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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62 Handbook on the Physics and Chemistry of Rare Earths TABLE 8 Structure Data of SrAlSi4N7 (Hecht et al., 2009) Crystal System Orthorhombic Space group Pna21 a (nm) 1.1742(2) b (nm) 2.1391(4) c (nm) 0.4966(1) V (nm3) 1.24733 Z8 ex. 1 em 0.5 0 300 400 500 600 700 800 Wavelength (nm) Excitation and emission spectra of Sr0.97Eu0.03AlSi4N7. Redrawn from Ruan, J., Xie, R.J., Hirosaki, N., Takeda, T., 2011. Nitrogen gas pressure synthesis and photoluminescent properties of orange-red SrAlSi4N7:Eu2+ phosphors for white light-emitting diodes. J. Am. Ceram. Soc. 94, 536–542. composed of SiN4 and AlN4 tetrahedra, linked by corners- and edge sharing each other, to form a highly condensed 3D network. In addition, infinite chains built only by AlN4 tetrahedra edge sharing themselves are formed in parallel to the c-axis. The Sr2+ ions occupy the two independent sites and form SrN6 octahedra and SrN8 dodecahedra. The Sr–N bond distance in the SrN6 octahedra varies from 0.2504 to 0.3143 nm, and that in the SrN8 dode- cahedra varies from 0.2653 to 0.3057 nm. Fig. 59 shows the excitation and emission spectra of Sr0.97Eu0.03AlSi4N7, which exhibits the highest emission intensity under excitation at 450 nm FIG. 59 Normalize intensity (a.u.)

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