A blue-white-yellow color-tunable excited state intramolecular proton transfer (ESIPT) fluorophore: Sensitivity to polar-nonpolar solvent ratios

Ken Ichi Sakai, Takaaki Ishikawa, Tomoyuki Akutagawa

Research output: Contribution to journalArticle

80 Citations (Scopus)

Abstract

We report the emission wavelength tunability of an excited state intramolecular proton transfer (ESIPT) fluorophore, 2,4-dibenzothiazolylphenol (2,4-DBTP), and its application to white light generation. In a nonpolar solvent, yellow fluorescent 2,4-DBTP had a maximum emission around 560 nm, but did not absorb light in the blue region (400-500 nm) because of its large Stokes shift. In a polar solvent, however, a phenol proton of 2,4-DBTP involving in ESIPT is dissociated by solvent molecules, giving rise to blue emission. By dissolving the fluorophore in a polar-nonpolar solvent mixture, we observed white emission with a broad band ranging from 400 to 650 nm, a consequence of the small overlap between the absorption spectrum of the yellow-emitting form and the fluorescence spectrum of the blue-emitting form. We also successfully fabricated a white-emitting polymer film using yellow-emitting 2,4-DBTP and a representative blue fluorescent dye (perylene) as dopants. Our fluorophore will be useful for environmentally sensitive fluorescent probes and white organic light-emitting diodes.

Original languageEnglish
Pages (from-to)7866-7871
Number of pages6
JournalJournal of Materials Chemistry C
Volume1
Issue number47
DOIs
Publication statusPublished - 2013 Dec 21

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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