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 language | English (US) |
|---|---|
| Pages (from-to) | 189-196 |
| Number of pages | 8 |
| Journal | Journal of Photochemistry and Photobiology A: Chemistry |
| Volume | 133 |
| Issue number | 3 |
| DOIs | |
| State | Published - May 22 2000 |
| Externally published | Yes |
Keywords
- Ethylene glycol/water
- Polydimethylsiloxane
- Rhodamine 6G
ASJC Scopus subject areas
- General Chemistry
- General Chemical Engineering
- General Physics and Astronomy