Functional Ir^III Complexes and Their Applications

Abstract

Iridium complexes are drawing great interest because they exhibit high phosphorescence quantum efficiency. Extensive efforts have been devoted to the molecular design of ligands to achieve phosphorescent emission over a wide range of wavelengths that is compatible with many applications. In this research news article, we focus on materials design to improve the performance of phosphorescent Ir(III) complexes for organic light-emitting diodes (OLEDs), luminescence sensitizers, and biological imaging.

Synthesis, Diastereomer Separation, and Optoelectronic and Structural Properties of Dinuclear Cyclometalated Iridium(III) Complexes with Bridging Diarylhydrazide Ligands

“…3.0 and 3.3 eV for 13 and 14, respectively. For the phenylpyridine complexes 15 and 16 similar assignments apply to the absorption spectra ( Figure 7, Table 3): 1 π-π* 250-350 nm, 1 MLCT and 3 MLCT 350-500 nm. 13,63 Figure 7.…”

“…This yielded the meso isomer (13a) as pale green crystals (172 mg, 0.12 mmol, 21%). 1 3.20; N, 9.62. The filtrate from the trituration was mixed with celite (ca.…”

“…This upfield shift is consistent with intramolecular  stacking in the complexes, as observed in the X-ray crystal structures (see below). Additional NMR spectra (where solubility allowed) including 1 The optimized ground state S 0 geometries were calculated at the B3LYP/LANL2DZ:3-21G* level with the LANL2DZ pseudopotential for the iridium atoms and the 3-21G* basis set for other atoms. These data are, therefore, directly comparable to previous computational studies on Ir(ppy) 3 and other diiridium complexes.…”

Crystal structure of 2-(2-naphthyl)-4,6-dimethylpyrimidine, C16H14N2

“…Cyclometalated iridium complexes have attracted considerable attentioninmaterial research because of their outstanding performance in organic light-emitting diodes (OLED) [2,3]. In recent years, varioust ypes of cyclometalated Ir(III) complexes have been developed, such as homoleptic complexes, heteroleptic neutral complexes and cationic complexes [4][5][6].…”

Crystal structure of dibenzoylmethane-k2O,O'-bis[2-(2- naphthyl)-3-methoxy-6-methylpyridine-k2C2,N]iridium(III), Ir(C34H28N2O2)2(C15H11O2)

“…Cyclometalated Ir(III) complexes have emerged as av ery interesting class of compounds for various applications [2][3]. They represent the most promising phosphorescent dopants for organic light-emitting diodes (OLED) because of their relatively shorte xcited-state lifetime,h ighp hotoluminescence efficiency and excellent color tunability [4][5][6].…”