Absorption Spectroscopy Analysis of Calcium–Phosphate Glasses Highly Doped with Monovalent Copper

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

CaO–P2O5 glasses with high concentrations of monovalent copper ions were prepared by a simple melt–quench method through CuO and SnO co-doping. Spectroscopic characterization was carried out by optical absorption with the aim of analyzing the effects of Cu+ ions on the optical band-gap energies, which were estimated on the basis of indirect–allowed transitions. The copper(I) content is estimated in the CuO/SnO-containing glasses after the assessment of the concentration dependence of Cu2+ absorption in the visible region for CuO singly doped glasses. An exponential dependence of the change in optical band gaps (relative to the host) with Cu+ concentration is inferred up to about 10 mol %. However, the entire range is divided into two distinct linear regions that are characterized by different rates of change with respect to concentration: 1) below 5 mol %, where the linear dependence presents a relatively high magnitude of the slope; and 2) from 5–10 mol %, where a lower magnitude of the slope is manifested. With increasing concentration, the mean Cu+−Cu+ interionic distance decreases, thereby decreasing the sensitivity of monovalent copper for light absorption. The decrease in optical band-gap energies is ultimately shown to follow a linear dependence with the interionic distance, suggesting the potential of the approach to gauge the concentration of monovalent copper straightforwardly in amorphous hosts.

Original languageEnglish (US)
Pages (from-to)1642-1646
Number of pages5
JournalChemPhysChem
Volume17
Issue number11
DOIs
StatePublished - Jun 3 2016
Externally publishedYes

Keywords

  • absorption
  • amorphous materials
  • glasses
  • optical properties
  • transition metals

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry

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