Photodegradation of Coumarin Laser Dyes. An Unexpected Singlet Self-Quenching Mechanism.

Abstract

Photolysis of aminocoumarine laser dyes, including 7-diethylamino-4-methyl-coumarin has been investigated. Dealkylation of groups at the 7-dialkylamino functionality, reduction of the lactone moiety and overall photodecomposition of dyes have been observed. Concentration quenching of dye fluorescence is important at concentrations above 0.01 M. The photolysis is ascribed to singlet self quenching; triplet states are formed in low yield (flash photolysis) and are not reactive. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Oct 31, 1983
Accession Number
ADA136339

Entities

People

  • G. Jones Ii
  • W. R. Bergmark

Organizations

  • Boston University

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Chemical Compounds
  • Chemical Synthesis
  • Chemistry
  • Chloroform
  • Coumarins
  • Dye Lasers
  • Dyes
  • Electron Transfer
  • Electrons
  • Laser Dyes
  • Lasers
  • Organic Chemistry
  • Photochemistry
  • Photodecomposition
  • Photolysis
  • Quantum Yields
  • United States

Fields of Study

  • Chemistry

Readers

  • Chemistry (specifically Chemical Fluorescence)
  • Polymer Science and Technology

Technology Areas

  • Directed Energy
  • Directed Energy - Lasers