A5101567994- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Organic Light-Emitting Diodes Research
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Carbon and Quantum Dots Applications
- Luminescence and Fluorescent Materials
- ZnO doping and properties
- Photonic Crystals and Applications
- Conducting polymers and applications
- Lanthanide and Transition Metal Complexes
- Semiconductor Quantum Structures and Devices
- Synthesis and Reactivity of Heterocycles
- Cyclopropane Reaction Mechanisms
- Magnetism in coordination complexes
- Organic Electronics and Photovoltaics
- Nanocluster Synthesis and Applications
- Photonic and Optical Devices
- Nanowire Synthesis and Applications
- Perovskite Materials and Applications
- Luminescence Properties of Advanced Materials
- Synthesis and Characterization of Pyrroles
- Catalytic C–H Functionalization Methods
- Titanium Alloys Microstructure and Properties
- Catalytic Cross-Coupling Reactions
Samsung (South Korea)
2009-2023
Gyeonggi Research Institute
2019
Government of the Republic of Korea
2019
Ajou University
2009
Korea Advanced Institute of Science and Technology
2005-2008
University West
2007
Western University
2006
Chungbuk National University
2006
Highly luminescent, multiply passivated green- and red-light-emitting quantum dots are used as color converters in InGaN blue LEDs to achieve external efficiencies of 72% 34%, respectively. White QD-LEDs prepared for a display backlight shown have an efficacy 41 lm W−1 reproducibility 100% compared the NTSC standard CIE 1931. Finally, 46 inch LCD TV panel (see image) using QD-LED is successfully demonstrated first time. Detailed facts importance specialist readers published "Supporting...
There is an urgent demand to improve the efficiency and color purity of environment-friendly quantum dots (QDs), which can be used in wide gamut (WCG) displays. In this study, we optimized reaction conditions for InP core synthesis ZnSe/ZnS multishell growth on core. As a result, remarkable improvements were achieved photoluminescence yield (PL QY, 95%) full width at half-maximum (fwhm, 36 nm), with perfectly matched wavelength (528 nm) green WCG Injection phosphorus precursor mild...
Quantum dots (QD) are regarded as ideal light emitters for current and next-generation displays. Hence, there is an urgent need to produce environmentally friendly QDs that show high efficiency better color purity. From this perspective, a strategy of tuning the wavelength spectral width discussed optimize brightness space agreement. The critical parameters affecting photophysical properties, such uniformity InP QD core, thickness shape ZnSe shell, electron/hole distribution, surface...
Highly luminescent and stable InP/ZnS core−shell nanocrystals were developed by stepwise addition of zinc acetate dodecanethiol to an InP core solution. Zinc plays important role in surface etching ZnS shell formation.
The colloidal quantum dots (QDs) have inherent multiple dangling bonds (DBs) on the surface atoms due to intrinsic weak bonding nature and steric hindrance of organic ligands. Such DBs can be trap sites for charge carriers, leading reduction luminescence efficiency, but their detailed characteristics are still unclear. In this study, we disclose electronic optical features InP QDs via density functional calculations combined with experimental evidence. For core, both In-DB P-DB create...
Theoretical calculations based on density functional theory were performed to provide better understanding of the size dependent electronic properties InP quantum dots (QDs). Using a hybrid approach, we suggest reliable analytical equation describe change energy band gap as function size. Synthesizing colloidal QDs with 2-4 nm diameter and measuring their optical was also carried out. It found that theoretical gaps showed linear dependence inverse gave almost identical experimental values.
Highly luminescent quantum dots with a reverse type-I core/shell/shell structure consisting of ZnSe/InP/ZnS are developed. Their emission color can be tuned from violet to red by controlling the InP shell thickness. The final layer ZnS improves yield.
