Effect of CuO doping on structural features, optical absorption and photoluminescence behavior of ZnO-based glasses

Abstract

Glasses composed of ZnO–SiO2–B2O3–In2O3 with the addition of different content of CuO were prepared by a popular melt–quenching methodology. The effect of the addition of copper oxide in the glass network was investigated using density, FTIR spectroscopy, optical absorption, and photoluminescence spectroscopy. By increasing the concentration of CuO, a decrease in the density is observed, indicating structural changes in the glass network. The structural building units of glasses are $${\mathrm{BO}}_{3}$$ BO 3 ,$${\mathrm{BO}}_{4}$$ BO 4 , and $${\mathrm{ZnO}}_{4}$$ ZnO 4 according to the FTIR spectra. The absorption spectra of these glasses reveal a distinct broad band at 744 nm due to 2$${\mathrm{B}}_{1\mathrm{g}}$$ B 1 g → 2$${\mathrm{B}}_{2\mathrm{g}}$$ B 2 g characteristic transition of cupric ion in the distorted octahedral sites. The optical band gap energies ($${E}_{\mathrm{g}}$$ E g ) and refractive indices of the studied glasses were also evaluated using the ASF, DASF, and Tauc techniques which revealed that (Eg) values are in gradual decrease with a rise content of CuO. The photoluminescence analysis including emission and CIE chromaticity of the prepared samples were carried out. The emission spectra supported divalent state of copper ions in a distorted octahedral geometry of the glass network upon UV excitation at 270 nm. These results may suggest the material of glass as a potential candidate in the photonics applications.

Antibacterial Biomaterial Based on Bioglass Modified with Copper for Implants Coating

“…Therefore, the PL spectra indicate the existence of both Cu + and Cu 2+ ions, contributing to the observed emission peaks. It was also observed that with the increase in CuO concentration, the PL intensity decreased; this is attributed to the loss of excited energy from copper ions to the host lattice [51]. The decrease in the PL intensity with higher concentration made the PL signal of the Cu8 sample indistinguishable from the noise.…”

“…The luminescence peak at 475 nm is associated with the 3d 9 4s 1 -4s 2 3d 10 transition of Cu 2+ ions [51,53]. The shoulder peak at 523 nm is a consequence of the transition from the degraded T 1g and T 2g levels to the 1 A g energy level of the Cu + copper ions [51,54]. This transition arises from the interaction between NBOs with the Cu 2+ .…”

“…Ultraviolet excitation induces significant and wide emission peaks in the visible range in copper-containing glasses, and it is worth noting that copper can be introduced into the glass network in two different oxidation states, Cu 2+ and Cu + [49,50]. The excitation bands of these ions are located in the UV region [51,52]. The spectral analysis revealed the presence of one main peak at around 475 nm, accompanied by a shoulder at 523 nm.…”

“…The spectral analysis revealed the presence of one main peak at around 475 nm, accompanied by a shoulder at 523 nm. The luminescence peak at 475 nm is associated with the 3d 9 4s 1 -4s 2 3d 10 transition of Cu 2+ ions [51,53]. The shoulder peak at 523 nm is a consequence of the transition from the degraded T1g and T2g levels to the 1 Ag energy level of the Figure 3 displays the photoluminescence (PL) spectra of the glass samples modified with copper upon excitation at 280 nm.…”

“…The decrease in the PL intensity with higher concentration made the PL signal of the Cu8 sample indistinguishable from the noise. Cu + copper ions [51,54]. This transition arises from the interaction between NBOs with the Cu 2+ .…”