New growth techniques
In the 1970s, new crystal growth techniques, MBE (Molecular Beam Epitaxy) [23] and MOVPE (Metalorganic Vapour Phase Epitaxy) [24] were developed. Efforts were made to adapt these techniques for growing GaN [25]. Isamu Akasaki began studying GaN as early as 1974, at the time working at the Matsushita Research Institute in Tokyo. In 1981, he took up a professorship at Nagoya University and continued his research on GaN, together with Hiroshi Amano and other co-workers. It would take until 1986 before GaN with high crystal quality and good optical properties could be produced with the MOVPE technique [26].