Er-Doped Nanostructured BaTiO3 for NIR to Visible Upconversion

Abstract

Photoluminescent mechanisms in erbium-doped barium titanate nanoparticle systems were studied. Er3+ ions were introduced into the BaTiO3 lattice by the sol-gel method. The resulting Er3+ concentration was between 0% and 5%, with Ba/Ti ratios of 1.008 and 0.993. The stoichiometry of Ba and Ti concentrations in the lattice influenced the doping mechanism and placement of erbium ions in the lattice structure. Our research shows the existence of a strong correlation between Ba/Ti ratios, erbium concentration, phase structure and doping site location on the upconversion photoluminescence mechanisms. Competing upconversion emissions 2H11/2/4S3/2→4I15/2 at 523 and 548 nm respectively and other photoluminescent mechanisms as 4I9/2→4I11/2 around 4000 nm (2500 cm−1) were studied using Raman and emission spectroscopy. The upconversion process is predominant over other photoluminescent decay when the material presents high distortion in the surrounding activator.

Giant effect on structural, magnetic, electrical, and optical properties of lead-free Ba0.6Sr0.4Ti1-xAlxO3 ceramics via Sr and Al Co-doping engineering

“…Also, An absorption band observed in the low-frequency region of 450 cm −1 to 850 cm −1 was attributed to vibrations (vibrations of the TiO 6 octahedron) of the Ti-O isopropoxide. Therefore, the appearance of a sharp absorption peak at 560 cm −1 confirms the vibration of the Ti-O bond [74,75]. It is observed from the FTIR spectrum that the wavenumber of the sharp absorption peak shifts to the upper side with an increase in the concentration of Al.…”

Optical Properties and Upconversion Luminescence of BaTiO3 Xerogel Structures Doped with Erbium and Ytterbium

“…Low-cost coatings with upconversion photoluminescence (PL) of lanthanides are of interest for the rare side of solar cell panels as spectral converters [ 5 , 6 ]. The upconversion of erbium in barium titanate was recently studied [ 7 , 8 , 9 ]. The luminescence of trivalent erbium and other lanthanides is enhanced in microcavities and in the presence of sensitizing ions, in particular, ytterbium for erbium [ 2 ].…”

UPCONVERSION LUMINESCENCE OF Er3+ IONS FROM BARIUM TITANATE XEROGEL POWDER AND TARGET FABRICATED BY EXPLOSIVE COMPACTION METHOD

“…солнечных элементов за счет расширения спектрального диапазона чувствительности [2,3], люминесцентных изображений для защиты изделий от подделки [4]. Люминесценция ионов эрбия исследуется в материалах, различающихся шириной запрещенной зоны, энергией фононов и оптическими потерями, -оксиде алюминия, оксиде кремния [5], оксиде индия [6], алюмоиттриевых гранатах [7], монокристаллическом, аморфном и пористом кремнии [8], титанате бария [9][10][11], ниобате лития [12] и др. Ап-конверсионная люминесценция ионов эрбия в титанате бария показана в [9][10][11].…”

“…Люминесценция ионов эрбия исследуется в материалах, различающихся шириной запрещенной зоны, энергией фононов и оптическими потерями, -оксиде алюминия, оксиде кремния [5], оксиде индия [6], алюмоиттриевых гранатах [7], монокристаллическом, аморфном и пористом кремнии [8], титанате бария [9][10][11], ниобате лития [12] и др. Ап-конверсионная люминесценция ионов эрбия в титанате бария показана в [9][10][11]. Недавно нами была продемонстрирована ап-конверсионная люминесценция ионов Er 3+ в порошках титаната бария c концентрацией эрбия >3 ат.…”