Multicolored Cd1−xZnxSe quantum dots with type-I core/shell structure: single-step synthesis and their use as light emitting diodes

Nanoscale ◽  
2014 ◽  
Vol 6 (7) ◽  
pp. 3881 ◽  
Author(s):  
Ying-Chih Pu ◽  
Yung-Jung Hsu
Keyword(s):  
Quantum Dots ◽  
Shell Structure ◽  
Light Emitting Diodes ◽  
Single Step ◽  
Core Shell ◽  
Type I ◽  
Light Emitting ◽  
Core Shell Structure

scholarly journals CsPbBr3/CdS Core/Shell Structure Quantum Dots for Inverted Light-Emitting Diodes Application

2019 ◽  
Vol 7 ◽  
Author(s):  
Xiaosheng Tang ◽  
Jie Yang ◽  
Shiqi Li ◽  
Weiwei Chen ◽  
Zhiping Hu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Shell Structure ◽  
Light Emitting Diodes ◽  
Core Shell ◽  
Light Emitting ◽  
Core Shell Structure

scholarly journals High efficiency blue light-emitting devices based on quantum dots with core-shell structure design and surface modification

RSC Advances ◽  
2021 ◽  
Vol 11 (23) ◽  
pp. 14047-14052
Author(s):  
Bin Zhao ◽  
Lixuan Chen ◽  
Wenyong Liu ◽  
Longjia Wu ◽  
Zizhe Lu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Surface Modification ◽  
Blue Light ◽  
Shell Structure ◽  
High Efficiency ◽  
Structure Design ◽  
Core Shell ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Core Shell Structure

The exposed Se on QD surface causes non-radiative relaxations which results in a low PLQY. However, the PLQY was improved from less than 8.0% up to above 85.0% by adding tributyl phosphine which can terminate the dangling bonds of the Se.

scholarly journals The Core/Shell Structure of CdSe/ZnS Quantum Dots Characterized by X-Ray Absorption Fine Spectroscopy

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Huijing Wei ◽  
Jing Zhou ◽  
Linjuan Zhang ◽  
Fang Wang ◽  
Jianqiang Wang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Shell Structure ◽  
Single Step ◽  
Organic Sulfur ◽  
Core Shell ◽  
X Ray ◽  
The Core ◽  
Absorption Fine ◽  
Core Shell Structure ◽  
X Ray Absorption

Understanding the chemical and physical properties of core/shell nanocrystal quantum dots (QDs) is key for their use in light-emission applications. In this paper, a single-step injection-free scalable synthetic method is applied to prepare high-quality core/shell QDs with emission wavelengths of 544 nm, 601 nm, and 634 nm. X-ray absorption fine structure spectra are used to determine the core/shell structure of CdSe/ZnS quantum dots. Moreover, theoretical XANES spectra calculated by FEFF.8.20 are used to determine the structure of Se and S compounds. The QD samples displayed nearly spherical shapes with diameters of approximately 3.4 ± 0.5 nm (634 nm), 4.5 ± 0.4 nm (601 nm), and 5.5 ± 0.5 nm (544 nm). With XANES results and MS calculations, it is indicated that sphalerite ZnS capped with organic sulfur ligands should be the shell structure. Wurtzite CdSe is the main core structure with a Cd-Se bond length of 2.3 Å without phase shift. This means that different emission wavelengths are only due to the crystal size with single-step injection-free synthesis. Therefore, single-step injection-free synthesis could generate a nearly ideal core/shell structure of CdSe/ZnS QDs capped with an organic sulfur ligand.

Surface Organic Ligands-Passivated Quantum Dots: Toward High-Performance Light-Emitting Diodes with Long Lifetime

2021 ◽  
Author(s):  
Lishuang Wang ◽  
Ying Lv ◽  
Jie Lin ◽  
Jialong Zhao ◽  
Xingyuan Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
High Performance ◽  
Light Emitting Diodes ◽  
Organic Ligands ◽  
Colloidal Quantum Dots ◽  
Core Shell ◽  
Light Emitting ◽  
Long Lifetime

For quantum dots light-emitting diodes (QLEDs), typical colloidal quantum dots (QDs) are usually composed of a core/shell heterostructure which is covered with organic ligands as surface passivated materials to confine...

Synthesis and Photoluminescent Properties of Core/Shell Structure ZnS∶Cu/ZnS Quantum Dots

2012 ◽  
Vol 33 (7) ◽  
pp. 736-741 ◽  
Author(s):  
田昕 TIAN Xin ◽  
曹立新 CAO Li-xin ◽  
柳伟 LIU Wei ◽  
苏革 SU Ge ◽  
董博华 DONG Bo-hua
Keyword(s):  
Quantum Dots ◽  
Shell Structure ◽  
Core Shell ◽  
Core Shell Structure
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