UVLED's Application Field and Protection Issues

The wavelength of ultraviolet rays is between visible light and X -ray. Its wavelength range is 10 to 400nm. However, many photoelectric manufacturers believe that the wavelength of 430nm is also ultraviolet. Although many ultraviolet rays are not seen by people, they are still named for the generatory spectrum of some Violet. UV LED has made great progress in the past few years. This is not only the result of the technological progress of solid -state UV device, but also due to the increase in demand for UV lights that produce harmless environments. The current UV LED supply on the optoelectronics market contains the wavelength range of 265 to 420nm. There are many forms of packaging, such as perforation, surface installation and COB. UV LED generator has a variety of unique applications. However, each generator is independent in the wavelength and output power. Usually, UV light used on LED can be divided into three fields. They are defined as UV-A (long wave ultraviolet), UV-B (medium wave ultraviolet) and U V-C (short wave ultraviolet). UV A device has been produced since 1990. These LEDs are generally used in forged testing or verification (currency, driver's license or file, etc.). The power output requirements of these applications are very low. The actual wavelength range is within 390 to 420N m. The lower wavelength products are not suitable for applications. Because these LEDs' long life cycles and easy manufacturing in the market can be used as a variety of light sources and the cheapest UV products. The UVA LED component field has grown greatly in the past few years. Most of this wavelength range (about 350 390nm) is the production of commercial and industrial materials, such as adhesive, coatings, and inks. Due to the improvement of efficiency, decrease in cost, and miniaturization, LED lights have greater advantages than traditional solidification technology, such as mercury or fluorescent lamps. Therefore, the supply chain is constantly promoting the use of LED technology, making the trend of solidifying LEDs more and more obvious. Although the cost of this wavelength range is significantly higher than that of UV A, the rapid progress of manufacturing technology and the steady increase in yield are gradually reducing the price. The lower UV A and higher UV B wavelength range (about 300-350nm) are the areas that are only recently commercialized. These large potential devices are suitable for many applications, including ultraviolet curing, biomedical, DNA analysis, and various types of sensing. There is a significant overlap in these 3 UV spectral range. Therefore, when choosing, you must not only consider what is the most suitable application, but also need to consider what is the most cost -effective solution. Because lower wavelengths usually mean higher LED costs. UV B and UV C wavelength range (about 250-300nm) are a large extent in the starting stage. However, the enthusiasm and demand for applying such products to the air and water purification system is very strong. At present, only a few companies have the ability to produce UV LEDs within this wavelength range, and even a few companies can produce products with sufficient life, reliability and performance characteristics. Therefore, the cost of the UVC/ B device is still very high, and it is difficult to use in some applications. A common question about UV LED is: Will they bring hidden safety hazards? As mentioned above, UV light has multiple levels. The most commonly used UV light source is a black bulb. This product has been used for decades. It is used to produce light or fluorescent effects for posters, as well as verification of painting and currency. The light produced by these light bulbs is usually in the UV A spectrum, closest to visible light waves and low energy. Although high exposure has been proven to be related to skin cancer and other potential problems, such as accelerated skin aging, the UVA spectrum is the safest in the three UV light. UV C and most UV B light are mainly used for sterilization and disinfection. These wavelengths of light are not only harmful to microorganisms. These LED lights should always be blocked, and they must not look directly at naked eyes, even if it shines very little. Exposed in the light of these wavelengths may cause skin cancer and temporary or permanent vision loss or loss loss.