A novel orange cationic organic iridium(Ⅲ) complex, [(ppy)2Ir(btz)]PF6, was synthesized using IrCl3·3H2O as iridium(Ⅲ) source, 2-phenylpyridine(ppy) as main ligand and 2,2'-bithiazole(btz) as auxiliary ligand. After the mixture of aforementioned three compounds was refluxed in glycol for 24 h, an ion exchange reaction was made with an aqueous solution of NH4PF6 for providing target complex. The correlated color temperature(CCT) of white light-emitting diodes(WLEDs) fabricated by 455 nm-emitting blue GaN chip and Y3Al5O12∶Ce3+(YAG∶Ce, 6.0% mass ratio to silicone) obviously declined when the complex was blended in silicone and also used in these WLEDs. Before the complex was used, CCT of the YAG∶Ce-based WLED was 7133 K, the luminous efficiency(ηL) was 137.1 lm/W, the color rendering index(CRI) was 79.9, and the CIE(Commission International de I'Eclairage) value was (0.31, 0.31). When [(ppy)2Ir(btz)]PF6 was used in aforementioned WLEDs at 1.0%, 1.5% and 2.0% blending concentrations, CCT successively decreased to 5645 K(cold white light), 4072 K(neutral white light) and 3161 K(warm white light), the corresponding ηL values were 102.1, 79.1 and 66.6 lm/W, CRI were 81.9, 77.3 and 70.0, CIE values were (0.33, 0.31), (0.36, 0.33) and(0.42, 0.38), respectively. The results show that [(ppy)2Ir(btz)]PF6 is a promising orange phosphor candidate for fabricating efficient neutral/warm WLEDs.