摘要
设计合成了三种基于咔唑的具有A-π-D-π-A结构的有机小分子发光材料M1~M3,并用红外光谱、核磁共振谱、元素分析对其结构进行了表征。通过紫外-可见(UV-Vis)光谱、荧光光谱、循环伏安法、热重分析(TGA)对其光物理性质进行了研究。结果表明,M1~M3在CH2Cl2稀溶液中均在约350、465 nm处出现两个吸收峰,其最大吸收波长均位于约465 nm处,并具有良好的溶解性和溶液成膜性。M1、M2和M3在CH2Cl2稀溶液中均发射黄色荧光,发射峰均在575 nm左右;在固体状态下,荧光发射峰均发生显著紅移,荧光发射峰分别位于633、662和685 nm,均发射红色荧光;其最高已占轨道(HOMO)能级分别为-5.29、-5.24和-5.33 eV,与阳极氧化铟锡(ITO)的功函(-4.8^-5.0 eV)相匹配,表现出良好的空穴传输性能;其热分解温度分别为224、307和320℃,热稳定性优良。
Three new organic luminescent materials with A-π-D-π-A structure based on carbazole,M1~M3,were designed and synthesized.Their structure were characterized by FT-IR,1H NMR and 13C NMR.Photophysical properties and energy-level structure of M1~M3 were studied by ultraviolet-visible(UV-Vis)absorption spectroscopy,fluorescence spectroscopy,cyclic voltammetry(CV)and thermogravimetric analysis.The results showed that the absorption wavelength of M1,M2 and M3 are located at 350 and 465 nm in dilute CH2Cl2 solution,the maximum absorption wavelengths are all located at about 465 nm,and M1~M3 possess good solubility and film-forming property.Their emission wavelengths are located at about 575 nm while all three emit yellow photofluorescence in dilute CH2Cl2 solution.However,the emission wavelengths of M1,M2 and M3 are located at 633,662 and 685 nm in solid state thin film,respectively,and all three emit red fluorescence.CV measurement showed that highest occupied molecular orbital(HOMO)energy levels of M1,M2 and M3 are located at-5.29,-5.24 and-5.33 eV,respectively,which match with the energy level of indium tin oxide(ITO)(-4.8^-5.0 eV)so as to demonstrate that they possess good hole transport properties.The decomposition temperatures(Td)of M1~M3 are 224,307 and 320℃,respectively,which show that they all have good thermal stability.
作者
周家宏
吴平
张正垠
魏怀鑫
张强
赵鑫
Zhou Jiahong;Wu Ping;Zhang Zhengyin;Wei H uaixin;Zhang Qiang;Zhao Xin(School o f Chemistry,Biology and Material Engineering,Suzhou University of Science and Technology,Suzhou,Jiangsu,215009,China)
出处
《化学世界》
CAS
CSCD
2019年第12期857-864,共8页
Chemical World
基金
江苏省自然科学基金(No.BK20150282)
苏州市应用基础研究计划(No.SYG201440)
国家级大学生创新创业训练计划(No.201710332015Z)资助项目