Fig. 1. Structure of pc-WLED system excited by blue LD

Fig. 2. RC laser module

Fig. 3. Photos of fluorescent sheets plates pasted on different reflective substrates

Fig. 4. SEM photos of S1−S4 surface after polishing

Fig. 5. Schematic diagram of self-made test system for thermal emission characteristics

Fig. 6. Output light efficiency and color temperature curves of four fluorescent ceramic sheets with temperature variation

Fig. 7. Photo of fluorescent ceramic sheet after packaging

Fig. 8. Spectra of S1-S4 with 1 A current

Fig. 9. Light flux of four LEDs under different current

Fig. 10. The variation of light flux of S1-S4 with LD current under different LED bias current

Fig. 11. Light efficiency of LED and LD as a function of current （S3 sample）

Fig. 12. Photos of light spots cast by four samples in RC laser module