For the application to white organic light-emitting diodes (WOLEDs), new orange phosphorescent iridium complexes were designed and prepared. We introduced 1-(8-naphthyl)-isoquinoline ligands (8-NAIQ) to the iridium center along with the ancillary ligands, 2-phenylpyridine (ppy) and 2-phenylquinoline (pq). The resulting iridium complexes synthesized herein are (8-NAIQ)Ir(ppy)(2) and (8-NAIQ)Ir(pq)(2). The photoabsorption, photoluminescence (PL), and electrochemical properties of the irdium complexes synthesized in this study were investigated. The PL spectra of (8-NAIQ)Ir(ppy)(2) and (8-NAIQ)Ir(pq)(2) exhibited the luminescence peaks at 536 and 583nm with the full-width at half-Maximum of 115 and 90nm, respectively. These complexes exhibited yellow to orange phosphorescence, covering rather wide luminescence wavelength range, which are desirable as orange emitters for two emitting component WOLEDs.