Pyrazine-fused polycyclic aromatic hydrocarbons towards efficient multiple-resonance narrowband deep-blue emission  

作　　者：Yajie Wang Wei Yang He Zhang Nengquan Li Shaolong Gong Xiang Gao Chuluo Yang 

机构地区：[1]Department of Chemistry,Renmin Hospital of Wuhan University,Wuhan University,Wuhan 430072,China [2]Department of Pharmacy,Renmin Hospital of Wuhan University,Wuhan 430060,China [3]Shenzhen Key Laboratory of New Information Display and Storage Materials,College of Materials Science and Engineering,Shenzhen University,Shenzhen 518060,China [4]College of Biological and Pharmaceutical Science,Hubei Key Laboratory of Natural Products Research and Development,China Three Gorges University,Yichang 443002,China

出　　处：《Science China Chemistry》2025年第3期1018-1025,共8页中国科学(化学英文版)

基　　金：financial support from the National Natural Science Foundation of China (52130308);Shenzhen Science and Technology Program (JCYJ20220818095816036,ZDSYS20210623091813040)。

摘　　要：Developing organic multiple-resonance(MR)deep-blue emitters with narrow full widths at half maximum(FWHMs)is crucial for enhancing the color purity of organic light-emitting diodes(OLEDs).However,the exploration of new MR cores remains very limited to date.Furthermore,redshifting the emission color of MR emitters is also a formidable challenge.Pyrazine,characterized by its planar and rigid structure,exhibits a strong electronegativity,which may make it a promising candidate for constructing MR emitters with a red shifted emission compared to indolo[3,2,1-jk]carbazole(ICz)-based MR molecules.Herein,a series of polycyclic aromatic hydrocarbons(PAHs)with MR characteristics are designed and synthesized by integrating a pyrazine core with various electron-donating segments,which exhibit the narrowband deep-blue emission peaks ranging from 423 to 459 nm with FWHMs<50 nm in toluene.It is demonstrated that increasing donor strength and changing meta-to paraoriented nitrogen atom can induce the bathochromic emission.Theoretical investigations reveal that the non-bonding orbital characteristic of pyrazine suppress the undesired stretching vibration and promote resonance effect.The optimized deep-blue OLEDs fabricated with the pyrazine-embedded MR emitters demonstrate a high external quantum efficiency(EQE)of 23.5%,and narrowband emission with an electroluminescence peak at 454 nm.

关 键 词：multiple-resonance PYRAZINE polycyclic aromatic hydrocarbon organic light-emitting diode 

分 类 号：TN383.1[电子电信—物理电子学] O626[理学—有机化学]