Author Affiliations
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 210016, Chinashow less
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
Material | Size | Physical parameter |
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YAG∶Ce3+ phosphor powder particles | Radius: 1.5 μm | n=2.1, α=0.82 mm-1 | TEOS coating-layer | Inner radius: 1.5 μmExternal radius: 1.6 μm | n=1.6, α=0 mm-1 | Light source | 0.5 μm×0.5 μm×0.5 μm | Power: 1 W, wavelength: 200 nm | Spherical receiver | Inner radius: 3.6 μmExternal radius: 4.0 μm | Inner surface: perfect absorption |
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Table 1. Model size parameters and physical properties of TEOS-coated YAG∶Ce3+ phosphor powder particles[29-32]
Treatmentmode | Particle sized(0.5) /μm | Sinteringtemperate T /℃ | Linearshrinkage Ls /% | Densityρ /(g·cm-3) | Relativedensity /% |
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Original particles | 22.305 | 1650 | 12.3% | 4.13 | 91.7 | Ball milling 24 h | 15.604 | 1650 | 13.7% | 4.21 | 93.5 | Grinding 2 h+ball milling 24 h | 3.182 | 1625 | 14.6% | 4.31 | 94.8 |
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Table 2. Particle size and sintering properties of powder