Eco-friendly Emissive ZnO-graphene QD for bluish-white light-emitting diodes
- Eco-friendly Emissive ZnO-graphene QD for bluish-white light-emitting diodes
- 김홍희; 손동익; 황도경; 최원국
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- Recently, most studies concerning inorganic quantum dot (QD)-polymer hybrid LEDs have been concentrated on the structure with multiple layers and CdSe materials for color reproduction such as blue, green and red from the light source has been widely used. Cd(Cadmium) is one of the six substances banned by the Restriction on Hazardous Substances (RoHS) directive and classified into a hazardous substance for utilization and commercialization as well as for use in life, it was reported that the use of CdSe is not suitable to fabricate a Optoelectronic device. In this work, a novel, simple and facile technique is introduced for the synthesis of eco-friendly ZnO–graphene quasi-core–shell quantum dots utilizing graphene nanodot to overcome the toxic property of Cd. Also, we will report optical and structural properties of the hybrid quantum dots and the performance of LED. As one of results, the device produced bluish-white color of the maximum brightness 1118 cd/m2 with CIE coordinates (0.31, 0.26) at the bias 10 V.
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