Syntheses and characterizations of 5-nitro-2-(3',5'-di(trifluoromethyl)phenyl)pyridyl-co ntaining iridium(III) complexes and the two-band white photoluminescence properties in solution

• Published in: Journal of coordination chemistry Vol. 69; no. 21; pp. 3172 - 3181
• Main Authors: Xu, Jia-Xin, Xue, Hao, Zou, Hao, Ke, Si-Wen, Qin, Tao, Wang, Xin, Shen, Xuan, Zhu, Dun-Ru
• Format: Journal Article
• Language: English
• Published: 01.11.2016
• Subjects: Derivatives; Emission; Ligands; Light emission; Luminescence; Photoluminescence; Spectral emissivity; White light
• ISSN: 0095-8972; 1029-0389
• DOI: 10.1080/00958972.2016.1230671

A derivative of 2-phenylpyridine (Hppy), 5-nitro-2-(3',5'-di(trifluoromethyl)phenyl)pyridine (HL), is prepared. The L-containing cyclometalated iridium(III) complexes with mono- and bidentate ancillary ligands, [Ir(L) sub(2)(PPh sub(3))Cl] (1) and [Ir(L) sub(2)(pic)] (2, pic = picolinic acid), are synthesized and characterized. The photoluminescence (PL) spectra of 1 and 2 in CH sub(2)Cl sub(2) solutions show emission maxima at 558 and 560 nm, corresponding to yellow light emission with the Commission Internationale de L'eclairage (CIE) coordinates of (0.45, 0.54) and (0.46, 0.52), respectively. However, the luminescence intensity of 2 with PL quantum yield of 0.71 is obviously stronger that of 1 with PLQY of 0.19. The two-band white PL properties of 2 and [Ir(dfppy) sub(2)(PPh sub(3))(NCS )] (3, dfppy = 2-(4,6-difluorophenyl)pyridine) with efficient blue light emission are investigated. The CH sub(2)Cl sub(2) solutions of 2 and 3 in the molar ratio of 1 : 5 show white light emission with the CIE coordinates of (0.33, 0.41).