On the Rational Design of Core/(Multi)-Crown Type-II Heteronanoplatelets

Delikanli, Savas; Canimkurbey, Betul; Hernández-Martínez, Pedro Ludwig; Shabani, Farzan; Isik, Ahmet Tarik; Ozkan, Ilayda; Bozkaya, Iklim; Bozkaya, Taylan; Isik, Furkan; Durmusoglu, Emek Goksu; Izmir, Merve; Akgun, Hakan; Demir, Hilmi Volkan

doi:10.1021/jacs.3c00999

Cited by 8 publications

(3 citation statements)

References 44 publications

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“…Also, during this time, the intensity of the bleach signal in the S-rich region decreases by more than 90%, accompanied by a concomitant increase in the CdSe region (Figure 2g). The driving force for the concentration of excitons toward the CdSe center stems from the energy offsets in the conduction (0.18 eV) and valence bands (0.42 eV) of CdSe and CdS for 4ML NPLs, 43 as well as their Coulombic interactions, given that holes experience a larger band offset and tend to localize more in the CdSe region. Apart from the TA spectroscopy, we performed wave function calculations to illustrate the probability density of the electrons and the holes within medium-DG NPLs, as presented in Figure S17a.…”

Section: Resultsmentioning

confidence: 99%

Near-Unity Emitting, Widely Tailorable, and Stable Exciton Concentrators Built from Doubly Gradient 2D Semiconductor Nanoplatelets

Liang,

Durmusoglu,

Lunina

et al. 2023

ACS Nano

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The strength of electrostatic interactions (EIs) between electrons and holes within semiconductor nanocrystals profoundly affects the performance of their optoelectronic systems, and different optoelectronic devices demand distinct EI strength of the active medium. However, achieving a broad range and fine-tuning of the EI strength for specific optoelectronic applications is a daunting challenge, especially in quasi two-dimensional core−shell semiconductor nanoplatelets (NPLs), as the epitaxial growth of the inorganic shell along the direction of the thickness that solely contributes to the quantum confined effect significantly undermines the strength of the EI. Herein we propose and demonstrate a doubly gradient (DG) core−shell architecture of semiconductor NPLs for on-demand tailoring of the EI strength by controlling the localized exciton concentration via in-plane architectural modulation, demonstrated by a wide tuning of radiative recombination rate and exciton binding energy. Moreover, these exciton-concentration-engineered DG NPLs also exhibit a near-unity quantum yield, high photo-and thermal stability, and considerably suppressed self-absorption. As proof-of-concept demonstrations, highly efficient color converters and highperformance light-emitting diodes (external quantum efficiency: 16.9%, maximum luminance: 43,000 cd/m 2 ) have been achieved based on the DG NPLs. This work thus provides insights into the development of high-performance colloidal optoelectronic device applications.

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Section: Resultsmentioning

confidence: 99%

Near-Unity Emitting, Widely Tailorable, and Stable Exciton Concentrators Built from Doubly Gradient 2D Semiconductor Nanoplatelets

Liang,

Durmusoglu,

Lunina

et al. 2023

ACS Nano

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“…Meanwhile, advanced control of NPL growth has enabled the growth of complex heterostructures [ 21–24 ] combining both crown (i.e., in‐plane growth) and shell (i.e., isotropic growth) with new functionalities such as photon up‐conversion [ 25 ] or multicolor emission. [ 26,27 ] However, in current structures, high thermal, chemical, or photonic stability always requires external shell growth.…”

Section: Introductionmentioning

confidence: 99%

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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“…In this quest for new heterostructures that can exhibit two-color 10–12 emission, maintaining confinement is an important step. In this sense, 2D nanoplatelets (NPLs) offer several advantages: (i) their specific growth mechanism 13,14 enables particularly narrow emissions, (ii) their anisotropic shape enables combining both strong confinement within the thickness while presenting a large lateral extension, (iii) their specific colloidal growth allows the design of complex heterostructures involving multiple interfaces 15–19 (iv) the several post-synthetic doping techniques leading toward dopant 20 or trap emissions. 21–25 Thus, NPLs expand the possibilities for emission quantum engineering.…”

Section: Introductionmentioning

confidence: 99%