The new phosphorescent Iridium complexes containing naphthylisoquinoline ligands for WOLEDs

ABSTRACT

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 583 nm with the full-width at half-Maximum of 115 and 90 nm, 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.

KEYWORDS:

• Iridium complexes
• OLED
• orange phosphorescence
• naphthylisoquinoline

Funding

This research work was supported by 2015 Hongik University Research Fund.