Articles tagged with "perovskite"
Perovskite image sensor triples light capture, sharpens resolution
Researchers at ETH Zurich and Empa in Switzerland have developed a novel perovskite-based image sensor that significantly outperforms traditional silicon sensors in light sensitivity, resolution, and color accuracy. Unlike conventional sensors that rely on color filters—resulting in substantial light loss by capturing only about one-third of incoming photons per pixel—the new sensor uses stacked layers of lead halide perovskite crystals. Each layer is chemically tuned to absorb a specific wavelength (red, green, or blue) without filters, enabling each pixel to capture the full spectrum of light. This design allows the sensor to capture up to three times more light and achieve three times greater spatial resolution than current silicon-based sensors. The perovskite sensor’s tunability comes from adjusting the chemical composition of the crystals, specifically the ratios of iodine, bromine, and chlorine ions, to target different colors. This approach not only enhances image clarity and color precision but also reduces digital artifacts. The researchers have successfully miniaturized the technology
materialsperovskiteimage-sensorlight-capturesemiconductormachine-visiondigital-photographyChina advances next-gen lighting with more stable perovskite LEDs
Chinese researchers led by Professor Xiao Zhengguo at the University of Science and Technology of China have developed an innovative all-inorganic perovskite film that significantly enhances LED performance. By introducing specially selected compounds and applying a high-temperature annealing process, the team engineered perovskite films with larger crystal grains and fewer defects. This structural improvement facilitates better charge transport, resulting in LEDs with unprecedented brightness of 1.16 million nits and an extended operational lifespan exceeding 180,000 hours. These advancements overcome previous limitations where perovskite LEDs had short lifespans and low brightness, making them unsuitable for practical applications. The new perovskite LEDs also demonstrate a luminous efficiency surpassing 22%, comparable to current commercial display technologies, and brightness levels far exceeding typical OLED and LED screens, which usually peak at a few thousand nits. Such high brightness and durability make these LEDs promising for outdoor displays and specialized lighting requiring strong visibility. When operated at a standard brightness of 100
materialsperovskiteLED-technologyadvanced-materialsenergy-efficient-lightingnanomaterialsdisplay-technologyNREL-Led Research Effort Adds Salt, Boosts Performance of Perovskites
energysolar-cellsperovskiterenewable-energyphotovoltaic-technologyefficiencydurability