Synthesis, luminescence and EPR studies on CaSiO< sub> 3: Pb, Mn nano phosphors synthesized by solution combustion method (original) (raw)

2012

Abstract

ABSTRACT Nano-ceramic phosphorCaSiO3 doped with Pb and Mn was synthesized by the low temperature solution combustion method. The materialswere characterized by Powder X-Ray Diffraction (XRD),Thermo–gravimetric and Differential Thermal Analysis(TG–DTA), ScanningElectronMicroscopy(SEM)andTransmissionElectronMicroscopy(TEM).TheElectronParamagneticResonance (EPR) spectrumoftheinvestigatedsampleexhibitsabroadresonancesignalcenteredat g¼1.994. Thenumberofspinsparticipatingin resonance (N) and its paramagnetic susceptibility(w) have been evaluated.Photoluminescence of doped CaSiO3 was investigated when excited byUVradiationof256nm.Thephosphorexhibitsanemissionpeakat353nmintheUVrangeduetoPb2þ. Further,abroad emission peakinthevisiblerange550–625nmcanbeattributedto 4T1-6A1 transition ofMn2þ ions. The investigation reveals that doping perovskite nano-ceramics with transition metal ions leads to excellent phosphor materials for potential applications.

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