Abstract
Room temperature phosphorescence (RTP) decay generally follows a first order exponential law P t= P 0e −t/ τ in the micelle system. The pre-exponential factor (or transient phosphorescence intensity) P 0 and phosphorescence lifetime τ can be used to qualitatively indicate the probability of intersystem crossing ( S 1- T 1) (ISC) 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 0 and τ 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.
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