Highly efficient non-doped deep-blue organic light-emitting diodes based on anthracene derivatives
作者:Cai-Jun Zheng、Wei-Ming Zhao、Zhi-Qiang Wang、Da Huang、Jun Ye、Xue-Mei Ou、Xiao-Hong Zhang、Chun-Sing Lee、Shuit-Tong Lee
DOI:10.1039/b918739a
日期:——
Three deep-blue-emitting anthracene derivatives, 2-tert-butyl-9,10-bis(9,9-dimethylfluorenyl) anthracene (TBMFA), 2-tert-butyl-9,10-bis[4-(2-naphthyl)phenyl] anthracene (TBDNPA), and 2-tert-butyl-9,10-bis[4-(9,9-dimethylfluorenyl)phenyl] anthracene (TBMFPA), with naphthalene or 9,9-dimethylfluorene side units, have been designed, synthesized, and characterized. The anthracene derivatives show strong deep-blue emission both in solution and in thin films. The three derivatives also have high glass-transition temperatures (Tg ≥ 133 °C) due to the presence of sterically congested terminal groups. Organic light-emitting diodes (OLEDs) prepared using these anthracene derivatives as non-doped emitters exhibit bright and saturated deep-blue emissions. OLEDs based on TBDNPA give the best performance with a low turn-on voltage (3.0 V with a brightness of 1 cd m−2), and a high efficiency (5.17% external quantum efficiency at 8.4 mA cm−2). These results are among the best ever reported for saturated deep-blue OLEDs with a CIE coordinate of y < 0.10.
三种深蓝色发射蒽衍生物,2-叔丁基-9,10-双(9,9-二甲基芴基)蒽(TBMFA)、2-叔丁基-9,10-双[4-(2-萘基) )苯基]蒽(TBDNPA)和2-叔丁基-9,10-双[4-(9,9-二甲基芴基)苯基]蒽(TBMFPA),以及萘或9,9-二甲基芴侧单元,已被设计、合成和表征。蒽衍生物在溶液和薄膜中均表现出强烈的深蓝色发射。由于存在空间拥挤的端基,这三种衍生物还具有高玻璃化转变温度(Tg ≥ 133 °C)。使用这些蒽衍生物作为非掺杂发射体制备的有机发光二极管(OLED)表现出明亮且饱和的深蓝色发射。基于 TBDNPA 的 OLED 具有低开启电压(3.0 V,亮度为 1 cd m−2)和高效率(8.4 mA cm−2 时外量子效率为 5.17%)的最佳性能。这些结果属于 CIE 坐标 y < 0.10 的饱和深蓝色 OLED 有史以来最好的结果之一。