Excited-state intramolecular proton transfer emitter for efficient violet-blue organic light-emitting diodes with hybridized local/charge transfer channel

被引:18
作者
Wu, Yibing [1 ]
Wang, Rongxin [1 ]
Lin, Rui [1 ]
Xu, Xuee [1 ]
Zhang, Xingye [2 ]
Alsalman, Osamah [3 ]
Qiu, Yu [4 ]
Uddin, Ashraf [5 ]
Ouyang, Xinhua [1 ,4 ]
机构
[1] Fujian Agr & Forestry Univ, Fuzhou 350002, Fujian, Peoples R China
[2] South China Univ Technol, Adv Inst Aggregat Induced Light Emiss, Guangzhou 510530, Peoples R China
[3] King Saud Univ, Coll Engn, Dept Elect Engn, POB 800, Riyadh 11421, Saudi Arabia
[4] Fujian Jiangxia Univ, Key Lab Green Perovskite Applicat Fujian Prov Univ, Fuzhou 350108, Fujian, Peoples R China
[5] Univ New South Wales, Sch Photovolta & Renewable Energy Engn, Sydney, NSW 2053, Australia
关键词
Excited-state intramolecular proton transfer; Hybridized local; charge transfer; Organic light-emitting diodes; ESIPT attributed HLCT materials; HIGHLY EFFICIENT; SINGLE-LAYER; EMISSION;
D O I
10.1016/j.cej.2023.142929
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Excited-state intramolecular proton transfer (ESIPT) materials have attracted much interest, attributed to their metastable excited states which provide suitable platforms for efficient intersystem crossing (ISC) and reverse intersystem crossing (rISC). However, the studies on the utilization of ESIPT to achieve effective hybridized local/charge transfer (HLCT) emitters are rarely reported, due to their ubiquitous issue of low photo-luminescence quantum yields (OPLs). In this research, a novel ESIPT molecule with HLCT characteristic, 4 '- (diphenylamino)-4-(1,4,5- triphenyl-1H-imidazol-2-yl)-[1,1 '-biphenyl]-3-ol(HIT-TPA), is designed and synthe-sized. The hydrogen atom in this molecule can transfer on the way of an intramolecular hydrogen bond from a proton-donating part (-OH/-NH-) to the accepting one (C--O/C--N-). The HLCT and /or color-tuned fluores-cence are observed by the irradiation of specific wavelength, which followed the guidance of ESIPT. It is consistent with the results of transient absorption and time-resolved photoluminescent spectroscopy. By the synergistic interaction of ESIPT and HLCT, the film based on the target molecule presents a high OPL value of-75.5%. After employing HIT-TPA as the emitter for doped/undoped organic light-emitting diodes (OLEDs), a maximum external quantum efficiency of-10.08% is achieved, which proves the efficient triplet harvesting in the ESIPT-based HLCT material. Noticeably, the device exhibits a violet-blue emission with the CIE(x,y) of (0.152, 0.051). It is among the highest reported EQE values on the ESIPT-HLCT materials for violet-blue devices. These results not only open a novel pathway to design effective ESIPT attributed HLCT materials, but also provide a strategy to efficiently utilize ESIPT emitters in achieving high-performance OLEDs.
引用
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页数:11
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