| Popis: |
Photoexcitation of ZrO 2 particles causes luminescence ( τ ∼15.0 s) which, after its termination, on addition of H 2 causes emission of a light pulse that displays biphasic decay kinetics ( τ 1 ∼0.9 s and τ 2 ∼15.5 s). The latter emission is referred to as a photoinduced chesorluminescence (PhICL). At 77 K, the longer-lived emission is thermally quenched. The shorter-lived emission is caused by electron trapping by the V a (anion vacancies) low energy traps; the longer-lived emission involves electron trapping by shallow traps, followed by detrapping and subsequent retrapping by the V a traps. Formation of highly energetic radical species is a necessary condition to observe PhICL emission. |
Full Text from ScienceDirect