Synthesis of cationic quantum dots via a two-step ligand exchange process

2011 ◽  
Vol 47 (11) ◽  
pp. 3069 ◽  
Author(s):  
Yi-Cheun Yeh ◽  
Debabrata Patra ◽  
Bo Yan ◽  
Krishnendu Saha ◽  
Oscar R. Miranda ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Ligand Exchange ◽  
Exchange Process

scholarly journals Recent Research Progress in Surface Ligand Exchange of PbS Quantum Dots for Solar Cell Application

2020 ◽  
Vol 10 (3) ◽  
pp. 975 ◽  
Author(s):  
Hyung Ryul You ◽  
Jin Young Park ◽  
Duck Hoon Lee ◽  
Younghoon Kim ◽  
Jongmin Choi
Keyword(s):  
Quantum Dots ◽  
Solid State ◽  
Ligand Exchange ◽  
Exchange Process ◽  
Surface States ◽  
Solution Phase ◽  
Research Progress ◽  
Solar Cell Application ◽  
Exchange Processes ◽  
Particle Size And Shape

Colloidal quantum dots (CQDs) are considered as next-generation semiconductors owing to their tunable optical and electrical properties depending on their particle size and shape. The characteristics of CQDs are mainly governed by their surface chemistry, and the ligand exchange process plays a crucial role in determining their surface states. Worldwide studies toward the realization of high-quality quantum dots have led to advances in ligand exchange methods, and these procedures are usually carried out in either solid-state or solution-phase. In this article, we review recent advances in solid-state and solution-phase ligand exchange processes that enhance the performance and stability of lead sulfide (PbS) CQD solar cells, including infrared (IR) CQD photovoltaics.

Surface Passivation of Luminescent Colloidal Quantum Dots with Poly(Dimethylaminoethyl methacrylate) through a Ligand Exchange Process

2004 ◽  
Vol 126 (25) ◽  
pp. 7784-7785 ◽  
Author(s):  
Xiao-Song Wang ◽  
Tieneke E. Dykstra ◽  
Mayrose R. Salvador ◽  
Ian Manners ◽  
Gregory D. Scholes ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Ligand Exchange ◽  
Surface Passivation ◽  
Exchange Process ◽  
Colloidal Quantum Dots ◽  
Dimethylaminoethyl Methacrylate

Hybrid perovskite exchange of PbS quantum dots for fast and high-detectivity visible–near-infrared photodetectors

2020 ◽  
Vol 8 (23) ◽  
pp. 7812-7819
Author(s):  
Longfei Mi ◽  
Yajing Chang ◽  
Yan Zhang ◽  
Enze Xu ◽  
Yang Jiang
Keyword(s):  
Quantum Dots ◽  
Ligand Exchange ◽  
High Performance ◽  
Near Infrared ◽  
Exchange Process ◽  
Infrared Photodetectors ◽  
Hybrid Perovskite ◽  
Pbs Quantum Dots

A hybrid perovskite decorated with PbS-QDs by using a ligand exchange process to fabricate high-performance photodetectors.

In situ ligand exchange of thiol-capped CuInS2/ZnS quantum dots at growth stage without affecting luminescent characteristics

2011 ◽  
Vol 363 (2) ◽  
pp. 703-706 ◽  
Author(s):  
Hyunki Kim ◽  
Minwon Suh ◽  
Byung-Hwa Kwon ◽  
Dong Seon Jang ◽  
Sung Wook Kim ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Ligand Exchange ◽  
Growth Stage

scholarly journals Ligand-Length Modification in CsPbBr3 Perovskite Nanocrystals and Bilayers with PbS Quantum Dots for Improved Photodetection Performance

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1297 ◽  
Author(s):  
Juan Navarro Arenas ◽  
Ananthakumar Soosaimanickam ◽  
Hamid Pashaei Adl ◽  
Rafael Abargues ◽  
Pablo P. Boix ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Surface Chemistry ◽  
Optical Sensors ◽  
Ligand Exchange ◽  
Near Infrared ◽  
Future Internet ◽  
Single Step ◽  
Perovskite Nanocrystals ◽  
Internet Of Things Technology ◽  
Pbs Quantum Dots

Nanocrystals surface chemistry engineering offers a direct approach to tune charge carrier dynamics in nanocrystals-based photodetectors. For this purpose, we have investigated the effects of altering the surface chemistry of thin films of CsPbBr3 perovskite nanocrystals produced by the doctor blading technique, via solid state ligand-exchange using 3-mercaptopropionic acid (MPA). The electrical and electro-optical properties of photovoltaic and photoconductor devices were improved after the MPA ligand exchange, mainly because of a mobility increase up to 5 × 10−3 cm 2 / Vs . The same technology was developed to build a tandem photovoltaic device based on a bilayer of PbS quantum dots (QDs) and CsPbBr3 perovskite nanocrystals. Here, the ligand exchange was successfully carried out in a single step after the deposition of these two layers. The photodetector device showed responsivities around 40 and 20 mA/W at visible and near infrared wavelengths, respectively. This strategy can be of interest for future visible-NIR cameras, optical sensors, or receivers in photonic devices for future Internet-of-Things technology.

Multifunctional silicone nanocomposites for advanced LED encapsulation

2013 ◽  
Vol 1547 ◽  
pp. 161-166 ◽  
Author(s):  
Ying Li ◽  
Peng Tao ◽  
Richard W. Siegel ◽  
Linda S. Schadler
Keyword(s):  
Ligand Exchange ◽  
High Efficiency ◽  
Extraction Efficiency ◽  
Exchange Process ◽  
Polymer Brush ◽  
High Refractive Index ◽  
Inorganic Nanoparticles ◽  
Light Extraction Efficiency ◽  
Yellow Emission ◽  
Color Conversion

ABSTRACTThe addition of high refractive index (RI) inorganic nanoparticles (NPs) to LED encapsulation materials can lead to higher light extraction efficiency. In addition, the NPs can be carriers for additional functionality such as color conversion. Using a simple “grafting-to” approach, bimodal polydimethylsiloxane (PDMS) brushes were grafted onto high-RI ZrO2 NPs. Subsequently, an organic phosphor, 6-[fluorescein-5(6)-carboxamido]hexanoic acid (FCHA), was attached onto the PDMS-grafted ZrO2 NPs via a facile ligand exchange process. The bimodal polymer brush design enables homogenous dispersion of the surface functionalized NPs within the silicone matrix. The functionalized NPs with ∼53 wt% ZrO2 core have a ∼0.08 higher RI than neat silicone, and the NP-filled silicone nanocomposites exhibit a transparency of ∼ 90% in the 550-800 nm wavelength range. In addition, the nanocomposites could be excited at a wavelength around 455 nm by a blue LED and undergo secondary yellow emission at around 571 nm. It is expected that the prepared nanocomposites can be used as high-efficiency, non-scattering, color-tuned materials for advanced LED encapsulation.

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