The Photoluminescent Properties of New Cationic Iridium( III) Complexes Using Different Anions and Their Applications in White Light-Emitting Diodes

Three cationic iridium(III) complexes [Ir(PPY)(2)(Phen)][PF6] (C1), [Ir(ppY)(2)(Phen)](2)SiF6 (C2) and [Ir(PPY)(2)(Phen)](2)TiF6 (C3) (PPy: 2-phenylpyridine, phen: 1, 10-phenanthroline) using different anions were synthesized andcharacterized by H-1 Nuclear magnetic resonance ((HNMR)-H-1), mass spectra (MS), Fourier transform infrared (FTIR) spectra and element analysis (EA). After the ultraviolet visible (UV-vis) absorption spectra, photoluminescent (PL) properties and thermal properties of the complexes were investigated, complex C 1 and C3 with good optical properties and high thermal stability were used in white light-emitting diodes (WLEDs) as luminescence conversion materials by incorporation with 460 nm-emitting blue GaN chips. The integrative performances of the WLEDs fabricated with complex C1 and C3 are better than those fabricated with the widely used yellow phosphor Y3Al5O12:Ce3+ (YAG). The color rendering indexes of the WLEDs with C1 and C3 are 82.0 and 82.6, the color temperatures of them are 5912 K and 3717 K, and the maximum power efficiencies of them are 10.61 Lm. W-1 and 11.41 Lm. W-1, respectively.