Expanding the color palette of bicolor-emitting nanocrystals

Dabard, Corentin; Po, Hong; Fu, Ningyuan; Makke, Lina; Lehouelleur, Henri; Curti, Leonardo; Xu, Xiang Zhen; Lhuillier, Emmanuel; Diroll, Benjamin T.; Ithurria, Sandrine

doi:10.1039/d3nr03235c

Nanoscale

2023

DOI: 10.1039/d3nr03235c

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Expanding the color palette of bicolor-emitting nanocrystals

Corentin Dabard,

Hong Po,

Ningyuan Fu

et al.

Abstract: Thanks to their bright and tunable luminescence spectra, nanocrystals appear as a unique playground for light source design. Displays and lightnings require white light sources that combine several narrow lines....

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2024

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Cited by 2 publications

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“…A different class of bicolor emitters has been found in lateral heterostructures based upon the nanoplatelet (NPL) geometry. − In particular, multicolor emission in CdSe/CdS/CdTe core/crown/crown NPLs is attributed to the complex potential landscape which presents barriers for both electron and hole relaxation to their lowest respective excited states . In other lateral heterostructures displaying bicolor emission, such as CdSe/CdTe core/crowns, potential barriers are negligible, diffusion of excitons is highly efficient, and relaxation is typically fast with bicolor emission only observed over a narrow range of size and composition control. ,− With bicolor emission in CdSe/CdTe heterostructures under weak excitation, dynamic hole blockades or state filling is not applicable.…”

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Hole Relaxation Bottlenecks in CdSe/CdTe/CdSe Lateral Heterostructures Lead to Bicolor Emission

Diroll,

Dabard,

Hua

et al. 2024

Nano Lett.

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Concentric lateral CdSe/CdTe/CdSe heterostructures show bicolor photoluminescence from both a red charge transfer band of the CdSe/CdTe interface and a green fluorescence from CdSe. This work uses visible and near-infrared transient spectroscopy measurements to demonstrate that the deviation from Kasha's rule arises from a hole relaxation bottleneck from CdSe to CdTe. Hole transfer can take up to 1 ns, which permits radiative relaxation of excitons remaining in CdSe. Simulations indicate that the hole relaxation bottleneck arises due to the sparse density of states and poor spatial overlap of hole states at energies near the CdSe band edge. The divergent kinetics of transfer for band edge and hot holes is exploited to vary the ratio of green and red photoluminescence with excitation wavelength, providing another knob to control emission color. These findings support the use of lateral heterojunctions as a method for slowing carrier relaxation in two-dimensional materials.

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Hole Relaxation Bottlenecks in CdSe/CdTe/CdSe Lateral Heterostructures Lead to Bicolor Emission

Diroll,

Dabard,

Hua

et al. 2024

Nano Lett.

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Lateral Confinement in 2D Nanoplatelets: A Strategy to Expand the Colloidal Quantum Engineering Toolbox

Curti,

Dabard,

Makké

et al. 2024

Advanced Optical Materials

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Among colloidal nanocrystals, 2D nanoplatelets offer a unique set of properties with exceptionally narrow luminescence and low lasing thresholds. Furthermore, their anisotropic shape expands the playground for the complex design of heterostructures where spectra but also scattering rates can be engineered. A challenge that still remains is to combine shell growth which makes NPLs stable, with spectral tunability. Indeed, most reported shelled nanoplatelets end up being red emitters due to a loss of quantum confinement. Here, the combination of both lateral and in‐plane confinements within a single heterostructure is explored. A CdS/CdSe/CdS/CdZnS core–crown–crown shell structure that enables yellow emission is grown and that is responsive to a large range of excitation including visible photons, X‐ray photons, electron beams, and electrical excitations. k.p simulations predict that emission tunability of up to several 100 s of meV can be obtained in ideal structures. This material also displays stimulated emission resulting from bi‐exciton emission with a low threshold. Once integrated into an LED stack, this material is compatible with sub‐bandgap excitation and exhibits high luminance. Scaling of the electroluminescence properties by downsizing the pixel size is also investigated.

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Expanding the color palette of bicolor-emitting nanocrystals

Abstract: Thanks to their bright and tunable luminescence spectra, nanocrystals appear as a unique playground for light source design. Displays and lightnings require white light sources that combine several narrow lines....

Cited by 2 publications

References 43 publications

Hole Relaxation Bottlenecks in CdSe/CdTe/CdSe Lateral Heterostructures Lead to Bicolor Emission

Hole Relaxation Bottlenecks in CdSe/CdTe/CdSe Lateral Heterostructures Lead to Bicolor Emission

Lateral Confinement in 2D Nanoplatelets: A Strategy to Expand the Colloidal Quantum Engineering Toolbox

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