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The Development History Of LED Lights
Jul 10, 2017


The 20th century, 60 years, science and technology workers using semiconductor PN junction light principle, developed into LED light-emitting diodes. At that time the development of the LED, the material used is GaASP, its light color is red. After nearly 30 years of development, we are very familiar with the LED, has been able to issue red, orange, yellow, green, blue and other shade. However, the need for white light LED lighting only after 2000 to develop, here to introduce the white light LED lighting.

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The earliest application of semiconductor P-N junction light principle made of LED light source came out in the early 20th century, 60 years. At that time the material used was GaAsP, red light (λp = 650nm), the drive current of 20 mA, the luminous flux of only a few thousand lumens, the corresponding light performance of about 0.1 lumens / watt.

In the mid-1970s, the elements In and N were introduced to give green light (λp = 555nm), yellow (λp = 590nm) and orange (λp = 610nm), and the luminous efficiency was also increased to 1 lumen / watt.

To the early 80s, there GaAlAs LED light source, making the red LED light visual effects to 10 lumens / watt.

The early 90s, the red, yellow GaAlInP and green, blue GaInN two new materials developed successfully, so that the LED light performance has been greatly improved.

In 2000, the former made LED in the red, orange (λp = 615nm) of the luminous efficiency of 100 lumens / watt, while the latter made of LED in the green area (λp = 530nm) optical performance can reach 50 lumens /watt.

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