Light-Emitting Diodes: A Primer

Semiconductors that can change the form of electrical energy into light energy are known as light-emitting diodes, or LEDs. LEDs are often categorised according to one of three wavelengths: ultraviolet, visible, or infrared. The material and composition of the semiconductor determines the colour of the light that is emitted by the device.

LEDs that are commercially available and have a single-element output power of at least 5 mW have a wavelength range that extends from 275 to 950 nm. Regardless of the manufacturer, the components for each wavelength range all come from the same family of semiconductor materials. In this post, we will take a high-level look at the LED industry as well as provide an outline of how LEDs work. There are many different kinds of LEDs, and we will talk about those, along with the wavelengths that correlate to them, the materials that are used in their construction, and some applications for the various lights.

Ultraviolet LEDs (UV LEDs): 240 to 360 nm

UV LEDs find their most common application in the field of industrial curing, followed by water disinfection and then medicinal and biomedical applications. At wavelengths as short as 280 nm, it has been possible to generate levels of power production that are larger than 100 mW. At wavelengths 360 nm or longer, gallium nitride/aluminum gallium nitride (GaN/AlGaN) is the material that is most commonly utilised for ultraviolet light emitting diodes (LEDs). Materials with their own intellectual property rights are used for shorter wavelengths. Shorter wavelengths are made by just a select few providers, and the prices for these LEDs are still quite high in comparison to the pricing of the rest of the LED product offerings. However, the market for longer wavelengths, those with a length of at least 360 nm, is becoming more stable as a result of falling prices and an abundance of suppliers.

LEDs that range from near-ultraviolet to green: 395 to 530 nm

Indium gallium nitride (InGaN) is the material that is used for the production of items that fall into this wavelength range. Even though it is theoretically possible to produce a wavelength at any point between 395 and 530 nm, the vast majority of large suppliers focus their efforts on generating blue LEDs (in the range of 450 to 475 nm) for use in the production of white light with phosphors and green LEDs in the range of 520 to 530 nm for use in the green lighting of traffic signals. The technology behind these LEDs is considered to be advanced in most circles. Over the course of the past few years, there has been little to no progress made towards increasing the optical efficiency.

LEDs ranging from yellow-green to red: 565 to 645 nm

The semiconductor material that is employed for this wavelength range is known as aluminium indium gallium phosphide, or AlInGaP for short. The colours traffic signal yellow (590 nm) and traffic signal red (625 nm) are the ones that are used to manufacture it the majority of the time. In addition, the lime-green (or yellowish-green 565 nm) and orange (605 nm) wavelengths are accessible with this technology; however, their availability is more restricted.

It is noteworthy to note that neither the InGaN nor the AlInGaP technologies are now capable of producing a pure green emitter with a wavelength of 555 nm. There are some older technologies that aren't as efficient in this completely green zone, but those technologies aren't deemed to be bright or efficient. This is partly owing to a lack of interest and consequently a lack of demand from the market, which has resulted in a lack of financing to develop alternative material and manufacturing processes for this wavelength range.

660 to 900 nanometers (nm), often known as "deep red to near-infrared" (IRLEDs)

The structure of the devices used in this region can take on a great number of different forms, but they all make use of some kind of aluminium gallium arsenide (AlGaAs) or gallium arsenide (GaAs) material. Infrared remote controls, night-vision illumination, industrial photocontrols, and different medical applications (at 660–680 nm) are all examples of applications for this wavelength range.

The working theory behind LEDs

LEDs are a type of semiconductor diode that produce light when an electrical current is passed through the device in the forward direction. An electrical voltage must be applied to the device in order for the electrons to move across the depletion region and combine with a hole on the other side to create an electron-hole pair. When this takes place, the electron gives out its stored energy in the form of light, which ultimately results in the emission of a photon.

The emitted light will have a wavelength that is determined by the bandgap of the semiconductor. Because shorter wavelengths correspond to higher energy levels, substances with a bigger bandgap are responsible for emitting shorter wavelengths. Conduction in materials with a greater bandgap necessitates the use of higher voltages. LEDs that emit a short wavelength of UV-blue light have a forward voltage of 3.5 V, whereas LEDs that emit near-infrared light have a forward voltage ranging from 1.5 to 2.0 V.

LEDs are currently used in a wide variety of sectors and applications across a variety of industries. These devices are very reasonably priced and appealing to both the consumer market and the industrial market as a result of their high level of dependability, high level of efficiency, and reduced overall system cost when compared with lasers and lamps. LEDs come in a variety of colours and technologies, and each one was designed to suit a particular application and set of needs.

High Power Uv Led Light

Features:

● High Wattage uv led light are similar in size and shape to conventional germicidal UV lamps but are capable of operating at higher UV output.

● High Wattage uv led light are widely used in forced air duct systems and water disinfection applications.

● High Wattage uv led light are often found in odor control and photochemical applications.

● Available in Low Ozone and Ozone Producing versions.

Specification: