HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS

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HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS ( handbook-onphysics-and-chemistry-rare-earths )

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Rare Earth-Doped Phosphors for White LEDs Chapter 278 37 TABLE 2 Structure Data of Polymorphs of Ca2SiO4 Space Multiplicity Crystal System Group of Ca Sites References g-Ca2SiO4 Orthorhombic Pbnm 2 della Giusta et al. (1990) b-Ca2SiO4 Monoclinic P21/n 2 Toraya and Yamazaki (2002) a0 L-Ca2SiO4 Orthorhombic Pna21 6 Mumme et al. (1996) a0H-Ca2SiO4 Orthorhombic Pnma 2 Mumme et al. (1995) a-Ca2SiO4 Hexagonal P3m 3 Eysel and Hahn (1970) 1 0.5 0 300 ex. em x = 0.2 x = 0.8 400 500 600 Wavelength (nm) 700 800 Excitation and emission spectra of a0 L-(Ca1xEux)2SiO4 from Sato, Y., Kato, H., Kobayashi, M., Masaki, T., Yoon, D. H., Kakihana, M., 2014. Tailoring of deep-red luminescence in Ca2SiO4:Eu2+. Angew. Chem. Int. Ed. 53, 7756–7759. AE sites with different coordination numbers. For instance for AE1⁄4Ca, there is a Ca1 site with AEO10 and a Ca2 site with AEO9. In this case, the Eu2+ ions preferentially occupy initially the Ca1 sites, and begin to occupy the Ca2 sites when the Eu2+ concentration exceeds a critical value, consequently, resulting in shifting the emission band to longer wavelength. The method of customiz- ing the luminescence color by controlling the site selection of the emitting ion is known as crystal-site engineering approach (Noguchi et al., 1996). FIG. 32 (x 1⁄4 0.2 and 0.8). Redrawn Normalized intensity (a. u.)

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