A5078178740- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Nanocluster Synthesis and Applications
- Semiconductor Quantum Structures and Devices
- Perovskite Materials and Applications
- Semiconductor Lasers and Optical Devices
- Organic Light-Emitting Diodes Research
- Photonic Crystals and Applications
- Carbon and Quantum Dots Applications
- Photonic and Optical Devices
- Advanced Semiconductor Detectors and Materials
- GaN-based semiconductor devices and materials
- Near-Field Optical Microscopy
- ZnO doping and properties
- CCD and CMOS Imaging Sensors
- Luminescence and Fluorescent Materials
- Gas Sensing Nanomaterials and Sensors
- Integrated Circuits and Semiconductor Failure Analysis
- Molecular Junctions and Nanostructures
- Nanowire Synthesis and Applications
- Nonlinear Optical Materials Studies
- Advanced biosensing and bioanalysis techniques
- Spectroscopy Techniques in Biomedical and Chemical Research
- Electromagnetic Compatibility and Measurements
- Green IT and Sustainability
STMicroelectronics (France)
2021-2024
Brunel University of London
2014
Yale University
2012
Massachusetts Institute of Technology
2003-2008
Institute for Soldier Nanotechnologies
2004-2006
Georgetown University
2004
Case Western Reserve University
2004
Oberlin College
2004
IIT@MIT
2004
Large area (mm 2 in size) infrared electroluminescent devices are demonstrated using colloidally grown PbSe quantum dots (QDs) organic host materials. By changing the QD size electroluminescence is tuned from λ = 1.33–1.56 μm. The fabrication of this light‐emitting device (see Figure) combines thin film processing techniques available to materials with tunable optical properties QDs.
Out of the blue: (CdS)ZnS nanocrystals suitable for display applications have been prepared and exhibit a narrow, blue luminescence from 460 to 480 nm (FWHM ≤28 nm; see picture), with quantum efficiencies 20–30 %. It is possible demonstrate electroluminescence these core–shell by embedding them in an organic thin-film device.
We demonstrate a solvent-free contact printing process for deposition of patterned and unpatterned colloidal quantum dot (QD) thin films as the electroluminescent layers within hybrid organic-QD light-emitting devices (QD-LEDs). Our method benefits from simplicity, low cost, high throughput solution-processing methods, while eliminating exposure device structures to solvents. Because charge transport in organic/inorganic QD-LEDs consist solvent-sensitive organic films, ability avoid solvent...
On the basis of evidence from 31P NMR spectroscopy, and using PbSe as a model, we propose two simultaneous mechanisms through which "monomers" are formed in preparations lead chalcogenide nanocrystals (NCs). In one mechanism, selenium is delivered Se2- species, whereas other, Se0 reacts with metal already reduced by organophosphine. This latter mechanism helps explain sensitivity NC to purity organophosphines allows rational modification batch reactions increase yield.
We investigate a new method for forming large-area (> cm2) ordered monolayers of colloidal nanocrystal quantum dots (QDs). The QD thin films are formed in single step by spin-casting mixed solution aromatic organic materials and aliphatically capped QDs. two different phase separate during solvent drying, predefined set conditions the QDs can assemble into hexagonally close-packed crystalline domains. demonstrate robustness flexibility this phase-separation process, as well how properties...
Green to the core: CdxZn1−xSe alloy core nanocrystals are synthesized and overcoated with CdyZn1−yS create core–shell ideal wavelength of emission for quantum dot light-emitting device (QD-LED) displays. These (CdxZn1−xSe)CdyZn1−yS used fabricate color-saturated green-emitting QD-LEDs (see picture), which suitable display applications.
Silica microspheres coated with a silica or titania shell containing fluorescent semiconductor nanocrystals are described. Since the coating process does not affect monodispersity of microspheres, defined size and emission wavelength, potentially useful for biological applications, can be fabricated. The Figure shows 100 nm diameter blue-light-emitting 500 red-light-emitting circulating in brain mouse.
We demonstrate tunable room-temperature amplified spontaneous emission and lasing from blue-emitting core-shell CdS∕ZnS nanocrystals (NCs) stabilized in a sol-gel derived silica matrix. Variable stripe length measurements show that these NC-silica composites have modal gain of ∼100cm−1 at room temperature. Coating microspheres with composite film via facile process resulted uniform resonators exhibit over long periods continuous excitation. This work opens up spectral window for tunable,...
Quantum dots (QDs) are now on the verge of widespread adoption in display applications, after 25 years scientific research and over a decade commercialization efforts. This is result combination industry trends such as liquid crystal displays (LCDs) light emitting diode (LED) backlight units (BLUs), combined with improvements QD performance manufacturing that have taken place across growing ecosystem Universities, National Labs, private public companies. As QDs emerge viable choice...
