二苯并吡啶并喹喔啉类延迟荧光材料的合成及其电致发光性质  

Synthesis and Electroluminescence Properties of Delayed Fluorescence Materials Based on Dibenzopyridoquinoxaline

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作  者:杨耀祖 黄飞翔 谢凤鸣 张强[1] 袁国 胡英元 赵鑫[1] Yang Yaozu;Huang Feixiang;Xie Fengming;Zhang Qiang;Yuan Guo;Hu Yingyuan;Zhao Xin(School of Chemistry and Life Sciences,Suzhou University of Science and Technology,Suzhou 215009,Jiangsu,China;Jiangsu Key Laboratory for Carbon-Based Functional Materials&Devices,Institute of Functional Nano&Soft Materials(FUNSOM),Soochow University,Suzhou 215123,Jiangsu,China)

机构地区:[1]苏州科技大学化学与生命科学学院,江苏苏州215009 [2]苏州大学功能纳米与软物质研究院江苏省碳基功能材料与器件重点实验室,江苏苏州215123

出  处:《光学学报》2024年第8期160-168,共9页Acta Optica Sinica

基  金:国家自然科学基金(21905048,52303244);江苏省研究生研究创新项目(KYCX23_3342)。

摘  要:为获得新颖高效的热激活延迟荧光(TADF)材料,以二苯并吡啶并喹喔啉(BPQ)为受体(A),三苯胺(TPA)、吩噁嗪(PXZ)为供体(D),合成两种TADF材料:BPQPXZ和BPQTPA。研究表明,两种材料都具有典型的延迟荧光特性、较小的单重态与三重态的能级差(ΔEST)和较大的振子强度(f)。基于强受体强供体组合的BPQPXZ的器件实现了深红光发射,发射波长达到660 nm,但受能隙的影响,外量子效率(EQE)仅有1.0%。基于强受体弱供体组合的BPQTPA,因其TPA刚性小于PXZ,BPQTPA的供受体扭曲程度小,轨道交盖程度大,f更大,故BPQTPA具有更大的荧光量子产率(82.7%)。同时因TPA的给电子能力比PXZ弱,BPQTPA内电荷转移效应减小,导致发射峰蓝移,因此基于BPQTPA的器件发射555 nm的黄光,与BPQPXZ相比,BPQTPA器件的启亮电压降低至2.8 V,电流效率、功率效率分别提高了32倍和36倍,EQE提升了6倍,达到7.0%。Objective To obtain novel and efficient thermally activated delayed fluorescence(TADF)materials,BPQPXZ and BPQTPA are synthesized using dibenzopyridoquinoxaline(BPQ)as acceptor(A)and triphenylamine(TPA)and phenoxazine(PXZ)as donors(D).The results show that the two materials have typical delayed fluorescence characteristics,a smaller energy gap(ΔEST)between singlet and triplet states,and a larger oscillator strength(f).The device based on BPQPXZ combined with a strong acceptor and a strong donor achieves deep-red emission withλEL at 660 nm.However,due to the influence of the energy-gap law,the external quantum efficiency(EQE)is only 1.0%.BPQTPA combined with a strong acceptor and a weak donor has a larger fluorescence quantum yield(82.7%)because of the weaker rigidity of TPA than that of PXZ.As a result,the donor and acceptor of BPQTPA have less distortion,more orbital overlap,and larger f.At the same time,the intramolecular charge transfer effect of BPQTPA is weakened,and the electron-donating ability of TPA is weaker than that of PXZ.BPQTPA exhibits a blue-shifted emission compared with BPQPXZ.Therefore,the device based on BPQTPA exhibits yellow emission withλEL at 555 nm.Compared with BPQPXZ,the turn-on voltage of BPQTPA is reduced to 2.8 V;the maximum current efficiency and power efficiency are increased by 32-fold and 36-fold,respectively,and the EQE is increased by 6-fold to 7.0%.Methods In this study,BPQPXZ and BPQTPA materials are synthesized using the Suzuki reaction and BuchwaldHartwig reaction.The photophysical properties,electrochemical properties,thermal properties,and device performance of the two materials are investigated.Comparative analysis is conducted on the luminescent properties of two materials.Results and Discussions The structures of two materials,BPQPXZ and BPQTPA,are verified by 1H nuclear magnetic resonance(1H NMR)spectroscopy and high-resolution mass spectrometry(HRMS).BPQPXZ exhibits deep-red emission withλPL at 655 nm,and BPQTPA exhibits yellow emission withλPL at 585 nm(Fig.3).

关 键 词:材料 延迟荧光 有机发光二极管 二苯并吡啶并喹喔啉 电致发光 

分 类 号:O469[理学—凝聚态物理]

 

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