The latest performance of GaN-based nonpolar and semipolar emitting devices

Here, the latest performance of nonpolar/semipolar LEDs and LDs is described. The authors fabricated LEDs from violet to yellow color region. Conventionally there have been no efficient green LEDs and, as a result no green LDs, which are called as a green gap. The semipolar (20-21) plain was good in green region of LEDs and LDs to fill out the green gap. The performance of semipolar green LEDs was relatively good in comparison with commercially available polar green LEDs. Thus, we succeeded in fabricating green LDs with an emission wavelength of 516 nm at UCSB. Other groups such as Sumitomo Electric Inc. and Soraa Inc. also succeeded in fabricating green LDs with an emission wavelength of 520-530 nm with an output power of about 50 mW using non-polar plains. These promising results indicate a big advantage of nonpolar/semipolar plains to make higher efficient LDs from UV to red color range.