Spin-polarized zero-energy states in BN/C core–shell quantum dots

2013 ◽  
Vol 377 (15) ◽  
pp. 1102-1108 ◽  
Author(s):  
Aizhu Wang ◽  
Mingwen Zhao ◽  
Yan Xi ◽  
Xiaopeng Wang ◽  
Zhenhai Wang
Keyword(s):  
Quantum Dots ◽  
Core Shell ◽  
Zero Energy ◽  
Spin Polarized ◽  
Energy States

scholarly journals Electronic properties and quasi-zero-energy states of graphene quantum dots

2021 ◽  
Vol 103 (23) ◽  
Author(s):  
H. V. Grushevskaya ◽  
G. G. Krylov ◽  
S. P. Kruchinin ◽  
B. Vlahovic ◽  
Stefano Bellucci
Keyword(s):  
Quantum Dots ◽  
Electronic Properties ◽  
Graphene Quantum Dots ◽  
Zero Energy ◽  
Energy States

Optical Properties of Graphene Quantum Dots with Fractionally Filled Degenerate Shell of Zero Energy States

2011 ◽  
Author(s):  
A. D. Güçlü ◽  
P. Potasz ◽  
P. Hawrylak ◽  
Jisoon Ihm ◽  
Hyeonsik Cheong
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Graphene Quantum Dots ◽  
Zero Energy ◽  
Energy States

scholarly journals Zero-energy states of graphene triangular quantum dots in a magnetic field

2013 ◽  
Vol 88 (15) ◽  
Author(s):  
A. D. Güçlü ◽  
P. Potasz ◽  
P. Hawrylak
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
Zero Energy ◽  
Energy States

scholarly journals Zero-energy states in graphene quantum dots and rings

2011 ◽  
Vol 84 (15) ◽  
Author(s):  
C. A. Downing ◽  
D. A. Stone ◽  
M. E. Portnoi
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Zero Energy ◽  
Energy States

High-Temperature Synthesis of CdSe-Based Core/Shell, Core/Shell/Shell, and Core/Graded-Shell Nanoplatelets for Stable and Efficient Narrowband Emitters

2019 ◽  
Author(s):  
Aurelio A. Rossinelli ◽  
Henar Rojo ◽  
Aniket S. Mule ◽  
Marianne Aellen ◽  
Ario Cocina ◽  
...  
Keyword(s):  
Quantum Dots ◽  
High Temperature ◽  
Equilibrium Shape ◽  
Size Variation ◽  
Crystal Defects ◽  
Atomic Scale ◽  
Quantum Yields ◽  
Core Shell ◽  
Compositional Gradient ◽  
High Quality

<div>Colloidal semiconductor nanoplatelets exhibit exceptionally narrow photoluminescence spectra. This occurs because samples can be synthesized in which all nanoplatelets share the same atomic-scale thickness. As this dimension sets the emission wavelength, inhomogeneous linewidth broadening due to size variation, which is always present in samples of quasi-spherical nanocrystals (quantum dots), is essentially eliminated. Nanoplatelets thus offer improved, spectrally pure emitters for various applications. Unfortunately, due to their non-equilibrium shape, nanoplatelets also suffer from low photo-, chemical, and thermal stability, which limits their use. Moreover, their poor stability hampers the development of efficient synthesis protocols for adding high-quality protective inorganic shells, which are well known to improve the performance of quantum dots. <br></div><div>Herein, we report a general synthesis approach to highly emissive and stable core/shell nanoplatelets with various shell compositions, including CdSe/ZnS, CdSe/CdS/ZnS, CdSe/Cd<sub>x</sub>Zn<sub>1–x</sub>S, and CdSe/ZnSe. Motivated by previous work on quantum dots, we find that slow, high-temperature growth of shells containing a compositional gradient reduces strain-induced crystal defects and minimizes the emission linewidth while maintaining good surface passivation and nanocrystal uniformity. Indeed, our best core/shell nanoplatelets (CdSe/Cd<sub>x</sub>Zn<sub>1–x</sub>S) show photoluminescence quantum yields of 90% with linewidths as low as 56 meV (19.5 nm at 655 nm). To confirm the high quality of our different core/shell nanoplatelets for a specific application, we demonstrate their use as gain media in low-threshold ring lasers. More generally, the ability of our synthesis protocol to engineer high-quality shells can help further improve nanoplatelets for optoelectronic devices.</div>

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