Investigation of (Ba(1.6-3/2x) Sr2.4Na2Nb10O30:xHo3+) tungsten bronze structured ferroelectric nanomaterial for optoelectronic application

Abstract

This paper aimed to report a study on the optical and photoluminescence behaviors of rare earth holmium ion additive barium strontium sodium niobate tungsten bronze structured ferroelectrics nanomaterials, produced by conventional high temperature solid-state reaction methods. Carbonates and oxides from Sigma-Aldrich were used as precursor.The investigation included, XRD, UV–Vis, PL and FT-IR to examine the phase, absorption, emission & functional groups respectively. Tetragonal tungsten bronze structured crystallite phase was obtained from the XRD pattern results which match with the JCPDS card No −00–039-1453. It has a space group of p4bm and lattice parameters, a = b = 12.3 Å & c = 3.9 Å. UV–Vis revealed that the maximum absorption occurred at wavelength of 205 nm having highest intensity value obtained for the amount of 0.03 Ho³⁺ and diminished in both right and left sides of the concentration amounts. The PL result displayed the maximum emission spectra (322.8 a.u.) centered at wavelength of 572 nm for the excitation wavelength of 285 nm for 0.03 Ho³⁺ indicating high dipole transition that can enhance the ferroelectric property showing the important effect of the dopant since we obtained minimum intensity for no dopant and excess dopants (0.10) Ho³⁺ concentration. For the non-doped cation oxide FT-IR outputs displayed a single vibration mode at wavenumber 540.6 cm⁻¹. It has an intense collective cation oxide peak alone with no any external impurities. When the amount of Ho³⁺ equal to 0.05 another new peaks were obtained at wave number 429.92 cm⁻¹; confirming the presence for holmium-oxygen bond vibration modes that ensure in turn its existence as dopants as seen in EDS. Moreover, the synthesized nanomaterial is highly promising for optoelectronic; good absorption and nice band gap useful for enhanced storage and PL applications as the results obtained from characterized parameters clearly indicated.