Cascade Chirality Transfer Through Diastereomeric Interaction Enables Efficient Circularly Polarized Electroluminescence,Advanced Functional Materials

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Cascade Chirality Transfer Through Diastereomeric Interaction Enables Efficient Circularly Polarized Electroluminescence
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-02-13 , DOI: 10.1002/adfm.202215179
Zhanxiang Chen ₁ , Manli Huang ₁ , Cheng Zhong ₂ , Xiaosong Cao ₁ , Guohua Xie ₂ , Shaolong Gong ₂ , Chuluo Yang _{1,

2}

Affiliation

Organic light-emitting diodes (OLEDs) with circularly polarized emission can bring a breakthrough innovation in display technologies. However, it remains challenging due to the difficulty in obtaining high efficiency and large dissymmetry factor simultaneously. Herein, it is demonstrated that robust circularly polarized (CP) electroluminescence can be induced by cascade chirality transfer within the emitting layer. Through spectroscopic data and theoretical analysis, the initiation of this chirality transfer process is assigned to diastereomeric interaction. Utilizing this interaction and excellent Förster resonance energy transfer ability to the well-known racemic emitter, CP-OLEDs with an electroluminescence dissymmetry factor (|g_EL|) up to 3.2 × 10⁻³ and high external quantum efficiency (EQE) of 32% are successfully fabricated. These devices also show ultra-low efficiency roll-off at high brightness, with EQE ≥ 20% at 128 000 cd m⁻². This study paves the way for the future development of CP-OLEDs through synergistic materials and device engineering.

中文翻译：

通过非对映体相互作用的级联手性转移可实现高效的圆偏振电致发光

具有圆偏振发射的有机发光二极管 (OLED) 可以带来显示技术的突破性创新。然而，由于难以同时获得高效率和大的不对称因子，它仍然具有挑战性。在此，证明了可以通过发射层内的级联手性转移来诱导稳健的圆偏振 (CP) 电致发光。通过光谱数据和理论分析，这种手性转移过程的起始归因于非对映体相互作用。利用这种相互作用和出色的 Förster 共振能量转移能力到众所周知的外消旋发射体，CP-OLED 的电致发光不对称因子 (| g _EL |) 高达 3.2 × 10 ^-3成功制造了32%的高外量子效率（EQE）。这些器件还在高亮度下表现出超低效率滚降，在 128 000 cd m ⁻²时 EQE ≥ 20% 。这项研究通过协同材料和器件工程为 CP-OLED 的未来发展铺平了道路。

更新日期：2023-02-13

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