Surfactant-assisted Solvothermal/hydrothermal Synthesis And Characterization Of SrCO₃:TB³⁺ Phosphors

As is well known to us, strontium carbonate （SrCO₃） is a kind of the mostimportant inorganic chemical materials which have been extensively utilized in multipleareas or industries. At present, many researchers have been devoted to developing thismaterial using variety methods for its special properties. However, there have been fewstudies on discussing the morphologies and properties of rare earth doped SrCO₃phosphors by surfactant-assisted methods. Herein, we introduced strontium acetatehemihydrate as Sr2+ions source, the rare earth oxide Tb4O7dissolved in diluted HNO3solution to obtain Tb³⁺ions and urea decomposed in distilled water to provide CO32-ions. Along with introducing different surfactants to synthetize SrCO₃particles withspecial morphologies and spectrum properties by solvothermal/hydrothermal methods.The flower-like SrCO₃:Tb³⁺phosphors were prepared by PVP-assistedsolvothermal （ethylene glycol and methanol） method. According to the results of X-raydiffraction （XRD）, fourier transform infrared spectroscopy （FT-IR） and field emissionscanning electron microscopy （FE-SEM）, the possible anisotropic formation mechanismfor the microstructures is proposed. Besides, the obtained SrCO₃:Tb³⁺particles show thecharacteristic dominant emission lines of Tb³⁺5D4–7F5at544nm under233nmultraviolet excitation.Well-dispersed SrCO₃:Tb³⁺hollow microspheres have been synthesized in thewater-ethanol-ethylene glycol solvent system using oleic acid （OA） as surfactant. X-raydiffraction （XRD）, fourier transform infrared spectroscopy （FT-IR）, and field emissionscanning electron microscopy （FESEM）, as well as photoluminescence spectroscopy（PL） were used to characterize the resulting samples. The SrCO₃:Tb³⁺phosphors showstrong photoluminescence with green emission5D4–7F5（544nm） as the most prominentgroup under ultraviolet excitation. The dosage of OA and the reaction time play keyroles in the formation of the final samples and the feasible growth mechanism alsohas discussed in the text.The hexagonal prism-like SrCO₃:Tb³⁺microstructures have been successfullysynthesized by a facile hydrothermal method in the presence of sodium dodecyl sulfate （SDS） as anionic surfactant. The SrCO₃:Tb³⁺particles with different shapes and spectralintensity have been detected via XRD, FT-IR, FESEM and PL, which obtained bychanging the concentration of sodium dodecyl sulfate and the response time. Underultraviolet excitation, the SrCO₃:Tb³⁺phosphors show strong green emission whichbelongs to Tb³⁺5D4–7F5transition at544nm.