White emission from InGaN multi-quantum wells on c-planes and nano-pyramids hybrid structure

We report a white emission from InGaN multi-quantum wells (MQWs) on micro size c-planes and nano size hexagonal pyramids hybrid structure. Despite simultaneous growth, we achieve two different emission peaks of 461 nm and 568 from the MQWs on the c-planes and on the nano-pyramids, respectively. Using the structure, we achieve a white emission spectrum which is close to that of a phosphor-converted white light emitting diode (LED).