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Effect of oxygen content on the structural and optical properties of ZnO films grown by atmospheric pressure MOCVD

Progress in Natural Science:Materials International 2013年第1期23卷 44-50页

作者： Sajjad Hussain Yaqoob Khan Volodymyr Khranovskyy Riaz Muhammad rositza yakimova Department of Applied Physics Federal Urdu University of ArtsScience and TechnologyIslamabadPakistan Nanosciences and Catalysis Division National Centre for PhysicsQuaid-e-Azam University Campus45320 IslamabadPakistan Department of Physics Chemistryand Biology(IFM)Linkǒping UniversityLinkǒping SE-581 83Sweden

Atmospheric pressure MOCVD was used to deposit ZnO layers on sapphire and homoepitaxial template under different oxygen flow *** content affects the lattice constant value and texture coefficient of the films as evidenced by the θ-2θ peaks position and their *** deposited at lower oxygen flow rate possess higher value of strain and *** films deposited at high oxygen flow rates show intense UV emissions while samples prepared under oxygen deficient conditions exhibited defect related emission along with UV *** results are compared to the ZnO films deposited homoepitaxially on annealed ZnO *** data obtained suggest that ZnO stoichiometry is responsible for the structural and optical quality of ZnO films.

关键词： APMOCVD XRD PL Near-band-edge(NBE)

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Fluorescent SiC and its application to white light-emitting diodes

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Journal of Semiconductors 2011年第1期32卷 24-26页

作者： Satoshi Kamiyama Motoaki Iwaya Tetsuya Takeuchi Isamu Akasaki Mikael Syvjrvi rositza yakimova Department of Materials Science and Engineering Meijo University Department of Physics Chemistry and Biology Linkping University

Fluorescent-SiC （f-SiC）, which contains donor and acceptor impurities with optimum concentrations, has high conversion efficiency from NUV to visible light caused by donor-acceptor-pair （DAP） recombination. This material can be used as a substrate for a near UVlight-emitting diode （LED） stack, and leads to monolithic white LED device with suitable spectral property for general lighting applications. In this paper, we describe basic technologies of the white LED, such as optical properties of f-SiC substrate, and epitaxial growth of NUV stack on the f-SiC substrate.

关键词： white LED phosphor SiC donor-acceptor-pair GaN general lighting

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Angiogenesis in Rat Uterine Scar after Introduction af Autological Mesenchymal Stem Cells of Bone Marrow Origin

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Journal of Biomedical Science and Engineering 2011年第3期4卷 164-172页

作者： Igor Maiborodin Natalia yakimova Vera Matveeva Andrey Shevela Elena Maiborodina Ekaterina Pekareva Olesya Tkachuk 不详

The results of injecting of autologic mesenchymal stem cells of bone marrow origin (AMSCBMO), transfected by the GFP gene, into the scar of rat uterine horns were studied by methods of light microscopy. After the introduction of AMSCBMO into the formed scar on the right (2 months after the ligation) large groups of blood vessels with cellular elements inside were present;groups like that were not found in the opposite side. Studying unstained sections under reflected ultraviolet light the sufficient bright luminescence in the endothelium and the external membrane of scar vessels was found in uterine horn only on the side of introduction of AMSCBMO. It was concluded that after the introduction of AMSCBMO into the scar tissue they form blood vessels by differentiation into endotheliocytes and pericytes. GFP gene expression not only in endothelium of vessels, but also in their external membrane indicates that differentiation of AMSCMBO is possible in endothelial and in pericytal directions.

关键词： uterine scar mesenchymal stem cells angiogenesis endotheliocytes pericytes

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