LED development history

LEDs were fabricated using the principle of semiconductor P·N junction light source. In the early 1960s, red light-emitting diodes first appeared in 1964, followed by yellow LEDs. It was not until 1994 that blue and green LEDs were successfully developed. In 1996, a white LED was successfully developed by Japan Nichia Corporation (Japan).

LEDs are widely used in indicators, signal lights, displays, landscape lighting, etc., because of their inherent characteristics, such as power saving, long life, vibration resistance, fast response, and cold light source. They are everywhere in our daily life. , household appliances, telephones, dashboard lighting, automotive anti-fog lights, traffic lights, etc. However, due to the limitations of its brightness and high price, it cannot be promoted as a universal light source.

In recent years, with the continuous deepening of research on semiconductor luminescent materials, the continuous advancement of LED manufacturing processes and the development and application of new materials (nitride crystals and phosphors), ultra-high brightness LEDs of various colors have made breakthroughs. Progress, its luminous efficiency has increased by nearly 1000 times, and all colors in the visible light band have been achieved in terms of chromaticity. The most important one is the emergence of ultra-high brightness white LEDs, making it possible for LED applications to leap into the high-efficiency lighting source market. It has been pointed out that high-brightness LEDs will be one of the greatest inventions after humans invented incandescent bulbs.

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