纳秒脉冲激光在氮气、氧气和空气等不同氛围中加工出的硅量子点都有光致荧光(PL)的发光增强效应,并且在700nm波长附近观察到了受激辐射.在不同氛围下生成的样品有几乎相同的PL光谱分布,其原因是不同氛围下加工出的样品带隙中有相同的电子态分布.计算结果显示:当硅量子点表面被氮或氧钝化后,在带隙中能够形成几乎相同的局域电子态,这种局域电子态可以俘获来自导带的电子,从而形成亚稳态,这是PL发光增强乃至产生受激辐射的关键因素. Nanosecond pulsed laser has luminescent enhancement effect of photoluminescence (PL) on silicon quantum dots fabricated in different atmospheres such as nitrogen, oxygen and air, and stimulated emission is observed at a wavelength of 700 nm. The samples have almost the same PL spectral distribution due to the same distribution of electron states in the band gap of samples processed under different atmospheres.The calculated results show that when the surface of silicon quantum dots is passivated by nitrogen or oxygen, Can form almost the same local electronic states, which can capture electrons from the conduction band to form a metastable state, which is a key factor for enhancing the PL emission and generating stimulated radiation.