A new (4-(3,5-dimethylphenyl)-2-(m-tolyl)pyridine)-based iridium complex was synthesized for highly efficient orange phosphorescent organic light-emitting diodes (PhOLEDs). The effect of introduction of a methyl substituent into the 4-position of the phenyl ring in a phenylpyridine chelating ligand was studied. The PhOLEDs based on this newly-synthesized iridium complex exhibited maximum external quantum and current efficiencies of 20.33 % and 61.16 cd/A, respectively. These respective values maintained over 15% and 48 cd/A even at a very high luminance of 15000 cd/m² with Commission Internationale de l'Eclairage coordinates of (0.49, 0.51).

合成了一种新型的（4-（3，5-二甲基苯基）-2-（间甲苯基）吡啶）铱配合物，用于高效橙色磷光有机发光二极管（PhOLED）。研究了在苯基吡啶螯合配体中将甲基取代基引入苯环的4-位的作用。基于这种新合成的铱配合物的PhOLED分别具有最大的外部量子效率和电流效率，分别为20.33％和61.16 cd / A。即使在国际亮度委员会坐标为（0.49，0.51）的15000 cd / m ^2的极高亮度下，这些各自的值仍保持超过15％和48 cd / A。