Violet luminescence of zinc oxide single crystals

Structural, spectroscopic and electrical studies of nanostructured porous ZnO thin films prepared by pulsed laser deposition

“…The violet emission may be due to the radiative transitions between the interface trap levels and the valance band where the interface traps exists at the grain boundaries [39]. The origin of blue emission in the ZnO films can be due to the transition between the levels of interstitial zinc to the valance band or may be due to the impurities and defect structures such as oxygen vacancies and zinc interstitials [41,42].…”

Role of excitons in the excitation of deep‐level emission in ZnO crystals

“…On the other hand, the density of native shallow acceptors in ZnO was found to be negligible [6,25] and PL related to DAPs included shallow acceptors arose only after doping with N, P or As [6,[26][27][28][29][30]. This PL exhibited itself as zero-phonon band with phonon replicas, the position of zero-phonon band being reported to lie in 383-391 nm range depending on the type of the impurity and crystal treatment [6,[26][27][28][29][30][31]. PL bands at 373-375 nm in ZnO(N), ZnO(P) and ZnO(As) samples were attributed to acceptor-bound exciton emission [27,28].…”