6. Conclusion
The development of the blue light emitting diode and blue laser has completed the light spectrum for semiconductor devices. Blue light emitting semiconductor devices are expected to enable a wide range of electronics-related applications (large and bright full-color displays, traffic control signals and lightning lamps). Of special importance, white LEDs are expected to contribute to the reduction of electric power consumption through a high level of light emission efficiency and to the reduction of waste through its longer life.
Akasaki and Amano, and Nakamura, respectively, succeeded in developing blue light emitting semiconductor devices through highly creative approaches, which enable many applications in human life and extend the wealth, richness, and happiness of people.
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