EPR and Optical Studies of Cr (III) Ions Doped NaCaAlPO F Nano Phosphor 4 3

Abstract

Cr(III) ions dopedNaCaAlPO F phosphorwas synthesized by using solid state reaction method using flux. The prepared 4 3 sample was characterized by various spectroscopic techniques such as powder XRD, SEM with EDS, Optical absorption, Electron Paramagnetic Resonance (EPR), Photoluminescence and FT-InfraRed. From powder XRD studies, the average crystallite size was calculated about 86 nm. SEM images showed the irregular shaped particles present in the sample. Optical absorption spectrum gave the absorption bands in UV-VIS region which are the characteristic of Cr(III) ions in octahedral symmetry. The room temperature EPR spectrum exhibited a broad signal centered at g~1.972.Photoluminescence spectrum showed the emission peaks in visible region, from blue to red with an excitation wavelength of 420nm.The CIE chromaticity coordinates were calculated as (x = 0.297, y = 0.356).