Abstract
Synthesis of size-tunable indium phosphide (InP) quantum dots (QDs) with narrow size distribution has been long known to be more challenging due to the difficulties in controlling QDs nucleation and growth processes via precursor conversion kinetics. Here we present a “seed-mediated” two-step synthesis method for highly monodisperse InP QDs with sizes ranging from 1.9 to 4.5 nm. We further show the synthesis highly luminescent InP-based core-shell-shell QDs with tunable emission across the vis-ible spectrum (515 - 640 nm), having a full width at half-maximum (FWHM) of less than 40 nm for all the wavelengths. We then demonstrate the fabrication of green and red QDs light emitting diodes (QLEDs), and show that our devices exhibit supe-rior color purity than that of InP QDs-based LEDs reported previously. This study advances the chemical research community toward the goal of realizing high color pure emissions from cadmium-free QDs for display applications.
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