a significant challenge. In this study, we propose a proof-of-concept utilizing [2.2]paracyclophane-fused organoboron-nitrogen emitters, synthesized through intramolecular cyclization strategy that incorporates the [2.2]paracyclophane chiral core into the multi-resonance thermally activated delayed fluorescence framework. These molecular systems exhibit short-range charge transfer characteristics, with a narrow full-width at half maximum of 31 nm and exceptionally high emission efficiencies exceeding 92%. Outstanding chiroptical activity is evidenced by photoluminescence dissymmetry factors of 0.7/−1.0 × 10−3 and 1.8/−1.3 × 10−3 for (R)-MR-PCP-CN/(S)-MR-PCP-CN in solution and solid phase, respectively. CP-OLEDs fabricated from solution-processable (R)-MR-PCP-CN/(S)-MR-PCP-CN demonstrate circularly polarized electroluminescence, an external quantum efficiency of 25.2% and an electroluminescence dissymmetry factor of 0.53/−0.47 × 10−3. This is among the few reports on solution-processable CP-OLEDs using PCP-fused organoboron-nitrogen MR-TADF emitters, providing a direction for the advancement of narrowband CP-TADF emitters and solution-processable CP-OLEDs.

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