scholarly journals Nanopyramid With High Purity And Their Local Plasmonic Properties

2021 ◽  
Author(s):  
Man Qiu ◽  
Li Yu
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Quantum Information ◽  
Electric Field ◽  
High Purity ◽  
Room Temperature ◽  
Near Infrared ◽  
Biomedical Science ◽  
Novel Applications ◽  
Mode Volume

Au nanopyramid particles (Au NBPs) are highly desirable for its remarkable optical properties such as long-range tunable resonance. It has wide applications in room-temperature bioimaging probes and bioanalytical sensors. In this paper, we synthesize Au NBPs with a purity of 95%, and obtain the optical response of Au NBP in near infrared regime. We find that Au NBPs have small mode volume of electric field which can lead to the strong coupling with quantum dots at room temperature. It provides novel applications for Au NBPs in fields of materials, biomedical science, and quantum information

Optical Properties of Self-Organized InGaAs/GaAs Quantum Dots in Field-Effect Structures

1998 ◽  
Vol 536 ◽  
Author(s):  
A. Babinski ◽  
T. Tomaszewicz ◽  
A. Wysmolek ◽  
J. M. Baranowski ◽  
C. Lobo ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Low Temperature ◽  
Electric Field ◽  
Field Effect ◽  
Room Temperature ◽  
Applied Bias ◽  
Electric Field Dependence ◽  
Self Organized ◽  
Peak Energy

AbstractThe results of photoluminescence (PL) and electroreflectance (ER) measurements on InGaAs/GaAs self-organized quantum dots (QDs) in field-effect structure are presented. It has been found that the QDs PL can be completely quenched in reversely biased structure both at room temperature and at T=4.2K. A non-monotonic dependence of QDs PL peak energy with applied bias is observed at low temperature, which is attributed to the band-gap re-normalization due to QDs charging and size distribution effects. The electric field dependence of the QDs ER feature at room temperature has been analysed. A red shift of that feature with increasing electric field has been observed.

High-performance near-infrared photodetectors based on C3N quantum dots integrated with single-crystal graphene

2021 ◽  
Author(s):  
Yun Zhao ◽  
Xiaoqiang Feng ◽  
Menghan Zhao ◽  
Xiaohu Zheng ◽  
Zhiduo Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electric Field ◽  
Single Crystal ◽  
High Performance ◽  
Near Infrared ◽  
Fast Response ◽  
Local Electric Field ◽  
Infrared Photodetectors ◽  
Photocurrent Response

Employing C3N QD-integrated single-crystal graphene, photodetectors exhibited a distinct photocurrent response at 1550 nm. The photocurrent map revealed that the fast response derive from C3N QDs that enhanced the local electric field near graphene.

scholarly journals Near-Infrared-Excitable Organic Ultralong Phosphorescence through Multiphoton Absorption

Research ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Ye Tao ◽  
Lele Tang ◽  
Qi Wei ◽  
Jibiao Jin ◽  
Wenbo Hu ◽  
...  
Keyword(s):  
Room Temperature ◽  
Near Infrared ◽  
Emission Feature ◽  
Multiphoton Absorption ◽  
Triplet Excited State ◽  
Room Temperature Phosphorescence ◽  
Two Photon ◽  
Nir Light ◽  
Phosphorescence Quantum Yield ◽  
Novel Applications

Organic ultralong room-temperature phosphorescence (OURTP) with a long-lived triplet excited state up to several seconds has triggered widespread research interests, but most OURTP materials are excited by only ultraviolet (UV) or blue light owing to their unique stabilized triplet- and solid-state emission feature. Here, we demonstrate that near-infrared- (NIR-) excitable OURTP molecules can be rationally designed by implanting intra/intermolecular charge transfer (CT) characteristics into H-aggregation to stimulate the efficient nonlinear multiphoton absorption (MPA). The resultant upconverted MPA-OURTP show ultralong lifetimes over 0.42 s and a phosphorescence quantum yield of ~37% under both UV and NIR light irradiation. Empowered by the extraordinary MPA-OURTP, novel applications including two-photon bioimaging, visual laser power detection and excitation, and lifetime multiplexing encryption devices were successfully realized. These discoveries illustrate not only a delicate design map for the construction of NIR-excitable OURTP materials but also insightful guidance for exploring OURTP-based nonlinear optoelectronic properties and applications.

scholarly journals Fluorine-Doped Tin Oxide Colloidal Nanocrystals

Nanomaterials ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 863 ◽  
Author(s):  
Owen Kendall ◽  
Pierce Wainer ◽  
Steven Barrow ◽  
Joel van Embden ◽  
Enrico Della Gaspera
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Tin Oxide ◽  
Near Infrared ◽  
Transparent Electrode ◽  
High Quality ◽  
Detailed Characterization

Fluorine-doped tin oxide (FTO) is one of the most studied and established materials for transparent electrode applications. However, the syntheses for FTO nanocrystals are currently very limited, especially for stable and well-dispersed colloids. Here, we present the synthesis and detailed characterization of FTO nanocrystals using a colloidal heat-up reaction. High-quality SnO2 quantum dots are synthesized with a tuneable fluorine amount up to ~10% atomic, and their structural, morphological and optical properties are fully characterized. These colloids show composition-dependent optical properties, including the rise of a dopant-induced surface plasmon resonance in the near infrared.

