Copper-doped glasses have attracted much attention in materials research for being of interest for optical applications such as luminescence and solid-state lighting, solar energy conversion in photovoltaic cells, optical filters, and nonlinear optics. The extent of the application is inherently connected with the oxidation and aggregation state of copper in the glass hosts. Thus, it is necessary to understand the various physical and chemical parameters that control the states of copper and ultimately the optical properties of the material. With respect to glass hosts, bismuth borate glasses are desirable due to their low phonon energy and low glass transition temperature, and thus have been considered recently for phosphor encapsulation in LEDs. In this work, the influence of CuO doping on bismuth- borate glasses prepared by the melt-quench technique was studied by optical spectroscopy methods. The glasses containing increasing concentration of CuO were co-doped with a fixed amount of Eu2O3 to be used as probe of Cu2+ based on energy transfer interactions between Eu3+ and Cu2+ that lead to the luminescence quenching in Eu3+. Finally, an effort is made to assess the existence of Cu+ in the glasses in connection with optical band gap determinations. It is suggested that the optical basicity of the borate glass matrix supports the occurrence of Cu+ to some extent.

Properties of copper and europium doped bismuth-borate glasses

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

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