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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46 Handbook on the Physics and Chemistry of Rare Earths FIG. 43 Si(N,O)4 Y c 0.2634 0.2382 0.2438 0.2634 0.2781 b Crystal structure of Y2Si3O3N4. The unit of bond distance is nm. Pictures were drawn based on the structure data obtained from the database (ICSD #34583). 0.2438 0.2787 0.2781 1 0.5 0 ex. em 300 400 500 Wavelength (nm) 600 FIG. 44 Excitation and emission spectra of (Y0.98Ce0.02)2Si3O3N4. Redrawn from Lu, F.C., Chen, X.Y., Wang, M.W., Liu, Q.L., 2011. Crystal structure and photoluminescence of (Y1xCex)2Si3O3N4. J. Lumin. 131, 336–341. excitation bands at 310 and 390 nm with a shoulder at around 430 nm (Fig. 44). Upon excitation at 390 nm, a single intense and broad blue emission is observed at 485 nm. The phosphor has a relatively small Stokes shift, approximately 4200 cm1. The emission intensity at 485 nm gradually decreases with increas- ing temperature. The relative emission intensity at 150°C is 43% of that at room temperature. 4.2.3 Green-Emitting Phosphors 4.2.3.1 b-SiAlON:Eu2+ Phosphors As mentioned in Section 4.2.1.1, SiAlON materials have two different struc- tural types, a and b (Hirosaki et al., 2005; Xie and Hirosaki, 2007; Xie et al., 2010). Among them, b-type SiAlON is a solid solution of b-Si3N4 and Normalized intensity (a.u.)

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