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1. Role of light emitting semiconductor device
The amount of digital data used in homes and in offices is increasing in our rapidly developing information society. Light emitting semiconductor devices are key devices for information display and information storage. A "light emitting semiconductor device" is a generic term that refers to electronic devices that use both light emitting diodes (LED) and laser diodes (LD).
Red and green light emitting semiconductor devices were developed in the 1970s. For example, red and green LEDs were used as indicator lights for displays in various electronic products and in signs. The red LD was widely used for optical fiber networks and light pickup in optical storage devices. By completing the light spectrum with the development of blue light emitting semiconductor devices, new applications such as bright, full-color displays and brighter, higher energy efficiency lighting became possible. The blue LD has a short wavelength and can emit a narrow light beam. Applications in high-density optical storage devices, such as the next generation of CDs/DVDs, are expected. The development of blue light emitting devices was highly desired by many electronics companies.
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