Abstract
Colloidal CdSe quantum dots (QDs) with a strain-compensated ZnS/ZnCdS bilayer shell were synthesized and characterized. The core/shell/shell structure enjoys the benefits of excellent exciton confinement by the ZnS intermediate shell and strain compensation by the ZnCdS outer shell. The resulting CdSe/ZnS/ZnCdS QDs exhibited a 40% higher photoluminescence quantum yield and a more controllable wavelength compared to conventional CdSe/ZnCdS/ZnS core/shell/shell QDs with an intermediate lattice adaptor. CdSe/ZnS/ZnCdS QD light-emitting diodes (LEDs) had a luminance of 556 cd/m2 at 20 mA/cm2, 28% higher than that of CdSe/ZnCdS/ZnS QD-LEDs. The former also had better spectral purity at high injection currents and are thus better suited for full-color displays.
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