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Influence of Li + charge compensator ion on the energy transfer from Pr 3+ to Gd 3+ ions in Ca 9 Mg(PO 4 ) 6 F 2 :Gd 3+ , Pr 3+ , Li + phosphor.

Phototherapy is a renowned treatment for curing skin diseases since ancient times. Phototherapeutic treatment for psoriasis and many other diseases require narrow band ultra violet-B (NB-UVB) light with peak intensity at 313nm to be exposed to the affected part of body. In this paper, we report combustion synthesis of NB-UVB -313nm emitting Ca9 Mg(PO4 )6 F2 phosphors doped with Gd3+ , Pr3+ and Li+ ions. The phase formation was confirmed by obtaining X-ray diffraction (XRD) pattern and morphology was studied with the Scanning electron microscopy (SEM) images. Photoluminescence (PL) emission spectra show intense narrow band emission at 313nm under 274nm excitation wavelengths. Emission intensity was enhanced when Ca9 Mg(PO4 )6 F2 compound is co-doped with Pr3+ ions. Excitation spectra of Ca9 Mg(PO4 )6 F2 :Gd3+ , Pr3+ doped samples shows broad excitation in ultra violet C (UVC) region. Diffuse reflectance spectra (DRS), obtained by UV-visible spectrophotometer, measures the absorption properties of the material. By applying Kubelka Munk function on the diffuse reflectance spectra, band gap of the material is determined. PL decay curves were examined which indicates efficient energy transfer between Pr3+ and Gd3+ ions. Charge compensation effect was also studied by co-doping Li+ ion in host. Emission intensity was found to increase with the addition of charge compensator. The prepared phosphor has potential to convert UVC light into NB-UVB. The luminescence intensity of Gd3+ shows remarkable increase when it is sensitized with Pr3+ , and an addition of charge compensator in the form of Li+ , show even better results. This phosphor surely has the potential to be used as phototherapy lamp phosphor.

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