Patent ID: 7839909

Claim:
A heterostructure based on semiconductor compounds, said heterostructure containing at least one active layer, at least two reflective layers, at least as one on each side of the active layer, said reflective layers forming at least of one sublayer and having refractive indices lesser than the effective refractive index n eff of the said heterostructure, said heterostructure containing a leak-in region, the leak-in region being transparent for emission and located between said active layer and a corresponding reflective layer, said leak-in region located at least on one side of said active layer, said leak-in region being at least one, said leak-in region including at least one leak-in layer having a refractive index n IN and consisting at least of one sublayer, as well as said leak-in region having at least one confining layer consisting at least of one sublayer, wherein into said leak-in region a main adjusting layer is additionally introduced, consisting at least of one sublayer and having at least for one of its sublayers a refractive index no less than the refractive index n IN of said leak-in layer, one of surfaces of said main adjusting layer being adjacent to said active layer, while on the opposite surface of said main adjusting layer there is said confining layer having a refractive index lesser than the refractive index of said main adjusting layer, wherein the ratio of the effective refractive index n eff of the heterostructure to the refractive index n IN of the leak-in layer, namely—the ratio of n eff to n IN is determined within the range from one plus delta to one minus delta, where delta is determined by a magnitude much lesser than one.