White light emission of Dy3+-doped and Dy3+:Yb3+-codoped oxyfluoride glass ceramics under 388-nm excitation

Dy3+-doped and Dy3+:Yb3+-codoped oxyfluoride glass ceramics have been prepared by high-temperature solid phase sintering method. The micrographs of scanning electron microscope show that a lot of nanorods are formed on the surface of Dy3+:Yb3+-codoped sample. The excitation spectra and emission spectra are measured, respectively, and intense photoluminescence peaks at 482 and 575nm corresponding to the transitions of Dy3+ ions are found in single-doped samples under 388-nm excitation. For Dy3+:Yb3+-codoped oxyfluoride glass ceramics, the intensities at blue and green bands become weaker whereas the intensity at 695nm gets stronger. The indirect sensitization is detailedly discussed and Commission Internationale de lE-clairage chromaticity coordinates exhibit that two kinds of oxyfluoride glass ceramics are available candidates for the solid-state white light emission.