Fig. 1. Picosecond laser treatment of ceramic surfaces

Fig. 2. XRD patterns of (Ce,Gd)∶YAG-Al₂O₃ ceramic phosphor

Fig. 3. Photomicrographs of samples after ablation. (a) C0; (b) C1; (c) C2; (d) C3; (e) C5; (f) ablation diameters in X and Y directions with different numbers of ablations

Fig. 4. Roughness profile of ceramic surface after laser ablation. (a) C0; (b) C1; (c) C3; (d) C5; (e) ablation depths at different numbers of ablation

Fig. 5. Surface morphology analysis of fluorescent ceramics before and after laser processing. (a) SEM morphology of fluorescent ceramic surface after laser ablation; (b) unablated area; (c) ablation area; (d) schematic of localized ablation of fluorescent ceramic surface irradiated by picosecond laser

Fig. 6. Luminescence characteristics of fluorescent ceramics before and after laser processing. (a) Electroluminescence spectrum of phosphors ceramics converted WLEDs after laser ablation; (b) schematics of blue light excitation phosphor ceramics

Fig. 7. LE and CCT of phosphors ceramics converted WLEDs after laser ablation

Fig. 8. Luminescence properties of fluorescent ceramics after double sided laser processing. (a) Schematics of blue light excitation the phosphor ceramics; (b) electroluminescence spectrum of phosphors ceramics converted WLEDs with different treatments

Fig. 9. Chromaticity coordinate of phosphors ceramics converted WLEDs