Fabrication and Performance Optimization of MgO-La3 Si6 N11∶Ce3+Composite Phosphor-in-glass for Laser Lighting
Phosphor-in-glass(PiG)materials have great potential in the field of laser lighting.However,the low thermal conductivity of the glass matrix leads to serious thermal quenching issues under working conditions,thus re-ducing the luminous performance.To improve the heat dissipation performance of PiG,high thermal conductivity MgO particles have been introduced into La3Si6N11∶Ce3+(LSN∶Ce3+)nitride PiG to create MgO-LSN∶Ce3+composite PiG.By optimizing the fabrication process,MgO content,and glass thickness,the composite PiG with the best com-prehensive performance achieved a luminescent saturation threshold of 2.08 W/mm2 under laser excitation,which is 38.7%higher than the MgO-free PiG sample(1.5 W/mm2).The maximum luminous flux also increased by 44.6%,from 383 lm to 554 lm.Furthermore,due to the improved scattering performance,the luminous uniformity of MgO-LSN∶Ce3+composite PiG was significantly optimized.Finally,by further introducing red-emitting CaAlSiN3∶Eu2+(CASN∶Eu2+)phosphors into the composite PiG and adjusting the ratio between LSN∶Ce3+and CASN∶Eu2+,a high-quality laser-driven white light source with a color rendering index(Ra)of 85.5 can be achieved.
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