Effects of Ln3+ (Ln=Ce, Pr, Tb and Lu) doping on the persistent luminescence properties BaMg2(PO4)2:Eu2+ phosphor. Issue 10 (December 2015)

• Record Type: Journal Article
• Authors: Ju, Guifang; Hu, Yihua; Chen, Li; Yang, Zhongfu; Wang, Tao; Jin, Yahong; Zhang, Shaoan
• Is Part Of: Ceramics international. Volume 41:Issue 10(2015)Part B
• Page Start: 14998
• Page End: 15004
• Publication Date: 2015-12
• Subjects: Persistent luminescence -- Codopant -- Phosphor -- Phosphate; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2015.08.047
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The photoluminescent and persistent luminescence properties of BaMg2 (PO4 )2 :Eu 2+, Ln 3+ (Ln=Ce, Pr, Tb and Lu) were investigated. These phosphors were prepared by a solid-state reaction at high temperature. The persistent phosphors were investigated by XRD, photoluminescence, persistent luminescence and thermoluminescence glow curves. Radiative/nonradiative energy transfer from Eu 2+ to Pr 3+ /Tb 3+ were observed due to the overlap between the Eu 2+ emission and Pr 3+ /Tb 3+ absorption spectra. The relevant transitions of Pr 3+ and Tb 3+ are respectively spin allowed and forbidden, so that the energy transfer occurs in different manners. After irradiated by ultraviolet light, all these codoped phosphors show a broad-band persistent luminescence located at ~435 nm at room temperature. Codoping with Tb 3+ considerably enhances the afterglow intensity while Pr 3+ codoped sample only shows weak afterglow. These properties can also be confirmed by their thermoluminescence glow curves. The emissions for both photoluminescence and persistent luminescence are due to the 5d→4f transition of Eu 2+ . The influence of auxiliary codopants is discussed in terms of ionization energy and ionic radius.