We investigated the dependence of spectral diffusion and blinking behaviors indium phosphide (InP) based core/shell/shell quantum dots (QDs) on their mid-shell compositions. synthesized two types QDs having different structures by controlling shell thickness, total sizes, selenium to sulfur ratios. The with a discrete (DS-QDs) exhibited higher photoluminescence (PL) yield (QY) narrower PL linewidth than gradient (GS-QDs). By analyzing X-ray diffraction (XRD) patterns, Raman spectra, we found...
Abstract Two dinuclear Eu III complexes have been synthesized by employing β‐diketones and 2,2′‐bipyrimidine (bpm) as sensitizing ligands for the ion a bridging ligand, respectively, characterized various means including single‐crystal X‐ray crystallography. The use of dibenzoylmethane (dbm) trifluorothenoylacetone (tta) gave [Eu 2 6 (bpm)] ( 1 ) ). Both show strong intermolecular π–π interactions that may be responsible their high melting points. analysis absorption, excitation, emission...
Abstract The formal [3+2] dipolar cycloaddition (or annulation) of donor‐acceptor cyclopropanoate esters with pyridines and 5‐nitroquinoline is reported. Electron‐deficient pyridine dipolarophiles (R=CN, CO 2 Et, COMe) participate in the annulation whereas electron rich species do not. product 2,3‐dihydroindolizines undergo rapid autooxidation, X‐ray structures for two aromatic products are
The organic light-emitting diodes (OLEDs) employing complex [salen(tBu)4Al(OC6H4-p-C6H5)] (4) as a hole-blocking layer produced stable green EL emission of Ir(ppy)3 irrespective changing current density and showed higher brightness device efficiency than the BAlq-based device.
ADVERTISEMENT RETURN TO ISSUECommunicationNEXTA Novel Solution-Processible Heterodinuclear AlIII/IrIII Complex for Host−Dopant Assembly OLEDsJung Oh Huh†, Min Hyung Lee†, Hyosook Jang†, Kyu Young Hwang†, Jong Soon Lee‡, Se Hun Kim‡, and Youngkyu Do*†View Author Information School of Molecular Science BK-21 Center Design Synthesis, Department Chemistry, KAIST, Daejeon 305-701, Korea, R&D Center, Dongwoo FineChem Company, Ltd., 1177 Pyeongtaek-Si, Gyeonggi-Do 451-764, Korea* To whom...
The lasing behavior of solution‐based colloidal quantum dots within an open microcavity is reported. small size and wide tunability the cavity provide single mode over a wavelength range in excess 25 nm. By extracting threshold differential gain for fundamental this spectral range, spectroscopy dot solution demonstrated. This new approach could help optimization laser media provides way constructing miniature arrays on‐chip integration.
We prepared green and red light emitting InP/ZnSeS Quantum Dots (QDs) with remarkably high quantum efficiency (up to 90%) the narrow spectrum width (less than 40nm). These environmentally friendly QDs are very competitive for applications of color‐saturated display compared previously developed Cd containing QDs. Although III‐V compound semiconductor nanomaterials known be sensitive oxidizing atmosphere, synthetic process mass production was successfully established. To complement...
Theoretical and experimental studies on the changes of optical properties CdSe/CdS/ZnS (core/double-shell) quantum dots (QDs) during oxidation process were first performed. An effective medium approach using modified Khon–Sham equation presents a new method to predict effects determine oxidized ratio nanoscale materials by quantitative comparison with photoluminescence (PL) changes. As progressed from nanocrystal surface, PL peak shifted longer wavelength efficiency (QE) continuously...
Quantum dots (QD) are regarded as ideal light emitters for current and next-generation displays. Hence, there is an urgent need to produce environmentally friendly QDs that show high efficiency and...
InP‐based quantum dot (QD) has been emerged as an environment‐friendly emitter for wide color gamut (WCG) display. In this work, we optimized the composition and structure of multishell on InP core. As a result, photoluminescence yield (PL QY, 95%) full width at halfmaximum (FWHM, 36 nm), with perfectly matched wavelength (528 nm) green in WCG displays.