Lee Chan Hee, Choi Shin Hyung, Oh Sung Joon, Lee Jun Hyeon, Shim Jae Won, Adachi Chihaya, Lee Sae Youn
Department of Energy and Materials Engineering, Dongguk University Seoul 04620 Republic of Korea
School of Electrical Engineering, Korea University Seoul 02841 South Korea.
RSC Adv. 2020 Nov 26;10(70):42897-42902. doi: 10.1039/d0ra07865d. eCollection 2020 Nov 23.
In this study, we report new thermally activated delayed fluorescence (TADF) emitters, AcPYM (10,10'-(pyrimidine-2,5-diylbis(4,1-phenylene))bis(9,9-dimethyl-9,10-dihydroacridine)) and PxPYM (10,10'-(pyrimidine-2,5-diylbis(4,1-phenylene))bis(10-phenoxazine)), by employing donor units at the 2,5-positions of the pyrimidine acceptor unit. The donor-acceptor-donor (D-A-D) units combined in the linear molecular structure of AcPYM or PxPYM enhanced the horizontally oriented alignment, and the horizontal transition dipole moments were realized by up to 87% in the host matrix. Organic light-emitting diodes (OLEDs) containing AcPYM and PxPYM emitters realized external quantum efficiencies ( ) of 16.8% for blue and green emissions.
在本研究中，我们通过在嘧啶受体单元的2,5位引入供体单元，报道了新型热激活延迟荧光（TADF）发光体，即AcPYM（10,10'-（嘧啶-2,5-二基双（4,1-亚苯基））双（9,9-二甲基-9,10-二氢吖啶））和PxPYM（10,10'-（嘧啶-2,5-二基双（4,1-亚苯基））双（10-吩恶嗪））。结合在AcPYM或PxPYM线性分子结构中的供体-受体-供体（D-A-D）单元增强了水平取向排列，并且在主体基质中水平跃迁偶极矩实现高达87%。含有AcPYM和PxPYM发光体的有机发光二极管（OLED）实现了蓝色和绿色发射的16.8%的外量子效率（ ）。
