The invention concerns an light-emitting diodes whereby the emitting medium for converting electron-hole pairs into photons is comprised between parallel mirrors. The converting means (quantum wells or the like) and the first and second mirrors are designed to simultaneously ensure the confinement between the mirrors of a guided propagation mode. To reach a good extraction efficiency of the LED, the device comprises light extracting means such as gratings, which may be lying across the mirrors and the n and p contacts.