Luminescence Properties of Thenardite Activated with Tm3+ under Vacuum Ultraviolet Excitation
The Na2SO4:Tm3+ phosphor was synthesized by the high temperature solid state reaction method in air. The crystalline structure was examined by X-ray diffraction (XRD). Narrow bands observed in emission spectra were well identified with the electronic
transitions within the 4f12
configurations of Tm3+, and the excitation spectrum is consisted of strong bands assigned to the 4f
12→4f
11
5d transition at 183 nm, the O2--Tm3+ charge transfer
band at 170 nm and weak bands assigned to host absorption (130, 223 and 258 nm). In addition, the authors also found that the content of Tm3+ in the 816 mg concentration range caused quenching.
Keywords: Na2SO4:Tm3+; Thenardite; Vacuum ultraviolet
Document Type: Research Article
Publication date: 01 February 2011
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