Low Operating Voltage and High Efficiency Vertical GaN Based LEDs

Vertical GaN based Light Emitting Diodes (VLED) on metal alloy base were realized 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.