Synthesis and luminescent properties of star-burst D-π-A compounds based on 1,3,5-triazine core and carbazole end-capped phenylene ethynylene arms

Zheng Zhang, Rui Liu, Xiaolin Zhu, Yuhao Li, Jin Chang, Hongjun Zhu, Liangwei Ma, Wangjie Lv, Jun Guo

Research output: Contribution to journalArticlepeer-review

Abstract

Two new star-burst compounds based on 1,3,5-triazine core and carbazole end-capped phenylene ethynylene arms (1a and 1b) were synthesized and characterized. Their photophysical properties were investigated systematically via spectroscopic and theoretical methods. Both compounds exhibit strong 1π-π* transitions in the UV region and intense 1π-π*/intramolecular charge transfer (1ICT) absorption bands in the UV-vis region. Introducing the carbazole end-capped phenylene ethynylene arm on the 1,3,5-triazine core causes a slight bathochromic shift and enhanced molar extinction coefficient of the 1π- π*/1ICT transition band. Both compounds are emissive in solution at room temperature and 77 K, which exhibit pronounced positive solvatochromic effect. The emitting state could be ascribed to 1ICT state in more polar solvent, and 1π-π* state in low-polarity solvent. The high emission quantum yields (Φem=0. 90~1.0) of 1a and 1b (in hexane and toluene) make them potential candidates as efficient light-emitting materials. The spectroscopic studies and theoretical calculations indicate that the photophysical properties of these compounds can be tuned by the carbazole end-capped phenylene ethynylene arm, which would also be useful for rational design of photofunctional materials.

Original languageEnglish (US)
Pages (from-to)130-136
Number of pages7
JournalJournal of Luminescence
Volume156
DOIs
StatePublished - Jan 1 2014

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Atomic and Molecular Physics, and Optics
  • Chemistry(all)
  • Biochemistry
  • Condensed Matter Physics

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