Ag<sub>2</sub>ZnSnS<sub>4</sub>–ZnS core–shell colloidal quantum dots: a near-infrared luminescent material based on environmentally friendly elements
Avijit Saha, Gerasimos Konstantatos
Abstract
-ZnS (AZTS-ZnS) core-shell QDs with precise control over the ZnS shell thickness and thereby its optical properties. Unlike indium based multinary (I-III-VI group) core-shell QDs these nanocrystals show a narrow photoluminescence (PL) full width at half maximum (fwhm) of 105-110 meV in the first NIR window. By monitoring the starting AZTS core size, we achieve tunable emission over a small NIR window in these QDs with the best PL quantum yield (PLQY) of 17.4%.
Topics & Concepts
PassivationMaterials scienceLuminescencePhosphorQuantum dotOptoelectronicsInfraredEnvironmentally friendlyColloidNanotechnologyPhotoluminescenceNanocrystalCore (optical fiber)Chemical engineeringOpticsComposite materialBiologyEcologyEngineeringLayer (electronics)PhysicsQuantum Dots Synthesis And PropertiesLuminescence Properties of Advanced MaterialsNanocluster Synthesis and Applications