Abstract
Three different cyclic amine dyes, 9-(2-chlorophenyl)-9H-carbazole (CPCz; C18H12ClN), 10-(2-chlorophenyl)-10H-phenoxazine (CPPo; C18H12ClNO), and 10-(2-chlorophenyl)-10H-phenothiazine (CPPt; C18H12ClNS), were synthesized to systematically investigate their optical properties and electronic band structures with molecular microstructure. By the insertion of oxygen or sulfur atom into carbazole moiety, the absorption and photoluminescence (PL) spectra showed bathochromic shift, and the Stoke's shift was increased. Ionization potential of CPCz was measured as 5.75eV, on the other hand, CPPo and CPPt showed their ionization potentials of 5.37 and 5.39eV, respectively. The minute difference in chemical structure such as insertion of oxygen or sulfur atom caused huge change of optical property and electronic band structure.
Original language | English |
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Pages (from-to) | 38/[360]-47/[369] |
Journal | Molecular Crystals and Liquid Crystals |
Volume | 499 |
DOIs | |
State | Published - Feb 2009 |
Bibliographical note
Funding Information:This work was supported by the DGIST Basic Research Program of the MOST. Address correspondence to Byeong-Dae Choi, Display and Nano Devices Laboratory, Daegu Gyeongbuk Institute of Science Technology, 711, Hosan-dong, Dalseo-gu, Daegu 704-230, Korea. E-mail: [email protected]
Keywords
- Carbazole
- Cyclic amine compound
- Electronic band structure
- Phenothiazine
- Phenoxazine