Optical properties of cyclic amine type dyes, and their electronic band structures with molecular microstructure

Ki Soo Kim, Yoon Soo Han, Cham Kim, Seonju Jeong, Giseop Kwak, Hyeryun Kim, Younghwan Kwon, Seong Hwan Park, Sung Ho Woo, Dae Hwan Kim, Ki Ryong Ha, Byeong Dae Choi

Research output: Contribution to journalArticlepeer-review

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 languageEnglish
Pages (from-to)38/[360]-47/[369]
JournalMolecular Crystals and Liquid Crystals
Volume499
DOIs
StatePublished - 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

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