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48 Handbook on the Physics and Chemistry of Rare Earths 1 0.5 0 200 ex. em 300 400 500 Wavelength (nm) 600 700 Excitation and emission spectra of b-SiAlON:Eu2+. Redrawn from Xie, R.J., Hirosaki, N., Kimura, N., Sakuma, K., Mitomo, M., 2007. 2-Phosphor-converted white light-emitting diodes using oxynitride/nitride phosphors. Appl. Phys. Lett. 90, 1101–1103. Television System Committee (NTSC), which is higher than that of the white LED for a back-light unit using Ba-rich (Ba,Sr)2SiO4:Eu2+ (96% of NTSC). 4.2.3.2 AESi2O2N2:Eu2+ (AE5Ca, Sr, and Ba) Phosphors AESi2O2N2:Eu2+ (AE1⁄4Ca, Sr, and Ba) have been considered to be among the most promising candidates for green-emitting phosphors for white LEDs. Li et al. (2005) reported the luminescence properties and the crystal struc- ture of the AESi2O2N2:Eu2+ (AE 1⁄4 Ca, Sr, and Ba) phosphors synthesized by a conventional solid-state reaction with a AECO3 (AE1⁄4Ca, Sr, and Ba)– Eu2O3–SiO2–Si3N4 system. Thereafter, Schnick’s group (Kechele et al., 2009a) investigated the crystal structure of AESi2O2N2 (AE1⁄4Ca, Sr, and Ba) in detail and they derived the different crystal structures from that reported by Li et al. (2005). Regarding the crystal structures of AESi2O2N2 (AE1⁄4Ca, Sr, and Ba), there are some contradictions in the literature, probably due to differences in the estimation of order/disorder between oxygen and nitrogen sites and the existence of impurity phases (mainly Si3N4) (Kechele et al., 2009a,b). On the basis of the most reliable crystallographic data reported, the structural features could be summarized as follows: CaSi2O2N2 has a monoclinic structure with space group P21 (H€oppe et al., 2004), SrSi2O2N2 has a triclinic structure with space group P1 (Oeckler et al., 2007), and BaSi2O2N2 has an orthorhombic structure with space group Pbcn (Kechele et al., 2009a,b). The crystallographic data of AESi2O2N2 (AE1⁄4Ca, Sr, and Ba) are summarized in Table 3, and the crystal structures are shown in Fig. 47. FIG. 46 Normalize intensity (a.u.)PDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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