Electron - hole pairs are created by photo - excitation in the nanoscale silicon units , and then recombined radiatively in the thin oxide layers , giving a green or red pl through the luminescence centers outside the nanoscale 不掺sb的szoz与ax层中的发光中心发射的光子能量为2 zcv ,掺sb的sfloz与引x层中的发光中心发射的光子能量为1