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Manipulating the positions of CH⋯N in acceptors of pyrimidine–pyridine hybrids for highly efficient sky-blue thermally activated delayed fluorescent OLEDs†
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2018-09-12 00:00:00 , DOI: 10.1039/c8qm00382c
Qing Zhang 1, 2, 3, 4 , Shuaiqiang Sun 1, 2, 3, 4 , Xialei Lv 1, 2, 3, 4 , Wei Liu 1, 2, 3, 4 , Hongxia Zeng 1, 2, 3, 4 , Runda Guo 1, 2, 3, 4 , Shaofeng Ye 1, 2, 3, 4 , Panpan Leng 1, 2, 3, 4 , Songpo Xiang 1, 2, 3, 4 , Lei Wang 1, 2, 3, 4
Affiliation  

Three novel TADF materials, 10-(6-(2,6-diphenylpyrimidin-4-yl)pyridin-3-yl)-9,9-diphenyl-9,10-dihydroacridine (DPAc-4PyPM), 9,9-diphenyl-10-(4-(2-phenyl-6-(pyridin-2-yl)pyrimidin-4-yl)phenyl)-9,10-dihydroacridine (DPAc-6PyPM) and 10-(4-(2,6-diphenylpyrimidin-4-yl)phenyl)-9,9-diphenyl-9,10-dihydroacridine (DPAc-TPPM) have been designed and synthesized. CH⋯N intramolecular hydrogen-bonding interactions were introduced into pyrimidine–pyridine hybrid acceptors, then the TADF properties can be tuned by skillful manipulation of the positions of CH⋯N in the acceptor moiety. Both DPAc-4PyPM and DPAc-6PyPM exhibit a higher PLQY than DPAc-TPPM. Simultaneously, the kRISC realized for DPAc-4PyPM is nearly 5 or 10 fold higher than that of its analogues. The optimized sky-blue device using DPAc-4PyPM as a dopant demonstrated the maximum external quantum efficiency, current efficiency and power efficiency of 24.34%, 53.89 cd A−1 and 36.79 lm W−1, respectively, which is comparable to most of the previously reported pyrimidine-based TADF OLEDs.

中文翻译:

操纵嘧啶-吡啶杂化物受体中CH⋯N的位置,获得高效的天蓝色热活化延迟荧光OLED

三种新型TADF材料:10-(6-(2,6-二苯基嘧啶-4-基)吡啶-3-基)-9,9-二苯基-9,10-二氢ac啶DPAc-4PyPM),9,9-二苯基-10-(4-(2-苯基-6-(吡啶-2-基)嘧啶-4-基)苯基)-9,10-二氢ac啶DPAc-6PyPM)和10-(4-(2,6-设计并合成了二苯基嘧啶-4-基)苯基)-9,9-二苯基-9,10-二氢ac啶DPAc-TPPM)。将CH⋯N分子内氢键相互作用引入嘧啶-吡啶杂合受体中,然后可以通过熟练操纵受体中CH⋯N的位置来调节TADF的性质。既DPAC-4PyPMDPAC-6PyPM表现出比更高的PLQY DPAC-TPPM。同时,kDPAc-4PyPM实现的RISC比其类似物高近5或10倍。使用DPAc-4PyPM作为掺杂剂的优化的天蓝色器件显示出最大的外部量子效率,电流效率和功率效率分别为24.34%,53.89 cd A -1和36.79 lm W -1,与大多数先前报道的基于嘧啶的TADF OLED。
更新日期:2018-09-12
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