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Tunable emission of polymer light emitting diodes bearing green-emitting Ir(III) complexes: The structural role of 9-((6-(4-fluorophenyl)pyridin-3-yl)methyl)-9H-carbazole ligands
- Authors
- Cho, Min Ju; Jin, Jung-Il; Choi, Dong Hoon; Yoon, Jung Hee; Hong, Chang Seop; Kim, Young Min; Park, Young Wook; Ju, Byeong-Kwon
- Issue Date
- May-2010
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Iridium(III) complex; Ligand; Solubility; Photoluminescence; Triplet energy transfer; Electrophosphorescence
- Citation
- DYES AND PIGMENTS, v.85, no.3, pp.143 - 151
- Indexed
- SCIE
SCOPUS
- Journal Title
- DYES AND PIGMENTS
- Volume
- 85
- Number
- 3
- Start Page
- 143
- End Page
- 151
- ISSN
- 0143-7208
- Abstract
- 9-((6-Phonylpyridin-3-yl)methyl)-9H-carbazole and 9-((6-(4-fluorophenyl)pyridin-3-yl)methyl)-9H-carbazole were synthesized as ligands by attaching a carbazolyl group to the pyridine in 2-phenylpyridine and 2-(4-fluorophenyl)pyridine, respectively. Four different Ir(III) complexes were prepared using a simple procedure, the solubility of which was significantly greater than that of conventional green-emitting Ir(ppy)(3). Among the many devices fabricated, that which contained 10% of Ir(Cz-ppy)(1)(Cz-Fppy)(2) in PVK/PBD (70:30 wt%), exhibited an external quantum efficiency of 6.80%, luminous efficiency of 20.23 cd/A, and maximum brightness of 17520 cd/m(2). In particular, the electronic property of the new 9-((6-(4-fluorophenyl)pyridin-3-yl)methyl)-9H-carbazole ligand can manipulate the triplet energy level of the Ir(Ill) complex to finely tune the emission spectra. (C) 2009 Elsevier Ltd. All rights reserved.
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Related Researcher
- CHOI, DONG HOON
- College of Science (Department of Chemistry)