Advantages of light-emitting diodes and how they work？

There are many categories of diodes, and light emitting diodes are one of them. For light-emitting diodes, many friends are still familiar with. In order to enhance your understanding of light-emitting diodes, this article will introduce the working principle of light-emitting diodes, light-emitting diode advantages. If you are interested in diodes, light-emitting diodes, you may wish to read on.

Light Emitting Diode Working Principle

Light-emitting diodes and ordinary diodes are composed of a PN junction, also has a unidirectional conductivity. When the light-emitting diode plus forward voltage, from the P region injected into the N region of the hole and from the N region injected into the P region of the electron, in the vicinity of the PN junction within a few microns of the N region of the electron and the P region of the hole, respectively, composite, resulting in spontaneous emission of fluorescence. Different semiconductor materials have different energy states for electrons and holes. When the electrons and holes compound when the amount of energy released is different, the more energy released, the shorter the wavelength of the light emitted. Commonly used is to send red, green or yellow light diodes. Light-emitting diode reverse breakdown voltage is greater than 5 volts. Its forward volt-ampere characteristic curve is very steep, the use of current-limiting resistors must be connected in series to control the current through the diode.

The core of the light-emitting diode is a wafer composed of a P-type semiconductor and an N-type semiconductor, and there is a transition layer between the P-type semiconductor and the N-type semiconductor, called the PN junction. In some semiconductor materials in the PN junction, the injection of minority carriers and majority carriers will be compounded when the excess energy in the form of light will be released, so that the electrical energy is directly converted to light energy. pn junction plus reverse voltage, minority carriers are difficult to inject, so do not emit light. When it is in the positive working state (i.e., both ends plus positive voltage), the current from the LED anode to the cathode, the semiconductor crystal from the ultraviolet to infrared light of different colors, the intensity of the light is related to the current.

What are the advantages of light-emitting diodes

• energy saving

Light emitting diode adopts super bright high power led light source, and high efficiency power supply combined use, high brightness, than the general lamp to save more than 80% of electricity. Consumption of energy than the same luminous efficiency of incandescent lamps by 80% light-emitting diodes than standard light bulbs to save energy, greatly reducing energy costs. Light-emitting diodes also require less energy than other light sources in the production, reducing the impact on the environment.

• reliability

Ordinary light bulbs in the filament is a very fragile object, vibration is very easy to break. And light-emitting diodes are no glass or filament will break, so make light-emitting diodes in demanding environments or installation difficulties become the perfect light source. Light-emitting time of up to 100,000 hours, light decay of 50% of the initial

• better safety

As light-emitting diodes generate low heat and the need for low voltage makes it a safer light source. Light-emitting diode is a type of light without radiation and infrared radiation type, very resistant to impact, shock resistance is also very strong, light-emitting diode within the filament and the glass shell, is not prone to cracking phenomenon, the use of which will not cause harm to the human body.

• environmental friendliness

Mainly no harmful metals such as mercury and other hazardous substances exist, very environmentally friendly. Just as the global warming issue by more and more people are concerned about, light-emitting diode lighting to reduce energy consumption played a great help. Light-emitting diode not only in the production of energy and materials required less it also does not contain in the fluorescent lamps in the common toxic substances mercury.

• no flicker

Light-emitting diodes are pure DC work, there will be no stroboscopic phenomenon, which eliminates the stroboscopic phenomenon in the process of our use and cause visual fatigue.

• unlimited

Light-emitting diode voltage number can be used globally, that is to say, light-emitting diode full voltage range index is between 85v and 264v, which further ensures that the brightness and service life of the light-emitting diode will not be affected by voltage fluctuations. Light-emitting diodes can reduce the damage to the line, will not cause pollution to the power grid, because its EMI in line with global indicators, power factor greater than or equal to 0.9, the second harmonic distortion is less than or equal to 20%, can reduce the loss of power supply circuit.

• Rugged and durable

Light-emitting diode is completely encapsulated in epoxy resin, it is stronger than the bulb and fluorescent tube. There is no loose part of the lamp body, these characteristics make the light-emitting diode can be said to be not easy to damage.

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