Patent ID: 8304756

Claim:
A light-emitting device comprises of a a. an ultraviolet light-emitting structure having i. a first layer with a first conductivity, and ii. a second layer with a second conductivity; iii. an light emitting quantum well region between above said first layer and second layer b. a first electrical contact in electrical connection with said first layer; c. a second electrical contact in electrical connection with said second layer; and d. an template serving as a platform for said ultraviolet light-emitting structure, said template having i. a first buffer layer, said buffer layer being trenched, and ii. a second buffer layer being coalesced over said first buffer layer, said second buffer layer being made of Al x In y Ga 1-x-y N, wherein 0<x≦1, 0≦y≦1, 0<x+y≦1, whereby, when an electrical potential is applied to said first and second electrical contacts, said device emits ultraviolet light.