Abstract Assuming that large color gamut and therefore better reproducibility will be a highly desired feature of all displays as we look to the near future, make case in this paper quantum dots (QDs) are currently down‐conversion technology choice allow liquid crystal display makers cost‐effectively reach exceed 100% NTSC (National Television Standard Committee) Adobe RGB standards while achieving maximum system efficiency. We discuss detail numerous fundamental advantages QDs over...
We report an ultra‐bright, highly efficient, low roll‐off, inverted quantum dot‐based red light emitting device (QLED) using solution‐processed zinc oxide nanoparticles and cesium carbonate films as the electron injection hole blocking layers, respectively. Record luminance of 165,000 Cd/m 2 has been obtained at a current density 1000 mA/cm with driving voltage 5.8 V for deep CIE coordinates (0.69, 0.31).
We have developed a <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$1.62\mu \mathrm{m}$</tex> pixel pitch global shutter sensor optimized for imaging in the near infrared (NIR) and shortwave (SWIR) regions of light spectrum. This breakthrough was made possible through use our colloidal Quantum Dot (QD) thin film technology, which we named Film (QF). scaled up this new platform technology to 300mm manufacturing toolset. The challenges associated...
We demonstrate surface emitting distributed feedback (DFB) lasers across the red, green, and blue from densely packed colloidal quantum dot (CQD) films.The solid CQD films were deposited on periodic grating patterns to enable 2nd-order DFB lasing action at mere 120, 280, 330 μJ/cm 2 of optical pumping energy densities for lasers, respectively.The operated in single mode operation with less than 1 nm full-width-half-maximum.We measured far-field showing high degree spatial beam...
Colloidal quantum dots (CQD) are now making their entry to full-color displays, endowed by brightness and single-material base. By contrast, many obstacles have been encountered in use towards lasers. We demonstrate here optically pumped distributed feedback (DFB) lasers, based on close-packed, solid films self-assembled from type-I CQDs. Notably, the single mode CQD-DFB lasers could reach such a low threshold as be pumpable with compact pulsed source quasi-continuous wave regime. Our...
We report on the fabrication of polymer waveguides containing infrared-emitting nanocrystal quantum dots. Both PbSe and InAs dots are incorporated into a fluorinated by surface functionalization method. The optical properties shown to be unaffected entire process. This method may provide versatile platform for integration planar photonic circuits.
The manganese oxo-cluster, [Mn12O12(O2CMe)16(H2O)4]·2(HO2CMe)·4(H2O), (Mn-12), has been the subject of intense interest for its novel magnetic properties. Although it is a model system nanoscale data storage, no methods forming films or attaching cluster to surfaces have reported. Here we demonstrate simple approach using functionalized self-assembled monolayers and short-chain polyelectrolytes make monolayer nanometer-scale multilayer Mn-12.
High-brightness, color-tunable colloidal quantum dots are incorporated in 3D nanoporous GaN to create a nanocomposite material (CQD/NP-GaN), which is demonstrated be an effective approach for wavelength down-conversion nanomaterial solid-state lighting. The white-light-emitting diode (LED) made from blue GaN-based LED and the CQD/NP-GaN shows increase of extraction efficiency by factor 2, controllable white color, as high 82%.
Ins Blaue: Die hier vorgestellten (CdS)ZnS-Nanokristalle für Displays zeichnen sich durch eine blaue Lumineszenz im engen Bereich zwischen 460 und 480 nm (Halbwertsbreite≤28 nm; siehe Bild) mit einer Quanteneffizienz von 20–30 % aus. Nach Integrierung in dünnen organischen Filmen kann Elektrolumineszenz dieser Kern-Schale-Nanokristalle ausgelöst werden.
Abstract Quantum dot light emitting diodes QLEDs are a printable thin film electroluminescent technology that can deliver exceptional color and efficiency at low cost of manufacture for display solid‐state lighting applications. However, while most literature reports focus on the performance individual test pixels, examples working prototypes have been sorely lacking. We report our progress developing near‐to‐eye direct view Both 4″ diagonal active‐matrix bottom‐emitting monochrome QLED an...
Abstract Quantum dots (QDs) are a luminescent semiconductor nanomaterial technology that delivers exceptional color for liquid crystal display backlighting unit (LCD‐BLU) applications. We report on the scale‐up of rapid‐injection, batch synthetic method, and compare it to other proposed manufacturing methods. A discussion how meet high volume QD production needs follows, consistent with current future LCD volumes, taking into account dominant implementation geometries.