UV LED will become the next outlet in the lighting industry? !
In recent years, UV-LEDs have sprung up and the market and applications have developed rapidly in recent years. UV curing technology is highly concerned by the world. Compared with conventional UV mercury lamps, UV-LEDs can directly convert electrical energy into UV light. The single-band ultraviolet light is emitted, and the light energy is highly concentrated in the specific ultraviolet light band. Has been widely used in adhesives, paints, inks, coatings and other fields, the industry believes that UV-LED high-efficiency, environmental protection and truly low energy consumption, is a true green industrial technology, many LED companies are actively planning to make a transition UV-LED subdivision areas, the introduction of related application products, UV-LED will become the next outlet in the lighting industry is a general trend.
The emergence of LED has produced tremendous energy benefits for society, making human life more convenient and environmentally friendly, and has made tremendous contributions to mankind. In recent years, LED lighting has been favored for its features such as energy saving, environmental protection, safety, long life, and low power consumption. It is known as the most promising green lighting source in the 21st century.
1. Why UV-LEDs are so popular?
The popular international background of UV-LEDs dates back to 2013. The “Water Mink Convention on Mercury” was formally signed. There are specific provisions in the convention that explicitly limit mercury emissions, including the ban on the production and import and export of mercury-containing products. In these product lists, batteries, switches, relays, soaps, cosmetics, etc. are all people's daily necessities. Although LEDs quickly replace the high-energy incandescent lamps in the field of lighting, other areas of the lighting industry, such as printing, curing, and medical, have not yet completely disabled mercury.
The emergence of UV-LEDs is undoubtedly the dawn of hope. It can not only replace mercury-containing UV light sources, but also further increase its economic and social benefits.
UV-LEDs (ie, UV Light Emitting Diodes, ultraviolet light emitting diodes) are solid-state semiconductor devices that can directly convert electrical energy into ultraviolet light. UV-LED light source operating temperature is usually below 100 °C, with a long life, high reliability, high luminous efficiency, low power consumption, no heat radiation, environmental protection and other characteristics, in recent years in the UV curing gradually got application.
2, UV-LED curing applications are broad, all major areas are involved
According to industry research, UV-LEDs have maintained explosive growth in the past 78 years, with a compound annual growth rate as high as 28.5%. Especially in 2016, various application technologies such as light curing, sterilization and purification markets have gradually matured. The UV-LED market has become the new blue ocean in the LED industry. So, in which application areas UV-LED will show its talents?
First of all, we need to understand the scope of the UV spectrum, because the light source of each band has a unique property, can be manufactured into different LED packaging products.
UVA band, wavelength 320-420nm, known as long-wave dark spot effect UV, it has a strong penetration rate.
UVB wavelength, wavelength of 275 ~ 320nm, known as the medium wave erythema UV, medium penetration.
UVC band, wavelength 200 ~ 275nm, called short-wave sterilization UV, its penetration ability is the weakest.
UVD band, wavelength 100 ~ 200nm, also known as vacuum ultraviolet light.
The above two products have the following outstanding features:
1. All use of gold-plated ceramic substrate, the product has strong anti-aging properties, there is no need to worry about the blackening of the product.
2. Product light angle can provide 120 ° / 60 ° two options.
3. Two-way Zener Diodes provide the best electrostatic defense capabilities.
4. High radiant flux: 700mA can provide more than 1000mW of ultraviolet radiation flux.
5. Wavelength: Provides various standard wavelengths of 365/385/395/405 nm.
6. A wide range of applications: UV printing, UV exposure, UV curing, UV anti-counterfeiting, UV mosquito lamp nail lights and so on.
From the above two products, we can get a glimpse of the huge industrial value and application value of UV-LED. It has good performance in the fields of printing, exposure, anti-counterfeit, and curing. In the future, we will witness the application of UV-LED to a wider range. field.
Of course, the UV-LED curing machine can provide the same UV light as the mercury lamp. It also has the advantages of long life, no heat radiation, low power consumption, low use cost, precise and adjustable power, small size, and the shape of the light source can be customized. The features have been successfully applied in many industrial assembly fields:
Manufacturing of electronic components such as LCD manufacturing, camera and other optical products manufacturing, optical disc manufacturing, watch manufacturing, buzzer, assembly of mobile phone keys, manufacture of electronic circuit boards, manufacture of polarizing components, assembly of micro motors, etc.; The application of UV-LED UV curing machines in civil applications is also gradually developing:
In the field of daily necessities, it is mainly used in the manufacture of housewares, furniture production, toy production, glass processing, assembly of glass arts and crafts, assembly of jewelry, decoration, positioning, and printing fields.
