Abstract
Structural, spectroscopic and optical properties of lead tellurite glass ceramics doped with variable amounts of erbium ions and codoped with fixed amounts of silver (Ag2O or Ag metallic nanoparticles, AgNPs) have been studied. The investigation of the samples was performed by X-ray diffraction (XRD), Fourier transform infrared (FTIR), diffuse reflectance ultraviolet–visible (DR-UV–vis) and photoluminescence (PL) spectroscopies. The average unit-cell parameter, crystallite size and the quantitative ratio of the crystallographic phases in the samples were evaluated from the XRD data. FTIR spectroscopy data show that the glass ceramics network mainly consists of TeO3 and TeO4 structural units. The increase of the Er2O3 content determines a TeO3→TeO4 conversion but the process is also influenced by the nature of the codopant (Ag2O or AgNPs) present in the samples. The optical band gap (Egopt) values, determined from the DR-UV–vis spectra, decrease with increasing the erbium content of the samples. Photoluminescence spectroscopy measurements evidenced the important peaks located at around 430nm and 708nm due to the Pb2+ ions and at 525 and 547nm due to the Er3+ ions present in the studied samples. The Er3+:Ag codoping was found to produce antagonistic effects (quenching/enhancement) of the luminescence emission of Er3+ ions in the studied samples.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
