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FIG. 30 Ba1 Ba2 SiO4 Ba3 ScO6 c ab M2 site 0.2718(8) 0.2668(6) 0.2718(8) 0.2581(7) M1 site 0.3090(7) Rare Earth-Doped Phosphors for White LEDs Chapter 278 35 0.2968(5) 0.3090(6) 0.2842(5) 0.2767(6) M3 site 0.2879(7) 0.3216(8) 0.2879(6) 0.2879(6) 0.3216(8) 0.3090(6) 0.2842(5) 0.2842(10) 0.2767(6) 0.2767(8) 0.3216(8) 0.2968(5) 0.2912(5) 0.3216(8) 0.2879(6) 0.3216(8) 0.3146(6) 0.2963(7) 0.3009(8) 0.3216(8) 0.2879(6) 0.2879(6) Crystal structure of Ba9Sc2(SiO4)6. The unit of bond distance is nm. Pictures were drawn based on the structure data obtained from the database (ICSD #75175). 0.2903, and 0.3047 nm for M1, M2, and M3, respectively. The M1 and M3 sites are located between SiO4–ScO6–SiO4 bilayers, and the M2 site is surrounded by ScO6 and SiO4. The luminescence properties of Ba9Sc2Si6O24:Eu2+ (Fig. 31) were first reported by Toda et al. (2006) and then in more details by Nakano et al. (2009). The excitation spectrum consists of three broad bands ranging from 280 to 480 nm with maxima at around 340, 380, and 440 nm. A weak absorp- tion band at 340 nm corresponds to the CT transition from the oxygen 2p orbital (usually forming the valence band) to the 5d orbital of Eu2+, and the two strong and broad bands at 380 and 440 nm belong to allowed 4f–5d tran- sitions of Eu2+. Under 440 nm excitation, Ba9Sc2Si6O24:Eu2+ exhibits a broad green emission peaking at around 510 nm. The emission intensity of the phos- phor is comparable to that of a commercial YAG:Ce3+ phosphor. At 100°C, the emission intensity is 75% of that at 25°C (Toda et al., 2006). The internal quantum efficiency under excitation at 350 nm is 47% (Bian et al. 2012). 4.1.3 Red-Emitting Phosphors 4.1.3.1 Ca2SiO4:Eu2+ Phosphors In the series of the alkaline-earth orthosilicate phosphors AE2SiO4 (AE1⁄4alka- line earth), Ca2SiO4:Eu2+ has been recently reported as a red-emitting phosphorPDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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