  Metal-halide perovskites are rapidly emerging as solution-processable optical
materials for light emitting applications. Here we adopt a plasmonic
metamaterial approach to enhance photoluminescence emission and extraction of
methylammonium lead iodide (MAPbI3) thin films, based on the Purcell effect. We
show that hybridization of the active metal-halide film with resonant nanoscale
sized slits carved into a gold film can yield more than one order of magnitude
enhancement of luminescence intensity, and nearly threefold reduction of
luminescence lifetime. This shows the effectiveness of resonant nanostructures
in controlling metal-halide perovskite light emission properties over a tunable
spectral range, a viable approach toward highly efficient perovskite light
emitting devices and single-photon emitters.
