Correlation Between the Possibility of Laser Action and the Oscillator Strength of the Fluorescent Transition: Pyrylium Salts

摘要

Laser action is demonstrated to occur in seven pyrylium salts between 4100 and 5100 A with quantum yields extending from 4% to 12%. Theoretical calculations of the energy and oscillator strength of S/sub O/ implies S/sub n/ transitions confirm band assignments deduced from experimental results. These results allow detection of a weak hidden transition in the 2,6-dimethyl-4-phenyl-pyrylium cation where laser action is not observed. This shows how important the magnitude of the oscillator strength of the first transition S/sub O/ implies S/sub l/ is in selecting candidates to laser action. (ERA citation 10:044885)