Browsing by Subject "ultrasmall nanoclusters"

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    Pure white‐light emitting ultrasmall organic‐inorganic hybrid perovskite nanoclusters
    (RSC, 2016-10) Teunis, Meghan B.; Lawrence, Katie N.; Dutta, Poulami; Siegel, Amanda P.; Sardar, Rajesh; Department of Chemistry & Chemical Biology, School of Science
    Organic–inorganic hybrid perovskites, direct band-gap semiconductors, have shown tremendous promise for optoelectronic device fabrication. We report the first colloidal synthetic approach to prepare ultrasmall (∼1.5 nm diameter), white-light emitting, organic–inorganic hybrid perovskite nanoclusters. The nearly pure white-light emitting ultrasmall nanoclusters were obtained by selectively manipulating the surface chemistry (passivating ligands and surface trap-states) and controlled substitution of halide ions. The nanoclusters displayed a combination of band-edge and broadband photoluminescence properties, covering a major part of the visible region of the solar spectrum with unprecedentedly large quantum yields of ∼12% and photoluminescence lifetime of ∼20 ns. The intrinsic white-light emission of perovskite nanoclusters makes them ideal and low cost hybrid nanomaterials for solid-state lighting applications.