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Analysis Of Color Changing Work Of LED Lights

Color: The color can be changed by changing the current. The light-emitting diodes can be easily chemically modified to adjust the band structure and band gap of the material to achieve red, yellow, green, blue, and orange multicolor light emission. For example, a red LED at a low current can turn orange, yellow, and finally green as the current increases. Why can LED lights change color? The core part of a light-emitting diode is a chip composed of a p-type semiconductor and an n-type semiconductor. There is a transition layer between a p-type semiconductor and an n-type semiconductor, called a pn junction. In the PN junction of some semiconductor materials, the injected minority carriers and the majority carriers will release excess energy in the form of light, thereby directly converting electrical energy into light energy. A reverse voltage is applied to the PN junction, and minority carriers are difficult to inject, so it does not emit light. This type of diode made using the principle of injection electroluminescence is called a light-emitting diode, and is commonly called an LED. When it is in the forward working state (that is, the forward voltage is applied to both ends), why the LED light can change color, when the current flows from the LED anode to the cathode, the semiconductor crystal emits different colors of light from ultraviolet to infrared, the intensity of light Related to current.

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