- Induced pluripotent stem (iPS) cells that differentiate and then proliferate in various organs
- High temperature superconductive wire to be used in electric power transmission
- Counteracting a flu pandemic crisis
- Fourth generation optical disc to follow Blu-ray discs
- Generating ultra-thin films at the molecular level
- Fundamental regenerative medicine technology: Generating cell sheets
- Discovery and clinical application of the gene responsible for lung cancer
- Clarifying the function of substances that recognize pathogens and activate the immunity system
- Transparent semiconductor from common materials
- Finding a new family of high temperature superconducting materials
- Development of highly functional and high performance light-emitting element originating in blue
- Organic synthesis method without use of organic solvents
- Plastic optical fiber that allows High-speed, large-capacity communication
- Enabling extra-large capacity hard disks
Nakamura Inhomogeneous Crystal Project
Shuji Nakamura (Professor of University of California, Santa Barbara)
Investigation and control of inhomogeneity of nitride semiconductors
Realization of lighting with less environmental load through utilizing highly effective white LEDs
This research focused on "inhomogeneity", a particularity of nitride semiconductors which play a major role in various applications such as blue laser diodes and high-intensity light-emitting diodes. An attempt was made to realize bulk growth of homogeneous perfect crystals, as well as to enhance device characteristics by intentional utilization of inhomogeneity.
Impact of Research Achievements
■ This was a world-leading development, and formed a significant technological trend in the research of nitride semiconductors.
■ Produced nonpolar and semipolar LEDs with external quantum efficiencies that exceed those of the conventional LEDs. Opened up the path to the production of next-generation LED and laser diode.
■ Realized the world's first nonpolar blue-violet laser diode.
■ Pioneered the path to a practical way to grow bulk GaN crystals by ammonothermal method.
■ Promoted the physical understanding of GaN group materials through the investigation of light-emitting mechanism, etc., and provided a guideline for the design of a wide variety of devices.
■ Established a venture company toward a full-scale practical use of this technology.
■ Size of the global market of the white LED package will be about 840 billion yen (estimated value in 2013).
Semipolar surface green LED
Nonpolar blue-violet laser diode
Polar surface, nonpolar surface and semipolar surface of GaN crystal