We have synthesized and characterized a novel blue-emitting material, 2-tert-butyl-9,10-bis[4′-(9-p-tolyl-fluoren-9-yl)biphenyl-4-yl]anthracene (BFAn), containing an anthracene core end-capped with 9-phenyl-9-fluorenyl groups. The presence of the sterically congested fluorene groups imparts BFAn with a high thermal decomposition temperature (Td = 510 °C) and results in its forming a stable glass (Tg = 227 °C). Atomic force microscopy measurements revealed that BFAn forms high-quality amorphous films and possesses good morphological stability after annealing. Organic light-emitting diodes (OLEDs) featuring BFAn as the emitter exhibited an excellent external quantum efficiency of 5.1% (5.6 cd A−1) with Commission Internationale de L'Eclairage coordinates of (0.15, 0.12) that are very close to the National Television Standards Committee's blue standard. The power efficiency of our BFAn-based devices reached as high as 5.7 lm W−1, making them superior to other reported non-doped deep-blue OLEDs.
我们合成了一种新型蓝色
发光材料--2-叔丁基-9,10-双[4′-(9-
对甲苯基-
芴-9-基)
联苯-4-基]
蒽(BFAn),并对其进行了表征,该材料的
蒽核末端封端有 9-苯基-9-
芴基团。立体拥塞
芴基团的存在使 BFAn 具有较高的热分解温度(Td = 510 ℃),并形成稳定的
玻璃(Tg = 227 ℃)。原子力显微镜测量显示,BFAn 在退火后能形成高质量的无定形薄膜,并具有良好的形态稳定性。以 BFAn 为发射器的有机发光二极管(OLED)显示出 5.1%(5.6 cd A-1)的优异外部量子效率,其国际照明委员会坐标为 (0.15,0.12),非常接近美国国家电视标准委员会的蓝色标准。我们基于 BFAn 的器件的功率效率高达 5.7 lm W-1,优于其他已报道的非掺杂深蓝色有机发光二极管。