Selective excitation of up-conversion luminescence by Yb3+-Er3+ energy transfer in glass and crystalline phase of oxyfluoride glass ceramics

Up-conversion luminescence of oxyfluoride glass and glass ceramics containing LaF3 crystallites doped with Yb3+ and Er3+ was investigated at low temperature. Excitation of Yb3+ in the IR region revealed the fast and the slow components of Er3+ up-conversion luminescence originating from both glass and crystalline phases. The temporal differences of the both kinds of the luminescence allowed reconstructing the excitation spectra of the up-conversion luminescence related to the glass and crystalline phases in the glass ceramics.