课题组进一步对合金法和三元可控技术制得的LSN:Ce经高能辐照前后其表面微结构的变化进行了分析，图22 为两种LSN:Ce在高密度能量10 W/mm2辐照前后的表面微结构的扫描电子显微镜图（SEM）。从电镜图a）和b）可以看出，二元合金法制备的LSN:Ce经高能辐照后，表面形成了不规则的微结构，表面覆盖了一层微小颗粒，主要是高能辐照对LSN:Ce黄粉表面的烧灼过程导致材料表面熔化，出现液相，随着辐照时间增加，逐渐由液态凝聚成小球，并迅速固化后沉积于材料表面。另外，还有一个直观的现象是，LSN:Ce表面变得十分粗糙并形成了大量多孔结构，这是因为高能辐照时主要表现出热效应，LSN:Ce在吸收能量后，由于能量持续时间长和能量高，材料通过晶格振动难以将多余的热释放出来，最终在材料内部形成很多的缺陷，表面微结构形成很多孔，即二元合金法制备的LSN:Ce晶粒结晶度较差，经过高能辐照后晶粒容易受到冲击，因此导致其光谱性能更差。

The research group further analyzed the changes of surface microstructure of LSN: CE prepared by alloy method and ternary controllable technology before and after high-energy irradiation. Figure 22 shows the scanning electron microscope (SEM) of surface microstructure of two LSN: CE before and after high-density energy 10 W / mm2 irradiation. It can be seen from the electron micrographs a) and b) that after high-energy irradiation, the surface of LSN: CE prepared by binary alloy method forms an irregular microstructure, and the surface is covered with a layer of small particles. The main reason is that the burning process of LSN: CE yellow powder surface by high-energy irradiation leads to the melting of the material surface and the emergence of liquid phase. With the increase of irradiation time, it gradually condenses from liquid to small balls, And deposited on the surface of the material after rapid curing. In addition, another intuitive phenomenon is that the surface of LSN: CE becomes very rough and forms a large number of porous structures, which is because it mainly shows thermal effect during high-energy irradiation. After LSN: CE absorbs energy, due to long energy duration and high energy, it is difficult for the material to release excess heat through lattice vibration, and finally many defects are formed in the material, Many pores are formed in the surface microstructure, that is, the crystallinity of LSN: CE grains prepared by binary alloy method is poor, and the grains are vulnerable to impact after high-energy irradiation, resulting in worse spectral properties.