Abstract
Colloidal semiconductor nanoparticles possess unique size, shape and composition dependent optical properties, which make them appealing candidates for light-emitting devices (LEDs). However, due to enhanced reabsorption and energy transfer associated losses at high nanoparticle concentrations, which are required for LEDs, photoluminescence quantum yield of the nanoparticles significantly decreases, limiting external quantum efficiency of the LEDs. Therefore, Stokes shift engineered nanoparticles that allow for the suppression of the reabsorption and energy transfer losses are of great practical interest. Here, we report on gradient alloy CdSe1−xSx/CdS core-shell nanoplatelets, which provide tunable and large Stokes-shifted narrow emission. We demonstrate that the spectrally separation of absorption and emission peaks of CdSe1−xSx/CdS core-shell nanoplatelets is due to their gradient composition. Gradient alloy CdSe1−xSx/CdS core-shell nanoplatelets reveal an order of magnitude larger Stokes shift (310 – 422 meV) compared to that of conventional CdSe/CdS core-shell nanoplatelets. Moreover, unlike CdSe/CdS core-shell nanoplatelets, emission wavelength of gradient alloy CdSe1−xSx/CdS core-shell nanoplatelets can be finely controlled within the range of 500 – 600 nm via changing the composition of the core and thickness of the shell. We believe that the developed here gradient alloy CdSe1−xSx/CdS core-shell nanoplatelets, which provide tunable and large Stokes-shifted emission will be of interest for the development of high-efficiency LEDs with controllable optical properties.
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