Patent ID: 7488621
Filing Date: 2009-02-10
Classification: H01L

Abstract:
1. A method comprising: growing light emitting diode (LED) layers on a growth substrate, the LED layers comprising a first epitaxial layer of a first conductivity type, a second epitaxial layer of a second conductivity type, and an active layer disposed between the first and second epitaxial layers, wherein a primary emission surface on a first side of the first epitaxial layer is substantially parallel tothe active layer, the LED layers forming at least one individual LED; providing a package substrate wherein a lateral extent of the package substrate exceeds that of an individual LED, the package substrate comprising a support surface having one or more electrical contact pads thereon for electrical connection to the first and second epitaxial layers, the contact pads being electrically connected to metal leads for connection to package terminals; placing the LED layers attached to the growth substrate on the package substrate such the second epitaxial layer is facing a first contact pad on the package substrate; bonding the second epitaxial layer to the first contact pad using a metal interface disposed between the package substrate and the second epitaxial layer, wherein a nearest distance between the primary emission surface and a portion of the package substrate is not more than 50 microns; removing the growth substrate; and further processing the LED layers after the growth substrate has been removed, wherein further processing the LED layers comprises forming at least one light extraction feature in the primary emission surface.