Donor–Acceptor Type Pendant Conjugated Molecules Based on a Triazine Center with Depressed Intramolecular Charge Transfer Characteristics as Gain Media for Organic Semiconductor Lasers
作者:Xu Liu、Ming Sang、He Lin、Chengfang Liu、Jialing Zhang、Jianpeng Yi、Kun Gao、Wen‐Yong Lai、Wei Huang
DOI:10.1002/chem.201904548
日期:2020.3.9
A set of fluorene‐capped pendant conjugated molecules (T‐m and T‐p), which consist of a triazine center with three carbazole substituents as the donor–acceptor (D‐A) type pendant structure, were designed, synthesized, and investigated as gain media for organic semiconductor lasers (OSLs). In particular, varying the capping positions of the fluorene units on the pendant core structures results in significantly
设计,合成和研究了一套由芴封端的侧链共轭分子(T-m和T-p),该分子由具有三个咔唑取代基的三嗪中心作为供体-受体(D-A)型侧链结构组成。作为有机半导体激光器(OSL)的增益介质。特别是,改变侧链结构上芴单元的封端位置会导致分子内电荷转移(ICT)特性发生显着不同,其中T-m表现出较低的ICT特性和较高的荧光量子产率。纯膜的最低扩增自发发射(ASE)阈值对于T-m记录为1.9μJcm -2,对于T-m记录为83.8μJcm -2。T-p,表明T-m情况下ICT特性的下降有助于增强ASE特性。值得注意的是,ASE阈值几乎保持不变,并且ASE薄膜样品在露天中退火至180°C时,T-m的漂移很小(在1 nm以内)。相反,在高于100°C的退火温度下,其线性对应物2FEtCz-m显示出明显提高的ASE阈值。结果表明,具有降低的ICT特性的共轭侧链分子的选择性构建有利于精细调节光学和电学性质,以及