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

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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 k_RISC 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-4PyPM和DPAC-6PyPM表现出比更高的PLQY DPAC-TPPM。同时，k为DPAc-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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