Microwave-Assisted Synthesis of CdS/ZnS:Cu QuantumDots for White Light-Emitting Diodes with High Color Rendition.

Highquality CdS/ZnS:Cu quantum dots (QDs) were first synthesizedvia a green microwave irradiation route. As-prepared core/shell dopedQDs presented a strong absorption in the blue light region and highlyefficient red to deep red emission with a maximum quantum yield of40%. The composite formed by dispersing CdS/ZnS:Cu QDs into siliconeresin showed an excellent photostability under blue illumination.Finally, high color rendition white light was generated from the CdS/ZnS:CuQDs-assisted phosphor-converted white light-emitting diode (WLED)in which there was no reabsorption between quantum dots and phosphors.Under operation of 40 mA forward bias current, the fabricated WLEDemitted bright natural white light with a high color rendering indexof 90, a luminous efficiency of 46.5 lm/W, and the correlated colortemperature of 6591 K. Simultaneously, the good color stability wasaccompanied by the CIE color coordinates of (0.3155, 0.3041) underdifferent forward bias currents. [ABSTRACT FROM AUTHOR]