Synthesis and photophysical properties of a new blue-light emitting material with AIEE effect  

具有AIEE效应的新型蓝光材料的合成及性质研究

作　　者：LIU Nan DU Bin YU Wenxuan DAI Guangfu 刘楠;杜斌;喻文轩;代广富(中北大学化学与化工学院,山西太原030051)

机构地区：[1]Schoo of Chemistry and Chemical Engineering,North Uniersity of China,Taiyuan 030051,Shanxi,China

出　　处：《化学研究》2025年第1期49-56,共8页Chemical Research

基　　金：Fundamental Research Program of Shanxi Province(20210302124637,202203021211102,J20230701)。

摘　　要：Blue-light emitting materials with high purity and good luminous efficiency have attracted considerable attention from both academic and commercial researchers for their great potential use in OLEDs.In order to improve thermal stability and lower the possibility to generate fluorescence quenching of organic blue-light emitting materials formed by carbazole,a linear organic molecule containing carbazole and triarylamine group,named N4,N4’-bis(9-ethyl-9H-carbazol-3-yl)-N4,N4’-diphenyl-[1,1’-biphenyl]-4,4’-diamine(DPECB),was synthesized via the Buchwald-Hartwig reaction.The structure of DPECB was characterized by nuclear magnetic resonance(NMR)and infrared spectroscopy.The UV-Vis absorption spectrum shows that DPECB exhibits two strong absorption peaks in the near ultraviolet region(around 305 and 355 nm).The fluorescence emission spectrum indicates that DPECB displays blue light emission both in solution(428-445 nm)and solid-state(466 nm).Additionally,DPECB shows clearly aggregation-induced emission enhancement(AIEE)effect in the mixed solvent of DMF/H2O.As the thermogravimetric analysis shows,DPECB demonstrates excellent thermostability with a 5%decomposition temperature of 457℃owing to the introduction of triarylamine group.The electrochemical property of DPECB was studied through cyclic voltammetry,and its HOMO and LUMO energy levels are-5.27 and-2.25 eV,respectively.These results indicate that DPECB is a promising blue-light emitting material with potential commercial applications.纯度高、发光效率良好的蓝光发射材料在有机电致发光器件中具有重要应用,一直是人们研究的重点。基于咔唑良好的电子传输能力和给电子效应,结合三芳胺的螺旋状结构,通过Buchwald-Hartwig偶联等反应合成了一种含有咔唑和芳胺基团的线性有机分子N,N’-二苯基-N,N’-二(N-乙基咔唑)-4,4’-联苯二胺(DPECB),采用核磁共振波谱和红外光谱对其结构进行了表征,并通过紫外-可见吸收光谱、荧光发射光谱等对其光物理性质、电化学性质和稳定性进行了研究。结果表明,该化合物合成方法简单高效,发射波长在428~445 nm范围内,HOMO和LUMO能级分别为-5.27和-2.25 eV,具有优异的AIEE蓝光发射性能;热稳定性优异,5%失重温度为457℃,是一种具有潜在商业应用价值的蓝光材料。

关 键 词：blue-light emitting material CARBAZOLE TRIARYLAMINE aggregation-induced emission enhancement 

分 类 号：O622.6[理学—有机化学]