Green environmental protection is the mission of LED light source
Vulcanization is a "cancer" of LED devices . The industry has been working hard to improve its ability to resist vulcanization in order to achieve higher reliability, reliability and further increase the life of light sources. Recently, Flory Optoelectronics (Suzhou) Co., Ltd. successfully developed a high-anti-vulcanization LED aqueous coating technology (Figure 1). Comparative vulcanization experiments show that light decay is less than 2% (at 170 °C vulcanization conditions), far superior to devices without aqueous coatings (9.56% for light decay) and devices from other suppliers in the industry (light decay 31.74%).
| figure 1. Â Environmentally friendly, high anti-vulcanization performance of LED aqueous coating technology: accelerated vulcanization test results (condition: sulfur powder 80 degrees 8 hours; comparative experiment). The methyl silica gel encapsulated LED stent (left 2) treated with C15-01 aqueous solution showed superiority to other stents (left three: methyl silicone stent treated with organic solution coating; right second: no Coating treated methyl silica scaffold; right one: uncoated phenyl silica scaffold). |
As the fourth-generation light source, LED has the characteristics of energy saving (close to 60% electro-optical conversion efficiency), environmental protection (LED is composed of non-toxic materials), safety, long life (the theoretical value can reach 100,000 hours), etc. Widely used in various fields such as indication, display, decoration, backlight, lighting, etc. Compared with incandescent lamps (about 10% electro-optical conversion efficiency, 1000 hours life), fluorescent lamps (about 30% electro-optical conversion efficiency, harmful and environmentally harmful elements such as mercury, about 3.5-5mg / only), led light source The advantages of energy saving and green environmental protection are particularly prominent.
In order to further enhance the environmental protection advantages of the semiconductor and LED industries , many companies and institutions have invested heavily in the improvement of materials and processes in order to achieve more beneficial effects on human health and environmental protection. The EU took the lead in enacting legislation and implementing the mandatory standard RoHS, the full name of the Restriction of Hazardous Substances, which is mainly used to regulate the materials and processes of electrical and electronic products. standard.
Effect of vulcanization on LED
A silver plating layer is often used in the holder of the LED device to increase the light extraction rate. However, in the daily use of the LED light source, small molecules containing sulfur in the environment will penetrate into the inside of the stent under a certain temperature and humidity, and chemically react with silver to cause vulcanization. After the vulcanization phenomenon occurs, the LED function area will be blackened, the luminous flux will gradually decrease, the color temperature will obviously drift, and some will have leakage phenomenon, and more serious dead lights will appear. Therefore, the LED industry has been working hard to improve the resistance of the device to vulcanization. In addition to improving the vulcanization resistance of phenyl silica gel, Japanese international companies have also introduced anti-vulcanization coatings based on organic solutions. Although its anti-vulcanization performance is excellent, since the organic solvent content exceeds 95%, it is necessary to consider fireproofing, explosion-proof, human hazard and environmental impact during use.
Flory's C15-01 aqueous solution LED anti-vulcanization coating
Adhering to the "green to good" research and development and production purposes, Flory Optoelectronics has been committed to the development of green and environmentally friendly optoelectronic packaging materials since its inception. Recently, Flory Optoelectronics (Suzhou) Co., Ltd. successfully developed a high-anti-vulcanization LED aqueous coating technology (Figure 1 and Figure 2). “After a large number of tests, Flory has independently developed environmentally friendly, high-sulfur-resistant LED aqueous coatings, which currently exhibit excellent anti-vulcanization properties on SMD devices and are certified and in production in LED packaging companies. Trial production." Dr. Zhang Yuzhi, general manager of Flory Optoelectronics (Suzhou) Co., Ltd., excitedly told reporters that C15-01 is a non-volatile polymer coating based on silicon. More than 95% of the ingredients are water. C15-01 is not only an environmentally friendly, green aqueous coating, but also exhibits better resistance to vulcanization than organic solution coatings in many tests. “Green Goodness is the thinking guide for Flory's R&D and innovation. The C15-01 aqueous solution anti-vulcanization coating not only significantly improves the anti-vulcanization performance of the LED, but also improves the adhesion of the silicone and the stent. We are currently improving this. Technology for application to COB devices." Dr. Zhang introduced.
figure 2. Â Environmentally friendly, high anti-vulcanization LED aqueous coating technology: C15-01 aqueous coating treatment process.
Mr. Wu Gan, Chairman of Zhongshan Bingyi Electronic Technology Co., Ltd. (formerly Director of Guangzhou Hongli Optoelectronics Co., Ltd. and Executive Deputy Director of Technology Center) spoke highly of this technological breakthrough and considered this aqueous coating to “focus on SMD LED devicesâ€. The successful application of a backlighting leader in R&D has significantly improved the anti-vulcanization capability of backlight LED devices (Figure 3), further consolidating the company's leading position in technology. Chairman Wu very much appreciates that Flory Optoelectronics (Suzhou) Co., Ltd. has been insisting on technology and material innovation since its establishment, and believes that Dr. Zhang has successfully advanced materials in the United States for nearly two decades (semiconductor packaging materials and chip manufacturing electronic chemicals). The introduction of R&D experience and team management experience to Flory Optoelectronics is a rare and innovative new material company in China.
| image 3. Â A backlight leader focused on SMD LED device development successfully introduced the C15-01 anti-vulcanization aqueous coating into its SMD production with special requirements. The SMD LED device treated by C15-01 exhibits excellent resistance to vulcanization. Under 170 degrees vulcanization, the light decay is less than 2%, which is far superior to the device without aqueous coating (light decay 9.56%). And devices from other suppliers in the industry (light decay 31.74%). |
The reporter also learned that Flory Optoelectronics has developed a variety of LED silicone packaging materials through independent research and development, including ordinary refractive index LED silicone packaging adhesive A series, high refractive index LED silicone packaging adhesive H series, UV resistant UV- LED silicone encapsulant U series, led filament adhesive F series, water-soluble anti-vulcanization coating C series for LED packaging, WP series and film PF series for CSP LED packaging, and nano transparent UV adhesive EN series for IC card packaging. Its excellent performance and quality have been warmly welcomed by customers and become a popular sales product. It has applied for and authorized a number of Chinese patents and trademarks. In the subsequent reports, Florian Optoelectronics (Suzhou) Co., Ltd. will continue to introduce other photovoltaic material improvement achievements and disruptive innovation technologies.
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