scholarly journals Emission State Structure and Linewidth Broadening Mechanisms in Type-II CdSe/CdTe Core–Crown Nanoplatelets: A Combined Theoretical–Single Nanocrystal Optical Study

2020 ◽  
Vol 124 (31) ◽  
pp. 17352-17363
Author(s):  
Violette Steinmetz ◽  
Juan I. Climente ◽  
Raj Pandya ◽  
Josep Planelles ◽  
Florent Margaillan ◽  
...  
Keyword(s):  
Type Ii ◽  
Optical Study ◽  
State Structure ◽  
Linewidth Broadening ◽  
Cdte Core

scholarly journals Efficient Diffusive Transport of Hot and Cold Excitons in Colloidal Type II CdSe/CdTe Core/Crown Nanoplatelet Heterostructures

2016 ◽  
Vol 2 (1) ◽  
pp. 174-181 ◽  
Author(s):  
Qiuyang Li ◽  
Boyang Zhou ◽  
James R. McBride ◽  
Tianquan Lian
Keyword(s):  
Diffusive Transport ◽  
Type Ii ◽  
Cdte Core

Atomistic effect of laterally and vertically growth shell on physical behaviours of CdSe/CdTe type-II core/crown and core/shell nanoplatelets: tight-binding theory

2021 ◽  
Vol 96 (12) ◽  
pp. 125867
Author(s):  
Worasak Sukkabot
Keyword(s):  
Charge Separation ◽  
Tight Binding ◽  
Band Gaps ◽  
Core Shell ◽  
Type Ii ◽  
Binding Theory ◽  
Theoretical Understanding ◽  
Spatial Charge ◽  
The Impact ◽  
Cdte Core

Abstract Utilizing the atomistic tight-binding theory, the impact of the lateral and vertical potential confinement by the coated shell on the CdSe/CdTe core/crown and core/shell nanoplatelets (NPLs) is attained. The spatial charge separation and encapsulated shell have a noteworthy impact on the electronic structures and optical properties because of the type-II band profile. The reduced band gaps with the growing laterally and vertically passivated shell thicknesses are due to the quantum confinement phenomena. The optical band gaps adjusted across the visible light are achieved by the shell thickness change. The excitonic binding energies of CdSe/CdTe core/shell NPLs are larger than those of CdSe/CdTe core/crown NPLs. Thanks to the spatial charge separation, a shortening of the oscillation strengths is concomitant with an increase of the radiative lifetimes. Overall, this scientific research underlines the importance of the theoretical understanding and practical control by lateral and vertical confinement of heterostructure NPLs.

High‐field magneto‐optical study of type‐II GaAs/AlAs short‐period superlattices

1991 ◽  
Vol 59 (1) ◽  
pp. 96-98 ◽  
Author(s):  
Satoshi Sasaki ◽  
Noboru Miura ◽  
Yoshiji Horikoshi
Keyword(s):  
High Field ◽  
Type Ii ◽  
Optical Study ◽  
Short Period ◽  
Short Period Superlattices

Synthesis of Type-I CdTe Core and Type-II CdTe/CdS Core/Shell Quantum Dots by a Hydrothermal Method and Their Optical Properties

2017 ◽  
Vol 90 (1) ◽  
pp. 52-58 ◽  
Author(s):  
Taichi Watanabe ◽  
Kohji Takahashi ◽  
Kunio Shimura ◽  
Hang-Beom Bu ◽  
Kim Hyeon-Deuk ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Hydrothermal Method ◽  
Core Shell ◽  
Type I ◽  
Type Ii ◽  
Cdte Core

scholarly journals Phonon Characterization, Structural and Optical Properties of Type-II CdSe/CdTe core/shell and Type-II/type-I CdSe/CdTe/ZnS core/shell/shell Quantum Dots

2020 ◽  
Vol 36 (3) ◽  
Author(s):  
Nguyen Xuan Ca ◽  
Nguyen Thi Hien
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Excitation Power ◽  
Cubic Phase ◽  
Core Shell ◽  
Type I ◽  
Type Ii ◽  
X Ray Diffraction ◽  
Cdte Core ◽  
Observation Results

The CdSe, type-II CdSe/CdTe core/shell and type-II/type-I CdSe/CdTe/ZnS core/shell/shell  quantum dots (QDs) were successfully synthesized in a noncoordinating solvent. The phonon characterizations, optical properties and structures of the synthesized QDs were characterized by Raman scattering (RS) spectra, photoluminescence (PL) spectroscopy, PL-decay lifetime, absorption spectroscopy (Abs), and X-ray diffraction (XRD). The growth of QDs was monitored by using RS, which demonstrated the formation of correct of the core/shell and core/shell/shell structures. Observation results from XRD reveal that all QDs crystallize in the cubic phase with zinc-blende structure. The typical characteristics of spatially indirect recombination for type-II QDs were observed through Abs and PL spectroscopy. The ZnS shell significantly enhanced the PL quantum yeild (QY), the optical durability, the chemical stability and separating CdSe/CdTe QDs from the surroundings. The effect of excitation power on the PL properties of the CdSe core,  CdSe/CdTe and CdSe/CdTe/ZnS QDs has been investigated.

Cascading electron and hole transfer dynamics in a CdS/CdTe core–shell sensitized with bromo-pyrogallol red (Br-PGR): slow charge recombination in type II regime

Nanoscale ◽  
2015 ◽  
Vol 7 (6) ◽  
pp. 2698-2707 ◽  
Author(s):  
Partha Maity ◽  
Tushar Debnath ◽  
Uday Chopra ◽  
Hirendra Nath Ghosh
Keyword(s):  
Electron Transfer ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Charge Recombination ◽  
Transient Absorption Spectroscopy ◽  
Core Shell ◽  
Type Ii ◽  
Pyrogallol Red ◽  
First Time ◽  
Cdte Core

For the first time ultrafast cascading hole and electron transfer dynamics in a CdS/CdTe type II core–shell sensitized with a molecular adsorbate (Br-PGR) have been demonstrated using transient absorption spectroscopy.

Type-II CdSe/CdTe Core/Crown Semiconductor Nanoplatelets

2014 ◽  
Vol 136 (46) ◽  
pp. 16430-16438 ◽  
Author(s):  
Silvia Pedetti ◽  
Sandrine Ithurria ◽  
Hadrien Heuclin ◽  
Gilles Patriarche ◽  
Benoit Dubertret
Keyword(s):  
Type Ii ◽  
Cdte Core

scholarly journals Type-II Colloidal Quantum Wells: CdSe/CdTe Core/Crown Heteronanoplatelets

2015 ◽  
Vol 119 (4) ◽  
pp. 2177-2185 ◽  
Author(s):  
Yusuf Kelestemur ◽  
Murat Olutas ◽  
Savas Delikanli ◽  
Burak Guzelturk ◽  
Mehmet Zafer Akgul ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Type Ii ◽  
Cdte Core

High-efficiency deep-red quantum-dot light-emitting diodes with type-II CdSe/CdTe core/shell quantum dots as emissive layers

2016 ◽  
Vol 4 (30) ◽  
pp. 7223-7229 ◽  
Author(s):  
Qingli Lin ◽  
Bin Song ◽  
Hongzhe Wang ◽  
Fengjuan Zhang ◽  
Fei Chen ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Red Light ◽  
Core Shell ◽  
Cdse Quantum Dots ◽  
Type Ii ◽  
Light Emitting ◽  
Cdte Core

Highly efficient deep-red light-emitting diodes (LEDs) fabricated by using type-II CdTe/CdSe quantum dots.

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