Emission Mechanisms of Si Nanocrystals and Defects in SiO2 Materials
Figure 16
Energy interactions allowed in a point defect. Absorption of a photon (solid arrow) from the ground state to a single S1 produces an electron that rapidly relaxes by internal conversion to a lower vibrational energy (horizontal arrow). Next, it can decay to the S0 singlet emitting a photon (dotted arrow) or it can relax to the triplet T1. It is also possible that the decay to the ground state does not produce an emission.
