Study On Combined Sintering Of YAG:Ce³⁺/Glass And Optical Properties

White LED is a green,efficient and energy-saving light source.The researches of YAG:Ce3+ phosphors which are used in white LED and its sealing way have great significance.In this paper,YAG:Ce3+ phosphors were prepared by solid phase method and YAG glass was prepared by traditional melt cooling method.And next YAG:Ce3+ ceramics were prepared by vacuum(vacuum degree:1.0×10-3 Pa)sintering with YAG:Ce3+ powders as basic material and YAG glass as sintering aid.A orthogonal experiment which included three factors and three levels was designed to determine the effects of sintering aids content(here and below are mass fraction),sintering temperature and sintering holding time on YAG:Ce3+ceramics sintering.The structure,morphology and luminescence properties of YAG:Ca3+ceramics were systematic studied by XRD,SEM and luminescence spectrum.And then,ceramics were prepared by vacuum sintering with YAG glass as basic material and YAG:Ce3+powders as sintering aid.The effects of sintering aids content,sintering temperature and sintering holding time on ceramics sintering were also studied by orthogonal experiment analysis.The results indicate that:1.The main crystal phase of YAG:Ce3+ phosphors prepared by solid phase method and crystallized YAG glass prepared by melt cooling method are both YAG2.The main crystal phase of ceramics is YAG Excitation spectrum of the visible region peaks between 440 nm to 460 nm,there is a broadening phenomenon,the emission peak at 550 nm,both of them are in line with the fluorescence characteristics of YAG:Ce3+.3.The greatest impact on the shrinkage and the luminescence intensity of ceramics whose basic material is YAG:Ce3+ powders is sintering aids content,while holding time has a minimal impact.The optimum combination for shrinkage were as follows:content of sintering aid 30%,sintering temperature 1500 ℃,holding time 4h,which for luminescence intensity were:content of sintering aid 20%,sintering temperature 1500 ℃,holding time 4 h.4.The main crystal phase of ceramics whose basic material is YAG glass is still YAG,and excitation spectra which peak at about 457 nm and emission spectra which peak between 530 nm to 540 nm are also in line with the luminescence properties of YAG:Ce3+,but the strength is lower than the ceramics based on YAG:Ce3+ powders.5.In the second orthogonal experiment,the greatest impact on shrinkage and the luminescence intensity of ceramics is sintering aids content,followed by the sintering holding time and the sintering temperature.But with the changes of factors and levels,shrinkage changes a little.The optimum combination for shrinkage were as follows:content of sintering aid 10%,sintering temperature 1100 ℃,holding time 1 h,which for luminescence intensity were:content of sintering aid 30%,sintering temperature 1000 ℃,holding time 4 h.