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64 Handbook on the Physics and Chemistry of Rare Earths 1 0.5 ex. AE = Ca AE = Sr em 0 300 400 500 600 700 800 Wavelength (nm) FIG. 60 Excitation and emission spectra of AES (AE1⁄4Ca and Sr). Redrawn from Hu, Y., Zhuang, W., Ye, H., Zhang, S., Fang, Y., Huang, X. 2005. Preparation and luminescent properties of (Ca1x,Srx)S:Eu2+ red-emitting phosphor for white LED. J. Lumin. 111, 139–145. 4.3.2 Sr8Al12O24S2:Eu2+ Phosphors The crystal structures of the alkaline-earth oxysulfide compounds AE8Al12O24S2 (AE1⁄4Ca and Sr) have been determined (Brenchley and Weller, 1992). Fig. 61 shows the structure of Sr8Al12O24S2 which is cubic with space group I43m and a 1⁄4 0.9257 nm. Sr8Al12O24S2:Eu2+ exhibits a broad excitation band from 400 to 500 nm with a maximum at 450 nm and, under excitation at 450 nm, it exhibits a broad reddish–yellow emission with a maximum at 605 nm (Kuo et al., 2010a,b) (Fig. 62). The broad excitation band well matches with the emission spectral range of a blue-LED chip. The emission intensity measured at 150°C is approx- imately 70% of that at 25°C. The emission intensity of Sr8Al12O24S2:Eu2+ is successfully enhanced by Er3+ codoping (Dong et al., 2012). 4.3.3 AEGa2S4:Eu2+ (AE1⁄4Alkaline Earth) Phosphors Rare earth-doped alkaline-earth thiogallates, AEGa2S4, have been investigated extensively and used as a green phosphors in field emission displays (FEDs) and thin-film electroluminescent (TFEL) devices from a long time (Bayramov et al., 2003; Ko et al., 2008; Peters and Baglio, 1972; Souriau et al., 2000). Recently, Eu2+-activated AEGa2S4 are considered to be the most promising can- didates for white LEDs as green or yellow phosphors (Huh et al., 2003; Jiang et al., 2000; Joos et al., 2012; Kim et al., 2005d, 2015a; Zhang et al., 2007b). The crystal structure of AEGa2S4 is orthorhombic with space group Fddd (Peters and Baglio, 1972). On the other hand, BaGa2S4 has a crystal structure Relative intensity (a.u.)PDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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