AUTHOR=Li Huimin , Jiang Xiaohong , Wang Anzhen , Chu Xiaotian , Du Zuliang 

TITLE=Simple Synthesis of CuInS2/ZnS Core/Shell Quantum Dots for White Light-Emitting Diodes

JOURNAL=Frontiers in Chemistry

VOLUME=8

YEAR=2020

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2020.00669

DOI=10.3389/fchem.2020.00669

ISSN=2296-2646

ABSTRACT=<p>In this study, the CuInS<sub>2</sub>/ZnS core/shell quantum dots (QDs) were prepared via simple and environmentally friendly solvothermal synthesis and were used as phosphors for white light-emitting diodes (WLEDs). The surface defect of the CuInS<sub>2</sub> core QDs were passivated by the ZnS shell by forming CuInS<sub>2</sub>/ZnS core/shell QDs. By adjusting the Cu/In ratio and the nucleation temperature, the photoluminescence (PL) peak of the CuInS<sub>2</sub> QDs was tunable in a range of 651–775 nm. After coating the ZnS layer and modifying oleic acid ligands, the PL quantum yield increased to 85.06%. The CuInS<sub>2</sub>/ZnS QD powder thermal stability results showed that the PL intensity of the QDs remained 91% at 100°C for 10 min. High color rendering index values (CRI, 90) and correlated color temperature of 4360 K for the efficient WLEDs were fabricated using CuInS<sub>2</sub>/ZnS QDs and (Ba,Sr)<sub>2</sub>SiO<sub>4</sub>:Eu<sup>2+</sup> as color converters in combination with a blue GaN light-emitting diode chip.</p>