Entries with tag university of toronto.

Researchers Create Silicon-Based LEDs

Scientists from Karlsruhe Institute of Technology and the University of Toronto report that they have made silicon-based LEDs using silicon nanocrystals that are able to emit various colors of light. These LEDs are free of heavy metals, which means the devices are not toxic. To date, scientists have been able to make silicon-based LEDs that emit only red light. The ability to produce LEDs capable of multicolored displays “is an absolutely novelty,” said Florian Maier-Flaig, a doctoral student at the Karlsruhe School of Optics and Photonics. The new system adjusts the color of light by separating the nanoparticles in the LED based on size, which helps their operational stability. Using multiple sizes of nanoparticles together typically triggers short circuits, but because the devices use a uniform size of nanoparticles, this technique also increases operational life. The researchers published their work in the journal Nano Letters. (PhysOrg)(Karlsruhe Institute of Technology)(Nano Letters)

Heartbeat Becomes Newest Security Biometric

A Canadian firm is developing biometric software focused on authentication that uses a heartbeat. Bionym, founded by two recent University of Toronto graduates, develops biometric software. Its HeartID software detects and distinguishes a heartbeat through the use of sensors. The resulting accuracy is greater than 99 percent, they say, which is on a par with existing fingerprint-enabled security. Foteini  Agrafioti developed the HeartID algorithm as part of her doctoral research at the university. The technology was transferred to Bionym, a company she launched with Karl Martin. HeartID could be licensed for use as an embedded security technology in video game controllers, tablet computers, cell phones, firearms, and automobiles. (PhysOrg)(University of Toronto)(Bionym)

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