Abstract: Porous silicon (PS) sample with certain porosity by electrochemical anodization of n.type silicon wafer is prepared，and then ZnS film is deposited on the PS surface by pulsed laser deposition(PLD).ZnS has a broad band gap，and it is transparent for the visible light. Under the proper excitation wavelength，the orange-red light emission from PS layer can transmit through the upper ZnS film，and combines with the blue-green emission from ZnS, forming a broad photoluminescence (PL) band in the visible region，SO intensively white light emission from the ZnS/PS composite system is obtained.The structural properties of the ZnS film on PS substrate are characterized by X.ray diffraction (XRD) and scanning electron microscope(SEM).The results show that，the quality of the ZnS film deposited on PS substrate iS poor。and the film surface is unsmoothed due to the roughness of the PS surface.

Key words: photoluminescence white light emission, pulsed laser deposition ZnS film,  PS, ZnS薄膜, 多孔硅