通过扩展LUMO分布提高热激活延迟荧光材料的性能

作者:柯珂;陈嘉雄;张明;王凯;史益忠;林慧;郑才俊;陶斯禄;张晓宏 刊名:中国科学:材料科学(英文版) 上传者:陈燕梅

【摘要】为了进一步提高热激活延迟荧光(TADF)发射体的性能;我们基于之前报道的TADF材料MAC;设计并合成了优化的化合物MAB.通过在香豆素平面中加入苯基;扩展了MAB的最低未占据分子轨道(LUMO)的分布.与MAC相比;MAB减少了前沿分子轨道的电子交换并且延展了分子偶极矩;从而提升了材料性能.基于MAB的有机发光二极管(OLED)的最大外量子效率(EQE)为21.7%;远远高于采用MAC作为发光材料的OLED器件12.8%的最大EQE.我们的工作证明;扩展LUMO的分布是提高TADF材料性能的一种简单而有效的方法.

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SCIENCE CHINA Materials ARTICLES mater.scichina.com link.springer.com Published online 2 November 2018 | https://doi.org/10.100刀S40843-018-9358-9 Sci China Mater 2019, 62(5): 719-728 CrossMark Improving performance of thermally activated delayed fluorescence emitter by extending its LUMO distributio n Ke Ke1,2, Jia-Xiong Chen2, Ming Zhang1'2, Kai Wang2*, Yi-Zhong Shi2, Hui Lin1, Cai-Jun Zheng1*, Si-Lu Tao1 and Xiao-Hong Zhang2* ABSTRACT An optimized compound 9-(9,9-dimethylacri- din-10(9H)-yl)-6H-benzo[c]ch-romen-6-one (MAB) was de­ signed and synthesized based on our previously reported TADF emitter 6-(9,9-dimethylacridin-10(9H)-yl)-3-methyl- 1 H-isochromen-1 -one (MAC) to further improve the perfor­ mance of thermally activated delayed fluorescence (TADF) emitters. With the additional phenyl in coumarin-contained plane, MAB possesses an extended distribution of the lowest unoccupied molecular orbitals (LUMO), and thus realizes reduced electron exchange between the frontier molecular orbitals and a stretched molecular dipole moment compared with MAC. MAB based organic light-emitting diode (OLED) exhibits a remarkable maximum external quantum efficiency (EQE) of 21.7%, which is much better than the maximum EQE of MAC-based OLED with a value of 12.8%. Our work proves that extending the distribution of LUMO is a simple but effective method to improve the efficiency of TADF emitter. Keywords: organic light-emitting diode, thermally activated delayed fluorescenc

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