4.8 Review

Atomically flat semiconductor nanoplatelets for light-emitting applications

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Review Chemistry, Multidisciplinary

Colloidal Metal-Halide Perovskite Nanoplatelets: Thickness-Controlled Synthesis, Properties, and Application in Light-Emitting Diodes

Clara Otero-Martinez et al.

Summary: Colloidal metal-halide perovskite nanocrystals have gained attention for their exciting properties and tunable emission range. However, they are limited by light-induced halide phase segregation. By controlling the thickness, monolayer nanoplatelets with narrow emission peaks and high radiative recombination can be synthesized, making them ideal for efficient LEDs.

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Highly Stable 3D Supercuboids to 2D ZnSe Nanosheets: Formation for a High-Efficiency Catalysis System

Hao Fu et al.

Summary: A facile colloidal chemistry method is reported to obtain three-dimensional supercuboids from two-dimensional ZnSe nanosheets. The highly stable supercuboids can be readily transformed back to nanosheets through an exfoliation process. The potential application of ZnSe nanosheets in catalysis is demonstrated in the aldol condensation reaction.

JOURNAL OF PHYSICAL CHEMISTRY LETTERS (2022)

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Impacts of Dopant and Post-Synthetic Heat-Treatment on Carrier Relaxation of Cu2+-Doped CdSe Nanoplatelets

Anusri Medda et al.

Summary: The impact of Cu2+ doping and post-synthetic heat treatment on structural modification and carrier relaxation of CdSe NPLs is studied. It is found that Cu atoms substitutionally replace Cd atoms, resulting in significant photoluminescence quenching and shorter decay time. The influence of doping and heat treatment on carrier relaxation processes is confirmed by fs-TAS study, providing a basis for the design of new optoelectronic devices.

JOURNAL OF PHYSICAL CHEMISTRY C (2022)

Article Materials Science, Multidisciplinary

Green CdSe/CdSeS Core/Alloyed-Crown Nanoplatelets Achieve Unity Photoluminescence Quantum Yield over a Broad Emission Range

An Hu et al.

Summary: This study develops a new synthesis protocol to produce high-quality CdSe/CdSeS core/alloyed-crown nanoplatelets with high photoluminescence quantum yield, continuous tunability of emission peaks, and low full-width-at-half-maximum. These nanoplatelets show potential for developing advanced light sources.

ADVANCED OPTICAL MATERIALS (2022)

Article Chemistry, Physical

Efficient CsPbBr3 Nanoplatelet-Based Blue Light-Emitting Diodes Enabled by Engineered Surface Ligands

Haoran Wang et al.

Summary: In this study, short-ligand capped CsPbBr3 nanoplatelets were successfully synthesized with controlled crystal growth kinetics and surface defect passivation. Further treatment with short conjugation ligand improved their electrical performance and luminous efficiency.

ACS ENERGY LETTERS (2022)

Article Chemistry, Multidisciplinary

High-Performance Deep Red Colloidal Quantum Well Light-Emitting Diodes Enabled by the Understanding of Charge Dynamics

Sujuan Hu et al.

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2D CdSe/CdS Core-Shell Nanoplatelets for High-Performance Photodetectors

Avisek Dutta et al.

Summary: This work highlights the influence of reaction growth time on the properties of cadmium chalcogenide nanoplatelets, with a focus on structural and photophysical aspects. By extending the growth time, improvements in photoluminescence emission and decay time have been achieved, as well as slower dynamics in bleach recovery. The CdSe/CdS CS NPLs-based photodetectors show promising performance for next-generation optoelectronic applications.

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Controlled Core/Crown Growth Enables Blue-Emitting Colloidal Nanoplatelets with Efficient and Pure Photoluminescence

An Hu et al.

Summary: This study achieves near-trap-free blue-emitting nanoplatelets (NPLs) through controlled growth of the core/crown. The results show that deep trap states in NPLs can be effectively suppressed with asymmetrical crown growth and the growth of a small core and an alloyed symmetrical crown. This leads to NPLs with pure blue emissions and near-unity photoluminescence quantum yields (PLQYs).
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Mn:CsPbBr3 Nanoplatelets for Bright White-Emitting Displays

Yubin Zhao et al.

Summary: Controlled ion-exchange reactions were used to synthesize Mn-doped CsPbBr3 nanoplatelets with superior photoluminescence properties. By adjusting the thickness and Mn doping level, the photoluminescence peaks and intensity of the NPLs were successfully tuned. The ion exchange process enhanced the PL quantum yield and intensity without changing the morphology of the sample.

ACS APPLIED NANO MATERIALS (2021)

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Colloidal Manganese-Doped ZnS Nanoplatelets and Their Optical Properties

Liwei Dai et al.

