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60 Handbook on the Physics and Chemistry of Rare Earths AE = Ca AE = Sr AE = Ba FIG. 56 1 0.5 0 500 600 700 800 Wavelength (nm) Emission spectra of AE1.98Eu0.02Si5N8 (AE1⁄4Ca, Sr, and Ba). The unit of bond distance is nm. Redrawn from Li, Y.Q., van Steen, J.E.J., van Krevel, J.W.H., Botty, G., Delsing, A.C.A., DiSalvo, F.J., de With, G., Hintzen, H.T. 2006. Luminescence properties of red-emitting M2Si5N8:Eu2+ (M1⁄4Ca, Sr, Ba) LED conversion phosphors. J. Alloys Compd. 417, 273–279. FIG. 55 crystal structure. The structure of SrAlSi4N7 is shown in Fig. 58, and the crystallographic data are summarized in Table 8. SrAlSi4N7 has an ortho- rhombic structure with space group of Pna21, a1⁄41.1742 nm, b1⁄42.1391 nm, c 1⁄4 0.4966 nm, and V 1⁄4 1.2472 nm3 (Hecht et al., 2009). The structure is ex. 1 0.5 0 200 300 Excitation and emission spectra of (Sr0.98Eu0.02)2Si5N8. Data were collected from a phosphor synthesized by the authors. 400 500 Wavelength (nm) em 600 700 800 Normalize intensity (a.u.) Normarized intensity (a.u.)PDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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