This section provides overview, applications, and principles of uv led. Also, please take a look at the list of 12 uv led manufacturers and their company rankings.
Ultraviolet rays are classified into three categories according to their wavelength range: UV-A (320 to 380 nm), UV-B (280 to 320 nm), and UV-C (200 to 280 nm).
Until now, lamps such as mercury and metal halide lamps have been the basic source of ultraviolet light, but their short lifespan and the time it takes for them to stabilize have created a high demand for LEDs to replace them. However, the difficulty of achieving high brightness has hindered their widespread use, and this problem is now being solved.
UV LEDs are used in a variety of applications because they have different effects depending on their wavelengths.
UV-A is often used to promote the effects of resins by photo-reaction, while UV-B is mainly used in the medical field, where it is widely used for atopic disease treatment and photodynamic therapy (PDT) of cancer using photosensitizers. UV-C has a very high sterilizing effect and is used for sterilization, mold prevention, and odor prevention in familiar home appliances such as refrigerators, air conditioners, and water purifiers.
Like LEDs at other wavelengths, UV LEDs use the interaction of electrons and holes at the junction of n- and p-type semiconductors.
When an electric field is applied in the forward direction, the electrons in the conduction band transition to the valence band, and when they annihilate with holes, they emit light with a wavelength corresponding to the band gap. Since the band gap varies depending on the material that makes up the semiconductor, the wavelength can be tuned by changing the composition.
UV LEDs are usually fabricated using aluminum gallium nitride, which has a low output power. However, recent technological advances have made it possible to achieve output power even in UV-C, which has been particularly difficult to achieve high output power.
Previously, there was a structural problem of light loss due to the absorption of emitted light by the substrate, but this problem has been improved by surface processing using nanotechnology on the substrate surface.
In recent years, deep UV LEDs have attracted attention as an alternative light source to mercury lamps. Deep ultraviolet light has a wavelength of 100 to 280 nm, which is the shortest wavelength of all ultraviolet light.
It also has the highest energy among ultraviolet rays and is highly destructive to living organisms. Taking advantage of this destructive power, deep UV LEDs are used in a wide range of fields, including environmental fields such as water and air purification, medical fields such as prevention of nosocomial infection of coronaviruses and other viruses, and industrial fields such as adhesion, printing, and coating.
Characteristics include low environmental impact, a size of only a few millimeters, energy savings, and a long life of more than 10,000 hours.
However, it is important to note that the wavelength of the light is 320 nm or less, which is said to have adverse effects on the human body. Therefore, it is necessary to take measures to avoid looking directly at the deep ultraviolet light by wearing protective goggles or other means.
According to a report published by Taiwan TrendForce Corporation on May 1, 2020, the demand for UV LEDs is growing rapidly due to a significant increase in consumer awareness of disinfection in the wake of COVID-19.
Due to the prevalence of COVID-19 worldwide, we forecast a compound annual growth rate of 60% from 2019 to 2024. Maternity products and other products combined with UV sterilization capabilities are driving the demand for UV LEDs in the market.
The market is expected to grow as people become increasingly hygiene-conscious.
The price of UV LEDs ranges from a few tens of yen to several thousands of yen, depending on their performance.
For example, the price of UV LEDs sold by Nichia Corporation is approximately 6,100 yen for a type with a peak wavelength of 365mm and an output of 1030mW. The price of UV LEDs sold by TLSC in Taiwan is approximately 1,400 yen for a type with a peak wavelength of 420 mm and an output of 560 mW.
Demand is expected to increase in the future due to the coronavirus, and as mass production technology advances, prices are expected to become even cheaper.
*Including some distributors, etc.
Sort by Features
Sort by Area
This is the version of our website addressed to speakers of English in the United States. If you are a resident of another country, please select the appropriate version of Metoree for your country in the drop-down menu.