Journal
JOURNAL OF SOLUTION CHEMISTRY
Volume 43, Issue 9-10, Pages 1710-1721Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10953-014-0225-9
Keywords
Light-emitting electrochemical cells; Iridium complexes; Tetrazole; Photophysical properties; Electrochemical properties; Electrical properties
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Funding
- National Research Foundation (NRF) of Korea - Ministry of Education, Science and Technology [NRF-2013R1A1A4A03009795]
- BK 21 PLUS Center for Advanced Chemical Technology, Republic of Korea [21A20131800002]
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Light-emitting electrochemical cells (LECs) are a promising type of electroluminescent device for display and lighting applications. In this study, LECs based on ionic iridium complexes utilizing a tetrazole based ancillary ligand were fabricated and their electrical properties were investigated. Two new iridium(III) complexes with tetrazole based ancillary ligands, namely, [Ir(ppy)(2)(tetrazole)]PF6 (complex 1) and [Ir(dfppy)(2)(tetrazole)]PF6 (complex 2) (where ppy is 2-phenylpyridine, dfppy is 2-(2,4-difluorophenyl)pyridine, tetrazole is 5-bromo-2-(2-methyl-2H-tetrazol-5-yl)-pyridine and PF6 is hexafluorophosphate), have been synthesized and characterized. These synthesized complexes were used for the fabrication of LEC devices. LECs based on complex 1 result in orange light emission (576 nm) with the Commission Internationale de l'Eclairage (CIE) coordinates of (0.45, 0.49), while complex 2 emits green (518 nm) electroluminescence with the CIE coordinates of (0.33, 0.49). Our work suggests that the light emission of cationic iridium complexes can easily be tuned by the substituents on the cyclometalated ligands.
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