HIGH BRIGHTNESS LED HAVING ROUGHENED ACTIVE LAYER AND CONFORMAL COATING Russian patent published in 2015 - IPC H01L33/22 

FIELD: physics, optics.

SUBSTANCE: invention discloses a light-emitting device and a method of making said device. The light-emitting device comprises a first layer having top and bottom surfaces, said top surface comprising a first material of a first conductivity type and including a plurality of pits in a substantially flat surface, wherein said top and bottom surfaces are characterised by a distance in between them, which is shorter in said pits than in regions outside said pits; an active layer overlying said top surface of said first layer, wherein said active layer is capable of generating light characterised by a wavelength when holes and electrons recombine therein; a second layer comprising a second material of a second conductivity type, said second layer comprising a top coating layer having top surface and a bottom surface, said bottom surface overlying said active layer and conforming to said active layer, said top surface having depressions therein that extend into said pits; and a substrate on which said first layer is formed, said substrate having a lattice constant sufficiently different from that of the first material to give rise to dislocations in the first layer, wherein said pits are characterised by a bottom point closest to said substrate, said pits arranged such that said bottom point of each of said pits lies at a different one of said dislocations.

EFFECT: high radiation efficiency.

17 cl, 5 dwg