Efficient solution-processible yellow/orange emissive phosphors are highly required in solution-processed phosphorescent organic light-emitting diodes (s-PhOLEDs). With respect to phenyl pyridine (ppy)-type Ir(III) complexes, 2-(9,9-diethylfluoren-2-yl)pyridine (Flpy)-type Ir(III) complexes have huge potential in yellow/orange s-PhOLEDs due to their extended conjugation and excellent solubility in common organic solvents. Herein, a new series of phosphorescent Ir(III) complexes, i.e. Ir(Flpy)₂pic-NO, Ir(Flpy-CF₃)₂pic-NO, Ir(Flpy-CF₃)₂dbm and Ir(Flpy-CF₃)₂acac, based on Flpy main ligand and picolinic N-oxide (pic-NO), acetylacetone (acac), and dibenzoyl methane (dbm) ancillary ligands are synthesized. The photophysical, electrochemical, and electroluminescent (EL) properties of these phosphorescent Ir(III) complexes are investigated in details. By introducing the CF₃ group in Flpy ligand and varying the ancillary ligands, the emission spectra of these phosphorescent complexes are tuned in a large range with EL emission peaks from 544 nm to 588 nm. The s-PhOLEDs employing these phosphors show promising EL performance with maximum external quantum efficiency (EQE) from 15.4% to 23.7% and high power efficiency from 61.9 l m W⁻¹ to 80.4 l m W⁻¹. These highly efficient phosphorescent Ir(III) complexes may serve as ideal chromaticity components in solution-processed full-color displays and lighting devices.

在溶液处理的磷光有机发光二极管（s - PhOLED）中，非常需要有效的溶液可处理的黄/橙色发射磷光体。关于苯基吡啶（ppy）型Ir（III）配合物，2-（9,9-二乙基氟-2-基）吡啶（Flpy）型Ir（III）配合物在黄色/橙色s -PhOLED中具有巨大潜力由于它们的共轭作用延长，并且在普通有机溶剂中具有出色的溶解性。在这里，一系列新的磷光Ir（III）配合物，即Ir（Flpy）₂ pic-N O，Ir（Flpy-CF ₃）₂ pic-N O，Ir（Flpy-CF ₃）₂ dbm和Ir（Flpy -CF ₃）₂基于Flpy主配体和吡啶甲酸N-氧化物（pic-N O）合成acac，乙酰丙酮（acac）和二苯甲酰甲烷（dbm）辅助配体。这些磷光Ir（III）配合物的光物理，电化学和电致发光（EL）性能进行了详细的研究。通过将CF ₃基团引入Flpy配体并改变辅助配体，可以在544 nm至588 nm的EL发射峰的较大范围内调节这些磷光配合物的发射光谱。使用这些荧光粉的s -PhOLED表现出令人鼓舞的EL性能，最大外部量子效率（EQE）从15.4％至23.7％，高功率效率从61.9 l m W ^-1至80.4 l m W ^-1。这些高效磷光的Ir（III）络合物可作为溶液处理的全色显示器和照明设备中的理想色度成分。