Fig. 1. Flow char of coating process

Fig. 2. Particle distributions of YAG∶Ce3+ phosphor powder

Fig. 3. SEM images of YAG∶Ce3+ phosphor powder. (a) Original particles; (b) particles after ball milling; (c) particles after coating

Fig. 4. UV-Vis absorption spectra of coated YAG∶Ce3+ phosphor powder

Fig. 5. Coating model of YAG∶Ce3+ phosphor powder particle

Fig. 6. Light illumination on spherical receiving surfaces of YAG∶Ce3+ phosphor powder particles before and after coating. (a) After TEOS coating; (b) before TEOS coating

Fig. 7. Light mapping of YAG∶Ce3+ ceramics excited by 460 nm blue light. (a) Non-excited state; (b) excited state

Fig. 8. Emission spectra

Fig. 9. Relative densities of YAG∶Ce3+ ceramics with different amounts of TEOS after inserting at 1475-1625 ℃ for 5 h

Fig. 10. Micro-morphologies of YAG ceramics after inserting at 1575 ℃ for 5 h. (a) Before coated with 2% TEOS; (b) after coated with 2% TEOS

Fig. 11. Relative densities of YAG ceramics sintered at 1400-1500 ℃ under different doping conditions

Fig. 12. Micro-morphologies of YAG ceramics sintered at different temperatures and and at different doping. (a) Cuo-TiO2 doped, 1450 ℃; (b) CuO doped, 1475 ℃

Fig. 13. Rockwell hardness of samples after sintering at different temperatures for 5 h

Fig. 14. Fracture toughness of samples after sintering at different temperatures for 5 h

Fig. 15. Rockwell hardness and fracture toughness of YAG ceramics doped with 2% CuO

Fig. 16. Rockwell hardness and fracture toughness of YAG ceramic doped with 2% CuO-TiO2