Effect of CuO Added to Aluminosilicate Phosphate Geopolymer, Structure and Optical Properties Analysis.

Our work reports a new route for the fabrication and determination of optical properties of copper ceramic glasses in the CuO-Al₂O₃-P₂O₅-SiO₂ system. With DRX and Raman spectroscopy the phase composition of these materials was found. Research study shows dispersions of AlPO₄ polymorphs crystals in a matrix of copper-silicate glass. All absorption peaks observed in the UV–Visible spectrum confirm the composition of the synthesized cluster deduced by the XRD result. A wide band gap exceeding 3.5 eV of synthesized compound was recorded. It appears that the addition of CuO influences the structure of the material, because it leads to the formation of new types of environments which caused the change from the dielectric state to the semiconductor state. When excited with 375 nm light, the obtained system exhibits bright blue-violet, green and orange emissions in aggregated states, which perfectly constitute the building blocks of white light. This emission which is in the saturated white light region with CIE chromaticity coordinates of (0.3148, 0.3316) was obtained. Our study provides a flexible and simple fabrication process for new materials with optical properties that make them good candidates for application in a white light-emitting device. [ABSTRACT FROM AUTHOR]