Advances in low-cost infrared imaging using II-VI colloidal quantum dots (Conference Presentation)

2017 ◽  
Author(s):  
Richard E. Pimpinella ◽  
Christopher Buurma ◽  
Anthony J. Ciani ◽  
Christoph H. Grein ◽  
Philippe Guyot-Sionnest
Keyword(s):  
Quantum Dots ◽  
Infrared Imaging ◽  
Low Cost ◽  
Colloidal Quantum Dots

Low-cost II-VI colloidal quantum dots for infrared imaging and detection (Conference Presentation)

2018 ◽  
Author(s):  
Richard E. Pimpinella ◽  
Brendan W. Benapfl ◽  
Thomas Miynarski ◽  
Christoph Grein
Keyword(s):  
Quantum Dots ◽  
Infrared Imaging ◽  
Low Cost ◽  
Colloidal Quantum Dots

scholarly journals Toward Green Optoelectronics: Environmental-Friendly Colloidal Quantum Dots Photodetectors

2021 ◽  
Vol 9 ◽  
Author(s):  
Sijia Miao ◽  
Yuljae Cho
Keyword(s):  
Heavy Metals ◽  
Quantum Dots ◽  
Near Infrared ◽  
Infrared Imaging ◽  
Environmentally Friendly ◽  
Functional Materials ◽  
Building Blocks ◽  
Colloidal Quantum Dots ◽  
Human Beings ◽  
Ambient Conditions

Colloidal quantum dots (CQDs) have attracted tremendous research interests in future-generation energy, electronic, optoelectronic, and bio-imaging applications due to their fascinating material properties, such as solution processability at room temperature and under ambient conditions, compatibility with various functional materials, and high photostability as well as photosensitivity. Among the various optoelectronic applications of CQDs, optical light sensors, which convert photonic energy into electrical signals, have been of particular interest because they are one of the key building blocks for modern communication and imaging applications, including medical X-ray and near-infrared imaging, visible light cameras, and machine vision. However, CQDs, which have been widely researched for photodetectors (PDs) so far, contain toxic and hazardous heavy metals, namely, lead (Pb), cadmium (Cd), and mercury (Hg). These substances are extremely toxic and harmful to the environment as well as human beings. Therefore, it is highly desirable to substitute CQDs containing heavy metals with nontoxic and environmentally friendly ones to realize green optoelectronics. In this review article, we introduce various kinds of heavy metal–free CQDs and their PD applications. This article comprehensively includes working mechanisms of PDs, various kinds of nontoxic and environmentally friendly CQD-based PDs, advanced heterojunction PDs, and discussion for future perspectives.

A Short Analysis on the Morphological Characterization of Colloidal Quantum Dots for Photovoltaic Applications

2020 ◽  
Vol 16 (4) ◽  
pp. 544-555
Author(s):  
Mansoor Ani Najeeb ◽  
Zubair Ahmad ◽  
Sarkarainadar Balamurugan ◽  
Khaulah Sulaiman ◽  
R.A. Shakoor
Keyword(s):  
Quantum Dots ◽  
Low Cost ◽  
Quantum Confinement Effect ◽  
Solar Spectrum ◽  
Morphological Characterization ◽  
Colloidal Quantum Dots ◽  
Morphological Studies ◽  
Photovoltaic Applications ◽  
Future Work

Due to its various advantages, colloidal quantum dots (CQDs) carry a prodigious deal of interest in low-cost photovoltaics. The possibility of tailored band gaps via quantum confinement effect facilitates photovoltaic devices to be tuned to allow their optical absorption bandwidths to match with the solar spectrum. Size, shape, and material composition are some of the significant factors which affect the optical and electronic properties of QDs. Scanning Electron Microscope (SEM), Atomic Force Microscopy (AFM) and Transmission Electron Microscopy (TEM) are some of the most resourceful methods available for the microstructural characteristics of solid materials. These techniques can provide useful information about the structural, morphological and compositional properties of the specimen. In this focused review, we analyze the several types of QDs, their synthesis and characterization, exclusively morphological studies carried out on quantum dots for solar cell applications. Despite various advantages and techniques used for morphological characterization of QDs, very few reviews are reported in the past years. In this review, we have compiled the important and latest findings published on morphological analysis of QDs for photovoltaic applications which can provide the guideline for the research for the future work in the field.

scholarly journals Ag2ZnSnS4–ZnS core–shell colloidal quantum dots: a near-infrared luminescent material based on environmentally friendly elements

2021 ◽  
Author(s):  
Avijit Saha ◽  
Gerasimos Konstantatos
Keyword(s):  
Quantum Dots ◽  
Near Infrared ◽  
Low Cost ◽  
Environmentally Friendly ◽  
Fold Increase ◽  
Colloidal Quantum Dots ◽  
Core Shell ◽  
Luminescent Material ◽  
Bio Imaging

Passivation and optimization of luminescent AZTS QDs with ZnS shells gave rise to a ∼30-fold increase in the PLQY results in RoHS compliant low-cost, bright and tunable NIR-luminescent phosphors for bio-imaging and LED applications.

scholarly journals Electrically control amplified spontaneous emission in colloidal quantum dots

2019 ◽  
Vol 5 (10) ◽  
pp. eaav3140 ◽  
Author(s):  
Junhong Yu ◽  
Sushant Shendre ◽  
Weon-kyu Koh ◽  
Baiquan Liu ◽  
Mingjie Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Spontaneous Emission ◽  
Auger Recombination ◽  
Low Cost ◽  
Amplified Spontaneous Emission ◽  
Edge State ◽  
Equation Model ◽  
Colloidal Quantum Dots ◽  
Lasing Threshold ◽  
Light Amplification

Colloidal quantum dots (CQDs) are highly promising materials for light amplification thanks to their efficient photoluminescence, tunable emission wavelength and low-cost synthesis. Unfortunately, CQDs are suffering from band-edge state degeneracy which demands multiple excitons to achieve population inversion. As a result, non-radiative Auger recombination increases the lasing threshold and limits the gain lifetime. Here, benefiting from the negative charging, we demonstrate that the amplified spontaneous emission (ASE) threshold is controllable in a device where CQD film is exposed to an external electric field. Specifically, singly charged CQDs lower the threshold due to the preexisting electron in the conduction band, while strongly enhanced Auger recombination in doubly charged CQDs stymies the ASE. Experimental results and kinetic equation model show that ASE threshold reduces 10% even if our device only charges ~17% of the CQD population. Our results open new possibilities for controlling exciton recombination dynamics and achieving electrically pumped CQD lasers.

Colloidal quantum dots for low-cost MWIR imaging

2016 ◽  
Author(s):  
Anthony J. Ciani ◽  
Richard E. Pimpinella ◽  
Christoph H. Grein ◽  
Philippe Guyot-Sionnest
Keyword(s):  
Quantum Dots ◽  
Low Cost ◽  
Colloidal Quantum Dots

scholarly journals Dual-band ultraviolet-short-wavelength infrared imaging via luminescent downshifting with colloidal quantum dots

2013 ◽  
Vol 7 (01) ◽  
pp. 1 ◽  
Author(s):  
Scott M. Geyer ◽  
Jennifer M. Scherer ◽  
Michael D. Jack ◽  
Moungi G. Bawendi ◽  
Frank B. Jaworski
Keyword(s):  
Quantum Dots ◽  
Short Wavelength ◽  
Infrared Imaging ◽  
Colloidal Quantum Dots ◽  
Dual Band
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