Medium Effects on Fluorescence Quantum Yields and Lifetimes for Coumarin Laser Dyes.

Abstract

Fluorescence quantum yields and lifetimes for a series of aminocoumarin laser dyes have been measured. The characteristics red shift of fluorescence in polar solvents is accompanied by a marked decrease in emission yield and lifetime for coumarins in which the substituted amine group at the 7-position is free to rotate. Strong emission is maintained in structurally rigid dyes. The non-radiative decay rates for non-rigid dyes which increase in polar solvents are associated with relaxation of emissive planar dye conformations to twisted zwitterionic species. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1980
Accession Number
ADA081748

Entities

People

  • Arthur M. Halpern
  • Guilford Jones Ii
  • William R. Jackson

Organizations

  • Boston University

Tags

DTIC Thesaurus Topics

  • Acetonitrile
  • Alcohols
  • Charge Transfer
  • Chemical Synthesis
  • Chemistry
  • Coumarins
  • Dyes
  • Emission
  • Emission Spectra
  • Fluorescence
  • Glycerols
  • Laser Dyes
  • Lasers
  • Nitriles
  • Organic Chemistry
  • Quantum Yields
  • Sugar Alcohols

Fields of Study

  • Physics

Readers

  • Chemistry (specifically Chemical Fluorescence)
  • Control Systems Engineering.
  • Organic Chemistry

Technology Areas

  • Directed Energy
  • Directed Energy - Lasers
  • Quantum Computing