PHOTO-IRRADIATION EFFECTS ON PREPARATION OF COLLOIDAL QUANTUM DOTS AND THEIR SURFACE MODIFICATION

2001 ◽  
Author(s):  
D. KIM ◽  
N. TERATANI ◽  
K. MIZOGUCHI ◽  
H. NISHIMURA ◽  
M. NAKAYAMA
Keyword(s):  
Quantum Dots ◽  
Surface Modification ◽  
Colloidal Quantum Dots ◽  
Irradiation Effects

PHOTO-IRRADIATION EFFECTS ON PREPARATION OF COLLOIDAL QUANTUM DOTS AND THEIR SURFACE MODIFICATION

2001 ◽  
Vol 15 (28n30) ◽  
pp. 3829-3832 ◽  
Author(s):  
D. KIM ◽  
N. TERATANI ◽  
K. MIZOGUCHI ◽  
H. NISHIMURA ◽  
M. NAKAYAMA
Keyword(s):  
Quantum Dots ◽  
Surface Modification ◽  
Size Distribution ◽  
Size Control ◽  
Band Edge Emission ◽  
Irradiation Effects ◽  
Edge Emission ◽  
Distribution Width ◽  
Cds Qds ◽  
Pbs Quantum Dots

We have investigated the possibility of size control of CdS and PbS quantum dots (QDs) with a narrow size distribution and the influence of the surface modification of the dots on their luminescence properties. The reduction of the size-distribution width of the CdS QDs grown in polyvinylpyrrolidone or polyvinyl alcohol solutions was succeeded by a size-selective photoetching. We controlled the size of the CdS QDs with the narrow distribution by changing the initial condition of the sample preparation and the irradiation-light energy. The QDs of PbS were grown with the different disperse agents and growth temperature. The band-edge emission is strongly activated by the surface modification of the CdS QDs.

scholarly journals Cascade surface modification of colloidal quantum dot inks enables efficient bulk homojunction photovoltaics

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Min-Jae Choi ◽  
F. Pelayo García de Arquer ◽  
Andrew H. Proppe ◽  
Ali Seifitokaldani ◽  
Jongmin Choi ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Surface Modification ◽  
Surface Chemistry ◽  
Surface Passivation ◽  
Diffusion Length ◽  
Power Conversion ◽  
Colloidal Quantum Dots ◽  
Semiconductor Materials ◽  
Colloidal Quantum Dot ◽  
Reduced Surface

AbstractControl over carrier type and doping levels in semiconductor materials is key for optoelectronic applications. In colloidal quantum dots (CQDs), these properties can be tuned by surface chemistry modification, but this has so far been accomplished at the expense of reduced surface passivation and compromised colloidal solubility; this has precluded the realization of advanced architectures such as CQD bulk homojunction solids. Here we introduce a cascade surface modification scheme that overcomes these limitations. This strategy provides control over doping and solubility and enables n-type and p-type CQD inks that are fully miscible in the same solvent with complete surface passivation. This enables the realization of homogeneous CQD bulk homojunction films that exhibit a 1.5 times increase in carrier diffusion length compared with the previous best CQD films. As a result, we demonstrate the highest power conversion efficiency (13.3%) reported among CQD solar cells.

scholarly journals Theranostic Platforms Based on Silica and Magnetic Nanoparticles Containing Quinacrine, Chitosan, Fluorophores, and Quantum Dots

2022 ◽  
Vol 23 (2) ◽  
pp. 932
Author(s):  
Dmitry V. Korolev ◽  
Galina A. Shulmeyster ◽  
Natalia V. Evreinova ◽  
Maria S. Syrovatkina ◽  
Maria S. Istomina ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Surface Modification ◽  
Magnetic Nanoparticles ◽  
Indocyanine Green ◽  
Colloidal Quantum Dots ◽  
Diagnosis And Treatment ◽  
Secondary Radiation ◽  
Laboratory Animals ◽  
Chitosan Coating ◽  
Radiation Sources

In this paper, we describe the synthesis of multilayer nanoparticles as a platform for the diagnosis and treatment of ischemic injuries. The platform is based on magnetite (MNP) and silica (SNP) nanoparticles, while quinacrine is used as an anti-ischemic agent. The synthesis includes the surface modification of nanoparticles with (3-glycidyloxypropyl)trimethoxysilane (GPMS), the immobilization of quinacrine, and the formation of a chitosan coating, which is used to fix the fluorophore indocyanine green (ICG) and colloidal quantum dots AgInS2/ZnS (CQDs), which serve as secondary radiation sources. The potential theranostic platform was studied in laboratory animals.

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...

scholarly journals Introduction to special issue: Colloidal quantum dots

2020 ◽  
Vol 153 (24) ◽  
pp. 240401
Author(s):  
Matthew C. Beard ◽  
Xiaogang Peng ◽  
Zeger Hens ◽  
Emily A. Weiss
Keyword(s):  
Quantum Dots ◽  
Colloidal Quantum Dots ◽  
Special Issue
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