Phosphorescent, green-emitting Ir(III) complexes with carbazolyl-substituted 2-phenylpyridine ligands: Effect of binding mode of the carbazole group on photoluminescence and electrophosphorescence
- Authors
- Cho, Min Ju; Jin, Jung-Il; Choi, Dong Hoon; Kim, Young Min; Park, Young Wook; Ju, Byeong-Kwon
- Issue Date
- 11월-2009
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Iridium(III) complex; Carbazole; Solubility; Photoluminescence; Triplet energy transfer; Phosphorescence
- Citation
- DYES AND PIGMENTS, v.83, no.2, pp.218 - 224
- Indexed
- SCIE
SCOPUS
- Journal Title
- DYES AND PIGMENTS
- Volume
- 83
- Number
- 2
- Start Page
- 218
- End Page
- 224
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/118962
- DOI
- 10.1016/j.dyepig.2009.04.010
- ISSN
- 0143-7208
- Abstract
- The ligands, 9-((6-phenylpyridin-3-yl)methyl)-9H-carbazole and 9-(4-(pyridin-2-yl)benzyl)-9H-carbazole were synthesized by attaching a carbazolyl group to the pyridine and phenyl rings of 2-phenylpyridine, respectively. In(Ill) complexes were prepared by a simple procedure and the solubility of the novel complexes was significantly better than that of the conventional, green-emitting conventional fac-tris(2-phenylpyridinato-C-2,N)iridium(III). The Ir(III) complexes were used to prepare electrophosphorescent polymer light-emitting devices. The device comprising 10% of fac-tris(2-(4'-((9H-carbazol-9-yl)methyl)phenyl)pyridinato-C-2,N)iridium(III) exhibited an external quantum efficiency of 7.88%, luminous efficiency of 23.01 cd/A, and maximum brightness of 32,640 cd/m(2). The color of the emissions of fac-tris(2-(4'-((9H-carbazol-9-yl)methyl)phenyl)pyridinato-C-2,N)iridium(III) was similar to that of conventional fac-tris(2-phenylpyridinato-C-2,N)iridium(III). This work shows that integration of a rigid hole-transporting carbazole and phosphorescent complex in one molecule provides a new route to highly efficient, solution-processable complexes for electrophosphorescent applications. (C) 2009 Elsevier Ltd. All rights reserved.
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