深圳大学材料科学与工程学院Chuluo Yang研究小组近日取得一项新成果。经过不懈努力，他们开发出窄带发射热激活延迟荧光（TADF）共轭聚合物，并用其在溶液中高效制备了有机发光二极管（OLED）。该项研究成果发表在2022年9月19日出版的《德国应用化学》上。

在该研究中，通过在聚咔唑骨架上附加多共振（MR）诱导发射基团，研究组制备了具有窄带发射特性的TADF共轭聚合物。得到的共轭聚合物表现出典型的TADF特性，其半峰宽（FWHMs）为33-43 nm，具有窄带发射特性。采用这些聚合物作为发射层的溶液制备器件实现了优异的性能，最大外量子效率（EQE）为17.5%，发射峰为496 nm，半峰宽为34 nm。

据了解，传统的热激活延迟荧光（TADF）共轭聚合物由于结构弛豫大导致发射光谱较宽，而这对高质量有机发光二极管（OLED）显示器来说是不希望看到的。

附：英文原文

Title: Narrowband Emissive TADF Conjugated Polymers towards Highly Efficient Solution-Processible OLEDs

Author: Tao Wang, Yang Zou, Zhongyan Huang, Nengquan Li, Jingsheng Miao, Chuluo Yang

Issue&Volume: 2022-09-19

Abstract: Thermally activated delayed fluorescence (TADF) conjugated polymers usually show broad emission spectra due to the large structure relaxation, which is not desirable for high-quality organic light-emitting diode (OLED) displays. Herein, through attaching multiple resonance (MR) induced emitting moiety as pendant onto the polycarbazole backbone, TADF conjugated polymers with narrowband emission are demonstrated. The obtained conjugated polymers exhibit typical TADF characteristics with narrowband emission with full-width at half-maximums (FWHMs) of 33-43 nm. The solution-processed devices employing these polymers as emissive layers realize excellent performances with maximum external quantum efficiency (EQE) of 17.5%, emission peak at 496 nm and FWHM of 34 nm.

DOI: 10.1002/anie.202211172

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202211172