Accession Number:

ADA238897

Title:

Photophysics of Laser Dyes in Aqueous Polymer Media

Descriptive Note:

Final technical rept.,

Corporate Author:

BOSTON UNIV MA DEPT OF CHEMISTRY

Report Date:

1991-06-30

Pagination or Media Count:

32.0

Abstract:

The photophysical properties of a series of coumarin laser dyes in an aqueous polyelectrolyte medium have been measured. The binding of the dyes to polymethacrylic acid PMAA in water has been demonstrated through the observation of dramatic blue-shifts of fluorescence bands and increases in emission quantum yield and lifetime and polarization. The systematic changes in fluorescence properties reveal that the hydrophobic dyes reside in relatively nonpolar dry and highly viscous microdomains at lower pH values for aqueous PMAA solutions in which a highly compact conformation of the uncharged polyelectrolyte is important. The transition from the hypercoiled conformation pH 4-8 can be followed readily by reference to coumarin fluorescence wavelength, quantum yield and polarization data.

Subject Categories:

  • Lasers and Masers

Distribution Statement:

APPROVED FOR PUBLIC RELEASE