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22 Handbook on the Physics and Chemistry of Rare Earths temperature. In addition, it is necessary to improve the chemical stability of alkaline-earth orthosilicate phosphors since they are not so stable toward water. Further improvements are therefore necessary for these phosphors to be consid- ered for practical applications. 4.1.1.3 Sr3SiO5:Eu2+ Phosphors In addition to alkaline-earth orthosilicate phosphors, AE2SiO4:Eu2+ (AE1⁄4Ca, Sr, and Ba), alkaline-earth silicate phosphors have been widely investigated and used in white LEDs owing to their excellent chemical and thermal stabil- ity, high luminescence efficiency, and low cost. Among them, Sr3SiO5:Eu2+ is attracting attention as a promising candidate to replace the commercial yellow-emitting YAG:Ce3+ and Sr-rich (Ba,Sr)2SiO4:Eu2+ phosphors (Chen et al., 2013; Jang et al., 2009a,b; Jee et al., 2006; Kang et al., 2011; Park et al., 2004, 2006; Shao et al., 2015; Sun et al., 2008; Wang et al., 2012a; Yang et al., 2014a). AE3SiO5 has a similar composition to that of alkaline-earth orthosilicates; however, the crystal structure of AE3SiO5, which was first reported by Glasser and Glasser (1965), has unique features different from those of AE2SiO4. Except for Ba3SiO5 (space group I4/mcm), CS3SiO5 (CS1⁄4Ca and Sr) with space group P4/ncc are built of CSO6 octahedra and isolated SiO4 tetrahedra, as shown in Fig. 14. One should pay attention to the existence of O2 ions that do not bond to Si but are the ligands for CS. This fact may contribute to the high performance of the phosphors although FIG. 14 SiO4 Sr1 O c Sr2 Sr1 site 0.2543 0.2564 0.2564 0.2543 Sr2 site a b 0.2562 0.2562 0.2680 0.2562 0.2562 0.2680 Crystal structure of Sr3SiO5. The unit of bond distance is nm. Pictures were drawn based on the structure data obtained from the database (ICSD #18151). 0.2570 0.2570PDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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