Size-Dependent Optical Properties of Nanoscale and Bulk Long Persistent Phosphor SrAl2O4:Eu2+, Dy3+. (13th August 2015)

• Record Type: Journal Article
• Authors: Duan, Xiaoxia; Yi, Lixin; Zhang, Xiqing; Huang, Shihua
• Other Names: Zhu Yong Academic Editor.
• Is Part Of: Journal of nanomaterials. Volume 2015(2015)
• Publication Date: 2015-08-13
• Subjects: Nanostructured materials -- Periodicals; Nanotechnology -- Periodicals; Nanomatériaux; Nanostructured materials; Nanotechnology; Nanostructures; Nanotechnology; Periodicals; Fulltext; Internet Resources; Periodicals; 620.115
• DOI: 10.1155/2015/298692
• Languages: English
• ISSNs: 1687-4110

Abstract

Abstract : Nanoscale long persistent phosphor SrAl2 O4 :Eu 2+, Dy 3+ was prepared by autocombustion of citrate gel. The energy level shift of activator Eu 2+ and coactivator Dy 3+ was analyzed according to the emission and the excitation spectra. The band gap change of SrAl2 O4 and the resulting trap depth change with particle size were discussed on the basis of analyzing the visible spectra, the vacuum ultraviolet (VUV) excitation spectra, and the thermoluminescence (TL) spectra. The fluorescence quenching and the shallow traps originating from surface adsorption or surface defects explain the weak initial persistent phosphorescence and the fast phosphorescence decay in nanometer SrAl2 O4 :Eu 2+, Dy 3+ . It is confirmed that energy level, band gap, trap depth, defect, and surface adsorption are deeply related with each other in this nanoscale long persistent phosphor.