Chemical size-effects on fluorescence lifetime of Rhodamine 6G in ethylene glycol/water microdroplets dispersed in polydimethylsiloxane matrix

Satoshi Habuchi, Haeng Boo Kim*, Noboru Kitamura

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

The fluorescence dynamics of Rhodamine 6G (R6G) in ethylene glycol/water (EG/W) microdroplets dispersed in apolydimethylsiloxane (PDMS) solid matrix were studied by picosecond time-resolved microspectroscopy. The large decrease in the fluorescence lifetime of R6G was observed for the droplets with the diameter (d) below 10μm and at the R6G concentrations ([R6G]) above 0.1 mM. Absorption microspectroscopy revealed that the dimer formation of R6G in EG/W microdroplets was facilitated with decreasing d and increasing [R6G]. The size-dependent fluorescence lifetime of R6G was related to quenching of the monomer excited state by the R6G dimer. The origin of size-dependent dimer formation and, thus, the size-dependent fluorescence lifetime of R6G in micrometer-sized droplets in the PDMS matrix was discussed in detail.

Original languageEnglish (US)
Pages (from-to)189-196
Number of pages8
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume133
Issue number3
DOIs
StatePublished - May 22 2000

Keywords

  • Ethylene glycol/water
  • Polydimethylsiloxane
  • Rhodamine 6G

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Chemical size-effects on fluorescence lifetime of Rhodamine 6G in ethylene glycol/water microdroplets dispersed in polydimethylsiloxane matrix'. Together they form a unique fingerprint.

Cite this