Luminescence Properties Of Thenardite From Xinjiang Activated With Gd³⁺、Eu³⁺ And Preparation

In this study, we focused on preparing a new photoluminescence material using thenardite from Xinjiang Aydin Lake as the substrate of the luminescent material and studied its photoluminescence properties. The luminous intensity and colorimetric purity of the new fluorescent material, which was gained by the method called High temperature solid phase and Microwave synthesis doping an appropriate amount of rare earth activator, were dramatically improved.Luminous mineral is one of the most widely distributed mineral materials on Earth, while minerals are richly reserved in variety and amount in china. The Xinjiang Aydin Lake thenardite emits Milky light under the excitation of300nm Laser irradiation, of which the PL spectra (Photoluminescence spectra) is made up of a broad band peaked at509nm. The excitation spectra, obtained by monitoring the luminescence at530nm, consisted of a broad band with a peak located at approximately235nm and a flat band spreading over a wide range of UV and visible wavelengths. The natural thenardite exposed to (Hg253.7nm UVC or Hg356nm UVA) shows Persistence characteristic.This thesis based on study of natural thenardite preparation and luminescence properties of thenardite activated by Gd3+, Eu3+:Na2SO4:Eu,Gd、Na2Gd2(SO4)4:Eu phosphors were prepared by heating pure natural thenardite (Na2SO4) with GdF3、EuF3at1000℃for30min Muffle furnace. We studied the luminescence properties of phosphors with varying concentration of Gadolinium in sample powder, yet with the intensity of Natural thenardite and Eu in constant. It reveals that luminescence of the samples was enhanced by incorporation of Gd3+. With increasing the concentrations of Gd3+, the610nm emission intensity of Eu3+got strengthened. We presumed that Gd3+probably formed a bridge between substrate and the activator so that the energy is able to be transferred more efficiently. The luminescence intensity and chromaticity of the Eu3+reached its highest in case of mixing Gd3+,21mol%, into Thenardite (Na2SO4:Eu) crystal lattices, and Concentration quenching effect ultimately occurred.