Synthesis and photophysical properties of multi-branched ethynyl fluorene-labeled molecules

Hu Xiaodan, Hong Suk Kim, Min Ju Cho, Jung Il Jin, Young Min Kim, Young Wook Park, Byeong Kwon Ju, Dong Hoon Choi

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Two kinds of emissive multi-branched molecule based on an ethynyl fluorene were synthesized by cyclotrimerization method. An ethynyl fluorene-labeled three-armed molecule, DBFP was prepared and the other one, CzDBFP has carbazole terminal groups tethered to DBFP. Their absorption and photoluminescent properties were investigated. The spectral analyses indicate that the molecules bearing ethynyl fluorene moieties as a peripheral group can exhibit highly isolated photophysical properties. The multi-branched molecule, CzDBFP was mixed with 2-{2-[2-(4-diethylamino-phenyl)-vinyl]-6-methyl-pyran-4-ylidene}-malononitrile (DCM1) with an optimum concentration. At the low concentration (0.3 wt%) of DCM1, white emission was observed by incomplete energy transfer process from an excited CzDBFP. At the high concentration (3.0 wt%), red emission was predominantly observed, which was attributed to an efficient Förster energy transfer process.

Original languageEnglish
Pages (from-to)1034-1039
Number of pages6
JournalSynthetic Metals
Issue number24
Publication statusPublished - 2007 Dec

Bibliographical note

Funding Information:
This research work was supported by 21st Century Frontier Research Program (F0004091-0000-00) and LG-Philips-LCD CO. Ltd (2007–2008). Particularly, D.H. Choi acknowledges the financial support by the Seoul R&BD Program (2007–2008).


  • Absorption
  • Förster energy transfer
  • Multi-branched molecule
  • Photoluminescence

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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