Vertical InGaN Multiple Quantum Wells Light-Emitting Diodes Structures Transferred from Si(111) Substrate onto Electroplating Copper Submount with Through-Holes

Vertical InGaN multiple quantum wells light-emitting diodes (LEDs) with through-holes structure were transferred from Si(111) substrate onto the electroplating copper submount successfully. The additional series resistances induced by the AlN buffer layer and other interlayer were shorted by the metals filled through-holes. The LED with through-hole structure shows a low vertical conducting operating voltage and a small series resistance. Combining with substrate removal and copper electroplating technique, the operating voltage at 350mA and series resistances of the LED were reduce from 5.6 to 5.1 V and 7 to 4 Omega, in comparison with through-hole LED before substrate removal. At the same time, the light output intensity was improved by 75%, which was mainly attributed to both the removal of light absorptive substrate and the substitution for highly thermal conductive copper submount with metal reflector. (C) 2012 The Japan Society of Applied Physics