Color center luminescence decay times in optical microcavities based on LiF films

Controlling and modifying spontaneous emission in optical microcavities is of great interest for both their basic properties and for their potential applications in emitting solid-state devices. Spatial and temporal spontaneous emission modifications of F2 color centers in LiF films placed inside planar optical microcavities are reported. Angularly resolved photoluminescence measurements show a narrowing and an enhancement of the emission spectrum along the cavity axis; time resolved luminescence measurements in different geometrical configurations show a shortening of luminescence decay time along the microcavity axis.