Strain-graded quantum dots with spectrally pure, stable and polarized emission
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Author
Jung, Dongju
Park, Jeong Woo
Min, Sejong
Lee, Hak June
Park, Jin Su
Kim, Gui-Min
Bulliard, Xavier
Pugin, Raphaël
Shin, Doyoon
Im, Seongbin
DOI
10.1038/s41467-024-49791-z
Abstract
Structural deformation modifies the bandgap, exciton fine structure and
phonon energy of semiconductors, providing an additional knob to control
their optical properties. The impact can be exploited in colloidal semiconductor
quantum dots (QDs), wherein structural stresses can be imposed in
three dimensions while defect formation is suppressed by controlling surface
growth kinetics. Yet, the control over the structural deformation of QDs free
from optically active defects has not been reached. Here, we demonstrate
strain-graded CdSe-ZnSe core-shell QDs with compositionally abrupt interface
by the coherent pseudomorphic heteroepitaxy. Resulting QDs toleratemutual
elastic deformation of varyingmagnitudes at the interface with high structural
fidelity, allowing for spectrally stable and pure emission of photons at accelerated
rates with near unity luminescence efficiency. We capitalize on the
asymmetric strain effect together with the quantum confinement effect to
expand emission envelope of QDs spanning the entire visible region and
exemplify their use in photonic applications.
Publication Reference
Nature Communications (2024) 15:5561
Year
2024-07-02