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Showing posts with the label QR code

Lead-free manganese-based perovskite quantum dot glass solves the dual problems of toxicity and environmental instability

https://www.eurekalert.org/news-releases/1121686 "utilizing lead halide perovskites highly efficient but toxic/ degrade quickly when exposed to moisture/ heat, but substituting non-toxic cesium manganese bromide has low light-emission efficiency... overcome introducing europium(III) energy-transfer pathway boosting light output: 3.37X higher quantum yield... quantum dots embedded within borosilicate glass protecting from water/ oxygen, retained 97% light intensity after stored in water >450 days... anti-counterfeiting QR codes, high-durability red/ white LEDs" Related: Professor Tae-Woo Lee’s research team achieves world-leading efficiency in vapor-deposited perovskite LEDs https://www.eurekalert.org/news-releases/1136555

QR code measuring 1.98 μm^2, requiring electron microscope to be read, can preserve data for centuries/ millennia

https://www.eurekalert.org/news-releases/1116677 "individual pixels 49 nm... code milled into thin ceramic films using focused ion beams, ensuring chemically/ physically stable long-term data storage unlike magnetic and electronic media/ hard drives lasting only a few years... requires no energy/ cooling to maintain data once written... single A4 sheet could theoretically hold over 2 terabytes... data centers... future: increasing writing speeds and developing scalable manufacturing processes for more complex data structures"