New phosphorescent iridium(III) cyclometallated complexes bearing thiazole-based ligands (IrTZ1 and IrTZ2) have been developed. The functionalized organic ligands derived by combining the thiazolyl moiety and triphenylamino group have conferred not only favorable hole-injection/hole-transporting (HI/HT) features but also more balanced charge carrier injection/transporting traits to the as-prepared iridium(III) metallophosphors. Owing to the unique electronic structures afforded by the ligand, the orange organic light-emitting devices (OLEDs) made from IrTZ1 can furnish peak external quantum efficiency (ηext) of 14.82%, luminance efficiency (ηL) of 39.97 cd A−1 and power efficiency (ηp) of 34.95 lm W−1. Inspired by its outstanding electroluminescence (EL) performance, the orange IrTZ1 phosphor complemented with a blue phosphor FIrpic was employed to fabricate highly efficient white organic light-emitting devices (WOLEDs) with a single emission layer. Despite their simple device configuration, the optimized WOLEDs can still maintain decent electroluminescence (EL) ability with ηext of 7.20%, ηL of 18.07 cd A−1 and ηp of 19.57 lm W−1. With the aim to simplify the fabrication process of multi-layered WOLEDs, two-component WOLEDs were obtained through a novel solution processing–vacuum deposition hybrid method with the doped blue fluorescent emission layer deposited by a solution process and the orange phosphorescent emission layer made by vacuum deposition. The WOLEDs prepared using such exploratory approach can show an attractive EL performance with ηext of 9.06%, ηL of 22.72 cd A−1 and ηp of 17.28 lm W−1. All these data have indicated not only the great potential of the orange phosphor in monochromatic and white OLEDs, but also the importance of the hybrid method for simplifying WOLED fabrication.
新型荧光发光的
铱(III)环
金属化络合物,基于
噻唑配体(IrTZ1 和 IrTZ2)已被研发。通过结合
噻唑基和
三苯胺基团获得的功能化有机
配体,不仅赋予了所制备的
铱(III)
金属
磷光体良好的孔注入/孔输运(HI/HT)特性,还使其在电荷载流子注入/输运方面更加平衡。由于
配体所赋予的独特电子结构,采用 IrTZ1 制成的橙色有机发光二极管(OLED)可达到14.82%的峰外量子效率(ηext),39.97 cd A−1的亮度效率(ηL)和34.95 lm W−1的功率效率(ηp)。受到其优异电致发光(EL)性能的启发,橙色 IrTZ1
磷光体与蓝色
磷光体 FIrpic 结合,被用于制造具有单发射层的高效白色有机发光二极管(WOLED)。尽管其器件结构简单,但优化后的 WOLED 仍可保持不错的电致发光(EL)能力,ηext 为7.20%,ηL 为18.07 cd A−1,ηp 为19.57 lm W−1。为了简化多层 WOLED 的制造过程,通过一种新颖的溶液处理—真空沉积混合方法获得了双组分 WOLED,其中掺杂的蓝色荧光发射层通过溶液工艺沉积,橙色
磷光发射层则采用真空沉积制作。采用这种探索性方法制备的 WOLED 显示了吸引人的 EL 性能,ηext 为9.06%,ηL 为22.72 cd A−1,ηp 为17.28 lm W−1。所有这些数据不仅表明了橙色
磷光体在单色和白色 OLED 中的巨大潜力,还强调了混合方法在简化 WOLED 制造过程中的重要性。