摘要
以4-氮杂芴-9-酮(IP)为电子受体,咔唑(Cz)为电子供体,通过调节Cz在IP上的取代位置合成了4例荧光染料,即IP-6-Ph Cz、IP-7-PhCz、IP-8-PhCz和IP-9-PhCz。利用紫外吸收光谱、荧光发射光谱、电化学分析等对所得4例荧光染料的光致发光、电致发光以及电化学性质进行了测试。结果表明,IP-6-Ph Cz和IP-9-PhCz分别实现了45.3°和51.8°的大扭曲角,其单重态-三重态能级差(ΔEST)分别为0.32和0.28eV,表现出热活化延迟荧光(TADF)特征,而IP-7-PhCz和IP-8-PhCz仅是普通的荧光染料。其中,IP-7-PhCz的光致发光量子产率(PLQY)为29%,电致发光的最大外量子效率为2.8%。
Four novel fluorescent dyes, IP-6-PhCz, IP-7-PhCz, IP-8-PhCz and IP-9-PhCz, were designed and synthesized from 4-azafluoren-9-one(IP) as electron acceptor and carbazole as electron donor by adjusting the substitution position of Cz on IP. The photoluminescent, electroluminescent and electrochemical properties of four fluorescent dyes were characterized by UV-vis absorption spectroscopy, fluorescence emission spectroscopy and electrochemical analysis. The results showed that the substitution position of Cz on IP led to different molecular conformation and determines the luminescent behavior of these isomers. Isomers IP-6-PhCz and IP-9-PhCz possessed larger torsion angles of 45.3° and 51.8°, and their ΔEST were 0.32 eV and 0.28 eV, indicating that they exhibited thermally activated delayed fluorescence(TADF) feature. While IP-7-PhCz and IP-8-PhCz emitted only normal fluorescence. IP-7-Ph Cz showed higher photoluminescent quantum yields of 29% and realized the best performance with a maximum external quantum efficiency of 2.8% in organic light-emitting diode.
作者
韦钦河
刘迪
李德利
董瑞志
WEI Qin-he;LIU Di;LI De-li;DONG Rui-zhi(State Key Laboratory of Fine Chemicals,Dalian University of Technology,Dalian 116024,Liaoning,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2019年第12期2371-2377,共7页
Fine Chemicals
基金
国家自然科学基金(U1801258,21421005)
中央高校基本科研业务费(DUT18ZD212,DUT19ZD217)
