Abstract
A novel near-infrared (NIR) emitting phosphor, Ca4Si2O7F2:Ce3+,Er3+ was synthesized by conventional solid state reaction method and characterized with X-ray diffraction, photoluminescence emission, photoluminescence excitation spectra and fluorescence decay measurements. In Ca4Si2O7F2:Ce3+,Er3+ phosphors, intense NIR emission at 1540 nm which is assigned to the characteristic 4I13/2 → 4I15/2 transition of Er3+ along with the broadband emission of Ce3+ at 490 nm was observed under 380 nm excitation. The luminescence spectra, both in visible (VIS) and NIR regions, and lifetime curves of Ce3+ have been measured to prove energy transfer (ET) from Ce3+ to Er3+. Efficient energy transfer from Ce3+ to Er3+ in Ca4Si2O7F2 is observed and leads to about 10 times enhancement of the Er3+-1540 nm emission when excited at 380 nm. The critical distance between Ce3+ and Er3+ ET in Ca4Si2O7F2 host was calculated, as 14.81 Å. The Inokuti-Hirayama (I-H) model is applied in the analysis of the non-exponential fluorescence decay curves. From I-H curve fitting, it is inferred that the electric dipole-dipole interaction is the main process responsible for the energy transfer as well as for the large enhancement of 1540 nm emission. The results indicate that sensitization of Er3+ is possible via 4f-5d transition of Ce3+ in the Ca4Si2O7F2 host.
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