X-ray absorption near-edge spectroscopy study of photoluminescent Ca2.955Sc2−xAlxSi3O12:Ce3+ green phosphors. Issue 3 (April 2015)

• Record Type: Journal Article
• Authors: Wu, Yun-Fang; Chiou, Jau-Wern; Nien, Yung-Tang; Yeh, Chen-Lin; Chen, In-Gann; Lee, Jyh-Fu
• Is Part Of: Ceramics international. Volume 41:Issue 3(2015)Part B
• Page Start: 4538
• Page End: 4543
• Publication Date: 2015-04
• Subjects: Ca3Sc2Si3O12 -- Cerium -- Garnet -- Phosphor -- X-ray absorption spectroscopy; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2014.11.149
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Al 3+ co-doped Ca2.955 Sc2 Si3 O12 :Ce 3+ green phosphors were systematically investigated using X-ray absorption near-edge spectroscopy (XANES) to understand the influence of Al 3+ incorporation on photoluminescence behavior. XANES analysis was used to confirm the doping site of Al atoms in the Ca2.955 Sc2 Si3 O12 :Ce 3+ host, the valence state of Ce atoms, the symmetry around Ca and Ce atoms, and the bonding modes of oxygen atoms with cation atoms in the as-prepared Ca2.955 Sc2− x Al x Si3 O12 :Ce 3+ (CSAS:Ce). XANES results indicate that Al 3+ occupies the Sc 3+ sites and stabilizes the crystal structure of the host material. Furthermore, Al 3+ can effectively inhibit the oxidization of Ce 3+ to Ce 4+, which enhances the photoluminescence of CSAS:Ce green phosphors.