Quantum Dot LEDs
25 December 2007, 16:11
Categories: optics--photonics Quantum-Dots
The brightest quantum dot LEDs yet, which have been developed by researchers in the US and China, could provide lighting for displays that are clearer and richer in color, as well as being cheaper to make than existing ones.
“The brightness of the best LCD monitor on the market today is 500 candelas per square meter and the brightness of room light is about 2000 cd/m2,” says Andrew Wang of Ocean NanoTech, which developed the QDLEDs. “Our QDLEDs have reached 9000 cd/m2 in brightness, which makes them the brightest in the world.”
Quantum dots are nanoscale semiconductors that confine electrons in three dimensions. The quantum dots used in the Ocean NanoTech QDLEDs have a cadmium selenide core and a zinc sulphide “shell”. Electrons are excited to higher energy levels in the core and the shell, then fall into the empty spaces, or “holes”, left behind. The dot then forms an “exciton” and emits a particle of light.
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Posted by: The Editors
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