Synthesis and photoluminescence properties of tunable emission phosphors Ca4Si2O7F2:Ce3+

• A series of Ca4Si2O7F2:xCe3+ phosphors were prepared by a solid–state reaction.
• The Ce3+ ions occupy two different lattice sites with 408 and 470 nm emission bands in the host.
• The phosphors Ca4Si2O7F2:xCe3+ show a bright tunable color emission from blue to green-blue under the n-UV light excitation.
• The phosphors can serve as a potential phosphor for n-UV based w-LEDs.

The Ce3+ activated phosphors Ca4Si2O7F2:Ce3+ are prepared by a solid state reaction technique. The UV–vis luminescence properties as well as fluorescence decay time spectra are investigated and discussed. The results revealed that there were two kinds of Ce3+ luminescence behavior with 408 and 470 nm emissions, respectively. Under 355 nm excitation, the Ce(1) emission (408 nm) is dominant at low doping concentration, and then the Ce(2) emission (470 nm) get more important with increasing of Ce3+ concentrations in the host. The phosphors Ca4Si2O7F2:xCe3+ show tunable emissions from blue area to green-blue area under near-ultraviolet light excitation, indicating a potential application in near-UV based w-LEDs.

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