Facet‐Dependent On‐Surface Reactions in the Growth of CdSe Nanoplatelets

Zhu, Chenqi; Chen, Dongdong; Cao, Weicheng; Lai, Runchen; Pu, Chaodan; Li, Jiongzhao; Kong, Xueqian; Peng, Xiaogang

doi:10.1002/anie.201909576

Cited by 33 publications

(54 citation statements)

References 49 publications

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“…The latter is conrmed by the signicantly lower PLQY of quasi-quadratic core only NPLs aer purication (0.7% vs. 8.0% for quasirectangular NPLs). 33,57 In this regard, also the differences in the formation process of NPLs with different aspect ratios need to be taken into account. While the thickness of CdSe NPLs is kinetically controlled, 58,59 their shape (in case of 4 ML NPLs) is determined by the amount of water (more precisely the amount of OH À ions) in the reaction mixture.…”

Section: Resultsmentioning

confidence: 99%

CdS crown growth on CdSe nanoplatelets: core shape matters

2020

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Section: Resultsmentioning

confidence: 99%

CdS crown growth on CdSe nanoplatelets: core shape matters

2020

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“…The exposed Cd‐terminated basal facets of colloidal zinc blende CdSe NPLs are composed of structurally identical polar [ 28 ] planes and thus are stabilized by various types of ligands [ 75 ] to assure charge neutrality. Although there are several competing formation mechanisms of CdSe NPLs, including oriented attachment with specific precursors, [ 76,77 ] anisotropic Ostwald ripening of small NPLs, [ 78 ] and kinetic instability caused by insoluble precursors, [ 79 ] the driving force of anisotropic growth for CdSe NPLs with isotropic zinc blende lattice structure is still under debate. However, ligands are believed to play an important role during the anisotropic growth of CdSe NPLs.…”

Section: Emission Tunability For Cdse‐based Nplsmentioning

confidence: 99%

Manipulation of the Optical Properties of Colloidal 2D CdSe Nanoplatelets

Zhang

Sun

2021

Advanced Photonics Research

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Driven by the unique optoelectronic features arising from the strong quantum confinement along the thickness direction, rapid development of CdSe‐based nanoplatelets (NPL) has accomplished facile bandgap tunability over a broad spectrum via different preparation protocols or various postsynthesis treatments. The anisotropic geometry of NPLs also stimulates the exploitation of self‐assembled CdSe NPL superstructures to enhance light extraction efficiency in display technologies and achieves polarized lasing performance or even electrically pumped laser by adjusting the transition dipole orientation. Although several review articles about the general optical properties of CdSe NPLs have been published, none of them focus on the ability of spectral tunability and precise control of orientations in the solid‐state phase of CdSe NPLs. Herein, the band structure engineering approaches in the CdSe NPL family are systematically summarized and the optical properties and device performance metrics of these deliberately engineered NPLs are compared. Then, the recent advanced studies of the motivation and assembly methods of geometrically anisotropic CdSe NPL superlattices are discussed. Finally, the current challenges and future outlook on the controlled modification of optical features and the influences of the approaches in the aspect of CdSe NPL–based devices’ performance are highlighted.

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“…2(a) and 2(b)). For the Se-ZnSe QDs, their surface ligands are either fatty amines (R'NH2) bonded on the remaining Zn sites or (Se)-H-NH2R' on the Se sites [40,43]. For such ligand configurations, they would not appear significantly larger than the corresponding Zn-ZnSe QDs coated with Zn-(OOCR)2 ligands under TEM.…”

Section: Size Shape and Crystallinity Of The Se-znse Qdsmentioning

confidence: 99%

Surface and intrinsic contributions to extinction properties of ZnSe quantum dots

Lin

et al. 2020

Nano Res.

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This work studies extinction properties of ZnSe quantum dots terminated with either Se-surface or Zn-surface (Se-ZnSe or Zn-ZnSe QDs). In addition to commonly observed photoluminescence quenching by anionic surface sites, Se-ZnSe QDs are found to show drastic signatures of Se-surface states in their UV-visible (Vis) absorption spectra. Similar to most QDs reported in literature, monodisperse Zn-ZnSe QDs show sharp absorption features and blue-shifted yet steep absorption edge respect to the bulk bandgap. However, for monodisperse Se-ZnSe QDs, all absorption features are smeared and a low-energy tail is identified to extend to an energy window below the bulk ZnSe bandgap. Along increasing their size, a cyclic growth of ZnSe QDs switches their surface from Zn-terminated to Se-terminated ones, which confirms that the specific absorption signatures are reproducibly repeated between those of two types of the QDs. Though the extinction coefficients per unit of Se-ZnSe QDs are always larger than those of Zn-ZnSe QDs with the same size, both of them approach the same bulk limit. In addition to contribution of the lattice, extinction coefficients per nanocrystal of Zn-ZnSe QDs show an exponential term against their sizes, which is expected for quantum-confinement enhancement of electron-hole wavefunction overlapping. For Se-ZnSe QDs, there is the third term identified for their extinction coefficients per nanocrystal, which is proportional to the square of size of the QDs and consistent with surface contribution.

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Facet‐Dependent On‐Surface Reactions in the Growth of CdSe Nanoplatelets

Cited by 33 publications

References 49 publications

CdS crown growth on CdSe nanoplatelets: core shape matters

CdS crown growth on CdSe nanoplatelets: core shape matters

Manipulation of the Optical Properties of Colloidal 2D CdSe Nanoplatelets

Surface and intrinsic contributions to extinction properties of ZnSe quantum dots

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