Why do LEDs emit light? Why LEDs emit light in various colors

LED lights do not have filaments to shine on what basis.

It uses an electric current that is passed through a diode in the forward direction to emit light. When the forward voltage is added to the PN junction of the light-emitting diode, the potential barrier of the PN junction decreases, and the diffusion motion of the carriers is greater than the drift motion, resulting in the injection of holes in the P region into the N region, and the electrons in the N region are injected into the P region.

The dark forces are defeated by the light of justice.

LEDs, also known as organic light-emitting diodes, use the current that passes through the diode in the forward direction to emit light. When the forward voltage is added to the PN junction of the light-emitting diode, the potential barrier of the PN junction decreases, and the diffusion motion of the carriers is greater than the drift motion, resulting in the injection of holes in the P region into the N region, and the electrons in the N region are injected into the P region.

Different diodes emit different colors because of the different materials inside them (different wavelengths of light), such as gallium arsenide diodes emit red light, gallium phosphide diodes glow green, and silicon carbide diodes glow yellow. White light is a composite of orange and blue or red, green and blue, and the material in it can also change the luminous wavelength and fine-tune the color, such as emerald green, light red, light blue, etc.

LEDs use electric current and semiconductor crystals to emit light of various colors.

The core part of a light-emitting diode is a wafer composed of p-type semiconductors and n-type semiconductors, and there is a transition layer between the p-type semiconductor and the n-type semiconductor, called the p-n junction.

In the PN junction of some semiconductor materials, when the injected minority carriers are recombined with the majority carriers, the excess energy is released in the form of light, thus directly converting electrical energy into light energy.

The PN junction is added with a reverse voltage, and a few carriers are difficult to inject, so they do not emit light. When it is in the forward working state, when the current flows from the LED anode to the cathode, the semiconductor crystal emits light of different colors from ultraviolet to infrared, and the intensity of the light is related to the current.

The LED light-emitting principle is the use of light-emitting diodes.

LED lamp luminous principle: the PN junction in the LED, under the action of voltage drive, the internal electrons and holes will be compounded, and the recombination process energy will be released in the form of luminescence, which is the working principle of LED lights. The principle of LED light emitting is the use of light-emitting diodes, and now there are all kinds of LED lamps and LED lamps of various colors, LED lamps are a very energy-saving bulb.

LED lights made of different materials can emit different colors, such as red, blue and so on.

The core part of the light-emitting diode is a wafer composed of p-type semiconductors and n-type semiconductors, and there is a transition layer between the p-type semiconductor and the n-type semiconductor, called the p-n junction, which usually adopts a double heterojunction and quantum well structure.

LED is the abbreviation of light emitting diode, the Chinese name "light-emitting diode" Its luminescence principle is similar to the generation of laser. There are many energy levels for electrons in an atom, and when an electron jumps from a higher energy level to a lower energy level, the energy of the electron decreases, and the reduced energy is converted into photons that are emitted. A large number of these photons are lasers.

LEDs work in a similar way. However, the difference is that LEDs do not emit light through the electronic transition inside the atom, but by adding a voltage to the PN junction of the LED, so that the PN junction itself forms an energy level (in fact, a series of energy levels), and then the electrons jump on this energy level and produce photons to emit light.

A semiconductor wafer is made up of two parts, one is a p-type semiconductor, in which holes dominate, and the other end is an n-type semiconductor, which is mainly electrons here. But when these two semiconductors are connected, a p-n junction is formed between them. When the current is applied to the wafer through the wire, the electrons will be pushed to the p-region, where the electrons will recombine with the holes, and then the energy will be emitted in the form of photons, which is the principle of LED light emitting.

The wavelength of light, which is the color of light, is determined by the material that forms the p-n junction.

LED, or light-emitting diode, is an electronic device that converts electrical energy into light energy and plays a vital role in electronics, lighting, and more. So, what is the luminous principle of LED?

Electroluminescence effect.

The luminescence principle of LEDs is based on the electroluminescence effect. When an electric current passes through a p-n junction, a structure made up of electrons and holes, they collide with each other and energy release occurs. This energy is then released and transferred to the semiconductor material in the LED chip, which excites the energy and produces light.

The importance of materials.

The material is very important for the luminous effect of LEDs. Different semiconductor materials will have different effects on the luminous wavelength, brightness, efficiency, etc. of LEDs. For example, when the semiconductor material is gallium nitride, LEDs emit light brighter and more efficiently.

Energy conversion. The luminous principle of LED is fundamentally a process of energy conversion. The electrical energy in the LED chip is converted into light energy after being acted on by the material.

When we use LED bulbs, the light energy will be converted into heat energy and light, which is the basic working principle of LED bulbs.

Temperature effects. Different kinds of LEDs will be affected by temperature in use. The higher the temperature, the easier the energy transfer between the electrons and the holes in the LED chip, resulting in more and more intense light.

However, if the temperature is too high, it will cause damage to the material in the LED chip and will adversely affect the life of the LED.

Conclusion. The luminescence principle of LED is based on the principle of electroluminescence effect, and the process of converting electrical energy into light energy is realized through energy conversion. Different kinds of materials and temperatures have a crucial impact on the luminous effect and longevity of LEDs.

Understanding the luminous principle of LEDs can help us better use LED products and play a better role in practical applications.

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What is the luminous principle of LED lights?

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LED lamps are light-emitting diodes that contain solid-state semiconductors that convert input semiconductors into light energy. In addition, the semiconductor inside the LED lamp is composed of three parts, including p-type semiconductor, n-type semiconductor, and 1 5-period quantum well.

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The luminescence process of LED includes three parts: 1. Carrier injection under forward bias, recombination radiation and light energy transfer. 2. The tiny semiconductor wafer is encapsulated in a clean epoxy resin, and when the electrons pass through the wafer, the negatively charged electrons move to the positively charged hole region and compound with it, and the electrons and holes disappear while generating photons.

The greater the energy (band gap) between the electron and the hole, the higher the energy of the photon produced. <

The luminous process of LEDs consists of three parts:

1. Carrier injection, composite radiation and light energy transfer under forward bias.

2. The tiny semiconductor wafer is encapsulated in a clean epoxy resin, and when the electrons pass through the wafer, the negatively charged electrons move to the positively charged hole region and compound with it, and the electrons and holes disappear while generating photons. The greater the energy (band gap) between the electron and the hole, the higher the energy of the photon produced.

3. The energy of the photon corresponds to the color of the light, and in the spectrum range of visible light, blue light and purple light carry the most energy, and orange light and red light carry the least energy. Since different materials have different bandgaps, they are able to emit different colors of light.