STRUCTURAL ANALYSIS AND PHOTOLUMINESCENCE PROPERTIES OF Er3+ DOPED SrBi2Nb2O9 FERROELECTRIC CERAMIC

Abstract

The polycrystalline SrBi2Nb2O9 (SBN) and Er3+ doped SrBi2-xNb2ErxO9 (x = 0.00, 0.01, 0.02, 0.03, 0.04, 0.05) ceramics at these different concentrations were synthesized by conventional solid-state method. The pure SBN underwent heat treatment at different calcination temperatures: 8000C, 8500C, and 9500C, and the evolution of phases were studied at these different calcination temperatures. At 9500C, no traces of secondary phases were seen in pure SBN thus Er3+ doped SrBi2-xNb2ErxO9 at different concentrations were calcined at this temperature followed by sintering of all the samples at 10000C of temperature. Few secondary phases have been identified along with the desired SBN phase but begin to decrease with the increase in the calcination temperature. confirms the formation of single-phase material with orthorhombic structure. From XRD analysis of pure and Er3+ doped SrBi2-xNb2ErxO9 (x = 0.00, 0.01, 0.02, 0.03, 0.04, 0.05) with an increasing content of Erbium (Er3+), an increase in the lattice parameters and unit cell volume was observed. The structural morphology of pure and Er3+ doped SBN, sintered at 10000C were investigated under SEM revelled the formation of the highly dense grains with more pores and non-uniform grain size and EDS provides information about the elemental composition. The Raman analysis revealed the formation of the orthorhombic phase of pure SBN. The photoluminescence properties for Er3+ doped SrBi2-xNb2ErxO9 (x = 0.00, 0.01, 0.02, 0.03, 0.04, 0.05) at different concentrations were also investigated. Strong green emission at 549.8 nm was seen at an excitation wavelength, λex = 480 nm at room temperature for an Er content (x = 0.03), attributed to 4S3/2→4

I15/2 transitions.