Synthesis of nano-ZnS modified porous Si with white light photoluminescence properties

Porous silicon (PS) was modified with nano-ZnS using a chemical method. Scanning electron microscopy (SEM) images show that after the modification, smaller nano-ZnS particles 10-50 nm in diameter appear in the PS host. The formation of nano-ZnS in PS was also confirmed by energy dispersive spectroscopy (EDS). The EDS results revealed that the same ratio of Zn and S atoms existed in PS after the deposition of ZnS. Photoluminescence spectra of nano-ZnS/PS structures exhibited a distinct shift of emission from red to blue with increasing ZnS coverage. With appropriate doping, it is possible to obtain white light photoluminescence from nano-ZnS/PS.