Low Operating Voltage and High Efficiency Vertical GaN Based LEDs

Abstract

Vertical GaN based Light Emitting Diodes (VLED) on metal alloy base were realized [1] and characterized for solid state lighting application. An operating voltage of less than 2.9 Voltage from a high efficiency and high power blue LED was achieved. And, an efficiency of more than 120 lumens/watt from a white LED was achieved also. The dissipate heat more effectively than conventional and flip-chip LEDs, thanks to the higher thermal conductivity of a copper alloy base. This increases their maximum operating current and output power and makes them more suitable for solid-state lighting applications. In addition, these VLED exhibit many advantages over those on sapphire under extreme operation conditions for general lighting application. KeywordsLEDs, Solid State Lighting, VLED