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Effect of the bipyridine ligand substituents on the emission properties of phosphorescent Ir(III) compounds

To investigate the effect of bipyridine ligand substituents on the emission properties of Ir(III) compounds, four homoleptic iridium(III) compounds, specifically, mer-Ir(Mepypy)3 (1), mer-Ir(Me2pypy)3 (2), fac-Ir(OMe2pypy)3 (3) and Ir(OMe2Bupypy)3 (4), where Mepypy = 2'-methyl-2,3'-bipyridine, Me2pypy = 2′,6'-dimethyl-2,3'-bipyridine, OMe2pypy = 2′,6'-dimethoxy-2,3'-bipyridine and OMe2Bupypy = 2′,6'-dimethoxy-4-tert-butyl-2,3'-bipyridine, were prepared via a one-pot reaction of the corresponding methyl- or methoxy-substituted ligand with Ir[(COD)]BF4 as the starting material. Under the same reaction conditions, the major isolated products differed depending on the substituent used. The methyl substituents resulted in Ir(III) compounds with a meridional geometry, while methoxy-substituted Ir(III) compounds with a facial geometry were isolated in high yields when the methoxy substituent was used. Compounds 1 and 2 emit a green phosphorescence (ΦPL = 0.3) with a λmax = 459–463 nm, while 3 and 4 show a bright, sky-blue emission (ΦPL = 0.5). The dimethoxy-substituted bipyridine ligand was advantageous in terms of yield, thermal stability and quantum efficiency, and its iridium compound is a good candidate for triplet emitters in phosphorescence organic light-emitting diodes (PHOLEDs).

ORGANIC ELECTROLUMINESCENT MATERIALS AND DEVICES

Disclosed are a compound including a ligand L_A of chemical formula I, and a preparation and a device containing the compound of the chemical formula I. In the compound having a ligand L_A of chemical formula I, R^1 is monosubstitution, bisubstitution, or non-substitution, R^2 is monosubstitution, bisubstitution, trisubstituion, tetrasubstitution, or non-substitution, R is selected from hydrogen, deuterium, alkyl, cycloalkyl, and combination of the same, and R^1 and R^2 are dependently selected from hydrogen, deuterium, alkyl, cycloalkyl, aryl, and combination of the same, a random adjacent substituent of R^2 is randomly connected to form a condensed ring, the ligand L_A is coordinately bonded to metal M, and the ligand L_A is randomly connected to another ligand, and includes a tridentate, tetradentate, pentadentate, and hexadentate.COPYRIGHT KIPO 2015