3, UV-LED point light source and line light source are facing challenges and bright prospects
One of the first applications for UV-LEDs to be accepted and popular is point sources.
UV-LED light emitting unit is only a few millimeters in size, luminous body is mostly square with side length of 1mm, and the light emitting point is small, which is very suitable for achieving good light collection effect through the light path system and realizing small spot high-intensity ultraviolet irradiation.
Spotlights are suitable for spot curing applications where the cured area is only a few millimeters and require high UV intensity, such as laser heads, fiber optic connectors, fiber couplers, LCDs, OLEDs, hard disks, smart cards, sensors, micro motors, Encoder manufacturing, solder joint reinforcement and so on.
Most of the light emitted by the UV-LED line light source is a narrow and slender linear light. A special light path system needs to be designed to converge a plurality of light spots emitted by a row of UV-LEDs into a narrow, uniform, and high-intensity linear light.
UV-LEDs have many advantages, but there are still many places that restrict the popularization of UV-LEDs. The current UV-LED line light sources have high costs, low single power, complex optical systems, narrow wave peaks, poor matching of photoinitiators, etc. problem.
Cost and luminous intensity are the main aspects restricting the popularization and application of UV-LEDs. The development and design ideas of line light sources should follow the following points:
The light path system is the key, and a good light path system should be energy concentrated and uniform, thereby reducing the deformation of the solidified workpiece and reducing the curing stress and improving the curing accuracy; the high irradiation intensity makes the curing more efficient; the special shape line light source has more Adaptability to meet the needs of more workstations, making its application more popular; more energy-efficient and environmentally friendly and lower cost.
a) The UV-LED line light source cooperates with the dispensing machine to realize the rapid sealing and running of the chip. Due to the high UV-LED energy, stable light output and uniform illumination, the production is more efficient and efficient.
b) Because UV-LED is a cold light source, no heat radiation, small temperature rise, to meet the requirements of liquid crystal display production conditions, liquid crystal display by UV-LED line light source during LCD manufacturing process, and FPC and LCD connection Cable reinforcement is simple, fast and efficient.
c) The use of UV-LED line light sources with UV inks can be used in the printing industry.
d) Syringe needle manufacturing.
e) Headphones, Mike manufacturing.
f) Sensor package.
4, surface light source cost is high and development is limited
UV-LED surface light source also has no heat radiation, curing oven temperature can be controlled at room temperature; many LED light emitting points are evenly distributed, many groups of professional lens groups optimized for ultraviolet irradiation, the irradiation uniformity is good, the irradiation intensity of the edge and the center is consistent Excellent sex. And can customize the shape and size of the light emitting area according to the user's needs.
In the case of the same input power, the UV-LED surface light source is more expensive than the mercury lamp; according to the output power, the cost is higher than the mercury lamp.
At present, the main breakthrough of UV-LED surface light source application and popularization is in small surface light sources. Now the intensity of irradiation of small surface light sources can reach several hundred to one thousand milliwatts per square centimeter or more, and high irradiation intensity leads to higher production efficiency; On the one hand, the small surface light source has concentrated energy and no heat radiation, so its heat dissipation system and the entire irradiation system tend to be miniaturized, and the application is more convenient.
Compared with point light sources and line light sources, the cost of surface light sources is high, which restricts the application and development of surface light sources.
5, Wide application of UV-LED will meet the needs of various fields in society
As the cost of UV-LEDs continues to decrease, the popularity of UV-LEDs is shifting from point sources to line sources (the popularity of surface light sources will take some time), and in the field of industrial assembly and daily necessities, line light sources will receive More applications. The development trend of line light sources is refinement, that is, various classifications occur depending on the occasion (wavelength, shape of the irradiated area, irradiation intensity, etc.) to meet the requirements of different working conditions.
At the same time, on the one hand, with the adaptive development of UV-LEDs by photoinitiators, the application of UV-LEDs will be more extensive, the advantages will become more and more obvious, and the layout of enterprises in this subdivided area will be inevitable. Row. On the other hand, the country has always advocated energy conservation and environmental protection, provided various benefits for new energy-related industries, and encouraged high-tech companies to innovate boldly. UV-LEDs are maturing, companies have the responsibility and obligation to provoke the heavy responsibility of UV-LED development, and strive to create value for the community.
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