Fig. 1. XRD patterns of different samples. (a) Sr3(1-x)P4O13∶3xCe3+(x=0.02,0.04,0.06,0.08,0.10); (b) Sr3(0.92-y)P4O13∶0.24Ce3+,3yTb3+(y=0,0.01,0.03,0.05,0.07,0.09)

Fig. 2. Refined XRD of Sr3P4O13

Fig. 3. Morphology analysis of Sr3P4O13. (a) EDS; (b) SEM image; (c) TEM image; (d) crystal lattice stripe; (e) electron diffraction pattern

Fig. 4. PL and PLE spectra of samples. (a) PLE spectra of Sr2.76P4O13∶0.24Ce3+ and PL spectra of Sr3(1-x)P4O13∶3xCe3+(x=0.02,0.04,0.06,0.08,0.10); (b) PL spectrum of Sr3P4O13∶Ce3+ and PLE spectrum of Sr3P4O13∶Tb3+; (c) PL and PLE spectra of Sr2.61P4O13∶0.24Ce3+, 0.15Tb3+

Fig. 5. Relationship between PL spectra and doping mole fraction y of sample. (a) PL spectra of Sr3(0.92-y)P4O13∶0.24Ce3+,3yTb3+(y=0,0.01,0.03,0.05,0.07,0.09) samples. (b) influences of emission intensities of Ce3+ and Tb3+ on Tb3+ mole fraction y

Fig. 6. Color coordinate of Sr2.61P4O13∶0.24Ce3+,0.15Tb3+

Fig. 7. Decay curves and energy transfer efficiency of Sr3(0.92-y)P4O13∶0.24Ce3+,3yTb3+ (y=0,0.01,0.03,0.05,0.07,0.09) phosphors. (a) Decay curves of Ce3+ demonstrated on a logarithmic intensity scale; (b) relationship among fluorescence decay lifetime of Ce3+, energy transfer efficiency of Ce3+, and doping mole fraction of Tb3+

Fig. 8. Relationship between IS0/IS of Ce3+ and C. (a) n=3; (b) n=6; (c) n=8; (d) n=10

Fig. 9. Emission spectra of Sr2.61P4O13∶0.24Ce3+,0.15Tb3+ at different temperatures when λex=290 nm (inset shows emission intensities under different temperatures)