Synthesis and spectral investigations of Mn(II) ions doped NaCaAlPO₄F₃ phosphor

Department of Physics, University College of Sciences, Acharya Nagarjuna University, Nagarjuna Nagar - 522510, India

^a e-mail: rvssn@yahoo.co.in

Received: 7 June 2013
Revised: 19 November 2013
Accepted: 27 November 2013
Published online: 6 January 2014

Abstract

Mn(II) ions doped NaCaAlPO₄F₃ phosphor was synthesized by using solid state reaction method. The prepared sample was characterized by various spectroscopic techniques such as powder XRD, SEM with EDS, Optical absorption, electron paramagnetic resonance (EPR) and photoluminescence. From powder XRD, the average crystallite size was calculated about 46 nm. SEM images showed the irregular shaped entities present in the sample. Optical absorption spectrum gave the absorption bands in UV-VIS region which are the characteristic of Mn(II) ions in octahedral symmetry. The room temperature EPR spectrum exhibited a six weak hyperfine splitting lines centered at g = 2.0. Photoluminescence spectrum showed the emission peaks in visible region, from yellow to red with an excitation wavelength of 465 nm. From the emission spectral data, the CIE chromaticity coordinates were also calculated as (x = 0.661, y = 0.338).