Monolithic white LED with controllable color temperature

We have developed monolithic white light emitting diodes (LEDs), which consist of planar planes and nano size hexagonal pyramids structure. The white spectrum is achieved by blue and yellow emissions from the InGaN multi quantum wells (MQWs) on the planar c-planes and on the nano-pyramids, respectively. The color temperature is tuned from 3600K to 6400K by controlling the relative area ratio of c-plane and nano-pyramids.