Carbazole-substituted benzobisoxazoles: near-UV fluorescent emitters and ambipolar hosts for organic light-emitting diodes
Carbazole-substituted benzobisoxazoles: near-UV fluorescent emitters and ambipolar hosts for organic light-emitting diodes
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咔唑取代的苯并二恶唑：近紫外荧光发射体和有机发光二极管的双极性主体
DOI：
10.1039/d2tc03190f
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发表时间：
2022
影响因子：
6.4
通讯作者：
Jeffries-EL, Malika
中科院分区：
文献类型：
--
作者：
Wheeler, David L.;Fisher, Lloyd;Friederich, Pascal;Cunningham, Christopher;Muthike, Angelar K.;Aspuru-Guzik, Alán;Goodson, Theodore;Jeffries-EL, Malika
报道了具有热激活延迟荧光（TADF）特性的有机发光二极管（OLED）材料的设计。以计算方法（DFT/TD-DFT）为指导，通过改变咔唑取代的苯基取代基的共轭位置和BBO异构体的类型（cis-vs. trans-），设计了6种具有苯并双恶唑（BBO）核和给体-受体-给体结构的材料.实验稳态和瞬态吸收光谱技术被用来探测这些分子的TADF活性。然后将每种材料作为近UV掺杂剂或具有低单重态-三重态能量差的主体用于主-客体OLED器件中。电致发光性质显示，当用作掺杂剂时，这些材料提供近UV发射（CIEy < 0.06且CIEx = 0.16），而当用作主体时，当与商业材料相比时，这些材料显示降低的操作电压和增加的性能效率。
The design of organic light emitting diode (OLED) materials with the potential for exhibiting thermally-activated delayed fluorescence (TADF) is reported. Using computational methods (DFT/TD-DFT) as a guiding tool, six materials with a benzobisoxazole (BBO) core and donor–acceptor–donor architectures were designed by changing the conjugation position of carbazole-substituted phenyl substituents and the type of BBO isomer (cis- vs. trans-). Experimental steady-state and transient absorption spectroscopic techniques were utilized to probe the TADF activity of these molecules. Each material was then used in host–guest OLED devices as either near-UV dopants or host with low singlet-triplet energy differences. The electroluminescent properties show that when used as dopants these materials provide near-UV emission (CIEy < 0.06 and CIEx = 0.16), whereas when used as hosts, these materials show reduced operating voltages and increased performance efficiencies when compared to commercial materials.