咔唑衍生物E型延迟荧光特性研究

E-type delayed fluorescence of carbazole derivatives

延迟荧光(DF)来源于激发三重态(T1)通过反系间窜越重新生成激发单线态(S1)的辐射跃迁,其荧光分子构效关系的研究是有机发光二极管器件(OLED)领域研究热点课题之一。实验选用了四种具有延迟荧光特性的咔唑衍生物(2CZPN、4CZPN、4CZIPN和4CZTPN)为研究对象,通过吸收光谱、稳态-瞬态荧光光谱的测定,研究了四种咔唑衍生物的溶剂效应、浓度效应、结构效应、荧光寿命和荧光量子产率。结果发现,引入更多的咔唑基团会导致物质的吸光度、荧光和荧光量子产率的增强;咔唑基邻、对位位置(4CZIPN和4CZTPN)具有较高的荧光量子产率和宽波长的延迟荧光,可作为OLED器件潜在的发光材料。

Delayed fluorescence(DF) is derived from the radiation transition of excited triplet state(T1) which regenerates excited single line state(S1) through reverse inter-system crossing. The study of the fluorescence molecular structure-activity relationship is one of the hot topics in the field of organic light-emitting diode devices(OLED). In this paper,we studied four carbazole derivatives(2 CZPN,4 CZPN,4 CZIPN and 4 CZTPN) with delayed fluorescence properties. Solvent effect,concentration effect,structure effect,fluorescence lifetime and fluorescence quantum yield of four carbazole derivatives were investigated through the absorption spectrum and the steady-state transient fluorescence spectrum. The results show that the absorbance,fluorescence and fluorescence quantum yield have been enhanced when more carbazole groups are introduced. 4 CZIPN and 4 CZTPN have high fluorescence quantum yield and wide wavelength delayed fluorescence. They can be used as a potential luminescent material for OLED devices.