Intersystem Crossing Rate and Triplet State Lifetime for a Lasing Dye

摘要

Triplet state kinetics for rhodamine 6G in alcohol have been studied. The singlethyphen;tohyphen;triplet intersystem crossing ratekSTand triplet lifetimetgr;Thave been determined in airhyphen;saturated alcohol, where the spinhyphen;forbidden decay from the triplet manifold into the singlet ground state is enhanced by collision with oxygen molecules dissolved in the solution. Values of the kinetic parameters for airhyphen;saturated ethanol solutions at room temperature were determined to betgr;Tthinsp;equals;thinsp;250thinsp;plusmn;thinsp;40nsecandkSTthinsp;equals;thinsp;lpar;3.4thinsp;plusmn;thinsp;1.3rpar;thinsp;times;thinsp;106secminus;1.