New dibenzofuran/spirobifluorene hybrids as thermally stable host materials for efficient phosphorescent organic light-emitting diodes with low efficiency roll-off
作者:Shou-Cheng Dong、Chun-Hong Gao、Zhao-Hu Zhang、Zuo-Quan Jiang、Shuit-Tong Lee、Liang-Sheng Liao
DOI:10.1039/c2cp41535f
日期:——
A new class of host materials DBFSF (DBFSF2 and DBFSF4) is facilely synthesized through a Suzuki coupling reaction between dibenzofuran and spirobifluorene. Their thermal, electrochemical, electronic absorption and photoluminescent properties are fully investigated. High glass transition temperatures (Tg) of 115 °C and 124 °C are observed for DBFSF2 and DBFSF4, respectively, due to the introduction
通过主体之间的Suzuki偶联反应轻松合成了新型的主体材料DBFSF(DBFSF2和DBFSF4)。 二苯并呋喃 和 螺二芴。对它们的热,电化学,电子吸收和光致发光特性进行了充分研究。由于引入了庞大的螺二芴基,DBFSF2和DBFSF4的高玻璃化转变温度(T g)分别为115°C和124°C。不出所料,具有扭曲键的DBFSF4的三重态能量比DBFSF2高,可用于蓝色和绿色磷光OLED。制作了以DBFSF2和DBFSF4为主体的电致磷光器件。除了蓝色的22.2 cd A -1的良好电流效率和绿色的64.4 cd A -1的良好电流效率外,这两种器件均实现了低效率滚降。