Fluorescence properties of hybrid CdTe quantum dots-porphyrins thin films in organic vapors

Abstract

This paper reports a study on the fluorescence properties of thin films utilizing quantum dots (QDs) of cadmium telluride (CdTe) hybridized with porphyrins (tetraphenyl porphine cobalt (II)) (CoTTP) thin films under exposure of various gases. The high yellow luminescence QDs were synthesized using a wet-chemical process at moderate temperature (350°C). CdTe QDs, CoTTP porphyrin and CdTe-CoTTP hybrid thin films were deposited onto the surface of fiber optic probe and dried in the ambient temperature. The quantum dots showed their ability to activate photo luminescence property of porphyrin molecules in the hybrid thin film of quantum dots-porphyrin. The fluorescence properties of thin films were studied by observing the change of photoluminescence (PL) spectra of thin films in nitrogen (N2) and after exposing in various organic gases. The PL quenching effect was occurred for both PL peaks for QDs and CoTTP in the hybrid thin film. © 2010 American Institute of Physics.