Researchers may have found a less toxic alternative to using quantum dots in displays, the so called carbon dot which is a semiconductor that generate a rather cold light, in that they do not emit much yellow or red wavelengths. Previously the CDs were used as the white light which shone through QDs but they contain cadmium or lead which tends to be strictly controlled when used in consumer goods. Nanotechweb is reporting on the successful results of teams which are using cadmium free zinc copper indium sulphide core/shell QDs to produce displays with a significantly higher colour-rendering index than currently available LEDs are capable of, so we may still be on track for better displays in the next few years.
"By combining carbon dots that emit blue light and zinc copper indium sulphide quantum dots that emit in the green and red regions of the electromagnetic spectrum, researchers in China and the US have succeeded in making white light-emitting diodes with a high colour-rendering index of 93."
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