Atomic Structure of Luminescent Centers in High-Efficiency Ce-doped w-AlN Single Crystal

Ishikawa, Ryo; Lupini, Andrew R.; Oba, Fumiyasu; Findlay, Scott; Shibata, Naoya; Taniguchi, Takashi; Watanabe, Kenji; Hayashi, Hiroyuki; Sakai, Toshifumi; Tanaka, Isao; Ikuhara, Yuichi; Pennycook, Stephen J.

doi:10.1038/srep03778

Cited by 46 publications

(31 citation statements)

References 32 publications

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“…Figure 1c,d show views along a <110> p direction. These images are the result of summing ten sequentially acquired frames after alignment by cross-correlation12, with no other image processing being applied. These images are from thin, single domain regions of the specimens (Supplementary Figure S1 containing lower magnification images show that the crushed powder SYCO specimens contain at least three, orthogonal domains).…”

Section: Resultsmentioning

confidence: 99%

Magnetic Ordering in Sr3YCo4O10+x

Kishida

Kapetanakis

Yan

et al. 2016

Sci Rep

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Transition-metal oxides often exhibit complex magnetic behavior due to the strong interplay between atomic-structure, electronic and magnetic degrees of freedom. Cobaltates, especially, exhibit complex behavior because of cobalt’s ability to adopt various valence and spin state configurations. The case of the oxygen-deficient perovskite Sr3YCo4O10+x (SYCO) has attracted considerable attention because of persisting uncertainties about its structure and the origin of the observed room temperature ferromagnetism. Here we report a combined investigation of SYCO using aberration-corrected scanning transmission electron microscopy and density functional theory calculations. Guided by theoretical results on Co-O distances projected on different planes, the atomic-scale images of several different orientations, especially of the fully oxygenated planes, allow the unambiguous extraction of the underlying structure. The calculated magnetic properties of the new structure are in excellent agreement with the experimental data.

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Section: Resultsmentioning

confidence: 99%

Magnetic Ordering in Sr3YCo4O10+x

Kishida

Kapetanakis

Yan

et al. 2016

Sci Rep

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“…The characteristic energy range of AlN luminescence is in the UV-blue portions of the spectrum 16 . Study [10] contains a description of Ce-doped AlN single crystal preparation and examination of the luminescence, which, according to the authors, exhibits pink color centers. Blue-violet self-activated luminescence was mentioned 17 .Photonic crystals were fabricated by the authors of [18], which showed luminescence in the deep UV region.…”

Section: Radiative Process In Silicon Carbide and Aluminum Nitridementioning

confidence: 99%

Characterizing SiC-AlN semiconductor solid solutions with indirect and direct bandgaps

Dallaeva

Ramazanov

et al. 2015

Photonics, Devices, and Systems VI

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The objective of the study is to characterize the dependence of the optical properties of solid solutions of silicon carbide and aluminum nitride on composition. Even small differences in composition provide manipulation of band gap features over a wide range. Data for this paper were collected by X-ray diffraction, photoluminescence and absorption spectroscopy. The evolution of the observed optical properties as a result of compositional changes were studied. X-ray studies confirm the presence of a(SiC) 1-x (AlN) x solid solution. Investigation of absorption spectra shows the optical band gap of the sample with composition (SiC) 0,88 (AlN) 0,12 is 3.5eV, and 4.24 eV for the (SiC) 0,36 (AlN) 0,64 solid solution. The photoluminescence spectra demonstrate the strong dependence of the spectra on composition x. The experimental results are in agreement with theory. These data demonstrate the optimization of optical properties for particular optoelectronic applications by varying the (SiC) 1-х (AlN) х composition.

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“…To investigate the depth sensitivity of LAI-STEM, we have chosen to study a Ce-doped w-AlN system [47] and the defect structure model that was used is shown in Fig. 5(a).…”

Section: Three-dimensional Point Defect Imagingmentioning

confidence: 99%

Large-angle illumination STEM: Toward three-dimensional atom-by-atom imaging

et al. 2015

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To fully understand and control materials and their properties, it is of critical importance to determine their atomic structures in all three dimensions. Recent revolutionary advances in electron optics - the inventions of geometric and chromatic aberration correctors as well as electron source monochromators - have provided fertile ground for performing optical depth sectioning at atomic-scale dimensions. In this study we theoretically demonstrate the imaging of top/sub-surface atomic structures and identify the depth of single dopants, single vacancies and the other point defects within materials by large-angle illumination scanning transmission electron microscopy (LAI-STEM). The proposed method also allows us to measure specimen properties such as thickness or three-dimensional surface morphology using observations from a single crystallographic orientation.

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Atomic Structure of Luminescent Centers in High-Efficiency Ce-doped w-AlN Single Crystal

Cited by 46 publications

References 32 publications

Magnetic Ordering in Sr3YCo4O10+x

Magnetic Ordering in Sr3YCo4O10+x

Characterizing SiC-AlN semiconductor solid solutions with indirect and direct bandgaps

Large-angle illumination STEM: Toward three-dimensional atom-by-atom imaging

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