Journal of NanophotonicsLuminescence enhancement of nanocrystal quantum wells by bandgap and strain engineering
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CdSe-based nanocrystal quantum wells (QWs) were synthesized around CdS nanocrystal quantum dots and were bandgap- and strain-engineered to achieve high-efficiency short-wavelength luminescence. Tuning the CdSe QW width in the range of 1.05 to 1.58 nm has led to blue-green light emission, whose quantum yield was improved up to 48% through strain compensation by an optimized ZnS outer shell. The luminescence spectrum can be modified by adding a ZnS inner barrier layer to block charge and exciton transfer between the QW and CdS core. Strain management by adjusting the well and barrier thickness has proven critical in such a complex multilayer quantum system for obtaining high-quality nanocrystals and light emission.