Latest news with #UniversityofScienceandTechnologyofChina
Yahoo
5 days ago
- Science
- Yahoo
China's innovative perovskite film boosts LED brightness, extends lifespan
Perovskite, a high-performance material known for its luminous efficiency, low cost, and processing flexibility—with broad potential in solar cells, LEDs, and photodetectors—has traditionally faced a major challenge: inefficient recombination of electrons and holes, the charge carriers responsible for light emission. Now, Chinese researchers are claiming to have achieved a major breakthrough in this regard. Led by Professor Xiao Zhengguo, a research team at the University of Science and Technology of China in Hefei has developed a novel method for fabricating all-inorganic perovskite films with larger crystal grains and improved heat resistance, paving the way for more durable and efficient perovskite LEDs. According to Xiao, the innovation boosted LED brightness to 1.16 million nits and extended the operational lifespan beyond 180,000 hours—overcoming a long-standing bottleneck that prevented perovskite LEDs from achieving both high efficiency and stability, and opening the door for their potential use in advanced displays and ultra-high-brightness lighting, state-owned news agency Xinhua reported. To enhance luminous efficiency, earlier efforts focused on creating ultra-small nanoparticles or extremely thin material layers. However, this approach came with major limitations—LEDs produced with these methods struggled to reach high brightness and often had lifespans of just a few hours, making them unsuitable for real-world applications. Rather than relying on conventional approaches, the research team took a fundamentally different path to overcome the limitations of previous perovskite materials. By carefully introducing specially selected compounds into the perovskite composition and subjecting the material to a high-temperature annealing process, scientists were able to engineer a new type of perovskite film. This advanced film features much larger crystal grains, which help facilitate better charge transport, and a substantially reduced number of defects, both of which are critical factors in enhancing the overall performance, stability, and longevity of perovskite LEDs. Xiao explained that the novel perovskite material's enhanced internal structural order is crucial for significantly improving both the brightness and stability of the LEDs. The research also showed that the luminous efficiency of this new perovskite LED surpassed 22%, putting it on par with existing commercial display products and signaling a major advancement in LED technology. In comparison with typical commercial OLED and LED screens currently available, the new perovskite LED achieves a notably high brightness of over a million nits. This level of brightness could make it well-suited for applications requiring strong visibility, such as outdoor displays and specialized lighting. Typically, everyday displays reach peak brightness levels of just a few thousand nits. When operating at a more common brightness level of 100 nits, the new perovskite LED demonstrates a theoretical lifespan of close to 200,000 hours—well within the range needed to meet commercial LED product standards. As noted by the scientific team, this extended durability not only ensures long-term reliability of their innovation, but also highlights the material's potential for practical, everyday use in a variety of display and lighting applications.
South China Morning Post
6 days ago
- Science
- South China Morning Post
Light fantastic: China unlocks lifespan potential of next-gen LED
Scientists in China have unlocked the potential of a radical new type of LED technology that could potentially revolutionise a key component of today's electronic devices, making them highly energy efficient, more luminous – and possibly cheaper. Advertisement Until now, widespread commercial adoption of the perovskite light-emitting diode (PeLED) has been hindered by one major roadblock: it tends to be unstable, leading to a short lifespan. But this week, researchers published a study that showed how the lifespan of a PeLED could be extended to more than 20 years at a comparable brightness to commercial displays. The best PeLEDs currently last for an average of a few thousand hours. 'Our work is a new approach for designing efficient, bright and stable PeLEDs for real applications,' the team from the University of Science and Technology of China, Fudan University, and Nanjing Tech University said in a paper published in the peer-reviewed journal Nature on Wednesday. Using an alternative method to prepare perovskite – a class of photosensitive semiconducting materials – the team's PeLEDs reached a brightness of 1.16 million nits, far exceeding the brightest commercial display screens, which usually cap out at several thousand nits. Nits are a unit of measurement used to quantify the brightness of electronic displays. Advertisement When operating at 100 nits, which meets the standard of some commercial LED products, the team's new PeLEDs had a theoretical lifespan of more than 185,000 hours, or around 21 years. PeLEDs that are both durable and efficient could be used in commercial applications to create low-cost, ultra-bright lighting and high-end display screens.
BBC News
04-06-2025
- Health
- BBC News
Scientists create contact lenses that can help us see in the dark
A team of scientists from China have created contact lenses that can help people to see in the new lenses allow people to see infrared light, which is normally invisible to the human technology has been around for a while, in the form of things like night-vision goggles, however, these are quite heavy and need power to Tian Xue, a scientist at the University of Science and Technology of China, said their work could help to inspire a range of contact lenses, glasses and other wearable devices that give people "super-vision", as well as helping people with optical conditions like colour blindness. Why can we see some things and not others? There are seven types of electromagnetic (EM) waves, made of light, sound and radiation, which are part of something called the Electromagnetic can only see 'visible light', but there are lots of other types like radio waves, ultraviolet light and infrared light, which we cannot scientists have developed technology like sonar which helps us to see sound, and night-vision cameras which help us to see infrared light using temperature. How do the infrared contact lenses work? The team of scientists created contact lenses that have engineered nanoparticles in are tiny microscopic structures that are made up of a few engineered nanoparticles absorb and change near infrared light into blue, green and red light, which is visible to the human experiments to test out the lenses, people said they could see signals flashed from an infrared light, and could tell what direction the light came well as this, people said their infrared vision improved when they closed their could be because our eyelids help to block visible light more than infrared, so there was less visible light to the scientists have said that the lenses are not quite sensitive enough to see low levels of infrared light, so they do not give complete thermal vision yet, but the team hope that future work can help to improve the technology.
