Lighting materials can be used in sidewalks, streets and buildings. No gold, silver, or other precious metals were obtained as he had hoped. But after the stone had cooled, Casciarulo discovered something interesting: if he exposed it to sunlight and then took it into a dark room, the stone would shine. p>
"Paulownia stone" was the first synthetic material to glow continuously. More cases were to be followed - and today, static luminous materials are used for decoration, emergency lighting, sidewalk signs, and medical imaging. p>
One day it might give us brighter cities, stay cooler and use less electricity.
A new generation of luminescent materials has the ability to cool cities by redistributing light, which would otherwise convert it into heat. It may also reduce energy consumption, as bright sidewalks, glowing road signs or even incandescent buildings can replace some street lighting. Currently, some cities in Europe have installed glowing bike lanes, and some researchers have studied the use of bright colors for road markings. ( To animate this GIF, zoom in.) “Src="https://safirsoft.com/picsbody/2111/12133-1.jpg"alt="https://safirsoft.com Will glowing material light up our cities someday?" srcset="https://cdn.arstechnica .net/wp-content/uploads/2021/11/glow-in-dark-cities-1600x600-1280x720.gif 2x"> The Van Gogh bike path in Eindhoven painted by the artist was zoomed in overnight. Glow-in-the-dark paths and similar roads could eventually provide energy for lighting and cooling cities. (Enlarge the animated GIF.) "It's better for the environment," says Paul Bradal, an environmental physicist who is now retired from Lawrence Berkeley National Laboratory in Berkeley, California. "If the technology can be improved, we can use less energy...it is worth it." Bologna, a form of the mineral barite, fascinated the natural philosophers of the time, but it was not particularly useful. But in the 1990s, chemists developed new types of sustainable photoluminescence materials, such as strontium aluminate, that retained strong light for hours after exposure to light. Most of these new materials glow blue or green, although some glow yellow, red, or orange. p> It does. This energy is light of lower wavelengths. Sometimes light is emitted instantly, like a fluorescent lamp. Other substances, consistently called luminescence, store energy longer and emit more slowly. p> Zoom/More than 250 types of brilliant material identified. Compiled above with a) small materials that serve as a luminescence center. b) host composition; c) color glowing brightly for hours, these materials open up opportunities, such as "glow-in-the-dark" cities illuminated by cobblestones and glowing buildings. "Because construction engineer Anna Laura Becilo and colleagues write in the 2021 Annual Survey of Materials Research, 19% of the total global energy consumption is for lighting and in Europe about 1.6% is for street lighting, the potential energy savings is high.”
One of the problems with this approach is that most luminaires do not glow all night long. Becilo of the University of Perugia says, who studies energy-saving building materials: “Better materials can help solve this problem.” In the meantime, the available materials can be combined with bright electric lighting with a staircase Sufficient to recharge road signs before shutdown. p>
Bright colors can also provide outdoor lighting. Pisello Labs has created such a vivid color in the dark, and in a 2019 report, they simulated what would happen if a public road near a railway station was painted with it. Scientists found that glow during the night reduces the color energy required for lighting by about 27 percent in the vicinity. p>
If this is causing concern in all cities staring at night and adding harmful light. Beslow says contamination is unlikely. Luminous materials are more likely to replace, not add to, existing lighting. The color of the glowing material can be chosen to block out blue frequencies that are particularly harmful to wildlife, and the glowing material can also help combat what are known as urban heat island effects. Roofs and sidewalks absorb energy from the sun and emit it in the form of heat, with average summer temperatures 7.7°C higher than the surrounding countryside. Higher temperatures are a potential health hazard and also result in more energy being used to cool buildings. p> Advertising
A common solution is to use "cool" materials that reflect light, such as white and light. Is. It has been proven that colored asphalt adds more luminous materials. p> Anna tries Laura Pisello and her colleagues at the University of Perugia create practical glow-in-the-dark pavements They are experimenting with different luminescent materials and testing how to add them to paving materials for optimum performance and durability. Above are examples of glossy materials and built-in paving stones Anna Laura Pisello
at Lawrence Berkeley Lab Bradal and his team conducted experiments using synthetic sapphire, a substance that glows in the sun, to create the color Coatings That Remain Cool In a preliminary experiment, they reported that the surface of a sapphire dye in the sun remained cooler than a similar dye without a particular pigment, and was added to it constantly. photovoltaic and gently pour it into the concrete.Compared with non-glare surfaces of the same color, the best one reduces the ambient temperature to 3.3 °C on sunny days.
"You can reverse [the surface] as much as possible. Patrick “But can you go further?” says Phelan, a mechanical engineer in Arizona. There are 250 known bright materials, many of which have yet to be studied for practical applications, and there is potential for bright colors and pavements that finally, the university wrote in an article on the impact of urban heat on annual environmental surveys and resources. "In the short term, the best and easiest way is to improve what we have now. It involves optimizing the materials so that they reflect light," he says. Longer, stronger, or in different colors and make sure they continue to work in real environments. p>
He adds that there are new classes in the long run. Engineered materials can do better. For example, we can turn to 'quantum dots' - tiny, glowing semiconductor particles that have already been used in biological imaging - or perovskite, materials used in solar cells that are also being studied for their luminosity properties. Kurt Kleiner is a freelance science journalist in Toronto. p>
This story was originally published in Knowable magazine.
Will glow-in-the-dark materials someday light up our cities?
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