Emission Mechanisms of Si Nanocrystals and Defects in SiO₂ Materials

Figure 17

Paramagnetic point defects in SiO₂. (a) The center [54–56], (b) twofold coordinated silicon [53], (c) nonbridging oxygen hole center (NBOHC) [55], (d) the neutral oxygen vacancy, and (e) peroxy radical [53, 56]. All of these are well-known centers related to the emission of light in quartz [57].

(a)

(b)

(c)

(d)

(e)