Synthesis and Luminescence Property of a New Yellow Phosphorescent Iridium(Ⅲ) Pyrazine Complex

Abstract

Abstract: A new iridium pyrazine complex, [Ir(dphp)₂(acac)] (dphp=2, 3 diphenylpyrazine, acac=acetylacetone), was synthesized by reaction of diphenylpyrazine with iridium trichloride hydrate. The complex was characterized by elemental analysis, ¹H NMR, and mass spectroscopy. The UV Vis absorption and photoluminescence of the complex were investigated. The complex shows strong ¹MLCT(singlet metal to ligand charge transfer) and ³MLCT(triplet metal to ligand charge transfer) absorption at 393 and 528 nm, respectively. Organic light emitting diodes(OLEDs) with a configuration of ITO/NPB(30 nm)/NPB∶8% [Ir(dphp)₂(acac)] (25 nm)/PBD(10 nm)/Alq₃(30 nm)/Mg∶Ag(mass ratio 9∶1)(130 nm) were fabricated by using this complex as the triplet emissive dopant in NPB. The diodes showed an external quantum efficiency of 13.85% at 6.5 V and brightness of 11 478 cd/m² at 10 V. The power efficiency of the device was 15.54 lm/W at 6.5 V, indicating that this complex is a promising electrophosphorescent materials.

Key words: Phosphorescent material, Heavy metal complex, Triplet, OLED

CLC Number:

O621

TrendMD:

ZHANG Guo-Lin, LIU Ze-Hua, GUO Hai-Qing, CHUAI Yu-Tao, ZHEN Chang-Gua, ZOU De-Chun . Synthesis and Luminescence Property of a New Yellow Phosphorescent Iridium(Ⅲ) Pyrazine Complex[J]. Chem. J. Chinese Universities, 2004, 25(3): 397.

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Synthesis and Luminescence Property of a New Yellow Phosphorescent Iridium(Ⅲ) Pyrazine Complex

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