Top Research Papers on Quantum Dots

Abstract Worldwide, enormous efforts are directed toward the development of the so‐called quantum internet. Turning this long‐sought‐after dream into reality is a great challenge that will require breakthroughs in quantum communication and computing. To establish a global, quantum‐secured communication infrastructure, photonic quantum technologies will doubtlessly play a major role, by providing and interfacing essential quantum resources, for example, flying‐ and stationary qubits or quantum memories. Over the last decade, significant progress has been made in the engineering of on‐demand qua...

The great potential of quantum dots (QDs) in photonic quantum information technology is discussed in depth and modern methods and technical solutions for the epitaxial growth and for the deterministic nanoprocessing of quantum devices based on QDs are presented.

We report semiconductor nanocrystals represent a promising class of solution-processable optical-gain media that can be manipulated via inexpensive, easily scalable colloidal techniques. Due to their extremely small sizes (typically <10 nm), their properties can be directly controlled via effects of quantum confinement; therefore, they are often termed colloidal quantum dots (CQDs). In addition to size-tunable emission wavelengths, CQDs offer other benefits for lasing applications, including low optical-gain thresholds and high temperature stability of lasing characteristics. Recent progres...

The proposed facile strategy to control the preparation of graphdiyne quantum dots (GDY-Py QDs), in which pyrene groups are covalently linked to GDY by Sonogashira cross-coupling reaction are bestowed with high stability and non-cytotoxicity and exhibit long fluorescent time, which could offer great potential in optical imaging and biomedical application.

A materials-chemistry perspective for colloidal quantum dots (QDs) in the field of display, including QD-enhanced liquid-crystal-display (QD-LCD) and Qd-based light-emitting-diodes (QLEDs) display is offered.

Methods for the chemical control of Auger recombination and Auger cooling are discussed in the context of how they illuminate the underlying mechanisms, and the current understanding of carrier multiplication in quantum dots is examined.

The development of electronics is increasingly dependent on low-cost, flexible, solution-processed semiconductors. Colloidal quantum dots are solution-processed semiconducting nanocrystals that have a size-tunable bandgap and can be fabricated on a range of substrates. Here we review developments in colloidal quantum dot electronics, focusing on luminescent, optoelectronic, memory and thermoelectric devices. We examine the role of surface chemistry in the suppression of non-radiative processes, the control of light–matter interactions and the regulation of carrier transport properties. We also...

This work embeds GaAs quantum dots into an n-i-p-diode specially designed for low-temperature operation and demonstrates ultra-low noise behaviour: charge control via Coulomb blockade, close-to lifetime-limited linewidths, and no blinking.

This research presents a new generation of high-performance quantum light sources based on semiconductor quantum dots coupled to microcavities that show their promise in long-distance solid-state quantum networks.

The attributes of QDs for optically addressable qubits in emerging quantum computation, sensing, simulation, and communication technologies are considered, e.g., as robust sources of indistinguishable, single photons that can be integrated into photonic structures to amplify, direct, and tune their emission or as hosts for isolated, coherent spin states thatCan be coupled to light or to other spins in QD arrays.

The researchers in the community is expected to foresee the great potential of CDots, and focus on the critical results obtained during the development of TQDs, paying special attention to the profound principles behind the synthetic chemistry, luminescence mechanisms and applications.

Optical energy can be transformed into electricity, photons, and chemical bonds using colloidal quantum dots as the scaffold.

In terms of their use in displays, quantum dots (QDs) exhibit several advantages, including high illumination efficiency and color rendering, low-cost, and capacity for mass production. Furthermore, they are environmentally friendly. Excellent luminescence and charge transport properties of QDs led to their application in QD-based light-emitting diodes (LEDs), which have attracted considerable attention in display and solid-state lighting applications. In this review, we discuss the applications of QDs which are used on color conversion filter that exhibit high efficiency in white LEDs, full-c...

The therapeutic, drug delivery, biosensing and bioimaging applications of GQDs are described and it is presumed that drug-GQD duo would be the next generation strategy for many unresolved therapeutic hurdles.

Perovskite light-emitting diodes (PeLEDs) with an external quantum efficiency exceeding 20% have been achieved in both green and red wavelengths 1-5 ; however, the performance of blue-emitting PeLEDs lags behind 6,7 . Ultrasmall CsPbBr 3 quantum dots are promising candidates with which to realize efficient and stable blue PeLEDs, although it has proven challenging to synthesize a monodispersed population of ultrasmall CsPbBr 3 quantum dots, and difficult to retain their solution-phase properties when casting into solid films 8 . Here we report the direct synthesis-on-substrate of films of suit...

