期刊
DYES AND PIGMENTS
卷 128, 期 -, 页码 190-200出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2016.01.033
关键词
Optical materials; Thin film; Vacuum deposition; Luminescence; Electrochemical properties; Photophysical properties
资金
- Pusan National University, South Korea
We report the synthesis of four cationic iridium complexes, [Ir(ppy)(2)(mepzpy)]PF6 (1a), [Ir(dfppy)(2)(-mepzpy)]PF6 (1b), [Ir(ppy)(2)(dmpzpy)]PF6 (2a), and [Ir(dfppy)(2)(dmpzpy)]PF6 (2b), containing the methyl substituted pyrazole-based ancillary ligand and the phenylpyridine-based cyclometalating ligands. UV-visible, photoluminescence (PL), and voltammetric measurements were made to study the photo physical and electrochemical properties of complexes 1a-2b. Light-emitting electrochemical cells (LECs) were fabricated, which showed yellow emission for complexes la and 2a and green emission for complexes 1b and 2b. The LEC incorporating 2b exhibited a high luminance of 658 cd m(-2) and a current efficiency of 0.34 cd A(-1). The higher luminance and efficiency of the device based on 2b were due to the smooth surface morphology and the presence of sterically hindered dimethyl groups on the ancillary ligand (dmpzpy), which causes a more balanced charge carrier injection and recombination. (C) 2016 Elsevier Ltd. All rights reserved.
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