Zhan Hongmei, Wang Yanjie, Li Kuofei, Chen Yuannan, Yi Xiaohu, Bai Keyan, Xie Guohua, Cheng Yanxiang
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China.
Sauvage Center for Molecular Sciences, Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, Department of Chemistry, Wuhan University, Wuhan, China.
Front Chem. 2020 Apr 24;8:332. doi: 10.3389/fchem.2020.00332. eCollection 2020.
Two sets of conjugated polymers with anthraquinone groups as pendant acceptors were designed and synthesized. The acceptor is tethered to an diphenylamine group via a phenylene bridge, constructing a thermally activated delayed fluorescence (TADF) unit, which is embedded into the polymer backbone through its donor fragment, while the backbone is composed of dibenzothiophene--dioxide and 2, 7-fluorene or 2, 7-carbazole groups. The polymers show distinct TADF characteristics, confirmed by transient photoluminescence spectra and theoretical calculations. The carbazole-based polymers exhibit shorter delay lifetimes and lower energy emission relative to the fluorene-based polymers. The non-doped organic light-emitting diodes fabricated via solution processing approach produce efficient red emissions with the wavelengths of 625-646 nm. The carbazole containing polymer with 2% molar content of the TADF unit exhibits the best maximum external quantum efficiency of 13.6% and saturated red electroluminescence with the Commission Internationale de l'Eclairage coordinates of (0.62, 0.37).
设计并合成了两组以蒽醌基团作为侧基受体的共轭聚合物。该受体通过亚苯基桥连接到二苯胺基团上，构建了一个热激活延迟荧光（TADF）单元，该单元通过其供体片段嵌入聚合物主链，而主链由二苯并噻吩 - 二氧化物和2,7 - 芴或2,7 - 咔唑基团组成。聚合物表现出明显的TADF特性，这通过瞬态光致发光光谱和理论计算得到证实。相对于芴基聚合物，咔唑基聚合物表现出更短的延迟寿命和更低的能量发射。通过溶液加工方法制备的非掺杂有机发光二极管产生波长为625 - 646 nm的高效红色发射。含有2%摩尔含量TADF单元的咔唑聚合物表现出最佳的最大外量子效率13.6%以及国际照明委员会坐标为(0.62, 0.37)的饱和红色电致发光。