Electrons and holes confined in quantum dots define excellent building blocks for quantum emergence, simulation, and computation. Silicon and germanium are compatible with standard semiconductor manufacturing and contain stable isotopes with zero nuclear spin, thereby serving as excellent hosts for spins with long quantum coherence. Here, we demonstrate quantum dot arrays in a silicon metal-oxide-semiconductor (SiMOS), strained silicon (Si/SiGe), and strained germanium (Ge/SiGe). We fabricate using a multi-layer technique to achieve tightly confined quantum dots and compare integration process...

Photocatalysis is a cutting-edge technology with the potential to solve environmental pollution and energy crisis. In recent years, the great advantages of semiconductor quantum dots in the field of photocatalysis have attracted widespread attention, such as excellent visible light absorption, multi-exciton effect, surface effect and adjustable energy bands. Semiconductor quantum dots have indeed met people's expectations in the field of photocatalysis and have been successfully used in hydrogen production, CO2 reduction, pollutant degradation and other fields. This review focuses on the uniqu...

This review explores the applications of CQDs in bioimaging and biomedicine, highlighting recent advancements and future possibilities to increase interest in their numerous advantages for therapeutic applications.

Zero-dimensional (0D) carbon quantum dots (CQDs), as a nanocarbon material in the carbon family, have garnered increasing attention in recent years due to their outstanding features of low cost, nontoxicity, large surface area, high electrical conductivity, and rich surface functional groups. By virtue of their rapid electron transfer and large surface area, CQDs also emerge as promising functional materials for the applications in energy-conversion sectors through electrocatalysis. Besides, the rich functional groups on the surface of CQDs offer abundant anchoring sites and active sites for t...

The engineering concerning surface ligands, additives, and hybrid composition for PQ DSCs is outlined first, followed by analyzing the reasons of undesired performance of PQDSCs and some challenges and perspectives concerning PQDs are discussed.

Photonic quantum technology provides a viable route to quantum communication 1,2 , quantum simulation 3 and quantum information processing 4 . Recent progress has seen the realization of boson sampling using 20 single photons 3 and quantum key distribution over hundreds of kilometres 2 . Scaling the complexity requires architectures containing multiple photon sources, photon counters and a large number of indistinguishable single photons. Semiconductor quantum dots are bright and fast sources of coherent single photons 5-9 . For applications, a roadblock is the poor quantum coherence on interf...

This field study highlights that quantum-dot entangled photon sources are ready to go beyond laboratory experiments, thus opening the way to real-life quantum communication.

This work demonstrates the viability of quantum dots as light sources for entanglement-based quantum key distribution and quantum networks, and increases the excitation rate and embedding the dots in state-of-the-art photonic structures, key generation rates in the gigabits per second range are in principle at reach.

Carbon quantum dots (CQDs) are a class of carbon nanomaterials that have recently gained recognition as current entrants to traditional semiconductor quantum dots. CQDs have the desirable advantages of low toxicity, environmental friendliness, low cost, photostability, favorable charge transfer with enhanced electronic conductivity, and comparable easy-synthesis protocols. This review examines the advancements in CQD research and development, with a focus on their synthesis, functionalization, and energy applications. Initially, various synthesis methods are discussed briefly with pros and con...

Carbon quantum dots are a novel form of carbon material. They offer numerous benefits including particle size adjustability, light resistance, ease of functionalization, low toxicity, excellent biocompatibility, and high-water solubility, as well as their easy accessibility of raw materials. Carbon quantum dots have been widely used in various fields. The preparation methods employed are predominantly top-down methods such as arc discharge, laser ablation, electrochemical and chemical oxidation, as well as bottom-up methods such as templates, microwave, and hydrothermal techniques. This articl...

Abstract Semiconductor nanocrystals, the so‐called quantum dots (QDs), exhibit versatile optical and electrical properties. However, QDs possess high density of surface defects/traps due to the high surface‐to‐volume ratio, which act as nonradiative carrier recombination centers within the QDs, thereby deteriorating the overall solar cell performance. The surface passivation of QDs through the growth of an outer shell of different materials/compositions called “core/shell QDs” has proven to be an effective approach to reduce the surface defects and confinement potential, which can enable the b...

