2-Phenyl-1,2,3-benzotriazole Ir(III) complexes with additional donor fragment for single-layer PhOLED devices

Phosphorescent bis-cyclometallated iridium (III) complexes based on 2-phenyl-1,2,3-benzotriazole with additional donoric diphenylamine or carbazole moieties were synthesized, studied and tested as phosphorescent materials in the single-layer phosphorescent organic light emitting diodes. These single-layer devices were fabricated employing a simple technological approach, based upon the simultaneous vacuum deposition from one crucible of host material and the corresponding phosphorescent 1,2,3-triazole-based iridium complexes. Red and orange electrophosphorescent single-layer devices with current efficiencies of 5.3 cd/A and 6.8 cd/A respectively are reported. Results of the impedance spectroscopy suggest that the proposed method of formation of the working layer provides homogeneous distribution of molecular guest in the matrix of host.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► 2-Phenyl-1,2,3-benzotriazole based Iridium (III) complexes have been synthesized. ► Single-layer orange and red PhOLEDs have been constructed. ► The maximum brightness of the obtained PhOLEDs is about 6000 and 10,000 cd/m2. ► Current efficiency of the constructed PhOLEDs is 5.3 cd/A and 6.8 cd/A.