Red-emitting,self-oxidizing carbon dots for the preparation of white LEDs with super-high color rendering index

Carbon dots(CDs),as a kind of carbon nanomaterials,have attracted widespread attention due to their unique structure and excellent optical properties,and they are low-cost,environmentally friendly and biocompatible.However,the development of near-infrared(NIR)emission CDs remains a challenge.In this study,we successfully prepared CDs with a maximum emission of714 nm using citric acid as the carbon source,thiourea and ammonium fluoride as the dopant source,and N,N-dimethylformamide as the solvent.The quantum yield(QY)is as high as 22.64%.Interestingly,the prepared CDs self-oxidize in the presence of oxygen,resulting in a blue shift of their emission.Therefore,they can be used to prepare white light-emitting diodes(WLEDs)without adding other fluorescent substances.Notably,the work presented herein constitutes the first report of WLEDs preparation from single CDs.

A novel strategy of fabricated flexible ITO electrode by liquid metal ultra-thin oxide film

Flexible transparent conductive films are gaining attention day by day over the last few years due to it is a key component of next generation flexible electronics and optoelectronic devices.Indium tin oxide(ITO)as one of the most widely used transparent conductive material is limited by the traditional deposition approach cannot be achieve ultra-thin,which results in its brittle nature.Herein,a novel strategy for fabricating highly transparent conductive films by liquid metal interface phase separation technique based on low-melting liquid metal of InxSn100-x alloy is reported,during the solid-to-liquid phase transition of alloy,the monolayer of surface oxide film segregated with the bulk phase and was printed on the flexible polyethylene-naphthalate(PEN)substrate under the van der Waals.This novel strategy can directly print the ultra-thin self-oxide with the structure of ITO on PEN substrate,with the resulting of transparency over 97.5%and resistivity as low as 0.21 kU cm,providing a new way of lowcost raw ITO material as well as the personalized preparation strategy.The desirable highly transparent conductive films are comparable to recently reported ITO film,together with advantages of pretty steady,make them attractive as various flexible transparent conductive electrodes,for example,an ultra-thin ITO film is developed for luminescent devices.