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(Color online) (a) Schematic cross-section diagram of V2™. (b) Optical microscopic image of the backside of V2™ chip with 16 via holes V2™. (c) Optical microscopic image of front side of V2™ with two circular pads and metal grids.
(a) SEM image of the cross section of via hole in a rectangular shape after the LED epitaxial layer growth. (b) SEM image of mesa structure around via hole of V2™.
(Color online) (a) Current vs voltage curves of a V2™ LED (∎) and a conventional power LED (▴). The inset is the distribution of forward voltage at of V2™ (∎) and conventional power LED (▴) chips for 100 chips tested. (b) Integrated optical power vs injection current curves of a V2™ LED (∎) and a conventional power LED (▴).
(Color online) Result of electrical and optical reliability test of V2™ chips at and .
Electrical properties of V2™ and conventionally fabricated LED (Ref.), averaged over 100 chips for each type.
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