Recently, circularly polarized organic light-emitting diodes (CP-OLEDs) fabricated with thermally activated delayed fluorescence (TADF) emitters are developed rapidly. However, most devices are fabricated by vacuum deposition technology, and developing efficient solution-processed CP-OLEDs, especially nondoped devices, is still a challenge. Herein, a pair of triptycene-based enantiomers, (S,S)-/(R,R)-TpAc-TRZ, are synthesized. The novel chiral triptycene scaffold of enantiomers avoids their intermolecular π–π stacking, which is conducive to their aggregation-induced emission characteristics and high photoluminescence quantum yield of 85% in the solid state. Moreover, the triptycene-based enantiomers exhibit efficient TADF activities with a small singlet-triplet energy gap (ΔE_ST) of 0.03 eV and delayed fluorescence lifetime of 1.1 µs, as well as intense circularly polarized luminescence with dissymmetry factors (|g_PL|) of about 1.9 × 10⁻³. The solution-processed nondoped CP-OLEDs based on (S,S)-/(R,R)-TpAc-TRZ not only display obvious circularly polarized electroluminescence signals with g_EL values of +1.5 × 10⁻³ and −2.0 × 10⁻³, respectively, but also achieve high efficiencies with external quantum, current, and power efficiency up to 25.5%, 88.6 cd A⁻¹, and 95.9 lm W⁻¹, respectively.

中文翻译：

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具有基于手性三萜支架的 TADF 发射器的高性能溶液处理非掺杂圆偏振 OLED 实现超过 20% 的外部量子效率

最近，由热激活延迟荧光 (TADF) 发射器制造的圆偏振有机发光二极管 (CP-OLED) 得到迅速发展。然而，大多数器件是通过真空沉积技术制造的，开发高效的溶液处理 CP-OLED，尤其是无掺杂器件仍然是一个挑战。在此，一对三苯乙烯基对映异构体，( S , S )-/( R , R)-TpAc-TRZ, 合成。对映异构体的新型手性三苯乙烯支架避免了它们的分子间 π-π 堆积，这有利于它们的聚集诱导发射特性和固态下 85% 的高光致发光量子产率。此外，基于三苯乙烯的对映体表现出有效的 TADF 活性，具有0.03 eV的小单线态-三线态能隙 (Δ E _ST ) 和 1.1 µs 的延迟荧光寿命，以及具有不对称因子的强圆偏振发光 (| g _PL | ) 约 1.9 × 10 ^-3。基于( S , S )-/( R , R)-TpAc-TRZ 不仅显示出明显的圆偏振电致发光信号，g _EL值分别为 +1.5 × 10 ^-3和 -2.0 × 10 ^-3，而且外量子效率、电流效率和功率效率高达分别为 25.5%、88.6 cd A ^-1和 95.9 lm W ^-1。