Preparation of CaS:Cu,F thin-film electroluminescent devices with an emission including purple region

Hakamata, Shintaro; Ehara, Mami; Kominami, Hiroko; Nakanishi, Y.; Hatanaka, Y.

doi:10.1016/j.apsusc.2004.10.104

Cited by 24 publications

(3 citation statements)

References 2 publications

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“…Many researchers have extensively studied these compounds because they exhibit a half-metallic feature [8,9] and owing to their ferromagnetic stability at temperatures above room temperature [10,11]. The calcium chalcogenides CaX (X = S, Se, Te) belong to the II-VI type alkaline earth chalcogenides, which are important compounds because of their extensive applications ranging from catalysis to microelectronics as well as in the field of electro-and photo-luminescent devices [12][13][14][15][16][17][18][19][20][21][22]. The CaO calcium oxide wide-bandgap semiconductor is one of the families of calcium chalcogenides, which crystallised in the NaCl-type structure (B1) and undergoes a firstorder phase transition from NaCl (B1) phase to the CsCl (B2) structure under high pressure [16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Ferromagnetism, half-metallicity and spin-polarised electronic structures characterisation insights in Ca_1−xTi_xO

Korichi

Doumi

Mokaddem

et al. 2020

Philosophical Magazine

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Section: Introductionmentioning

confidence: 99%

Ferromagnetism, half-metallicity and spin-polarised electronic structures characterisation insights in Ca_1−xTi_xO

Korichi

Doumi

Mokaddem

et al. 2020

Philosophical Magazine

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“…225) and large unit cell of 5.68 Å . Owing to the wide band-gap ($ 5.38 eV), CaS is technologically important as a host material in luminescence technology (Rao, 1986;Versluys et al, 2001;Hakamata et al, 2005;Barrett et al, 2005). Meanwhile, it also exhibits unique structural behavior under high pressure.…”

Section: Introductionmentioning

confidence: 99%

Electronic structure and hybridization of CaS by means of X-ray absorption spectroscopy at Ca and S K-edges

Liu

Cui

et al. 2012

J Synchrotron Radiat

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The cubic calcium sulfide (CaS) is a well known system and an attractive building block material for many luminescence technological applications. However, it is essential to achieve an accurate understanding of its electronic structure in order to engineer its band structure for optimized applications. Here a study of the electronic structure of CaS by means of X-ray absorption spectroscopy performed at both Ca and S K-edges, and calculations performed in the framework of the multiple-scattering theory and of the finite difference method are presented. At the Ca K-edge the presence of an anomalous d states feature is discussed while in the S K-edge spectrum the presence of a pre-edge shoulder owing to the hybridization among Ca d states and S p states is pointed out. Although the l-projected density of states of CaS is in good agreement with previous first-principles calculations, the standard muffin-tin potential is inadequate to reproduce near-edge structures at both Ca and S K-edges in this system. Indeed, with its highly symmetric and less compact structure, CaS is characterized by a large set of collinear atomic configurations that pose severe constraints on the construction of the atomic potential. On the contrary, the finite-difference method with no muffin-tin approximation is more suitable for X-ray absorption calculations in this system.

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“…Alkaline earth chalcogenides are important materials with a wide technological application ranging from catalysis to microelectronics as well as in the area of electro-and photoluminescent devices (Hakamata et al, 2005;Speziale et al, 2006;Murtaza et al, 2014). Among these compounds, the CaX (X = O, S, Se) has a closed-shell ionic environment, crystallizing in the rock-salt NaCl-type (B1) structure at ambient conditions (Doll et al, 1996;Mishra et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Recent Insights Into Electronic Performance, Magnetism and Exchange Splittings in the Cr-substituted CaO

Doumi¹,

Mokaddem²,

Tadjer³

et al. 2020

Front. Chem.

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The first-principles computations of density functional theory are employed to characterize the structural properties, electronic structures, and ferromagnetism induced by Cr impurities in Ca 1-x Cr x O compounds at concentrations x = 0. 25, 0.5, and 0.75. The dynamic stability is performed by the phonon spectra calculations. The structural parameters are computed by using Wu-Cohen generalized gradient approximation, while the electronic and magnetic properties are determined by the accurate Tran-Blaha-modified Becke-Johnson exchange potential. The crystal field, direct and indirect exchange splittings were investigated to determine the origin and stability of ferromagnetic state configuration. The Ca 1-x Cr x O systems have right half-metallicities, which are verified by the spin polarization of 100% and the integer values of total magnetic moments. The Ca 0.75 Cr 0.25 O, Ca 0.5 Cr 0.5 O, and Ca 0.25 Cr 0.75 O are half-metallic ferromagnetic with flip-gaps of 1.495, 0.888, and 0.218 eV, respectively. Therefore, the Ca 1-x Cr x O materials are suitable candidates for possible applications of spin-injection in future semiconductors spintronics.

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Preparation of CaS:Cu,F thin-film electroluminescent devices with an emission including purple region

Cited by 24 publications

References 2 publications

Ferromagnetism, half-metallicity and spin-polarised electronic structures characterisation insights in Ca_1−xTi_xO

Ferromagnetism, half-metallicity and spin-polarised electronic structures characterisation insights in Ca_1−xTi_xO

Electronic structure and hybridization of CaS by means of X-ray absorption spectroscopy at Ca and S K-edges

Recent Insights Into Electronic Performance, Magnetism and Exchange Splittings in the Cr-substituted CaO

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Preparation of CaS:Cu,F thin-film electroluminescent devices with an emission including purple region

Cited by 24 publications

References 2 publications

Ferromagnetism, half-metallicity and spin-polarised electronic structures characterisation insights in Ca1−xTixO

Ferromagnetism, half-metallicity and spin-polarised electronic structures characterisation insights in Ca1−xTixO

Electronic structure and hybridization of CaS by means of X-ray absorption spectroscopy at Ca and S K-edges

Recent Insights Into Electronic Performance, Magnetism and Exchange Splittings in the Cr-substituted CaO

Contact Info

Product

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About

Ferromagnetism, half-metallicity and spin-polarised electronic structures characterisation insights in Ca_1−xTi_xO

Ferromagnetism, half-metallicity and spin-polarised electronic structures characterisation insights in Ca_1−xTi_xO