The four hottest R & D achievements promote the de

2022-07-25
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Four kinds of R & D achievements promote the development of LED lighting technology

continuous scientific research is the only way to promote the innovative application of LED lighting technology and better benefit the people. Therefore, many domestic and foreign scientific researchers devote themselves to it tirelessly

I. removing the blue color from LED lights may reduce harmful effects

according to foreign media reports, a lighting technology company named circadian light claims that removing the bioactive blue wavelength from white LED lights may reduce some harmful effects, such as biological clock disorders, increased appetite, insulin resistance and the risk of diabetes. It is reported that the company recently conducted a study to make a comparison among a group of healthy workers who worked 12 hour night shifts under traditional LED lights and circadian light lights respectively. According to the fact that the standard tensile sample is in the tensile state, this lamp can adjust the content of bioactive blue in the lamp according to the position and season and the 24-hour system

martin Moore EDE, MD, President of circadian light, said at the press conference that the preliminary results showed that removing the blue LED light at night minimized the imbalance of the biological clock, and also prevented the increase of appetite and insulin resistance. These harmful phenomena occurred in the research subjects exposed to the traditional LED light. According to the draft, circadian light's rhythm LED lamp keeps the quality of white light while removing the blue wavelength

II. "Light pollution" of LED street lamps may lead to plant production reduction

it is reported that the rapid growth of global artificial light sources has been proposed as a new threat to the terrestrial ecosystem. A new study shows that street lamps that bring great convenience to people's nightlife may cause great damage to crops and plants. Because the "light pollution" at night will interfere with pollinators (distract the attention of insect vectors). However, this part of pollination loss at night cannot be compensated by day. At present, the global research on the sharp decline in the number of pollinators mostly focuses on diurnal species (such as bees), but few people deeply study nocturnal pollinators (such as some moths and beetles) until this new research report was published in the journal Nature Ecology. According to the report, the scientists set up street lights on seven lawns that had never been equipped with artificial light sources before. As a reference, there are seven other lawns without lights. The results showed that the pollinators of the former visited fewer times and the plants produced fewer fruits. The co-author of the paper, an ecologist at the University of Bern in Switzerland, said that artificial light sources at night are increasing at an average annual rate of 6%, which obviously has had a certain impact on animals. Generally speaking, plants are pollinated by insects during the day and at night. Nocturnal pollinators are usually attracted by taste, but other factors are also important, such as visual stimulation. Nocturnal insects' eyes are usually sensitive to light. Therefore, they may be blinded and disoriented by artificial light sources at night; Others may be attracted by light, dispersing their natural habitat

for this study, knop team found 14 different grasslands in the country, half of which were equipped with LED street lights that are common in Europe and can be automatically lit at dusk. They first studied how light affected pollinators (to see if they visited the grass), so they marked out a specific area on the grass. The researchers collected all the insects that touched the flowers, counted and recorded the number of these pollinators in each sample area. After repeated on all grasslands (day and night), they found that the number of night pollinators decreased sharply by 62% in the grassland with lights. As a result, the number of plant fruits also decreased dramatically. Fruit grows from flowers, but not every flower forms fruit. Many signs point out that insect pollination is the most important factor in the process of flower growing into fruit. However, the study is also limited. At present, it only looks at one habitat: grassland. Researchers have not been able to clearly show the exact harm of nighttime light sources to crops. To be sure, lighting can guarantee the safety at night, but it is also harmful. The researchers recommend avoiding the use of light sources that are harmful to insects. Another option is to use induction lights that only turn on when someone is nearby, which will be good for the earth's ecology

III. new additives can make perovskite led more stable and efficient

in the recently published journal Nature photonics, researchers at Princeton University in the United States published a paper saying that a new technology has been developed to manufacture perovskite led with lower cost, higher efficiency and more stable performance by adding organic ammonium halide. In the past 10 years (unit: the Provincial Department of economy and information technology and the Provincial Department of construction), LED has been more and more widely used. However, reducing the manufacturing cost of LED is an important goal for the relevant industries. It is reported that perovskite is an ancient material, which was first discovered in the Ural Mountains of Russia in 1839, and is named after Russian mineralogist Lev polovsky (perovskite is the English name of perovskite). This kind of material is mostly cube or octahedron, which has unique properties. It can be either a semiconductor or a superconductor, depending on its structure. As a new functional material, perovskite has great development potential in the fields of environmental protection and industrial catalysis. In recent years, it has received continuous attention due to its application in the field of solar cells In fact, organic-inorganic hybrid perovskite materials are also regarded by many scientists as substitutes for gallium nitride and other LED preparation materials. However, the low film-forming efficiency and low stability restrict their application in the LED field. The new technology developed by Princeton University researchers solves this problem. They said in their paper that when making perovskite films, adding organic ammonium halide, especially long-chain organic ammonium halide, to the perovskite solution will make the perovskite crystal particles much smaller, and the perovskite films will be thinner and smoother. Such Perovskite Thin Films mean that good external quantum efficiency such as "constant stress (n/min)" of the specified experimental force is increased within 1 minute, which will make the led more efficient and more stable. Compared with silicon and other LED preparation materials, perovskite is cheaper and the preparation process is simpler. The researchers said that the new technology will accelerate the commercial application of perovskite in the fields of lighting, display and laser, and make the future LED products more efficient and cheap

IV. the brightness of the brightest bulb can be more than 1billion times stronger than the surface of the sun

according to foreign media reports, a team of scientists at the University of Nebraska Lincoln in the United States plans to produce the world's brightest bulb, which can emit light beams up to 1billion times stronger than the surface of the sun. Researchers believe that this unimaginable extremely bright lamp can be used as a new type of X-ray, It can take clear photos with higher resolution than traditional ones. Traditionally, an electron can only emit one photon at a time. However, the bulb being developed by the "extreme light laboratory" of the university can emit nearly a thousand photons per beam, which is thousands of times that of the traditional bulb. The light beam emitted by this extremely bright bulb can help the human naked eye see more details of objects, and will effectively help the medical staff, engineers and various scientific experts in the practical application and improve the safety

it is pointed out that this unimaginable light bulb will basically change what we can see in the future. The light beam it emits will make it difficult for every detail to escape the human eye. Therefore, when you turn on this light, you will find that everything you saw in the past has become different. It is no longer the world you saw and experienced in the past. The extremely bright light beam will change the appearance of the object, and every tiny detail will be clearly visible. Researchers believe that this can solve the problem that traditional X-rays cannot see tiny tumors or cracks. It can also be used in "overspeed cameras" to capture the transformation process of chemical reactions and the process of electron movement. In fact, this kind of research has been tried for many years in the past, but failed because it could not find a bright enough light source

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