Cree Japan, backed by Cree Inc, has recently launched a white LED lamp "XLamp XB-D”, at the 4th LED/OLED Lighting Technology Expo in Tokyo. The company employed a newly-developed LED chip "DA Chip Family" which was developed by improving the light extraction efficiency of a blue LED chip, to realize the small size and higher brightness. It improved the light extraction efficiency by forming several V-shaped ditches on the substrate of the blue LED chip. The DA Chip is made by growing gallium nitride (GaN)-based semicondu...