该文报道氧气、氮气或空气等不同氛围中用纳秒脉冲激光在硅基上加工生成量子点结构,发现这些样品在700 nm波长附近均有增强的光致发光(Photoluminescence,PL),且各样品的PL峰很相似;经适当退火处理后,在某些样品上观察到随机受激发光.通过第一性原理计算,发现各种量子点结构表面的成键类型与密度是形成PL发光增强的关键,并由此提出相应的物理模型. In this paper, we report that quantum dots are processed by nanosecond pulsed laser on Si substrate in different atmospheres such as oxygen, nitrogen or air. These samples have enhanced photoluminescence (PL) at around 700 nm, and each The PL peaks of the samples are very similar, and after appropriate annealing, randomly stimulated luminescence is observed on some samples.First-principles calculations show that the type and density of the bonding on the surfaces of various quantum dot structures are the result of PL luminescence enhancement The key, and thus put forward the corresponding physical model.