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Principles Of Optics Electromagnetic Theory Of Propagation Interference And Diffraction Of Light

Organic materials that exhibit thermally activated delayed fluorescence (TADF) are an attractive class of functional materials that have witnessed a booming development in recent years. Since Adachi et al. reported high-performance TADF-OLED devices in 2012, there have been many reports regarding the design and synthesis of new TADF luminogens, which have various molecular structures and are used for different applications. In this review, we summarize and discuss the latest progress concerning this rapidly developing research field, in which the majority of the reported TADF systems are discussed, along with their derived structure–property relationships, TADF mechanisms and applications. We hope that such a review provides a clear outlook of these novel functional materials for a broad range of scientists within different disciplinary areas and attracts more researchers to devote themselves to this interesting research field.

Recent advances in organic thermally activated delayed fluorescence materials.

We thank the University of St Andrews for support. EZ-C thanks the Leverhulme Trust for financial support (RPG-2016-047). and the EPSRC (EP/P010482/1) for financial support.

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Purely Organic Thermally Activated Delayed Fluorescence Materials for Organic Light-Emitting Diodes.

In the last two decades, plasmon resonance in gold nanoparticles (Au NPs) has been the subject of intense research efforts. Plasmon physics is intriguing and its precise modelling proved to be challenging. In fact, plasmons are highly responsive to a multitude of factors, either intrinsic to the Au NPs or from the environment, and recently the need emerged for the correction of standard electromagnetic approaches with quantum effects. Applications related to plasmon absorption and scattering in Au NPs are impressively numerous, ranging from sensing to photothermal effects to cell imaging. Also, plasmon-enhanced phenomena are highly interesting for multiple purposes, including, for instance, Raman spectroscopy of nearby analytes, catalysis, or sunlight energy conversion. In addition, plasmon excitation is involved in a series of advanced physical processes such as non-linear optics, optical trapping, magneto-plasmonics, and optical activity. Here, we provide the general overview of the field and the background for appropriate modelling of the physical phenomena. Then, we report on the current state of the art and most recent applications of plasmon resonance in Au NPs.

Surface plasmon resonance in gold nanoparticles: a review.

The present review is devoted to summarizing the recent advances (2015-2017) in the field of metal-catalysed group-directed C-H functionalisation In order to clearly showcase the molecular diversity that can now be accessed by means of directed C-H functionalisation, the whole is organized following the directing groups installed on a substrate Its aim is to be a comprehensive reference work, where a specific directing group can be easily found, together with the transformations which have been carried out with it Hence, the primary format of this review is schemes accompanied with a concise explanatory text, in which the directing groups are ordered in sections according to their chemical structure The schemes feature typical substrates used, the products obtained as well as the required reaction conditions Importantly, each example is commented on with respect to the most important positive features and drawbacks, on aspects such as selectivity, substrate scope, reaction conditions, directing group removal, and greenness The targeted readership are both experts in the field of C-H functionalisation chemistry (to provide a comprehensive overview of the progress made in the last years) and, even more so, all organic chemists who want to introduce the C-H functionalisation way of thinking for a design of straightforward, efficient and step-economic synthetic routes towards molecules of interest to them Accordingly, this review should be of particular interest also for scientists from industrial R&D sector Hence, the overall goal of this review is to promote the application of C-H functionalisation reactions outside the research groups dedicated to method development and establishing it as a valuable reaction archetype in contemporary R&D, comparable to the role cross-coupling reactions play to date

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A comprehensive overview of directing groups applied in metal-catalysed C-H functionalisation chemistry.

During the Central European Iron Age, more specifically between 600 and 100 BC, red precious corals (Corallium rubrum) became very popular in many regions, often associated with the so-called (early) Celts. Red corals are ideally suited to investigate several key questions of Iron Age research, like trade patterns or social and economic structures. While it is fairly easy to distinguish modern C. rubrum from bone, ivory or shells, archaeologists are confronted with ancient, hence altered, artifacts. Due to ageing processes, archaeological corals lose their intensive red color and shiny surface and can easily be confused with these other light colored materials. We propose a non-destructive multi-stage approach to identify archaeological corals amongst other biominerals used as ornament during the central European Iron Age with emphasis on optical examination and mobile Raman spectroscopy. Our investigations suggest that the noticeably high amount of misidentifications or at least uncertain material declarations existing in museums or even in the literature (around 15%) could be overcome by the proposed approach. Furthermore, the range of different materials is higher than previously expected in archaeological research. This finding has implications for contemporary concepts of social structures and distribution networks during the Iron Age.

