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Recently, research papers published in the "Scientific Report" journal by Northeastern University in Japan showed that scientists have found a new direction of use of blue LEDs. When the blue LED is at the correct firing frequency, it evolves into an effective, convenient, natural and harmless new insecticide. For the first time, researchers found that visible light in the blue region of the spectrum is a deadly weapon to kill mosquitoes and other pests such as fruit flies.
In 2014, Japanese scientist Akazaki, Amano Akira and Japanese-American scientist Nakamura won the Nobel Prize in physics for his outstanding contributions to the research of blue LED. This event has greatly encouraged Japanese scientists to continue to struggle for the lives of people in their own research fields. In the case of blue LEDs, although the public is unfamiliar with the term, it does change the way millions of households shine.
Recently, research papers published in the "Scientific Report" journal by Northeastern University in Japan showed that scientists have found a new direction of use of blue LEDs. When the blue LED is at the correct firing frequency, it evolves into an effective, convenient, natural and harmless new insecticide. For the first time, researchers found that visible light in the blue region of the spectrum is a deadly weapon to kill mosquitoes and other pests such as fruit flies.
1. Different color light sources have different insecticidal effects
Northeastern University's research team consists of four scientists who form an experimental group. Three types of insects, including fruit flies, mosquitoes, and flour beetles, are used as experimental subjects to complete experiments on the effects of light sources on insects. In the growth of the three types of insects from young eggs to adults, the researchers irradiated them at different angles with different intensity of colored light. The experimental results are very interesting. Scientists discovered that when light changes from ultraviolet light (378 nanometers) to visible blue light (508 nanometers), insects cannot escape their annihilation. However, red light and yellow light basically do no harm to insects.
2. According to insect species symptomatic "light"
More interestingly, the wavelength of light is not exactly the same as its insecticidal effect. For example, a light of about 467 nanometers kills fruit flies more than any other wavelength of light; and a 417 nanometer light source has an excellent ability to kill mosquitoes. This means that each insect has its unique "lethal wavelength", which of course is closely related to their living habits. Mosquitoes are accustomed to flying under strong sunlight, and can effectively resist most of the light sources. However, high-intensity ultraviolet radiation is their death knell. The flour beetles live in a dark environment and they become very fragile during light changes from 404 nm to 467 nm. From this point of view, we must prescribe the right medicine for these insects.
3. How does a blue LED work?
So naturally we can't wait to know what it is. Although a series of experiments is beyond the scope of ordinary people's understanding, scholars at Northeastern University believe that the principle of blue LED in terms of insecticidal effect is basically the same as that of ultraviolet radiation that can destroy cells. Scientists say that specific wavelengths of blue light and ultraviolet light can effectively promote the formation of a molecule called reactive oxygen species (ROS) when they irradiate insects. Reactive oxygen species will destroy large areas of insect cells and ultimately cause death. Although people are not yet aware of how to use blue LEDs to make the right insecticide, at least we can be sure that the light has a significant effect on disinfestation. If we can further study, science may benefit people in a healthy, harmless, and cost-effective way in food cultivation and disease control.
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