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Emil Indrea

Bio: Emil Indrea is an academic researcher. The author has contributed to research in topics: Phosphor & Thin film. The author has an hindex of 22, co-authored 86 publications receiving 1363 citations.
Topics: Phosphor, Thin film, Yttrium, Europium, Hydrogen


Papers
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Journal ArticleDOI
TL;DR: In this paper, a spray pyrolyzed CuS thin film with aqueous solution containing CuCl2 · 2H2O, thiourea and cationic surfactant is presented.

172 citations

Journal ArticleDOI
TL;DR: In this article, the structural, optical and photoelectrical properties of thin PbS films were studied and the main characteristic of films as thick as 0.12-0.54 μ m is the photosensitivity, which is influenced by many factors such as film thickness, grain and crystallite size, faults probability, number of layers, thermal treatment and presence of impurities.

120 citations

Journal ArticleDOI
TL;DR: The results of the experiments suggest that the selectivity of zeolite is strongly influenced by the pH of the contact solution, dehydration energy of cations, diffusion coefficient and the pH at which the precipitation of hydroxides occurs.

107 citations

Journal ArticleDOI
TL;DR: In this paper, several complementary investigation techniques like SEM, Raman and XRD were used to follow the influence of the reactants molar ratio and thermal treatment on the TiO2 aerogel structures.

58 citations

Journal ArticleDOI
TL;DR: In this paper, the synthesis of Gd 2 O 2 S:Tb phosphor by solid-state reaction route from oxide precursors was presented. But the results were limited to the use of X-ray intensifying screens for medical diagnosis.

58 citations


Cited by
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Journal ArticleDOI
01 Jan 1977-Nature
TL;DR: Bergh and P.J.Dean as discussed by the authors proposed a light-emitting diode (LEDD) for light-aware Diodes, which was shown to have promising performance.
Abstract: Light-Emitting Diodes. (Monographs in Electrical and Electronic Engineering.) By A. A. Bergh and P. J. Dean. Pp. viii+591. (Clarendon: Oxford; Oxford University: London, 1976.) £22.

1,560 citations

Journal ArticleDOI
TL;DR: In this article, the chemistry of different solvent extractants and typical configurations for rare earth separations are reviewed. But the choice of extractants is influenced by both cost considerations and requirements of technical performance.

947 citations

Journal ArticleDOI
TL;DR: It is found consistently that under ambient conditions the copper deficient Cu(1.97)S (djurleite) is more stable than Cu(2) S (chalcocite) and this may be the reason behind the traditionally known instability of the bulk Cu( 2)S/CdS interface.
Abstract: Cu2−xS (x = 1, 0.2, 0.03) nanocrystals were synthesized with three different chemical methods: sonoelectrochemical, hydrothermal, and solventless thermolysis methods in order to compare their common optical and structural properties. The compositions of the Cu2−xS nanocrystals were varied from CuS (covellite) to Cu1.97S (djurleite) through adjusting the reduction potential in the sonoelectrochemical method, adjusting the pH value in the hydrothermal method and by choosing different precursor pretreatments in the solventless thermolysis approach, respectively. The crystallinity and morphology of the products were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM), which shows that most of them might be of pure stoichiometries but some of them are mixtures. The obtained XRDs were studied in comparison to the XRD patterns of previously reported Cu2−xS. We found consistently that under ambient conditions the copper deficient Cu1.97S (djurleite) is more stable than Cu2S (chalco...

870 citations

Journal ArticleDOI
TL;DR: In this article, a review of recent research in the field of phosphor and scintillator materials and related detectors is presented, where the fundamental issues regarding the interaction of x-ray radiation with a solid state are explained.
Abstract: Recent research in the field of phosphor and scintillator materials and related detectors is reviewed. After a historical introduction the fundamental issues are explained regarding the interaction of x-ray radiation with a solid state. Crucial parameters and characteristics important for the performance of these materials in applications, including the employed measurement methods, are described. Extended description of the materials currently in use or under intense study is given. Scintillation detector configurations are further briefly overviewed and selected applications are mentioned in more detail to provide an illustration.

741 citations

Journal ArticleDOI
TL;DR: A variety of strategies such as structural tuning, composition control, doping, hybrid structures, heterostructures, defect control, temperature effects and porosity effects on metal sulfide nanocrystals are discussed and how they are exploited to enhance performance and develop future energy materials.
Abstract: In recent years, nanocrystals of metal sulfide materials have attracted scientific research interest for renewable energy applications due to the abundant choice of materials with easily tunable electronic, optical, physical and chemical properties. Metal sulfides are semiconducting compounds where sulfur is an anion associated with a metal cation; and the metal ions may be in mono-, bi- or multi-form. The diverse range of available metal sulfide materials offers a unique platform to construct a large number of potential materials that demonstrate exotic chemical, physical and electronic phenomena and novel functional properties and applications. To fully exploit the potential of these fascinating materials, scalable methods for the preparation of low-cost metal sulfides, heterostructures, and hybrids of high quality must be developed. This comprehensive review indicates approaches for the controlled fabrication of metal sulfides and subsequently delivers an overview of recent progress in tuning the chemical, physical, optical and nano- and micro-structural properties of metal sulfide nanocrystals using a range of material fabrication methods. For hydrogen energy production, three major approaches are discussed in detail: electrocatalytic hydrogen generation, powder photocatalytic hydrogen generation and photoelectrochemical water splitting. A variety of strategies such as structural tuning, composition control, doping, hybrid structures, heterostructures, defect control, temperature effects and porosity effects on metal sulfide nanocrystals are discussed and how they are exploited to enhance performance and develop future energy materials. From this literature survey, energy conversion currently relies on a limited range of metal sulfides and their composites, and several metal sulfides are immature in terms of their dissolution, photocorrosion and long-term durability in electrolytes during water splitting. Future research directions for innovative metal sulfides should be closely allied to energy and environmental issues, along with their advanced characterization, and developing new classes of metal sulfide materials with well-defined fabrication methods.

685 citations