Raman Investigations to Identify Corallium rubrum in Iron Age Jewelry and Ornaments

Recently, a new external beam PIXE facility was installed at the 2 MV tandem ion accelerator of the Federal Institute for Materials Research and Testing (BAM). For external beam PIXE, 1–3 MeV protons are extracted through a thin exit window and focused on the target under air pressure. This set-up is particularly suitable for multielement trace analysis in the field of unique art and archaeological objects. We report the first archaeometric findings of the study of Mughal painting pigments by means of this experimental set-up. The Indian miniatures chosen for the study date from the Mughal period (1526–1858) and were executed by various artists in particular workshops between the 17th and the 19th centuries. The paintings are typical depictions of Mughal sovereigns and courtiers or show genre scenes. Until now, in contrast to European paintings, only scarce information on the materials used in the workshops of Mughal painters has been available. Therefore, the exact knowledge of the painting materials employed would allow a more detailed attribution of the precious miniatures to a particular period and to distinguish original paintings from later copies. Copyright © 2004 John Wiley & Sons, Ltd.

An external PIXE study: Mughal painting pigments

This paper represents a review of the importance of studying fluorine (F) in archaeological artefacts. Fluorine is an element which is omnipresent in water and soil environments. Thus, it is incorporated into archaeological artefacts as bones or flints in different ways during their burial depending on the geochemical conditions and on the artefact conservation state. The incorporation pathways of F lead to different F distribution patterns in the artefacts. Therefore, these artefacts can be considered as geochemical archives for the reconstruction of their burial history. Moreover, studies of F in ancient bone material or flints can give precious information that are relevant for archaeological purposes as e.g. post-mortem diagenesis. In some cases, relative dating or evidence for heat processes of artefacts is possible. In the introduction, the paper gives a review of general questions in archaeology and relevant examples where analytical studies can give answers to. Then, ancient materials where F is found are presented. The study of F in archaeology is particularly important for materials as bones and flints. Therefore, the majority of the paper is dedicated to the study of these materials and the information deduced on the past. The knowledge of the composition and structure of both types of material is necessary for the understanding of the F incorporation, and is briefly reviewed. Furthermore, postulated incorporation mechanisms of the F uptake over time are reported. In the next paragraph, the most commonly applied analytical methods for F detection in archaeological artefacts are presented. Specific problems related with the analysis of precious and unique artefacts are discussed. Significant archaeological case studies are shown and discussed to highlight the importance of F studies in archaeological artefacts. However, these examples enable us to evidence the limits of F relevance in archaeology and the precautions to take when using these data for archaeological interpretations. Finally, conclusions and an outlook are presented.

Chapter 8 Fluorine and Its Relevance for Archaeological Studies

Ion beam analysis plays an important role in cultural heritage (CH) studies as it offers a combination of simultaneous and complementary analytical techniques (PIXE/PIGE/RBS) and spatially resolved mapping functions. Despite being considered non-destructive, the potential risk of beam-induced modifications during analysis is increasingly discussed. This work focuses on the impact of proton beams on parchment, present in our CH in form of unique historical manuscripts. Parchment is one of the organic, protein-based CH materials believed to be the most susceptible to radiation-induced changes. Various modification patterns, observed on parchment cross-sections by optical and electron microscopy are reported: discoloration (yellowing), formation of cavities and denaturation of collagen fibers. Considerable modifications were detected up to 100 µm deep into the sample for beam fluences of 4 µC/cm2 and higher. The presence of ultramarine paint on the parchment surface appears to increase the harmful effects of proton radiation. Based on our results, a maximum radiation dose of 0.5 µC/cm2 can be considered as 'safe boundary' for 2.3 MeV PIXE analysis of parchment under the applied conditions. 

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Author Correction: Proton beam irradiation induces invisible modifications under the surface of painted parchment

tural heritage objects. Scientific analysis, especially the chemical composition, of artistic and cultural heritage objects reveals information, which cannot be gained from art historical investigations alone. The improvement of X-ray analytical method, like X-ray fluorescence (XRF) analysis and Particle-Induced X-ray Emission (PIXE) analysis, makes it possible to investigate even fragile and very precious objects non-destructively. In principle, two strategies are generally embarked: First, very sophisticated set-ups using particle accelerators or synchrotron-radiation sources for very sensitive or highly spatially-resolved and depth-sensitive analysis. Second, portable instrumentation for in-situ measurements at archaeological excavations, museums and collections. Highlights of investigated objects are limoges school enamels, manuscripts of Goethe and Schiller, the sceptre of Charlemagne, medieval metal objects, silverpoint drawings from the Renaissance, and Indian Mughal paintings.

Ina Reiche

Papers

Raman Investigations to Identify Corallium rubrum in Iron Age Jewelry and Ornaments

An external PIXE study: Mughal painting pigments

Chapter 8 Fluorine and Its Relevance for Archaeological Studies

Author Correction: Proton beam irradiation induces invisible modifications under the surface of painted parchment

Chemie der Kunst: Zerstörungsfreie Analyse von Kunst- und Kulturgütern