Carbazole derivatives containing one or two tetra-/triphenylethenyl units as efficient hole-transporting OLED emitters
作者:Sohrab Nasiri、Monika Cekaviciute、Jurate Simokaitiene、Aina Petrauskaite、Dmytro Volyniuk、Viktorija Andruleviciene、Oleksandr Bezvikonnyi、Juozas Vidas Grazulevicius
DOI:10.1016/j.dyepig.2019.04.045
日期:2019.9
(up to 120 °C) and lower ionization potentials (of ca. 5.15 eV) comparing to mono substituted derivatives. Time-of-flight hole drift mobility values of the studied compounds with two substituents reached 10−3 cm2/V at high electric fields. Non-doped fluorescent OLEDs based on carbazole derivative containing two tetraphenylethenyl units demonstrated extremely high external quantum efficiency as for simple
为了提高非掺杂的荧光有机发光二极管的效率,开发了含有四-/三苯乙烯单元的新型高效咔唑基发光体。使用各种实验和理论技术,对含有一个或两个四-/三苯基乙烯基单元的衍生物的性能进行了比较研究。取决于替换模式,发射器显示出强烈的蓝色或绿色发射,这会因聚集而增强。与单取代的衍生物相比,具有两个取代基的化合物显示出更高的玻璃化转变温度(最高120°C)和更低的电离电势(约5.15 eV)。具有两个取代基的被研究化合物的飞行时间空穴漂移迁移率值达到10 -3 cm 2/ V在高电场下。与简单的荧光有机发光器件相比,基于含有两个四苯基乙烯基单元的咔唑衍生物的非掺杂荧光OLED表现出极高的外部量子效率,达到了5.32%。