Progress in the control of the light-matter interaction in semiconductors

We discuss the influence of the relative dimensionalities of electron and photon states on the interaction of light and matter in semiconductors. A variety of effects are to be expected, such as the Purcell effect or the strong light-matter coupling, based on the nature of the electronic excitations (independent electron or excitons) and on the nature (planar or 3D microcavities and photonic crystals) and damping of the photonic states. Applications in the field of light-emitting diodes (LEDs) are detailed.