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Paul H. Holloway

Bio: Paul H. Holloway is an academic researcher from University College Cork. The author has contributed to research in topics: Thin film & Auger electron spectroscopy. The author has an hindex of 53, co-authored 346 publications receiving 11988 citations. Previous affiliations of Paul H. Holloway include University of Florida & University of York.


Papers
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TL;DR: In this paper, a solution-processed light-emitting diodes based on a quantum-dot emissive layer between an organic hole-transport layer and an electron transport layer of ZnO nanoparticles was demonstrated.
Abstract: Researchers demonstrate solution-processed light-emitting diodes based on a quantum-dot emissive layer between an organic hole-transport layer and an electron-transport layer of ZnO nanoparticles. The device achieves a luminance of 68,000 cd m−2 and power efficiencies of up to 8.2 lm W−1.

970 citations

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TL;DR: In this paper, the decoupling of quantum effects on excitation and emission is described, along with the use of quantum dots as sensitizers in phosphors, and the multimodal applications of quantum dot, including in electroluminescence device, solar cell and biological imaging.
Abstract: Semiconducting quantum dots, whose particle sizes are in the nanometer range, have very unusual properties. The quantum dots have band gaps that depend in a complicated fashion upon a number of factors, described in the article. Processing-structure-properties-performance relationships are reviewed for compound semiconducting quantum dots. Various methods for synthesizing these quantum dots are discussed, as well as their resulting properties. Quantum states and confinement of their excitons may shift their optical absorption and emission energies. Such effects are important for tuning their luminescence stimulated by photons (photoluminescence) or electric field (electroluminescence). In this article, decoupling of quantum effects on excitation and emission are described, along with the use of quantum dots as sensitizers in phosphors. In addition, we reviewed the multimodal applications of quantum dots, including in electroluminescence device, solar cell and biological imaging.

964 citations

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TL;DR: In this paper, a red, green and blue quantum-dot LEDs are realized by customizing the nanostructure of the quantum dots. But their performance was not as good as those of traditional LEDs.
Abstract: Bright, efficient red, green and blue quantum-dot LEDs are realized by customizing the nanostructure of the quantum dots.

832 citations

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TL;DR: In this article, the authors reviewed the device structure, electrical and optical device physics, and the material properties of TFEL displays, focusing on the phosphor layer properties and the radiative recombination phenomenon that is responsible for luminescence.
Abstract: Thin film electroluminescent (TFEL) displays are complex optoelectronic devices with challenging material requirements. The multilayer device structure includes two electrodes (one metallic and one transparent), two insulators, and a semiconducting ‘phosphor’ layer. Each layer has unique electronic and optical properties that must be satisfied for device operation. In this article, we review the device structure, the electrical and optical device physics, and the material properties of TFEL displays. Particular attention is given to the phosphor layer properties and the radiative recombination phenomenon that is responsible for luminescence. The current status of the red, green, blue and white TFEL phosphors is also reviewed, and the current and future applications are discussed.

413 citations

Journal ArticleDOI
TL;DR: The initial stages of the interaction of oxygen gas with a clean Ni (100) surface have been studied by a combination of LEED, AES, work function change and ion bombardment sectioning techniques as mentioned in this paper.

399 citations


Cited by
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TL;DR: The progress in the research and development of CQDs is reviewed with an emphasis on their synthesis, functionalization and technical applications along with some discussion on challenges and perspectives in this exciting and promising field.
Abstract: Fluorescent carbon nanoparticles or carbon quantum dots (CQDs) are a new class of carbon nanomaterials that have emerged recently and have garnered much interest as potential competitors to conventional semiconductor quantum dots. In addition to their comparable optical properties, CQDs have the desired advantages of low toxicity, environmental friendliness low cost and simple synthetic routes. Moreover, surface passivation and functionalization of CQDs allow for the control of their physicochemical properties. Since their discovery, CQDs have found many applications in the fields of chemical sensing, biosensing, bioimaging, nanomedicine, photocatalysis and electrocatalysis. This article reviews the progress in the research and development of CQDs with an emphasis on their synthesis, functionalization and technical applications along with some discussion on challenges and perspectives in this exciting and promising field.

3,514 citations

Journal ArticleDOI
TL;DR: This critical review describes the latest developments in the sensitization of near-infrared luminescence, "soft" luminescent materials (liquid crystals, ionic liquids, ionogels), electroluminescentmaterials for organic light emitting diodes, with emphasis on white light generation, and applications in luminecent bio-sensing and bio-imaging based on time-resolved detection and multiphoton excitation.
Abstract: Recent startling interest for lanthanide luminescence is stimulated by the continuously expanding need for luminescent materials meeting the stringent requirements of telecommunication, lighting, electroluminescent devices, (bio-)analytical sensors and bio-imaging set-ups. This critical review describes the latest developments in (i) the sensitization of near-infrared luminescence, (ii) “soft” luminescent materials (liquid crystals, ionic liquids, ionogels), (iii) electroluminescent materials for organic light emitting diodes, with emphasis on white light generation, and (iv) applications in luminescent bio-sensing and bio-imaging based on time-resolved detection and multiphoton excitation (500 references).

2,895 citations

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2,877 citations

Journal ArticleDOI
TL;DR: While the book is a standard fixture in most chemical and physical laboratories, including those in medical centers, it is not as frequently seen in the laboratories of physician's offices (those either in solo or group practice), and I believe that the Handbook can be useful in those laboratories.
Abstract: There is a special reason for reviewing this book at this time: it is the 50th edition of a compendium that is known and used frequently in most chemical and physical laboratories in many parts of the world. Surely, a publication that has been published for 56 years, withstanding the vagaries of science in this century, must have had something to offer. There is another reason: while the book is a standard fixture in most chemical and physical laboratories, including those in medical centers, it is not as frequently seen in the laboratories of physician's offices (those either in solo or group practice). I believe that the Handbook can be useful in those laboratories. One of the reasons, among others, is that the various basic items of information it offers may be helpful in new tests, either physical or chemical, which are continuously being published. The basic information may relate

2,493 citations