Views: 0 Author: Site Editor Publish Time: 2022-11-09 Origin: Site
A powerful LED can effectively disinfect the surface and keep people safely. Physicists of the Institute of Physics and Chemistry have designed an efficient LED, which is fatal for microorganisms and viruses, but it is safe to humans. One day, it can help countries go out of the shadow of major epidemic diseases by killing pathogens in the room full of people.
Most LEDs emit visible light, but the physicists of the Institute of Physics and Chemistry created an LED that emits light in a narrow area of far ultraviolet light, which is safe for humans, but fatal to viruses and bacteria
Ultraviolet germicidal lamp is extremely effective for killing bacteria and viruses. In fact, they are often used in hospitals to disinfect surfaces and medical instruments. This type of lamp can be built with LEDs to make it energy efficient. However, the ultraviolet light produced by these LEDs can damage DNA within a certain range, so they cannot be used around people. People are looking for the development of efficient LED, which emits light in a narrow far ultraviolet light band. It seems that it can not only disinfect well, but also be safe for people.
In order to solve this problem, three physicists Masafumi Jo (Dingchang Shi), Yuri Itokazu (Shishu Xiongli) and Hideki Hirayama (Hideki Hirayama) in the Quantum Optical Device Laboratory of the Institute of Physics and Chemistry created a LED with more complex design. They clamp multiple layers of aluminum together, and the proportion of each layer of aluminum is slightly different. In addition, in some layers, they also added trace amounts of silicon or magnesium.
This effectively creates an obstacle for electrons, hindering their movement on the material, and detaining them in some areas for longer periods. This causes the amount of light emitted by the device to increase and the amount of light absorbed to decrease.
The team used computer simulations to simulate all possible impacts to help determine the ideal design Precise control of the thickness of each layer is the biggest experimental challenge. They finally got an LED that works under far ultraviolet light, and its output power is almost ten times higher than their previous best value.
The COVID-19 pandemic has brought about a new awareness of the importance of being able to eradicate viruses and microorganisms on the surface. " Ding Changshi said, "We believe that our findings and technology will be very useful to protect society from the impact of this and future pandemics."
He added that the three person team will work hard to further improve the performance of their LED, and there is still much room for improvement in the output power and power efficiency of this product.
