Original Synthetic Route To Obtain a SrAl2O4 Phosphor by the Molten Salt Method: Insights into the Reaction Mechanism and Enhancement of the Persistent Luminescence

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• 作者：Roc铆o Estefan铆a Rojas-Hernandez ; Fernando Rubio-Marcos ; Ricardo Henrique Gon莽alves ; Miguel 脕ngel Rodriguez ; Emmanuel V茅ron ; Mathieu Allix ; Catherine Bessada ; Jos茅 Francisco Fernandez
• 刊名：Inorganic Chemistry
• 出版年：2015
• 出版时间：October 19, 2015
• 年：2015
• 卷：54
• 期：20
• 页码：9896-9907
• 全文大小：752K
• ISSN：1520-510X

文摘

SrAl₂O₄:Eu²⁺, Dy³⁺ has been extensively studied for industrial applications in the luminescent materials field, because of its excellent persistent luminescence properties and chemical stability. Traditionally, this strontium aluminate material is synthesized in bulk form and/or fine powder by the classic solid-state method. Here, we report an original synthetic route, a molten salt assisted process, to obtain highly crystalline SrAl₂O₄ powder with nanometer-scale crystals. The main advantages of salt addition are the increase of the reaction rate and the significant reduction of the synthesis temperature because of much higher mobility of reactants in the liquid medium than in the solid-state method. In particular, the formation mechanism of SrAl₂O₄, the role of the salt, and the phase鈥檚 evolution have been explored as a function of temperature and time. Phosphorescent powders based on SrAl₂O₄:Eu²⁺, Dy³⁺ with high crystallinity are obtained after 1 h treatment at 900 掳C. This work could promote further interest in adopting the molten salt strategy to process high-crystallinity materials with enhanced luminescence to design technologically relevant phosphors.