What is the UV LED is working and where applicable

Ultraviolet LEDs along with their classic "brothers" is actively gaining niches where not so long ago is still used as fluorescent or gas-discharge UV lamps. This article will consider the operating principle, technical parameters, performance and range of application options. Let's get started.

Principle of operation

Ultraviolet (UV) radiation - invisible to the naked eye of the electromagnetic radiation spectrum of which is located between visible light and X-rays. In fact, significant differences in principle of operation of conventional LEDs and ultraviolet - no concluded as follows:

In the ultraviolet LEDs based on the principle according to which the light is emitted while passing through the semiconductor junction of the constant fixed value current. To create namely ultraviolet radiation used additives such as aluminum gallium arsenide, gallium nitride, aluminum nitride, and etc. As a result, LEDs are obtained from the emission spectrum ranging from 100 to 400 nm (UV proximal portion - range).

In this case the radiation intensity is changed by controlling the current passing.

The main parameters of the UV - LED

So, to the main parameters of UV LEDs are the following characteristics:

1. The wavelength of the emitted light. This parameter is mandatory in the passport is displayed to the product and may be in the range of from 100 to 400 nm.

2. Light flow. One of the main characteristics of the LED, which has a direct relationship with its power. For conventional LEDs, this parameter is measured in lumens, but for LEDs with highly directional diagram often indicate the power of light - light output divided by the solid angle. In this case, this parameter is measured in candelas.

3. The nominal operating current. This option can also be found in the passport data of the product and it is necessary for the proper selection of power supply.

4. Direct voltage. This value is specified when operating (glowing) the LEDs and UV Diode this value may be 3-4.5 volts.

Here parameters such as the pulsation ratio, color temperature and color rendering index for the LED spectrum irrelevant ultraviolet radiation.

Versions

The outer casing of the UV LED is directly dependent on the destination device in which it will be used, as well as its power. So if the power is weak, the applied-18 or the TO-39 housing.

Since housing is still cooling radiators, then form them can be quite varied. So one of the most common embodiment, a standard casing type Emitter, which is designed for direct mounting on the surface and in the special housing SMD

Application area

Inherently UV LEDs have replaced the classical sources of UV radiation, with the result that the range of their use is far higher than that of conventional LEDs:

- Medical equipment. UV LEDs are used for the disinfestation of premises, as well as for curing composite dental fillings.

- Industry. Some manufactures UV sources used to accelerate the polymerization and adhesive compounds.

- the financial sector. The apparatus is used to verify the money is such UV-LEDs.

- Forensics. So thanks to the UV LEDs legal representatives seek out easily labeled bills traces of biological fluids on various subjects, etc.

- Vegetable. Short exposure of plants in greenhouses in which stimulates the production of polyphenols, these should have antioxidant properties.

- Cosmetology. Solariums and drying nail simply can not operate without these diodes.

The list goes on for a long time, and constant research more open areas for use of such products.

conclusion

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