Lin Jizhi, vice president of research and development of Hengri Optoelectronics, said that Hengri Optoelectronics has invested a lot of manpower and research and development costs with its own material development technology to solve the problem of lowering the efficiency of silver plating vulcanization and oxidation. A special light extraction layer is provided between the lead frame and the vulcanization phenomenon is prevented, thereby suppressing the decrease in color rendering. Certified by the IST laboratory (test conditions: temperature 50 ℃, humidity 75% (RH), H2S = 3ppm, 168hr) confirmed that there is no sulfidation reaction, which can completely avoid the lightening and color rendering of the stent blackening. The problem of decline.
In the current environment, due to the development of industry and the increase in the number of steam locomotives, the exhaust gas of industry and steam locomotives is flooding the environment. Among them, automobile exhaust is a very complicated substance, which has many harmful costs, such as: solid suspended particles, unburned or incompletely burned hydrocarbons (HC), nitrogen oxides (NOx), carbon dioxide (CO2), Carbon monoxide (CO), sulfur dioxide (SO2), hydrogen sulfide (H2S), and traces of phenol, aldehydes, peroxides, organic acids, and lead and phosphorus pollution caused by lead and phosphorus gasoline.
At present, a large number of silver-plated brackets are used for LEDs. The silver-plated layer on the bracket usually reacts (sulfurizes) with hydrogen sulfide in the air that penetrates through the sealing material and becomes black, resulting in a gradual decline in efficiency and color rendering.
4Ag + 2H2S + O2? 2Ag2S + 2H2O
The use environment of high-power LED lights is also the environment with the most exhaust gas of auto locomotives, such as street lights, flood lights, tunnel lights, etc. In these environments, the content of sulfide is relatively higher than that of indoors. Therefore, LEDs used in these environments often face the problem of excessively low efficiency, resulting in inconsistent quality assurance.
It can be clearly seen from the above table that under the test of long-term lighting using the silver-plated bracket, the silver-plated layer will be affected by hydrogen sulfide and the silver sulfide will gradually become black. At the same time, the light effect and color rendering Both are affected at the same time and gradually reduced, which is the most difficult problem for high-power LEDs to overcome in outdoor environments. Silver is currently the best light extraction material. Among the currently known metal materials, silver has the best reflectivity for each wave band. If no silver plating is used, the light extraction efficiency of LED will drop by 10-20% at different color temperatures. Therefore, the use of a silver-plated layer can make the initial light efficiency of the LED high, but the light effect will be seriously affected by the external environment due to the blackening of the silver layer for a long time, and the light attenuation will be serious. The light extraction efficiency and maintainability have always been problems that fish and bear's paws can't have together. This is a problem that the LED industry is eager to solve.
Lin Jizhi, vice president of research and development of Hengri Optoelectronics, said that Hengri Optoelectronics has invested a lot of manpower and research and development costs with its own material development technology to solve the problem of lowering the efficiency of silver plating vulcanization and oxidation. A special light extraction layer is provided between the lead frame and the vulcanization phenomenon is prevented, thereby suppressing the decrease in color rendering. Certified by the IST laboratory (test conditions: temperature 50 ℃, humidity 75% (RH), H2S = 3ppm, 168hr) confirmed that there is no sulfidation reaction, which can completely avoid the lightening and color rendering of the stent blackening. The problem of decline. Reaching the realm of low light decay and high reflectance, the performance of light effects at various color temperatures is not inferior to that of silver or even higher than the reflectivity of silver, so that LEDs can truly meet the needs of energy efficiency and green energy with high efficiency, low light decay. At present, Lightan®Ⅲ COB integrated light source has fully applied this latest technology. Hengri Optoelectronics hopes to provide a high-quality and stable integrated light source for the high-power lighting industry as its mission.
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