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Rare Earth-Doped Phosphors for White LEDs Chapter 278 59 FIG. 54 Crystal structure of AE2Si5N8 (AE1⁄4(A) Ca and (B) Sr(Ba)). The unit of bond distance is nm. Pictures were drawn based on the structure data obtained from the database (ICSD #79070 (AE1⁄4Ca), #401500 (AE1⁄4Sr)). 4.2.4.3 SrAlSi4N7:Eu2+ Phosphors Hecht et al. (2009) first reported red-emitting SrAlSi4N7:Eu2+ phosphors. Ruan et al. (2011) investigated their luminescent properties in detail and Ruan et al. (2013) recently reported novel Ce3+-activated yellow emission phosphors based on SrAlSi4N7. In spite of the fact that the chemical formula of SrAlSi4N7 is the same as that of well-known compounds AERSi4N7 (AE1⁄4Sr and Ba, R1⁄4Yb and Y) (Fang et al., 2003; Huppertz and Schnick, 1997), it has a completely differentPDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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