二苯胺端基修饰对三并茚基多臂结构共轭大分子激光增益材料体系激光特性的影响  

Effect of structural modifications on the spectral and lasing characteristics of truxene-cored starbursts with/without diphenylamine end-cappers

作　　者：刘城芳 于群 陆婷婷 罗倩 陈硕果 郭子明 刘绪 赖文勇 Cheng-Fang Liu;Qun Yu;Tingting Lu;Qian Luo;Shuoguo Chen;Ziming Guo;Xu Liu;Wen-Yong Lai(State Key Laboratory for Organic Electronics&Information Displays(SKLOEID)&Institute of Advanced Materials(IAM),Nanjing University of Posts&Telecommunications,Nanjing 210023,China;Frontiers Science Center for Flexible Electronics(FSCFE),MIIT Key Laboratory of Flexible Electronics(KLoFE),Northwestern Polytechnical University,Xi’an 710072,China)

机构地区：[1]State Key Laboratory for Organic Electronics&Information Displays(SKLOEID)&Institute of Advanced Materials(IAM),Nanjing University of Posts&Telecommunications,Nanjing 210023,China [2]Frontiers Science Center for Flexible Electronics(FSCFE),MIIT Key Laboratory of Flexible Electronics(KLoFE),Northwestern Polytechnical University,Xi’an 710072,China

出　　处：《Science China Materials》2023年第1期309-318,共10页中国科学（材料科学（英文版）

基　　金：supported by the National Natural Science Foundation of China(21835003,91833304,21422402,21604043,21674050,and 62004106);the National Key Basic Research Program of China(973 Program,2014CB648300 and 2017YFB0404501);the Natural Science Foundation of Jiangsu Province(BK20160888 and BE2019120);the Program for Jiangsu Specially-Appointed Professor(RK030STP15001);the Six Talent Peaks Project of Jiangsu Province(TD-XCL-009);the 333 Project of Jiangsu Province(BRA2017402);the Natural Science Foundation of the Jiangsu Higher Education Institutions of China(20KJB140005);China Postdoctoral Science Foundation(2020M671553);the NUPT“1311 Project”;Scientific Foundation(NY217169,NY215062,NY215107,and NY217087);the Leading Talent of Technological Innovation of National Ten-Thousands Talents Program of China,the Excellent Scientific and Technological Innovative Teams of Jiangsu Higher Education Institutions(TJ217038);the Postgraduate Research&Practice Innovation Program of Jiangsu Province(SJCX21-0297);the Synergetic Innovation Center for Organic Electronics and Information Displays,and the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)。

摘　　要：本文选取三并茚基多臂结构共轭大分子材料TrXD(二苯胺(DPA)端基修饰)和TrX(DPA端基未修饰)为模型分子,系统研究了DPA修饰对三并茚基多臂结构共轭大分子激光增益材料光物理特性和激光增益行为的影响.在多臂结构分子中引入DPA基团可以有效抑制聚集,从而显著降低聚集诱导的发射猝灭,进而提高发光效率.同时,TrXD的辐射衰减速率kr高于TrX,表明DPA修饰有利于增强辐射衰减过程.与TrX相比,TrXD具有较低的放大自发辐射阈值(2.1–4.3μJ cm^(-2)),较高的净增益系数(80–101cm^(-1)),较低的损耗系数(2.6–4.4cm^(-1)).其中,Tr3D具有优异的激光性能,其激光阈值为0.31kW cm^(-2),明显优于Tr3(0.86kW cm^(-2)).研究结果显示,DPA端基修饰的多臂结构分子系统具有作为有机激光增益介质应用的更好潜力,这归因于其更高的辐射衰减速率kr,从而表现出更优异的激光增益特性.This study examined the effect of chemical modifications on the spectral and lasing characteristics of truxene-cored starbursts as gain media for organic lasers.A series of conjugated starburst materials,consisting of a truxene core and oligofluorene bridges with and without diphenylamine(DPA),namely,TrXD and TrX,were assessed as model molecules to investigate the influence of DPA on the photophysical characteristics and organic lasing behaviors.TrXD with DPA could effectively restrain the aggregation and greatly suppress the aggregation-induced emission quenching,yielding high photoluminescence efficiency.A higher radiative decay rate krwas observed for TrXD than for TrX,suggesting that DPA is beneficial for enhancing the radiative decay process.TrXD showed low amplified spontaneous emission thresholds of 2.1-4.3μJ cm^(-2)with high net gain coefficients of80-101 cm^(-1),rather low loss coefficients of 2.6-4.4 cm^(-1),compared with TrX.The best performance with a lasing threshold of 0.31 kW cm^(-2)was obtained for Tr3D,which was superior to that of Tr3(0.86 kW cm^(-2)).The molecular systems with DPA have a large potential as attractive molecules for organic lasers because of the superior lasing properties induced by kr.

关 键 词：放大自发辐射 激光增益 激光特性 激光性能 激光阈值 增益系数 损耗系数 有效抑制 

分 类 号：TG665[金属学及工艺—金属切削加工及机床]