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FIG. 12 Rare Earth-Doped Phosphors for White LEDs Chapter 278 21 1.5 ex. 1 0.5 0 300 em 400 500 600 Wavelength (nm) 700 Excitation and emission spectra of Sr-rich (Ba,Sr)2SiO4:Eu2+. Redrawn from Chen, L., Lin, C.C., Yeh, C.W., Liu, R.S., 2010. Light converting inorganic phosphors for white light- emitting diodes. Materials 3, 2172–2195. 100 80 60 40 20 0 50 100 150 200 Temperature (°C) 250 300 Temperature dependence of emission intensity of Sr-rich (Ba,Sr)2SiO4:Eu2+. Redrawn from Chen, L., Lin, C.C., Yeh, C.W., Liu, R.S., 2010. Light converting inorganic phosphors for white light-emitting diodes. Materials 3, 2172–2195. However, Sr-rich (Ba,Sr)2SiO4:Eu2+ have low thermal stability due to tempera- ture quenching, this being a shortcoming of orthosilicate phosphors, ie, isolated SiO4 tetrahedra, as a phosphor for white LEDs. The temperature dependence of the emission intensity of Sr-rich (Ba,Sr)2SiO4:Eu2+ is given in Fig. 13. The emission intensity measured at 150°C is only 49% of that measured at room FIG. 13 Relative intensity (%) Normalized intensity (a.u.)PDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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