Photoluminescence properties of Ce3+ and Mn2+-activated Ba9Sc2Si6O24 phosphor for white light emitting diodes

摘要

A single-phased silicate compound (Ba1-xCex)9(Sc1-yMny)2Si6O24 was prepared by solid-state reaction at high temperature.From powder X-ray diffraction (XRD) analysis,the formation of Ba9Sc2Si6O24 with an R3 space group was confirmed.In the photoluminescence spectra under ultraviolet (UV) ray excitation,the Ba9Sc2Si6O24:Ce3+,Mn2+ phosphor emits two distinctive color light bands:a blue one originating from Ce3+ and a red one caused by Mn2+.The energy transfer process from Ce3+ to Mn2+ was confirmed,the critical radius as well as the transfer efficiency was calculated,and the energy transfer mechanism was discussed.In addition,the decay-time testing indicates that the energy transfer efficiencies from Ce(1) to Mn2+ and Ce(2) to Mn2+ are different.The emission chromaticity of Ba9Sc2Si6O24:Ce3+,Mn2+phosphor could be tuned from blue to red by altering the Ce3+/Mn2+ concentration ratio.