Nanoco Group plc has challenged a new advisory report from the Öko Institute in as far as it recommends the extension of an exemption as part of the Restriction of certain Hazardous Substances (RoHS) Directive that would allow the use of cadmium-containing quantum dots in Europe in TVs and displays.   The same Öko Institute report called for an end to the exemption allowing the use of cadmium in LED lighting. The European Commission, European Parliament and EU Member States will next evaluate ...