The development of LED lighting
Using the principle of semiconductor P·N junction light source to make LEDs came out in the early 1960s. In 1964, red light-emitting diodes first appeared, followed by yellow LEDs. It was not until 1994 that blue and green LEDs were successfully developed. In 1996, the white LED was successfully developed by the Japanese company Nichia (Nichia).
With its inherent characteristics, such as power saving, long life, vibration resistance, fast response speed, cold light source, etc., LEDs are widely used in indicator lights, signal lights, display screens, landscape lighting and other fields, which can be seen everywhere in our daily lives. , Household appliances, telephones, instrument panel lighting, automobile anti-fog lights, traffic lights, etc. However, due to its poor brightness and high price, it cannot be popularized and applied as a general-purpose light source.
In recent years, with the continuous deepening of research on semiconductor light-emitting materials, the continuous progress of LED manufacturing technology and the development and application of new materials (nitride crystals and phosphors), various colors of ultra-high-brightness LEDs have achieved breakthroughs. Progress, its luminous efficiency has increased by nearly 1,000 times, and all colors in the visible light band have been realized in terms of chromaticity. The most important of these is the emergence of ultra-high-brightness white LEDs, making it possible for the LED application field to leap over to the high-efficiency lighting source market. Someone once pointed out that high-brightness LED will be one of the greatest inventions of mankind since Edison invented the incandescent light bulb. Under the background of the current global energy shortage worrying once again, energy conservation is an important issue facing us in the future. In the field of lighting, the application of LED light-emitting products is attracting the attention of the world. LED is a new type of green light source product. It is bound to be the trend of future development. The 21st century will enter the era of new lighting sources represented by LEDs.
Compared with incandescent bulbs, LED bulbs have the biggest development motivation because of their advantages in energy saving and environmental protection. The rapid development of the former LED industry has made the price of some LED lighting products lower than incandescent lamps or equivalent levels, making it acceptable to ordinary people, and the brightness is better than that of incandescent bulbs. Such as: plastic bulbs, patch car aluminum, downlights, etc. If you do the project, you still have to choose some high-quality LED products to ensure its stability in all aspects, and of course the price will be higher.
The development of China's semiconductor lighting industry is improving, and the development of epitaxial chip companies is particularly rapid, the scale of packaging companies continues to maintain rapid growth, and the lighting application has made greater progress. In 2007, the output value of China's LED application products exceeded 30 billion yuan, and it has become the world's largest producer and exporter of application products such as LED full-color displays, solar LEDs, and landscape lighting. A new semiconductor lighting industry is taking shape. The domestic lighting field has formed certain characteristics, among which outdoor lighting has developed the fastest. There have been hundreds of LED street lighting companies and dozens of demonstration roads have been built, but they are still lagging behind in the indoor general lighting market.