Summary: This study presents the successful direct doping of Mn2+ ions into ZnS nanoplatelets using a nucleation-doping strategy, resulting in Mn luminescence in ZnS:Mn NPLs. Energy transfer from ZnS NPLs to Mn2+ ions was observed, and the impact of Mn concentration on optical properties was systematically investigated. Tunable Mn emission and enhanced PL quantum yield in ZnS:Mn NPLs were achieved by passivating surface trap states. The synthetic strategy introduced here opens up new possibilities for further doped systems of two-dimensional NPLs.

CHEMISTRY OF MATERIALS (2021)

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Recent Advances and Perspectives on Colloidal Semiconductor Nanoplatelets for Optoelectronic Applications

Avisek Dutta et al.

Summary: The Perspective provides fundamental insights into the ultrafast dynamics and luminescent properties of 2D semiconductor NPLs and their heterostructures, discussing the importance of hot carrier cooling dynamics and slow exciton recombination in controlling device performance. The potential applications of designing 2D NPLs heterostructures for various optoelectronic applications by combining with different materials are also highlighted.

JOURNAL OF PHYSICAL CHEMISTRY C (2021)

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Probing Excitons in Ultrathin PbS Nanoplatelets with Enhanced Near-Infrared Emission

Francisco Manteiga Vazquez et al.

Summary: Colloidal PbS nanoplatelets (NPLs) with a cubic crystal structure were studied for their photoexcited excitons characteristics and dynamics, with their photoluminescence quantum yield significantly enhanced after CdCl2 treatment. Surface treatment and exciton-phonon interactions were utilized to control and improve the optical properties of IV-VI semiconductor NPLs.

JOURNAL OF PHYSICAL CHEMISTRY LETTERS (2021)

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Surface Modification of CdE (E: S, Se, and Te) Nanoplatelets to Reach Thicker Nanoplatelets and Homostructures with Confinement-Induced Intraparticle Type I Energy Level Alignment

Nicolas Moghaddam et al.

Summary: The study demonstrates a method to increase the thickness of two-dimensional II-VI semiconductor nanoplatelets by replacing native carboxylate ligands with halides. Through a dissolution/recrystallization process, the thickness can be increased to 9 ML, while also achieving the growth of CdSe/CdSe, CdTe/CdTe, and CdSe/CdTe core/shell homo- and heterostructures. This method affords a new degree of freedom for the growth of structured nanoplatelets with designed band engineering, expanding the capabilities beyond what has been achievable for heteromaterial nanostructures.

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Contrasting Ligand-Exchange Behavior of Wurtzite and Zinc-Blende Cadmium Telluride Nanoplatelets

Haochen Sun et al.

Summary: The ligand-exchange chemistries of wurtzite (WZ) and zinc-blende (ZB) CdTe nanoplatelets exhibit contrasting behaviors, which are consistent with their facet structures. WZ nanoplatelets prefer nonpolar facets and neutral ligation, while ZB nanoplatelets prefer polar, cationic facets and anionic ligation.

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Origin of Low Temperature Trion Emission in CdSe Nanoplatelets

Albert F. Vong et al.

Summary: Colloidal semiconductor nanoplatelets are scalable materials for optoelectronic applications and can be used for spin-to-photon transduction in quantum information networks. Negative trions are appealing emitters, but more preparation knowledge is needed to use them as single photon-emitting states. Through power-dependent time-resolved transient absorptions, it was shown that trions form via biexciton decay and not through collisional mechanisms typical for 2D materials.

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Nanocrystal Quantum Dots: From Discovery to Modern Development

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Atomistics of Asymmetric Lateral Growth of Colloidal Zincblende CdSe Nanoplatelets

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Light-Induced Paramagnetism in Colloidal Ag+-Doped CdSe Nanoplatelets

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Cation Exchange Enabled Cu Dopants Location Tailoring and Photoelectric Properties Regulation in CdS Nanosheets

Shuman Jia et al.

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Near-Infrared-Emitting CdxHg1-xSe-Based Core/Shell Nanoplatelets

Andrei Mitrofanov et al.

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Role of Trap States in Excitation Wavelength-Dependent Photoluminescence of Strongly Quantum-Confined All-Inorganic CsPbBr3 Perovskites with Varying Dimensionalities

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Engineering of Exciton Spatial Distribution in CdS Nanoplatelets

Yan Zhang et al.

Summary: Zinc-blende CdS nanoplatelets with atomically flat {100} basal planes terminated by either Cd or S atoms were synthesized, showing different band gaps and optical properties. By precisely controlling the surface structure, it is possible to engineer the spatial distribution of excitons, opening up new possibilities for semiconductor nanocrystals.

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