A5013211207- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- GaN-based semiconductor devices and materials
- Photonic Crystals and Applications
- Photonic and Optical Devices
- Nanocluster Synthesis and Applications
- Perovskite Materials and Applications
- Ga2O3 and related materials
- ZnO doping and properties
- Semiconductor Quantum Structures and Devices
- Plasmonic and Surface Plasmon Research
- Optical Coatings and Gratings
- Nonlinear Optical Materials Studies
- Semiconductor materials and devices
- Nanowire Synthesis and Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Semiconductor Lasers and Optical Devices
- Advanced biosensing and bioanalysis techniques
- Silicon Nanostructures and Photoluminescence
- Photocathodes and Microchannel Plates
- Microfluidic and Bio-sensing Technologies
- Liquid Crystal Research Advancements
- Optical Network Technologies
- Analytical Chemistry and Sensors
- Neuroscience and Neural Engineering
Nanjing Institute of Environmental Sciences
2024
Ministry of Ecology and Environment
2024
Pennsylvania State University
2013-2023
Lianyungang Oriental Hospital
2022
Nanjing Medical University
2022
Harbin Institute of Technology
2020
Ministry of Industry and Information Technology
2020
Jinan University
2019
University of Shanghai for Science and Technology
2011-2015
Park University
2015
Garlic was used as a green source to synthesize carbon dots (CDs) with systematic study of the optical and structure properties. Ethylenediamine added into synthesis improve photoluminescence quantum yield (PL QY) CDs. Detailed structural composition studies demonstrated that content N formation C-N C=N were critical PL QY. The as-synthesized CDs exhibited excellent stability in wide pH range high NaCl concentrations, rendering them applicable complicated harsh conditions. Quenching...
We report a hybrid photovoltaic cell where PbSe nanocrystals were used to sensitize the conjugated polymer into infrared. The device exhibited an incident monochromatic photon current conversion efficiency of 1.3% at λ=805nm. Under 1 sun AM 1.5 illumination, infrared response (780nm<λ<1600nm) embedded contributes 33% overall photocurrent cell. observed intensity dependences photocurrents have revealed pseudomonomolecular recombination kinetics in nanocrystal quantum dot...
We report in this communication the design and fabrication of solution-processed white light-emitting diodes (LEDs) containing a bilayer heavy metal-free colloidal quantum dots (QDs) polymer device active region. White electroluminescence was obtained LEDs by mixing red emission ZnCuInS/ZnS core/shell QDs blue-green poly(N,N'-bis(4-butylphenyl)-N,N'-bis(phenyl)benzidine). A high color rendering index 92 achieved as compared to 5310 K blackbody reference virtue broadband QDs. The Commission...
We report a multilayer solution-processed blue light-emitting diode based on colloidal core/shell CdS/ZnS nanocrystal quantum dots (QDs). At low-operating voltage of 5.5 V, the device emits spectrally pure radiation at 460 nm with narrow full-width-at-half-maximum bandwidth 20 and high brightness up to 1600 cd/m2. Broad-band, long-wavelength emission from polymer components deep traps in QDs are minimized less than 5% total emission.
The first observation of near-band-edge electroluminescent emission from the colloidal quantum dots (QDs) consisting CuInS2-ZnS alloyed (ZCIS) cores and ZnSe/ZnS double shells is reported. Bright organic-free electroluminescence (EL) peaked at red (λ = 623 nm), yellow 594 green 560 nm) wavelengths observed heavy-metal-free QD light-emitting diodes (QD-LEDs). onset voltages, luminance output uniformity, efficiencies QD-LEDs are characterized.
A three-band white light-emitting diode (LED) was fabricated using an InGaN-based blue LED chip that emits 460-nm light, and a green phosphor SrGa/sub 2/S/sub 4/ : Eu/sup 2+/ red Ca/sub 1-x/Sr/sub x/S emit 535-nm 615-nm emissions, respectively, when excited by light. When the operated in direct current (DC) 20 mA at room temperature, Commission Internationale de l'Eclairage chromaticity coordinate (x, y), color temperature Tc, rendering index Ra are calculated to be (0.3236, 0.3242), 5937 K,...
We demonstrate that a high-intensity electron beam can be applied to create holes, gaps, and other patterns of atomic nanometer dimensions on single nanowire, weld individual nanowires form metal-metal or metal-semiconductor junctions, remove the oxide shell from crystalline nanowire. In single-crystalline Si nanowires, induces instant local vaporization amorphization. metallic Au, Ag, Cu, Sn rapid surface melting enhanced diffusion, in addition vaporization. These studies open up novel...
