Study on micelle stabilized room temperature phosphorescence behaviour of pyrene by laser induced time resolved technique

Room temperature phosphorescence (RTP) decay generally follows a first order exponential law P-t = P(0)e(-t/tau) in the micelle system. The pre-exponential factor (or transient phosphorescence intensity) P-0 and phosphorescence lifetime tau can be used to qualitatively indicate the probability of intersystem crossing (S-1-T-1) (TSC) and radiationless deactivation (T-1-S-1) of the phosphors in micelle system. These two factors indirectly reflect the inducing effect of heavy atoms on the probability of ISC of phosphor and the preservation of micelle to phosphor. In this paper, P, and tau of pyrene were measured by a laser induced time resolved technique. The effects of the concentration of heavy atom species, surfactant SDS, as well as pH, on the above parameters were studied. (C) 1997 Elsevier Science B.V.