Journal
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
Volume 618, Issue 1, Pages 55-65Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/15421406.2015.1075849
Keywords
Iridium complexes; Photophysical properties; Electrochemical properties; Electroluminescence
Funding
- Basic Science Research Program through the National Research Foundation (NRF) of Korea - Ministry of Education, Science and Technology [NRF-2013R1A1A4A03009795]
- Brain Korea (BK) 21 Plus project
- National Research Foundation of Korea [2013R1A1A4A03009795] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this study, we report the design, synthesis and characterization of two new cationic iridium(III) complexes employing oxazole based ancillary ligand, namely, and [Ir(ppz)(2)(mbdiho)]PF6 (Complex 1) and [Ir(dfppy)(2)(mbdiho)]PF6 (Complex 2) and its use in light-emitting electrochemical cells (LECs). The design is based on 2-phenylpyrazole (ppz) and 2-(2,4-difluorophenyl)pyridine (dfppy) as cyclometalating ligands and 2,2-Methylenebis[3a,8a-dihydro-8H-indeno[1,2]oxazole] (mbdiho) as ancillary ligand. The effect of substituents in the cyclometalating ligands on the photophysical and electrochemical properties of the complexes has been investigated. The synthesized complexes were used for the fabrication of LEC devices and studied their electroluminescent properties. The complexes incorporated LECs resulted in a higher luminance of 2820 cd m(-2) and current efficiency of 1.04 cd A(-1) for Complex 2 than Complex 1. Our work suggests that the light emission of cationic iridium complexes can easily tuned by the substituents present on the cyclometalating ligands which resulted in yellow and green emission for LECs based on Complexes 1 and 2, respectively.
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