Near Infrared Photoluminescence of NCVSi- Centers in High-Purity Semi-Insulating 4H-SiC Irradiated with Energetic Charged Particles

2020 ◽  
Vol 1004 ◽  
pp. 355-360
Author(s):  
Shin Ichiro Sato ◽  
Takuma Narahara ◽  
Shinobu Onoda ◽  
Yuichi Yamazaki ◽  
Yasuto Hijikata ◽  
...  
Keyword(s):  
High Purity ◽  
Room Temperature ◽  
Near Infrared ◽  
Ion Beam ◽  
High Energy ◽  
Implantation Dose ◽  
Implantation Technique ◽  
Photoluminescence Intensity ◽  
Wide Range ◽  
Excitation Laser

This paper reports optical propertites of negatively charged NCVSi- centers in silicon carbide (a nitrogen substituting for a carbon atom adjacent to a silicon vacancy) whose emission wavlength is 1100-1500 nm at room temperature. High-purity semi-insulating (HPSI) 4H-SiCs are implanted with high energy N ion beams and subsequently thermally annealed to form NCVSi centers. We investigated a wide range of N ion implantation dose using a micro ion beam implantation technique and observed the photoluminescence intensity from the SiC-NV centers. We show that under conditions of heavy implantation, the excitation laser power excites residual defects and their fluorescences intereferes with the emission from the NCVSi- centers. These results allow us to clarify the requirements to optically detect isolated single NCVSi- centers at lightly implanted conditions.

Vapour Sensitivity of InP Surface Quantum Dots

2014 ◽  
Vol 605 ◽  
pp. 177-180 ◽  
Author(s):  
Roberta de Angelis ◽  
Mauro Casalboni ◽  
Liliana D’Amico ◽  
Fabio de Matteis ◽  
Fariba Hatami ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Room Temperature ◽  
Near Infrared ◽  
Surface Recombination ◽  
Surface States ◽  
Infrared Emission ◽  
Polar Solvents ◽  
Solvent Type ◽  
Near Infrared Emission ◽  
Inp Surface

We studied the effect of solvent vapours on the photoluminescent emission of self-assembled InP surface quantum dots (SQDs). Their room temperature near infrared emission undergoes a fully reversible intensity enhancement when the dots were exposed to vapours of polar solvents since polar molecules are likely to be adsorbed onto intrinsic surface states and thus reducing non radiative surface recombination. The shape and position of the emission band does not change. The observed effect is dependent on solvent type and concentration with linear law over a limited concentration range.

Electroluminescence of Hybrid Self-Organised Fibres Incorporating CdTe Quantum Dots

2012 ◽  
Vol 65 (9) ◽  
pp. 1257 ◽  
Author(s):  
Masanori Ando ◽  
Chie Hosokawa ◽  
Ping Yang ◽  
Norio Murase
Keyword(s):  
Quantum Dots ◽  
Electric Field ◽  
Room Temperature ◽  
Low Voltage ◽  
The Self ◽  
Cdte Quantum Dots ◽  
Electroluminescent Devices ◽  
Interdigitated Array Electrodes ◽  
Low Threshold ◽  
Interdigitated Array

We demonstrated electroluminescence from hybrid 1D glass fibres incorporating CdTe quantum dots with a thin SiO2 overlayer which contains CdS-like clusters. The self-organised fibres, prepared by refluxing precursor nanowires, exhibited red electroluminescence on Au interdigitated array electrodes at room temperature. Although fluctuation with time was observed in the electroluminescence, relatively low threshold electric field (2.6 × 106 V m–1) suggests that the CdTe quantum dots-based hybrid fibres are expected to be applied to low voltage driven electroluminescent devices.

scholarly journals Impact of reaction variables and PEI/l-cysteine ratio on the optical properties and cytocompatibility of cationic Ag2S quantum dots as NIR bio-imaging probes

RSC Advances ◽  
2016 ◽  
Vol 6 (81) ◽  
pp. 77644-77654 ◽  
Author(s):  
Fatma Demir Duman ◽  
Rouhullah Khodadust ◽  
Emek Goksu Durmusoglu ◽  
Mustafa Baris Yagci ◽  
Havva Yagci Acar
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Penetration Depth ◽  
Fluorescent Probes ◽  
Near Infrared ◽  
Semiconductor Quantum Dots ◽  
Imaging Probes ◽  
Bio Imaging ◽  
Ag2s Quantum Dots

Near-infrared emitting semiconductor quantum dots (NIRQDs) are popular fluorescent probes due to better penetration depth and elimination of tissue autofluorescence.

Growth and Magneto-Optical Properties of CaTbAlO4 Crystal

2011 ◽  
Vol 306-307 ◽  
pp. 1722-1727 ◽  
Author(s):  
Man Mei ◽  
Li Li Cao ◽  
Yan He ◽  
Ru Ru Zhang ◽  
Fei Yun Guo ◽  
...  
Keyword(s):  
Optical Properties ◽  
Single Crystal ◽  
Room Temperature ◽  
Near Infrared ◽  
Visible Region ◽  
Czochralski Method ◽  
Optical Devices ◽  
X Ray Diffraction ◽  
X Ray ◽  
Infrared Spectral

The calcium terbium aluminate (CaTbAlO4) single crystal was grown by Czochralski method successfully for the first time.The structure of the crystal was determined by X-ray diffraction analysis.The transmission spectrum of the crystal was measured at room temperature at the wavelength of 400-1500nm.The specific Faraday rotation of the single crystal was surveyed at room temperature at the wavelength 532nm, 633nm, and 1064nm respectively.The Verdet constants of the CaTbAlO4 crystal are calculated and the results show that the Verdet constants of CaTbAlO4 are around 110% higher than that of TGG in the visible and near-infrared spectral region.Therefore,crystal CaTbAlO4 can be promising material for the fabrication of magneto-optical devices in the visible region.

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