Why does the LED light change color?
50 years ago, people had already understood the basic knowledge that semiconductor materials can produce light. The first commercial diode was produced in 1960. LED is English light emitting diode (light emitting diode) abbreviation, its basic structure is an electroluminescentsemiconductor materials, placed on a wire rack, then sealed with epoxy resin around, to protect the internal core function, so the seismic energy LED.The core part of the LED is a wafer consisting of type P semiconductors and type N semiconductors. There is a transition layer between the P type semiconductor and the N type semiconductor, called the p-n junction. In some PN junctions of semiconductor materials, the injected minority carriers combine with the majority carriers to release excess energy in the form of light, thereby converting the electric energy directly into light energy. PN junction plus reverse voltage, the minority carrier is difficult to inject, so it does not emit light. The diode, produced by injection electroluminescent principle, is called light-emitting diode, commonly known as LED. When it in a positive state of the work (which ends with forward voltage), the current flows from the LED anode cathode, semiconductor crystals on the issue from the ultraviolet to infrared light of different colors light and the strength of the current.
Because the light bulb contains three LED led! The three primary colors are adjusted to match each other, so that all colors are produced
The LED lamp has special physical and chemical structure, change colour depending on the current size, when the small current, is red, when the current increases gradually, the color change is orange, yellow, green, blue, indigo and purple color. Specific instructions are as follows: LED lamp and its light emitting principle
