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What Is The Luminous Principle Of Led Lamp?

What Is The Luminous Principle Of Led Lamp?

Oct 11, 2019

LED light emitting diodes are solid - state semiconductor devices that convert electrical energy into visible light.The heart of the LED is a semiconductor chip, which is attached to a support with a negative electrode at one end and a positive electrode at the other end, making the whole chip encapsulated in epoxy resin.An understanding of the principles of LED lighting requires an understanding of its hard and fast conditions.First of all, the production of LED lamps mainly consists of iii-iv group compounds, such as gallium arsenide, gallium phosphide, gallium phosphide and other group compounds, whose core is the PN junction.

There are a large number of positively charged holes and negatively charged ionized impurities in p-type semiconductor.In n-type semiconductors, there are many negative electrons and fixed positive ions, and the positive ions are fixed and the negative electrons are mobile because of the electric field.If the PN junction is applied with a positive voltage, and the p-type junction is positive on one side and the n-type junction is negative on the other side, the flow direction of the current will be from P to N, and the holes and free electrons will move towards the interface, narrowing the space charge area, and the current will pass smoothly.If a reverse voltage is applied to the p-n junction, the holes and free electrons move away from the interface, widening the space charge area so that no current can pass. Therefore, when a positive voltage is applied to the two poles of a semiconductor chip, the PN junction of some compound semiconductor materials will inject a few carriers and a majority of carriers, and the excess energy will be released in the form of light when recombination, so as to realize the conversion from electrical energy to light energy.If a reverse voltage is added, a few carriers are difficult to be injected, so there is no excess energy release for the combination of no carriers, thus the conversion of electrical energy to light energy cannot be realized.This is how LED lights shine.LED to replace incandescent lamp as a new generation of lighting lamps and lanterns, it is incandescent lamp does not have many advantages, such as high efficiency and energy saving, the use of safe, small volume, strong control, green environmental protection, the advantages of long service life, light stability, has made them champions of a free lighting lamps and lanterns of modern society, is also the traditional lighting lamps and lanterns is the root of the relics.