Fig. 1. XRD patterns of CaY1-x-yAlO4∶xCe3+,yTb3+

Fig. 2. TEM images of CaY0.99AlO4∶0.01Ce3+

Fig. 3. (a) Excitation and emission spectra of CaY0.99AlO4∶0.01Ce3+; (b) emission spectra of CaY1-xAlO4∶xCe3+; (c) CIE chromatic coordinates of CaY1-xAlO4∶xCe3+

Fig. 4. (a) Excitation and emission spectra of CaY0.98AlO4∶0.02Tb3+; (b) emission spectra of CaY1-yAlO4∶yTb3+(inset shows relationship between Tb3+ concentration and Tb3+ emission intensity); (c) CIE chromatic coordinates of CaY1-yAlO4∶yTb3+

Fig. 5. (a) Excitation and emission spectra of CaY1-x-yAlO4∶xCe3+,yTb3+; (b) CIE chromatic coordinates of CaY1-x-yAlO4∶xCe3+,yTb3+ under different excitation wavelengths

Fig. 6. Excitation and emission spectra of CaY0.99-xAlO4∶xCe3+,0.01Tb3+. (a) Excitation spectra, λem=445 nm; (b) excitation spectra, λem=548 nm; (c) emission spectra, λex=246 nm; (d) emission spectra, λex=378 nm

Fig. 7. Excitation and emission spectra and CIE chromatic coordinates of CaY0.99-yAlO4∶0.01Ce3+,yTb3+. (a) Excitation spectra, λem=445 nm; (b) excitation spectra, λem=548 nm; (c) emission spectra, λex=246 nm; (d) emission spectra, λex=305 nm; (e) emission spectra, λex=368 nm; (f) CIE chromatic coordinates

Fig. 8. (a) Luminescence decay curves of Ce3+ and (b) relationship between Ce3+ energy transfer efficiency and Tb3+ concentration in CaY0.99-yAlO4∶0.01Ce3+, yTb3+

Fig. 9. Simplified energy level diagram of Ce3+ and Tb3+ and possible energy transfer from Ce3+ to Tb3+ ions[12]