一种星型结构芳胺类空穴传输材料的合成及性能研究
河南省科学院化学研究所有限公司 河南省科学院化学研究所 河南师范大学材料科学与工程学院
2024-12-01
有机发光二极管 空穴传输材料 芳胺 螺芴
空穴传输材料是一类重要的有机光电功能材料，广泛应用于OLED领域。该文以具有高载流子迁移率的三苯胺为核心骨架，通过偶联反应引入具有优异热稳定性的螺芴和芴基团，设计合成了目标化合物N,N-二(9,9-二甲基-9H-芴-2-基)-9,9'-螺二芴-3-胺。结果表明，目标化合物具有较高的热稳定性，热失重温度为405℃，玻璃化温度为222℃，高于常用小分子空穴传输材料NPB的玻璃化温度（98℃）。此外，通过理论计算，目标化合物的HOMO能级为4.72eV，与常用阳极材料ITO相近，具有较小的势垒值，有利于空穴的注入。目标化合物可作为性能优异的空穴传输材料应用于OLED等光电器件。%Hole transport materials are a category of crucial organic photoelectric functional materials and are extensively utilized in the field of OLED.In this article,triphenylamine with high carrier mobility was selected as the core framework,and through a coupling reaction,spirofluorene with remarkable thermal stability and the fluorene group were introduced to synthesize the target compound N,N-bis(9,9-dimethyl-9H-fluoren-2-yl)-9,9'-spirobi[fluoren]-3-amine.The results demonstrate that the target compound possesses relatively high thermal stability,with a weight loss temperature of 405 ℃ and a glass transition temperature of 222 ℃,which is higher than the glass transition temperature(98 ℃)of commonly used small molecule hole transport materials such as NPB.Through theoretical calculation,the target compound has a relatively appropriate HOMO energy level(4.72 eV)similar to that of the commonly used prototype material ITO,and has a small potential barrier value,which is conducive to the injection of holes.It can be employed as a hole transport material with outstanding performance in optoelectronic devices such as OLED.
