Enhanced Light Output of Vertical-Structured GaN-Based Light-Emitting Diodes with TiO<sub>2</sub>/SiO<sub>2</sub>Reflector and Roughened GaO<sub><i>x</i></sub>Surface FilmWei-Chi Lee, Po-Hung Wang, Kai-Ming Uang et al.|Japanese Journal of Applied Physics|2011Cited by 2