GQDs constitute discrete features such as acting as attractive fluorophores and excellent electro-catalysts owing to their photo-stability, water-solubility, biocompatibility, non-toxicity and lucrativeness that make them favorable candidates for a wide range of novel biomedical applications.

Quantum dot light-emitting diodes (QD-LEDs) are one of the most promising self-emissive displays in terms of light-emitting efficiency, wavelength tunability, and cost. Future applications using QD-LEDs can cover a range from a wide color gamut and large panel displays to augmented/virtual reality displays, wearable/flexible displays, automotive displays, and transparent displays, which demand extreme performance in terms of contrast ratio, viewing angle, response time, and power consumption. The efficiency and lifetime have been improved by tailoring the QD structures and optimizing the charg...

Carbon quantum dots (CQDs) are fluorescent carbon nanomaterials with unique optical and structural properties that have drawn extensive attention from researchers in the past few decades. Environmental friendliness, biocompatibility and cost effectiveness of CQDs have made them very renowned in countless applications including solar cells, white light-emitting diodes, bio-imaging, chemical sensing, drug delivery, environmental monitoring, electrocatalysis, photocatalysis and other related areas. This review is explicitly dedicated to the stability of CQDs under different ambient conditions. St...

ADVERTISEMENT RETURN TO ISSUEPREVEditorialNEXTQuantum Dots and Their Applications: What Lies Ahead?Mônica A. Cotta*Mônica A. CottaInstitute of Physics "Gleb Wataghin", University of Campinas, Campinas, São Paulo 13083-859, Brazil*Email: [email protected]More by Mônica A. Cottahttp://orcid.org/0000-0002-2779-5179Cite this: ACS Appl. Nano Mater. 2020, 3, 6, 4920–4924Publication Date (Web):June 26, 2020Publication History Published online26 June 2020Published inissue 26 June 2020https://pubs.acs.org/doi/10.1021/acsanm.0c01386https://doi.org/10.1021/acsanm.0c01386editorialACS PublicationsCopyright...

This review attempts to report and analyze the cytotoxicity of the major QDs along with relevant related aspects and suggests that several types of QDs may be suitable for use in biomedical applications if the barrier of cytot toxicity can be resolved.

This demonstration of Nagaoka ferromagnetism highlights that quantum simulators can be used to study physical phenomena that have not yet been observed in any experimental system and constitutes an important step towards large-scale quantum dot simulators of correlated electron systems.

The latest advances in the application of Nir QDs in preclinical settings are discussed, together with the synthetic approaches and material developments that make NIR QDs promising for future biomedical applications.

Various functionalization and surface modification makes quantum dots suitable for application in pharmaceutical field such as biomedical imaging, drug delivery, drug release study and diagnosis, and the regulatory status of quantum dots is not yet clear.

Synthetic methods of QDs from low cost and natural resources.

Since the advent of photocatalytic technology, scientists have been searching for semiconductor materials with high efficiency in solar energy utilization and conversion to chemical energy. Recently, the development of quantum dot (QD) photocatalysts has attracted much attention because of their unique characteristics: small size, quantum effects, strong surface activity, and wide photoresponse range. Among ternary chalcogenide semiconductors, CuInS 2 QDs are increasingly examined in the field of photocatalysis due to their high absorption coefficients, good matching of the absorption range wi...

Abstract Quantum dot (QD) solar cells, benefiting from unique quantum confinement effects and multiple exciton generation, have attracted great research attention in the past decades. Before 2016, research efforts were mainly devoted to solar cells comprising lead chalcogenide QDs, while lead halide perovskite QDs have recently emerged as a rising star in the field. This review aims to compare similarities and differences between lead chalcogenide and lead halide perovskite QDs for photovoltaic applications. The fundamental physical properties of these two types of nanomaterials and their stat...

This work focuses on the recent development of wet-chemistry protocols and various precursor materials for the synthesis and surface modification of InP QDs, and current methods for constructing light-emitting diodes using novel InP-based QDs.

The universal electron-donating/withdrawing group engineering approach for synthesizing tunable emissive CQDs will facilitate the progress of carbon-based luminescent materials for manufacturing forward-looking films and devices.

This review reports on some recent methods for the synthesis of QDs and explores their properties, structures, applications, and toxicity, which are an attractive material for a variety of scientific and commercial applications.