Preparies And Photoluminescence Properties Of Thenardite Activated With Transition Metol Ions Cu And Mn

In this dissertation, physical chemistry properties of thenardite from XinJiang were studied, prepared by heating thenardite activated with Cu and Mn, respectively, use thenardite as host latter,and studied luminescence properties at room temperature.Integrated results of emission spectra,excitation spectra and emission spectra at various concentration, Spectral lines of Cu⁺ and Cu²⁺ ions in Na₂SO₄:Cu are accurately assigned. The emission spectrum under 260 nm excitation consists of a broad band with a peak at 430 nm, which can be attributed to the 3d⁹4s→3d¹⁰ transition, within Cu⁺. The emission spectrum under 300 nm excitation consists of two broad bands with peaks at 430 and 550 nm, which can be attributed to the 3d⁹4s→3d¹⁰ transition within Cu⁺ and transition from the conduction band of Na₂SO₄ to the level of excited Cu²⁺(d⁹) in the Na₂SO₄ band gap, respectively. With the increase of Cu contents, not occur concentration quenching in the luminescence at 430 nm, but occur at 550 nm.The photoluminescence spectra of thenardite activated with Mn under vacuum ultraviolet excitation was obtained by using synchrotron light.The emission spectrum under 172 nm excitation consists of a broad band with a peak at 592 nm,,Which can be attributed to the T₁⁴→A₁⁶ transition within the 3d shell of Mn²⁺. The excitation spectrum obtained by monitoring the red luminescence divides into two parts: absorption bands of Mn²⁺(210 nm and 274 nm) and host absorption bands(165 nm and 233 nm). The relative emission efficiency is increased with increase of Mn contents in 0.1⁰.4 % range , occur concentration quenching at 0.3 % Mn contents.