Trifunctional IrIII ppy-type asymmetric phosphorescent emitters with ambipolar features for highly efficient electroluminescent devices

Abstract

Simple trifunctional Ir(III) ppy-type asymmetric phosphorescent emitters with ambipolar character are reported, which afford highly efficient OLEDs.

Theoretical study on the electronic structures and phosphorescent properties of a series of iridium(III) complexes with the different positional N-substitution in the pyridyl moiety

“…complexes have attracted considerable attention as the emitting layers in organic light-emitting diodes (OLEDs) because of their good color purity, high phosphorescence emission quantum yields, short excited triplet state lifetime, and high photochemical stability [1][2][3][4][5][6][7][8]. Especially, phosphorescent Ir(III) complexes have been extensively investigated due to their good phosphorescent emission properties since the pioneering works were performed by Thompson and coworkers [9][10][11].…”

Regioisomerism in cationic sulfonyl-substituted [Ir(C^N)2(N^N)]+ complexes: its influence on photophysical properties and LEC performance

“…Most examples of sulfone-substituted cyclometallating ligands in iridium complexes are those of neutral emitters used in organic light-emitting diodes (OLEDs). [13][14][15][16][17][18][19] Recently, we have reported the synthesis and characterization of cationic [Ir(C^N) 2 (N^N)] + complexes containing sulfone-substituted phenylpyrazole 20 or phenylpyridine ligands, [21][22][23] 6 ] in Scheme 1). 22 With the aim of achieving blue emission, we recently reported the synthesis of a series of iridium complexes with 2-(4-methylsulfonylphenyl)pyridine (H1) and 2-(3-methylsulfonylphenyl) pyridine (H2) as cyclometallating ligands and electron-rich pyrazolylpyridine as the diimine N^N ligand.…”

Vom Laborkuriosum zum kontinuierlichen Prozess: Die Entwicklung thermomorpher Lösungsmittelsysteme

“…The hole injection layer and electron injection layer were made from MoO 3 and (8‐hydroxyquinolinato)lithium (LiQ), respectively. The hole‐transporting layer was constructed by using carbazole‐based HT‐1 developed in our laboratory 7j. In order to optimize the EL performance, devices with different doping levels were fabricated (Figure 4).…”