Intermolecular Charge‐Transfer Transition Emitter Showing Thermally Activated Delayed Fluorescence for Efficient Non‐Doped OLEDs |
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| Authors: | Yi‐Zhong Shi Kai Wang Xing Li Gao‐Le Dai Wei Liu Ke Ke Ming Zhang Prof Si‐Lu Tao Prof Cai‐Jun Zheng Prof Xue‐Mei Ou Prof Xiao‐Hong Zhang |
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| Affiliation: | 1. Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Jiangsu, P. R. China;2. School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu, P. R. China |
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| Abstract: | A novel molecular model of connecting electron‐donating (D) and electron‐withdrawing (A) moieties via a space‐enough and conjugation‐forbidden linkage (D‐Spacer‐A) is proposed to develop efficient non‐doped thermally activated delayed fluorescence (TADF) emitters. 10‐(4‐(4‐(4,6‐diphenyl‐1,3,5‐triazin‐2‐yl) phenoxy) phenyl)‐9,9‐dimethyl‐9,10‐dihydroacridine (DMAC‐o‐TRZ) was designed and synthesized accordingly. As expected, it exhibits local excited properties in single‐molecule state as D‐Spacer‐A molecular backbone strongly suppress the intramolecular charge‐transfer (CT) transition. And intermolecular CT transition acted as the vital radiation channel for neat DMAC‐o‐TRZ film. As in return, the non‐doped device exhibits a remarkable maximum external quantum efficiency (EQE) of 14.7 %. These results prove the feasibility of D‐Spacer‐A molecules to develop intermolecular CT transition TADF emitters for efficient non‐doped OLEDs. |
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| Keywords: | donor– acceptor systems charge transfer organic electronics organic light-emitting diodes thermally activated delayed fluorescence |
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