A green emitting iridium(III) complex with narrow emission band and its application to phosphorescence organic light-emitting diodes (OLEDs)

Organic Optoelectronic Materials

“…5,11-Bis(4-octylphenyl)indolo[3,2-b]carbazole, 170 readily self-organized into highly crystalline layered structures during vacuum deposition. FET devices based on the thin film of 170 exhibited mobility of 0.12 cm 2 V −1 s −1 [201]. The chlorinated derivative 171 also easily formed highly crystalline films with large interconnecting terrace-like layered domain structures, and showed a mobility of 0.14 cm 2 V −1 s −1 and an on/off current ratio of 10 7 under ambient conditions [202].…”

“…The experimental results on OLEDs also show that most Ir(X-ppy) 3 are better than Ir(ppy) 3 because of the presence of electron transporting X-substituent. Jung et al [201] reported a homoleptic Ir(III) complex of fac-tris[2-(3′-trimethylsilylphenyl)-5-trimethylsilylpyridinato]iridium [Ir(dsippy) 3 ] with narrow green emission (full-width at half-maximum: 50 nm) and higher efficiency than Ir(ppy) 3 . The bulky silyl group on the ppy ring seems to play a key role in suppressing various intermolecular excited-state interactions, which illustrates a way to solve the problem of color purity for green phosphorescence.…”

Organic Semiconductor Electroluminescent Materials

“…The experimental results on OLEDs also show that most Ir(X-ppy) 3 are better than Ir(ppy) 3 because of the presence of electron transporting X-substituent. Jung et al [201] reported a homoleptic Ir(III) complex of fac-tris[2-(3′-trimethylsilylphenyl)-5-trimethylsilylpyridinato]iridium [Ir(dsippy) 3 ] with narrow green emission (full-width at half-maximum: 50 nm) and higher efficiency than Ir(ppy) 3 . The bulky silyl group on the ppy ring seems to play a key role in suppressing various intermolecular excited-state interactions, which illustrates a way to solve the problem of color purity for green phosphorescence.…”

Solution-processed red iridium complexes based on carbazole-phenylquinoline main ligand: Synthesis, properties and their applications in phosphorescent organic light-emitting diodes

“…However, the performance of polymer-and dendrimer-based phosphorescent materials is significantly lower than that of their solution processable small molecule counterparts. Many attempts have been made to tailor the ligand structure in order to establish the relationship between the structures of the ligands and properties of the iridium complexes, and then develop good materials for red [25], green [26] and blue [27] OLEDs. It has been found that the emission wavelength of iridium complexes can usually be tuned by choosing appropriate substituents and changing their positions.…”