Abstract Hybrid thin films of conjugated polymers and CdSe nanoparticles have been fabricated by using a layer‐by‐layer (LbL) approach driven covalent coupling reactions. This method permits facile crosslinking the polymer/nanoparticle interlayers in common organic solvents, which provides general route for preparing robust uniform functional films. The deposition process is linearly related to number bilayers as monitored UV‐vis absorption spectroscopy ellipsometry. Characterization...
We report in this communication the two-photon absorption (TPA)-induced room-temperature lasing performance of ZnO nanowires.Under femtosecond pulse-excitation at λ = 700 nm infrared regime, a remarkably low threshold 160µJ/cm 2 was observed for TPA-induced action, which is same order magnitude as that measured linear process.Time-resolved photoluminescence characterization pumped nanowires reveals presence fast decay (3-4 ps) stimulated emission compared to slow (50-70 spontaneous...
Al x Ga 1−x N (0⩽x⩽1) ultraviolet photoconductors with cutoff wavelengths from 365 to 200 nm have been fabricated and characterized. The maximum detectivity reached 5.5×108 cmHz1/2/W at a modulating frequency of 14 Hz. effective majority carrier lifetime in AlxGa1−xN materials, derived frequency-dependent photoconductivity measurements, has estimated be 6 35 ms. noise spectrum shows that it is dominated by Johnson high frequencies for low-Al-composition samples.
In this letter, we report a mist-deposition process for the assembly and patterning of nanocrystal quantum dots (NQDs) during fabrication dot light emitting diodes (QD-LEDs), which allows tight controls over thickness, surface morphology, composition, resolution NQD emissive layers. A defect-free featuring uniform brightness QD-LED containing mist-deposited CdSe(ZnS) layer was demonstrated. Additionally, technique successive mist deposition multicolor NQDs through set registered shallow...
The authors report on the design, fabrication, and characterization of 1.55μm Si-based photonic crystal microcavity light emitters utilizing PbSe quantum dots. Efficient coupling emission from dots to Si membrane is achieved by inserting in a central air hole microcavity. Enhancement spontaneous with linewidth ∼2.0nm observed at 1550nm room temperature. Purcell factor are estimated be 35 0.04, respectively.
High-quality InP/ZnS core-shell nanocrystal quantum dots (NQDs) were synthesized as a heavy-metal-free alternative to the gain media of cadmium-based colloidal nanoparticles. Upon UV excitation, amplified spontaneous emission (ASE) and optical observed, for first time, in close-packed NQDs. The ASE wavelength can be selected by tailoring size over broad range spectrum. Moreover, profile NQDs was matched second order feedback holographic polymer-dispersed liquid crystal gratings, leading very...
Design and fabrication of monolithically integrated III-nitride visible light-emitting-diodes (LEDs) ultraviolet Schottky barrier-photodetectors (SB-PDs) have been proposed demonstrated. Responsivity up to 0.2 AW−1 at 365 nm for GaN SB-PDs has achieved. It is shown that those UV were capable sensitive light detection down 7.16×10−4 W/cm2 nm, whereas simultaneous operation on-chip blue LEDs produced negligible crosstalk practical illumination brightness. Monolithically can function as...
We utilized a novel ratiometric nanoquantum dot fluorescence resonance energy transfer (NQD-FRET) optical sensor to quantitatively measure oxygen dynamics from single cell microdomains during hypoxic episodes as well 4-aminopyridine (4-AP)-induced spontaneous seizure-like events in rat hippocampal slices. Coupling sensing with electrical recordings, we found the greatest reduction O2 concentration ([O2]) densely packed body stratum (st.) pyramidale layer of CA1 and differential...
We report in this paper the development of a novel laser-transfer scheme to integrate laterally arrays light-emitting pixels made semiconductor nanocrystal quantum dots (NQDs). The composition and size can be tailored such that luminescence emission each device pixel constitutes distinctive spectral channel narrow bandwidth. An ultrathin film photosensitive triazene polymer (TP) has been employed as sacrificial layer whose decomposition upon UV excitation delivers bilayer structure metal...
We report on a cell-based biosensor application that utilizes patterned single-cell arrays combined with confocal Raman spectroscopy to observe the time-dependent drug response of individual cells in real time. The platform enables be easily located and continuously addressable for characterization biochemical compositional changes non-destructive, quantitative manner so discrete cellular behavior cell-to-cell variations are preserved. In this study, human medulloblastoma (DAOY) were exposed...
We report the demonstration of mechanically flexible quantum dot light emitting diodes (QD-LEDs) all three primary colors (red, green, and blue). The QD-LEDs have been fabricated over poly(ethylene-terephthalate) substrates exhibited high brightness, saturated colors, pronounced flexibility with a critical bending radius ∼5 mm. efficiencies are comparable devices on rigid substrates, suggesting intrinsic dot-based optoelectronic devices.