Accession Number:

ADA285105

Title:

Photodegradation and Photophysics of Laser Dyes

Descriptive Note:

Final rept. Sep 1989-May 1992

Corporate Author:

BOSTON UNIV MA DEPT OF CHEMISTRY

Personal Author(s):

Report Date:

1994-06-30

Pagination or Media Count:

17.0

Abstract:

The solubilization of laser dyes in water with the aid of the polyelectrolyte, polymethacrylic acid PMAA has been studied. An important strategy was the isolation of dye species in the hypercoils associated with the polyelectrolyte, as it is found a moderately acidic pH. Polymer-bound dyes in water display markedly enhanced emission yield, lifetime, and polarization. Dye materials are also less susceptible to photodegradation, since they are isolated in polymer domains away from adventitious quenchers. Also examined in the study was the possibility that two dyes could be co-bound within polymer domains and that energy transfer between the two would result in downshifting of output emission wavelengths. Of the various amphiphilic media used for solubilizing organic dyes in water e.g., detergent micelles, cyclodextrins, PMAA shows the greatest promise in term of fluorescence enhancement and compartmentalization or organized assembly of additives. These studies show promise for the protection of the dyes against undesirable photodegradation under flash excitation.

Subject Categories:

  • Physical Chemistry
  • Radiation and Nuclear Chemistry
  • Lasers and Masers
  • Coatings, Colorants and Finishes

Distribution Statement:

APPROVED FOR PUBLIC RELEASE