Photoluminescence analysis on vacuum deposited PbSe multilayer thin films

摘要

Lead Selenide multilayer thin films were prepared by thermal evaporation technique by successive coatings of lead and Selenium metals. Polycrystalline nature of as deposited films observed from X-Ray diffraction method with the crystalline size of 17 nm. The absorption edge towards blue wavelength clearly indicates the presence of nano particles trapped at interface of the successive Lead and Selenium layers. The room temperature photoluminescence analysis of the films with different excitation wavelengths ranges from 300-450 nm shows the green and red emission bands .The Stokes shift varies from 1.57-1.62 eV observed at exciting energy of 4.14 eV and the results were discussed in this paper.