Preparations and luminescent properties of PbS nanoparticle phosphors incorporated in a SiO2 matrix

M. S. Dhlamini, J. J. Terblans, O. M. Ntwaeaborwa, H. D. Joubert, H. C. Swart

Research output: Contribution to journalConference articlepeer-review

5 Citations (Scopus)


A synthetic route for the preparation of luminescent PbS nanoparticles encapsulated in SiO2 at room temperature by the sol-gel process is presented. The particle size and morphology of the PbS nanoparticles were observed by transmission electron microscopy (TEM). The particle sizes were estimated from the X-ray diffraction (XRD) peaks using the Scherrer's equation. The measured particle sizes were in the range of 10 to 50 nm inside the SiO 2 matrix. The cathodoluminescence (CL) measured with a Fiber Optics PC2000 spectrometer showed the emission peak to be at the wavelength of 680 nm. The phosphor was degraded in an oxygen atmosphere. The chemical composition of the prepared samples was analyzed by an energy dispersive spectrometer (EDS). Xray photoelectron spectrometer (XPS) was used to measure the surface chemical composition of the SiO2:PbS nanoparticles before and after electron degradation. XPS analysis on the degraded spot showed the development of characteristic SiO, SiOx and elemental Si peaks on the low-energy side of the SiO2 peak. The desorption of O2 from the surface,which resulted in a decrease in the CL intensity is attributed to the dissociation of SiO2 into elemental Si and O by the electron bombardment. The degradation was less severe at higher oxygen pressures. PbSO4 was also formed on the surface during the electron beam degradation process.

Original languageEnglish
Pages (from-to)598-601
Number of pages4
JournalPhysica Status Solidi (C) Current Topics in Solid State Physics
Issue number2
Publication statusPublished - 2008
Externally publishedYes
EventE-MRS 2007 Spring Meeting-Symposium F - Novel Gain Materials and Devices Based on III-N-V Compounds - Strasbourg, France
Duration: 28 May 20071 Jun 2007

ASJC Scopus subject areas

  • Condensed Matter Physics


Dive into the research topics of 'Preparations and luminescent properties of PbS nanoparticle phosphors incorporated in a SiO2 matrix'. Together they form a unique fingerprint.

Cite this