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An approach fully based on the rf magnetron sputtering of a pure silica target has been developed to deposit a silicon nanocrystal based optical planar microcavity. Tunable narrow emission bands, directionality of the radiation pattern along the normal of the cavity surface, and resonant enhancement of the luminescence intensity have been demonstrated. Time resolved photoluminescence measurements also confirmed an increase of the spontaneous emission rate of silicon nanocrystals when they are embedded inside the optical resonator. These results are attributed to the anisotropic redistribution of the optical density of states induced by the resonator.