1 research outputs found
Semiconductor Seeded Nanorods with Graded Composition Exhibiting High Quantum-Yield, High Polarization, and Minimal Blinking
Seeded
semiconductor nanorods represent a unique family of quantum confined
materials that manifest characteristics of mixed dimensionality. They
show polarized emission with high quantum yield and fluorescence switching
under an electric field, features that are desirable for use in display
technologies and other optical applications. So far, their robust
synthesis has been limited mainly to CdSe/CdS heterostructures, thereby
constraining the spectral tunability to the red region of the visible
spectrum. Herein we present a novel synthesis of CdSe/Cd<sub>1–<i>x</i></sub>Zn<sub><i>x</i></sub>S seeded nanorods
with a radially graded composition that show bright and highly polarized
green emission with minimal intermittency, as confirmed by ensemble
and single nanorods optical measurements. Atomistic pseudopotential
simulations elucidate the importance of the Zn atoms within the nanorod
structure, in particular the effect of the graded composition. Thus,
the controlled addition of Zn influences and improves the nanorods’
optoelectronic performance by providing an additional handle to manipulate
the degree confinement beyond the common size control approach. These
nanorods may be utilized in applications that require the generation
of a full, rich spectrum such as energy-efficient displays and lighting