• Satisha. K.N.
• Dr. Chikkahanumantharayappa
• Dr. B.M. Manohara
• Dr. B.M. Nagabhushana

(1-7 mol %) Cr3+ doped Calcium silicate nanophosphor was synthesized by a combustion technique. The final product was well characterized by powder X-ray diffraction (PXRD), Field emission scanning electron microscopy (FESEM), Fourier Transform Infra-red spectroscopy (FTIR) and UV Visible optical absorption study of the sample was obtain diffused reflectance spectra (DRS). The PXRD results show that the sample was well crystallized with monoclinic phase. The average crystallite size was estimated using Debye- Scherer’s formula, Williamson–Hall (W–H) plots and size-strain plot and was found to be in the range (38 – 52) nm. The energy band gap (Eg) of the samples was estimated using Kubelka- Munk method and found to be in the range from (3.4 – 3.5) eV. Photoluminescence (PL) studies show an intense emission peak at 705 nm when excited at 323 nm, which corresponding to 2Eg → 4A2g transition of R-line of chromium. It is observed that PL intensity increases with increase in Cr3+ concentration and highest PL intensity is observed for 5 mol % doped sample and thereafter it decrease with further increase in Cr3+ concentration and this is understood by concentration quenching due to cross relaxation. The Commission International De I-Eclairage (CIE) and Coordinated Color Temperature (CCT) of all the phosphors were well located in red region, which was highly potential phosphor for the fabrication of red component of white light, Also display applications.

Combustion technique, Energy Band gap, Photoluminescence, Quenching, CCT,

"Spectroscopic and luminescence studies of Cr3+ doped Calcium silicate nanophosphor ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 5, page no.655-663, May-2019, Available :http://www.jetir.org/papers/JETIR1905G94.pdf

"Spectroscopic and luminescence studies of Cr3+ doped Calcium silicate nanophosphor ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 5, page no. pp655-663, May-2019, Available at : http://www.jetir.org/papers/JETIR1905G94.pdf