大功率LEDs用YMASG∶Ce橙光陶瓷的制备与应用

Preparation and application of YMASG:Ce orange ceramics for high-power LEDs

为了提高传统发光二极管(LEDs)的热稳定性和解决红光成分缺失的问题,基于超细粉体原料反应烧结制备了Y3-x Mg2 AlSi2 O12:xCe^3+(YMASG:Ce)荧光陶瓷.采用XRD、SEM、PL等测试方法研究了其组成、微结构和发光性能.结果表明:1520℃是YMASG:Ce陶瓷的最佳烧结温度,含第二相MgY4 Si3 O13仍呈致密化结构.在460 nm蓝光激发下,YMASG:Ce陶瓷发光波长为582~600 nm,与蓝光芯片封装后LEDs发出利于人眼健康的低色温光;当掺Ce^3+量x=0.005时,LEDs的色温为2398 K,显色指数为77.6,光效为37.3 lm/W,发光性能优异.与荧光粉相比,YMASG:Ce橙光陶瓷具有高热稳定性,在大功率LEDs照明上有广阔应用前景.

In order to improve the thermal stability of traditional light-emitting diode(LEDs)and solve the problem of deficiency of red spectral component,the Y3-x Mg2 AlSi2O12∶xCe^3+(YMASG∶Ce)transparent ceramics were prepared from superfine powder raw materials by solid-state reaction sintering method.The composition,microstructure and luminescence properties were characterized by XRD,SEM,PL,etc.The results indicate that the optimal sintering temperature is 1520℃,which is lower than previous reports.The YMASG∶Ce ceramics has the secondary phase MgY4 Si3O13 and still high-density structure.Under the excitation of 460 nm blue light,the emission of YMASG∶Ce ceramics ranges from 582 nm to 600 nm.After assembled with LED blue chip,the ceramic-packaged LEDs display the lighting with the color temperature of 2398 K,color rendering index of 77.6 and luminous efficiency of 37.3 lm/W when the doping concentration of Ce^3+is x=0.005.Taking into account inherent high thermal stability,the YMASG∶Ce orange ceramic has broad application prospects in high power and low color temperature LEDs.