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And then to the 1950 s, the British scientists in electroluminescent experiment with semiconductor gallium arsenide just invented the first modern sense has LED, and appeared in the s. It is said that in the early days of the experiment, the LED need placed in liquid nitrogen, more need further operation to break through to the efficient work at room temperature. The first commercial LED can only send the invisible infrared radiation, but quickly applied in induction and photoelectric domain. May now use on the remote infrared tubes is from here. Of the s, in the gallium arsenide substrate using phosphating things invented the first red LED. When used materials is GaAsP (gallium arsenic p), glowing red (λ p = 650 nm), in the drive current to 20 ma, flux only to per several lumens, corresponding luminous efficiency about 0.1 lumens/watts. To the mid 70's, the introduction of elements In and N, LED Tubes by double phosphating gallium chip, produce green light (λ p = 555 nm), (a red, a green) can emit yellow (λ p = 590 nm) and orange light (λ p = 610 nm), efficacy also improve to 1 lumens/watts. At this time, Russian scientists using emery invention can emit yellow LED, although it as Europe's efficiency. But in the 70 s, it can emit pure yellow light. In the early 80 s, gallium arsenide phosphating aluminum makes use of the first generation of high brightness LED the birth of the first red (GaAlAs LED light source makes red LED efficiency up to 10 lumens/watts), then is yellow, green. By the early 1990 s, use indium gallium aluminum phosphate production out of the orange red, yellow and green light LED.