Optical absorption spectrum of Cu2O–CaO–P2O5 glasses

Abstract

Homogeneous CaO-P2O5 and Cu2O-CaO-P2O5 glasses were prepared using a meltquenched method under controlled conditions. The binary glasses were found to be colourless and transparent while the ternary glasses changed from light green to dark green as the Cu2O content increased. From the absorption edge studies, the values of the optical band gap, Eopt and Urbach energy, ΔE were evaluated. The position of the absorption edge and hence the optical band gap were found to depend on the glass composition. Analysis of the optical band gap shows that for the binary glasses, the value increases as the content of CaO decreases, while for the ternary glasses, the value of the optical band gap increases as the content of the Cu2O decreases. The density of the glasses was also measured and was found to increase with the increase in CaO and Cu2O contents.

Temperature Dependent Spectroscopic Properties of Cu+ and Dy3+ Co‐Doped Phosphate Glass: Band Gap Analysis and Cu Nanocluster‐Enhanced Dy3+ Luminescence

“…From a fundamental standpoint, the absorption properties of Cu + ions embedded in dilute form in glasses have been observed to impact the ultraviolet (UV) region due to parity‐forbidden 3d 10 →3d 9 4s 1 transitions which are partially allowed in solids as documented by various researchers ,,. Yet, for relatively high concentrations, significant red shifts in the absorption edge of the Cu‐doped glasses have been recognized . Bae and Weinberg [11] studied CuO‐P 2 O 5 glasses and acknowledged that the broad absorption from monovalent copper overlaps the fundamental absorption edge of the matrix and therefore the tail of absorption is determined mostly by the absorption from the Cu + ions.…”

“…Bae and Weinberg [11] studied CuO‐P 2 O 5 glasses and acknowledged that the broad absorption from monovalent copper overlaps the fundamental absorption edge of the matrix and therefore the tail of absorption is determined mostly by the absorption from the Cu + ions. Later on, other researchers investigated on the influence of the copper oxide dopant in phosphate glasses, and similarly analyzed the glass absorption edge shifts in the context of optical band gaps . These reports have interpreted the red shifts in glass absorption edge in terms of an increase in the number of non‐bridging oxygens in the glass matrix .…”

Influence of Ag2O on some physical properties of LiF–TiO2–P2O5 glass system

“…In recent years, there has been an enormous amount of research on improving the physical properties and the chemical durability of phosphate glasses by introducing a number of glass formers and modifiers such as V 2 O 5 , Cr 2 O 3 , Fe 2 O 3 , Al 2 O 3 , Ga 2 O 3 , Sb 2 O 3 , etc., into P 2 O 5 glass network [1][2][3][4][5][6][7][8][9][10]. Among various such metal oxides, TiO 2 is expected to be more effective in improving the chemical durability of the phosphate glasses.…”

Linear Optical Properties of Zinc Borotellurite Glass Doped with Lanthanum Oxide Nanoparticles for Optoelectronic and Photonic Application

“…The presence of bridging oxygen in the glassy network is attributed to the increment of values [38]. Hence, the incorporation of La 2 O 3 NPs into the glass network has made it harder for the electrons to move within the fabricated materials [39]. The drastic decrement of energy band gap value may result from a significant structural change that occurred in the glass system at glass sample with 0.03 molar fraction of La 2 O 3 NPs [40].…”