ZnSe/ZnS Core/Shell Quantum Dots with Superior Optical Properties through Thermodynamic Shell Growth

Nano Letters
Botao JiUri Banin

Abstract

Epitaxial growth of a protective semiconductor shell on a colloidal quantum dot (QD) core is the key strategy for achieving high fluorescence quantum efficiency and essential stability for optoelectronic applications and biotagging with emissive QDs. Herein we investigate the effect of shell growth rate on the structure and optical properties in blue-emitting ZnSe/ZnS QDs with narrow emission line width. Tuning the precursor reactivity modifies the growth mode of ZnS shells on ZnSe cores transforming from kinetic (fast) to thermodynamic (slow) growth regimes. In the thermodynamic growth regime, enhanced fluorescence quantum yields and reduced on-off blinking are achieved. This high performance is ascribed to the effective avoidance of traps at the interface between the core and the shell, which are detrimental to the emission properties. Our study points to a general strategy to obtain high-quality core/shell QDs with enhanced optical properties through controlled reactivity yielding shell growth in the thermodynamic limit.

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Citations

Jul 28, 2020·International Journal of Molecular Sciences·Kim-Hung HuynhBong-Hyun Jun
Oct 16, 2020·Nature·Taehyung KimEunjoo Jang
Mar 9, 2021·ACS Applied Materials & Interfaces·Iva RrezaJonathan S Owen
Apr 30, 2021·Comparative Biochemistry and Physiology. Toxicology & Pharmacology : CBP·Yanhong DingLi Jin
Apr 21, 2021·Chemical Communications : Chem Comm·Zhengze YuBo Tang
Jul 6, 2021·Chemistry of Materials : a Publication of the American Chemical Society·Reyhaneh ToufanianAllison M Dennis
Sep 1, 2021·Nano Letters·Andrew B PunDavid J Norris

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Methods Mentioned

BETA
electron scattering

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