Led fluorescent lampIn 60 s last century, science and technology workers take advantage of semiconductor PN junction light-emitting principle, generate the light-emitting diodes. The material of the LED in the time is GaASP, its luminous color in red. After almost 30 years of generatement, ereallybody is quite familiar with LED, and it can emit red, orange, yellow, green, blue and so on many different colours. However, illumination of white light leds only createed later in 2000, here will introduce it to readers concerning the lighting white LED. The earliest application of semiconductor p-n junction light-emitting principle made of light sources was available in the early 1960 s. That time its materials were utilized inside the GaAsP, red glow. When the drive current is 20 mah, luminous flux only sever
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