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An Ultraviolet Thermally Activated Delayed Fluorescence OLED with Total External Quantum Efficiency over 9.
Advanced Materials ( IF 29.4 ) Pub Date : 2020-07-02 , DOI: 10.1002/adma.202001248 Yanju Luo 1 , Shuaibing Li 2 , Yihuan Zhao 1 , Chuan Li 1 , Zhenguo Pang 1 , Yan Huang 1 , Minghui Yang 3 , Liang Zhou 2 , Xujun Zheng 1 , Xuemei Pu 1 , Zhiyun Lu 1
Advanced Materials ( IF 29.4 ) Pub Date : 2020-07-02 , DOI: 10.1002/adma.202001248 Yanju Luo 1 , Shuaibing Li 2 , Yihuan Zhao 1 , Chuan Li 1 , Zhenguo Pang 1 , Yan Huang 1 , Minghui Yang 3 , Liang Zhou 2 , Xujun Zheng 1 , Xuemei Pu 1 , Zhiyun Lu 1
Affiliation
Owing to the difficulty in acquiring compounds with combined high energy bandgaps and lower‐lying intramolecular charge‐transfer excited states, the development of ultraviolet (UV) thermally activated delayed fluorescence (TADF) materials is quite challenging. Herein, through interlocking of the diphenylsulfone (PS) acceptor unit of a reported deep‐blue TADF emitter (CZ‐PS) by a dimethylmethylene bridge, CZ‐MPS, a UV‐emissive TADF compound bearing a shallower LUMO energy level and a more rigid structure than those of CZ‐PS is achieved. This represents the first example of a UV‐emissive TADF compound. Organic light‐emitting diode (OLED) using CZ‐MPS as the guest material can emit efficient UV light with emission maximum of 389 nm and maximum total external quantum efficiency (EQEmax) of 9.3%. Note that this EQEmax value is twice as high as the current record EQEmax (4.6%) for UV‐OLEDs. This finding may shed light on the molecular design strategy for high‐performance UV‐OLED materials.
中文翻译:
紫外热活化延迟荧光OLED,其总外部量子效率超过9。
由于难以获得具有高能带隙和较低分子内电荷转移激发态的化合物,因此开发紫外(UV)热活化延迟荧光(TADF)材料非常具有挑战性。在此,通过二甲基亚甲基桥联锁已报告的深蓝色TADF发射体(CZ-PS)的二苯砜(PS)受体单元CZ-MPS,这是一种UV-发射TADF化合物,其LUMO能级更浅,刚性更高结构比CZ‐PS的要好。这是紫外线发射TADF化合物的第一个例子。使用CZ‐MPS作为客体材料的有机发光二极管(OLED)可以发出有效的紫外线,最大发射波长为389 nm,最大总外部量子效率(EQE max)为9.3%。请注意,此EQE最大值是当前UV-OLED记录EQE最大值(4.6%)的两倍。这一发现可能为高性能UV-OLED材料的分子设计策略提供了启示。
更新日期:2020-08-11
中文翻译:
紫外热活化延迟荧光OLED,其总外部量子效率超过9。
由于难以获得具有高能带隙和较低分子内电荷转移激发态的化合物,因此开发紫外(UV)热活化延迟荧光(TADF)材料非常具有挑战性。在此,通过二甲基亚甲基桥联锁已报告的深蓝色TADF发射体(CZ-PS)的二苯砜(PS)受体单元CZ-MPS,这是一种UV-发射TADF化合物,其LUMO能级更浅,刚性更高结构比CZ‐PS的要好。这是紫外线发射TADF化合物的第一个例子。使用CZ‐MPS作为客体材料的有机发光二极管(OLED)可以发出有效的紫外线,最大发射波长为389 nm,最大总外部量子效率(EQE max)为9.3%。请注意,此EQE最大值是当前UV-OLED记录EQE最大值(4.6%)的两倍。这一发现可能为高性能UV-OLED材料的分子设计策略提供了启示。