Patent ID: 8823157
Filing Date: 2014-09-02
Classification: H01L

Abstract:
1. A three dimensional light-emitting-diode (LED) stack, comprising: a substrate; a plurality of Light Emitting Diodes stacked on said substrate, wherein each of said plurality of Light Emitting Diodes includes a p-type layer, an n-type layer, and a planar active layer made from an inorganic semiconductor material sandwiched between one of said p-type layers and one of said n-type layers, wherein said Light Emitting Diodes of said plurality thereof are devoid of p-type layers and n-type layers shared in common between two of said Light Emitting Diodes, and said plurality of Light Emitting Diodes are further devoid of filters, said plurality of Light Emitting Diodes being electrically and structurally intercoupled by solder bumps, wherein said plurality of Light Emitting Diodes include: at least a first Light Emitting Diode (LED) stacked on said substrate, and at least a second LED stacked on said first LED at a distance from said substrate larger than said first LED, wherein an energy gap of said first LED is smaller than an energy gap of said second LED; a first light transmission material disposed between said first LED and said second LED; and a first conduction layer disposed on a top surface of said first light transmission material and connected electrically to at least said second LED.