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Preparation of CaF2 based phosphors by solid state metathesis |
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| Authors: | NS UgemugeDS Tajne SM DhoptePL Muthal SV Moharil |
| Institution: | a Department of Applied Physics, Priyadarshini College of Engineering and Technology, Nagpur, India b National Environmental Engineering Research Institute, Nehru Marg, Nagpur, India c Department of Physics, R.T.M. Nagpur University, Nagpur 440010, India |
| Abstract: | Synthesis of CaF2:Eu and CaF2:Ce phosphors by solid state metathesis is reported for the first time. CaF2 could be prepared in few minutes using domestic microwave oven. Though CaF2 is formed by metathesis, luminescence centres were not formed in one step; as-prepared samples did not show any luminescence. Samples reduced at 1000 °C for 1 h exhibited very intense, characteristic emission. Activator concentration, and in turn, the intensity of luminescence depends on the partition coefficient of the activator in the host and the washable reaction products (KCl in the present case). In case of Europium, most of the activator is retained by CaF2 while for Cerium a significant fraction of the added activator is washed away with KCl. |
| Keywords: | Fluorite Calcium fluoride Photoluminescence Metathesis |
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