Tunable, narrow, and directional luminescence from porous silicon light emitting devices

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Abstract
Controlled room-temperature photoluminescence (PL) and electroluminescence (EL) from porous silicon (PSi) multilayer structures are achieved. The basic structure is composed of two PSi multilayer mirrors sandwiching a highly luminescent PSi film. This creates an active microcavity resonator, in which a significant PL and EL line narrowing is observed. EL from a microcavity resonator is shown to have a high angular concentration of the output emission (30° around the normal axis). A tunable and narrow EL device, from an all-PSi microcavity resonator is presented, which offers the possibility for high spectral purity, flat-panel displays.