Chiral TADF Polymers Realizing Highly-Efficient Deep-Red Circularly Polarized Electroluminescence Over 660 nm,Advanced Optical Materials

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Chiral TADF Polymers Realizing Highly-Efficient Deep-Red Circularly Polarized Electroluminescence Over 660 nm
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2023-05-08 , DOI: 10.1002/adom.202300550
Jin‐Ming Teng _{1,

2} , Chuan‐Feng Chen _{1,

2}

Affiliation

Circularly polarized electroluminescence (CPEL) from thermally activated delayed fluorescence (TADF) emitters have been widely reported in recent years. However, a universal strategy for designing deep-red chiral TADF emitters is still unexplored. Herein, to address the problem, a pair of chiral donor intermediates are designed and synthesized for preparing deep-red chiral TADF emitters, and two novel chiral TADF polymers R-P and S-P are developed through this strategy. The polymers exhibit intense mirror-image circularly polarized luminescence (CPL) signals in toluene dilute solution. Besides, a series of solution-processed circularly polarized polymer light-emitting diode (CP-PLED) devices are fabricated with R-P and S-P. The corresponding devices achieve persuasive performance with external quantum efficiencies (EQEs) of 6.2% and 5.8% at the wavelength of 662 nm, respectively. Besides, mirror-image CPEL signals are detected with electroluminescence dissymmetry factors (gEL) of +1.6 × 10⁻³ and −1.7 × 10⁻³ from the corresponding CP-PLED devices, respectively.

中文翻译：

手性 TADF 聚合物实现 660 nm 范围内的高效深红色圆偏振电致发光

近年来，热激活延迟荧光（TADF）发射器的圆偏振电致发光（CPEL）已被广泛报道。然而，设计深红色手性 TADF 发射体的通用策略尚未探索。为了解决这个问题，设计并合成了一对手性供体中间体来制备深红色手性TADF发光体，并通过该策略开发了两种新型手性TADF聚合物RP和SP 。该聚合物在甲苯稀溶液中表现出强烈的镜像圆偏振发光（CPL）信号。此外，利用RP和SP制备了一系列溶液加工的圆偏振聚合物发光二极管（CP-PLED）器件。相应的器件在 662 nm 波长下实现了令人信服的性能，外量子效率 (EQE) 分别为 6.2% 和 5.8%。此外，从相应的CP-PLED器件中分别检测到电致发光不对称因子（gEL）为+1.6 × 10 ^-3和-1.7 × 10 ^{-3的镜像CPEL信号。}

更新日期：2023-05-08

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