Photoluminescence and energy transfer study of Er ³⁺ and Dy ³⁺ codoped tellurite glasses

Photoluminescence properties of the Er ³⁺-Dy ³⁺ codoped tellurite glasses were studied by absorption and visible emission spectra, which revealed luminescence bands of both Er ³⁺ and Dy ³⁺ when pumping with the wavelength of 325 nm. The concentration quenching occurred as Dy ³⁺ concentration increased beyond 3 mol%. The dependence of Er ³⁺ characteristic emission on Dy ³⁺ concentration indicated energy transfer process between Er ³⁺ and Dy ³⁺. The chromaticity coordinates of these glasses are close to white light, which implies that these glasses might be potential candidates for white lighting through an appropriate combination.