Nanoparticls of CdS, CdSe, ZnS and ZnS:Mn2+ were synthesized by thermal treatment, using autoclave method using sodium oleate as effective stabilizers. Photoluminescence of the synthesized nanoparticles showed wavelength modification into visible region when excited at UV light. The lifetime of a film. such os PVA and LDPE is reduced by a degradation of the double bonds of C=O and C=C in. the polyolefin films by ultraviolet (UV). As a results, the physical properties of the films are changed, This -is suppresed. by doping wavelength modifying nanoparticles into the, films to absorb UV light which gives damage on films. Absorption, fluorescence, X-ray diffraction and transmission. electron,microscopy were employed for the characterization.