Long-lived blue phosphorescence of oxidized and annealed nanocrystalline silicon

Gelloz, Bernard; Koshida, Nobuyoshi
May 2009
Applied Physics Letters;5/18/2009, Vol. 94 Issue 20, p201903
Academic Journal
It is shown that an appropriate combination of thermal oxidation and high-pressure water vapor annealing for nanosilicon leads to efficient blue-band phosphorescence with a lifetime of several seconds. Based on spectroscopic analyses on both the temperature dependence of decay dynamics and the change in the peak wavelength with the excitation energy, the phosphorescence is related to luminescence centers in nanosilicon network embedded within high-quality oxide. By controlled oxidation, slow blue transitions via triplets are revealed in nanosilicon separately from the conventional fast band.


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