GaN-on-GaN technology can be used to grow blue-light laser as a source of lighting with luminous efficiency of 220lm/W, said 2014 Nobel laureate in physics Shuji Nakamura in a speech given inTaipei recently.
Nakamura, currently a professor with the University of California, Santa Barbara, said 2-inch GaN substrates are used in the technology currently, but the size may increase to six-inch. In terms of application to lighting, blue-light laser is better than LED in luminous efficiency and lighting quality, Nakamura indicated.
Taiwan-based LED epitaxial wafer and chip maker Epistar financially sponsors Nakamura's GaN-on-GaN laboratory on a long-term basis in an attempt to step in blue-light laser development.
Source:
http://www.digitimes.com/news/a20150413PD206.html
