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How Does The LED Light Emitting Diode Emit Different Colors?

Mar. 07, 2019

How do LED Light Emitting Diodes emit different colors? We know that each kind of light will have one wavelength. The wavelength of red LED is generally 650~700nm. The wavelength of orange LED is generally 610~630nm. The wavelength of yellow LED. Generally, it is 585 nm, and the wavelength of the green LED is generally 555~570 nm. According to the PN junction, LEDs can emit different colors of light. We are more common in red, yellow, green and blue.

So the question is, how do you need to get light of other colors? Today, LED Digit Tube Three 8 Exporter will give you a detailed explanation. LEDs are current-controlled semiconductor devices that require a series of current-limiting resistors in series. The luminescent color of a popular monochrome LED is related to the wavelength of the luminescence.

For example, our common white light, in theory, blue LED combined with the original red LED and green LED can produce white light, but white LED is rarely made in this way. Most of the white LEDs currently produced are made by coating a blue phosphor on a blue LED. When the LED chip emits blue light, part of the blue light is efficiently converted into a broad spectrum by the crystal. Light. Since yellow light stimulates the red and green receptors in the naked eye, the blue light of the LED itself is mixed to make it look like white light.

The phosphor is mainly divided into aluminate and silicate. The performance of aluminate is better than that of silicate. The aluminate is representative of YAG. The performance of YAG is stable, the light decay is low, and the chemical stability of silicate itself is poor. However, the brightness is higher than that of YAG. The quality of the phosphor directly determines the purity and durability of the light color of the light source. Why some light sources change color after a period of time is caused by the packaging technology and the material.

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