The history of the leds

Origin < / p> < p> < p> in the 1960 s, science and technology workers by using the principle of light-emitting semiconductor PN junction, and develop the LED light-emitting diodes. Developed the LED at the time, the material is GaASP, its light color to red. After nearly 30 years of development, everybody is familiar with leds, already can emit red, orange, yellow, green, blue and so on a variety of colours. However, illumination of white light LED developed in only 2000 years later, here introduce to the readers about the lighting white LED. < / p> < / p> < p> development In the mid - 70 - s, the introduction of elements In, and N, make leds to produce green ( λp = 555海里) , yellow light, λp = 590海里) And orange light ( λp = 610海里) , luminous efficiency is also increased to 1 lumens/watt. < / p> in the early 90 s, the red light, yellow light GaAlInP and hair green, and blue lights GaInN developed two kinds of new materials, the LED luminous efficiency are improved greatly. < / p> < p> in 2000, the former is made of LED in the red, orange, λp = 615海里) The photosynthetic efficiency of 100 lumens per watt, while the latter made of LED in the green area ( λp = 530海里) The luminous efficiency can reach 50 lumens/watt. < / p> < p> chaozhou xiang li electrical appliance factory specializing in the production of small night light light and night light, LED rechargeable small desk lamp socket. < / p> < p> < / p> article source: li 3 c electric light a night light ea - gl。 com < / p> < p> < / p> < p> < / p>
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