Time of India
30-05-2025
- Science
- Time of India
China develops laser telescope that can see objects as wide as a matchstick head from over a kilometre away
Chinese researchers have developed a laser system that can detect tiny text and fine details from a distance of 1.36 kilometres, a new study published in Physical Review Letters has revealed. The team from the University of Science and Technology of China tested a laser-based method that achieved a 14-fold improvement in resolution compared to traditional optical imaging using a single telescope. New method focuses on light patterns, not image clarity Instead of focusing directly on capturing an image, the team used a technique called active intensity interferometry. This method is based on how light interacts with a surface rather than what the object looks like. Unlike traditional telescopes that rely on self-luminous sources like stars, this system can detect non-luminous objects. Infrared lasers and dual telescopes power the system According to Science Alert, the system emits eight infrared laser beams across a specific point. Two telescopes capture the intensity of the reflected light. By comparing the signals from the telescopes and calibrating the laser beams, researchers were able to reconstruct an image of the target. Play Video Pause Skip Backward Skip Forward Unmute Current Time 0:00 / Duration 0:00 Loaded : 0% 0:00 Stream Type LIVE Seek to live, currently behind live LIVE Remaining Time - 0:00 1x Playback Rate Chapters Chapters Descriptions descriptions off , selected Captions captions settings , opens captions settings dialog captions off , selected Audio Track default , selected Picture-in-Picture Fullscreen This is a modal window. Beginning of dialog window. Escape will cancel and close the window. Text Color White Black Red Green Blue Yellow Magenta Cyan Opacity Opaque Semi-Transparent Text Background Color Black White Red Green Blue Yellow Magenta Cyan Opacity Opaque Semi-Transparent Transparent Caption Area Background Color Black White Red Green Blue Yellow Magenta Cyan Opacity Transparent Semi-Transparent Opaque Font Size 50% 75% 100% 125% 150% 175% 200% 300% 400% Text Edge Style None Raised Depressed Uniform Drop shadow Font Family Proportional Sans-Serif Monospace Sans-Serif Proportional Serif Monospace Serif Casual Script Small Caps Reset restore all settings to the default values Done Close Modal Dialog End of dialog window. Sponsored Links Sponsored Links Promoted Links Promoted Links You May Like Trekking pants for mountain sports and adventure travel Trek Kit India Shop Now Undo "Through outdoor experiments, we have successfully imaged millimetre-scale targets located at 1.36 km away, achieving a resolution enhancement by about 14 times over the diffraction limit of a single telescope," the study authors wrote. Letters smaller than a pencil width made visible from far away The team reported that the system could accurately read letters at a resolution of 3 millimetres, which is smaller than the width of a standard pencil. They said this marked a significant increase in spatial resolution, well beyond what a single telescope could achieve under normal conditions. Live Events MORE STORIES FOR YOU ✕ « Back to recommendation stories I don't want to see these stories because They are not relevant to me They disrupt the reading flow Others SUBMIT Practical uses and current limitations The researchers said the method has potential for high-resolution imaging and optical sensing . However, they also pointed out limitations. The system needs a direct line of sight and requires active illumination using lasers. This may not be suitable for stealth operations like covert surveillance. Future improvements under consideration The team plans to enhance laser control to allow easier targeting. They also aim to include artificial intelligence (AI) to help reconstruct images more accurately in the future.
NDTV
29-05-2025
- Science
- NDTV
China Develops Laser Tech That Can Read Tiny Text From Nearly 2km Away
Scientists in China say they have developed a laser that can observe tiny text and other fine details at a higher resolution from a distance of 1.36 kilometres. In a study published in the journal Physical Review Letters, researchers from the University of Science and Technology of China tested a new laser-based system that they say can pick up small details from nearly a mile away. The researchers took a new approach based on the way light hits a surface, rather than focusing on the image itself. This method is called active intensity interferometry. The Chinese scientists demonstrated that the method could be used to detect objects that, unlike stars, are not self-luminous. According to Science Alert, the researcher tested an instrument that emits eight infrared laser beams fired across a specific point in the distance. Two telescopes were then used to capture the intensity of the light reflections. Through a careful calibration of the eight laser beams lighting up the target, the image can be reconstructed by comparing variations between the readings from the two telescopes, researchers explained. "Through outdoor experiments, we have successfully imaged millimetre-scale targets located at 1.36 km away, achieving a resolution enhancement by about 14 times over the diffraction limit of a single telescope," the study authors wrote. The researchers believe this method is "promising for high-resolution optical imaging and sensing". The Chinese scientists revealed that through their setup, they were able to accurately read letters at a resolution of 3mm, smaller than the width of a pencil. That's a 14-fold improvement in spatial resolution compared to what a single telescope could achieve, they said. However, the researchers noted that there are still a few limitations they have to overcome - for example, it needs a clear line of sight to the object. The target must be illuminated with lasers, so it may not be suitable for surveillance scenarios where stealth is required. The team said that they have plans to improve the control of the laser as well, so that they are easier to direct. Moreover, the researchers may install artificial intelligence (AI), which could help reconstruct images more accurately.
