retroremakes
December 8th, 2009, 02:05
http://cache.gawker.com/assets/images/4/2009/12/500x_led-light-quantum-dots-002_01.jpgI've had a nit to pick with LED lights and their sterile glow (http://gizmodo.com/5415502/hot-electric-metal-encased-in-a-sphere-of-glass). But quantum dots (http://gizmodo.com/tag/quantumdots/)—tiny crystals that emit a specific color—could be added to LEDs to alter their photonic output. Wee!
Gizmodo buddy Kate Greene interviewed QD Vision (http://gizmodo.com/tag/qdvision/)'s Seth Coe Sullivan and the founder of the MIT spinoff explained the process as such:
The quantum dot lighting solution is relatively simple: Adding red quantum dots to a white LED makes the resulting white light appear warmer. Light from the LED gives electrons in the quantum dots an energetic boost for a short time; when the electrons return to their lower energy state, they emit a photon, a process called photoluminescence. (Photoluminescence is in contrast to electroluminescence, in which electric current, not light, excites electrons.)
Unlike filters, the method does not soak up light and hurt efficiency — they're taking "blue photons from the LED and outputting red photons from the quantum dots." QD Vision's tech got some press earlier in the year, but I hadn't noticed it before writing my ode to the classic lightbulb. And although the bulbs aren't out yet, they'll be $100 when they are. We'll have to take one for a spin when they come around. And if they work, and last as long as they say they should, I'm going to kiss the incandescent goodbye forever. [Kate Greene (http://twitter.com/kgreene/status/6440276426)]
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Gizmodo buddy Kate Greene interviewed QD Vision (http://gizmodo.com/tag/qdvision/)'s Seth Coe Sullivan and the founder of the MIT spinoff explained the process as such:
The quantum dot lighting solution is relatively simple: Adding red quantum dots to a white LED makes the resulting white light appear warmer. Light from the LED gives electrons in the quantum dots an energetic boost for a short time; when the electrons return to their lower energy state, they emit a photon, a process called photoluminescence. (Photoluminescence is in contrast to electroluminescence, in which electric current, not light, excites electrons.)
Unlike filters, the method does not soak up light and hurt efficiency — they're taking "blue photons from the LED and outputting red photons from the quantum dots." QD Vision's tech got some press earlier in the year, but I hadn't noticed it before writing my ode to the classic lightbulb. And although the bulbs aren't out yet, they'll be $100 when they are. We'll have to take one for a spin when they come around. And if they work, and last as long as they say they should, I'm going to kiss the incandescent goodbye forever. [Kate Greene (http://twitter.com/kgreene/status/6440276426)]
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More... (http://feeds.gawker.com/~r/gizmodo/full/~3/y8Kx0NqRxZs/how-quantum-dots-could-make-leds-as-warm-as-candlelight)