Researchers at the University of Toronto in Canada have made the first tuneable light-emitting diodes from colloidal cadmium selenide nanoplatelets that emit extremely pure green-blue light – a part of the electromagnetic spectrum to which the human eye is very sensitive. Since the devices emit in a very narrow bandwidth, even a change of 10 nm in the emission wavelength can be clearly detected. The structures could be used to make ultra-high-quality displays with significantly improved colours…..
http://nanotechweb.org/cws/article/tech/61517