Photoluminescence and energy transfer studies of Er3+ and Dy3+ co-doped tellurite glasses

This paper reports on luminescence property of the Er³⁺-Dy³⁺ co-doped tellurite glasses. The samples are studied by absorption and visible emission spectra. The measured emission spectrum of Er³⁺-Dy³⁺ glass has revealed luminescence bands of both Er³⁺ and Dy³⁺ when pumping with the wavelength of 325 nm. The concentration quenching occurred as Dy³⁺ concentration increased beyond 3 mol%. The characteristic emission band of Er³⁺ was influenced by the Dy³⁺ concentration increasing. The energy transfer (ET) process between Er³⁺ and Dy³⁺ occurred. The chromaticity coordinates of these samples are close to white light, which implies that the glasses might be a potential candidate for white lighting through an appropriate combination.