Resources

Showing 11-20 of 52
Oldest
Latest

  • Structural and optical properties of disc-in-wire InGaN/GaN LEDs

    Publication
    Nano Letters
    Yan, L.; Jahangir, S.; Wight, S. A.; Nikoobakht, B.; Bhattacharya, P.; Millunchick, J. M.

    This study examines the role of the microstructure and optical properties of InGaN/GaN nanowire LED structures on Si(111) having different nanowire coverages. Cathodoluminescence (CL) measurements show that all samples exhibit broad emission around the intended energy, 1.95 eV (635 nm).

  • Amorphous sub-nanometre Tb-doped SiOxNy/SiO2 superlattices for optoelectronics

    Publication
    Nanotechnology
    Ramírez, J. M.; Wojcik, J.; Berencén, Y.; Ruiz-Caridad, A.; Estradé, S.; Peiró, F.; Mascher, P.; Garrido, B.

    Amorphous sub-nanometre Tb-doped SiOxNy/SiO2 superlattices were fabricated by means of alternating deposition of 0.7 nm thick Tb-doped SiOxNy layers and of 0.9 nm thick SiO2 barrier layers in an electron-cyclotron-resonance plasma enhanced chemical vapour deposition system with in situ Tb-doping

  • Novel divalent europium doped MgAlON transparent ceramic for shortwave ultraviolet erasable windows

    Publication
    Scripta Materialia
    Liu, X.; Wang, H.; Tu, B.; Wang, W.; Fu, Z.

    A novel divalent europium ion doped UV erasable MgAlON (Mg0.27Al2.58O3.73N0.27) transparent ceramic in which Eu/Al atom ratio is 0.25% was fabricated by pressureless sintering. The ceramic was highly dense with high transmittance in visible and infrared region and good mechanical properties.

  • Dual-enhancement of photoluminescence and cathodoluminescence in Eu 3+-activated SrMoO 4 phosphors by Na+ doping

    Publication
    RSC Advances
    Du, P.; Yu, J. S.

    Eu3+-activated and Eu3+/Na+-coactivated SrMoO4 phosphors were prepared by a conventional high-temperature solid-state reaction method.

  • GaN nanowires with pentagon shape cross-section by ammonia-source molecular beam epitaxy

    Publication
    Journal of Crystal Growth
    Lin, Y.; Leung, B.; Li, Q.; Figiel, J. J.; Wang, G. T.

    Ammonia-based molecular beam epitaxy (NH3-MBE) was used to grow catalyst-assisted GaN nanowires on (1EQ \O(1,¯)02) r-plane sapphire substrates.

  • Transmission electron microscope study of symmetry-related transitions in cubic Y2O3:Tb3+

    Publication
    Society for Information Display (SID)
    den Engelsen, D.; Fern, G. R.; Ireland, T. G.; Harris, P. G.; Silver, J.

    In this paper, we describe measurements of the cathodoluminescence of nanosized cubic Y2O3:Tb3+ with a transmission electron microscope. From the CL-spectra we determined the energy flow from excited Tb3+ in a S6 lattice site to Tb3+ in a C2 site.

  • Nanocathodoluminescence reveals mitigation of the stark shift in InGaN quantum wells by Si doping

    Publication
    Nano Letters
    Griffiths, J. T.; Zhang, S.; Rouet-Leduc, B.; Fu, W. Y.; Bao, A.; Zhu, D.; Wallis, D. J.; Howkins, A.; Boyd, I.; Stowe, D.; Kappers, M. J.; Humphreys; C.J.; Oliver, R. A.

    Nanocathodoluminescence reveals the spectral properties of individual InGaN quantum wells in high efficiency light emitting diodes. We observe a variation in the emission wavelength of each quantum well, in correlation with the Si dopant concentration in the quantum barriers.

  • Resonances of nanoparticles with poor plasmonic metal tips

    Publication
    Scientific Reports
    Ringe, E.; DeSantis, C. J.; Collins, S. M.; Duchamp, M.; Dunin-Borkowski, R. E.; Skrabalak, S. E.; Midgley, P. A.

    The catalytic and optical properties of metal nanoparticles can be combined to create platforms for light-driven chemical energy storage and enhanced in-situ reaction monitoring. However, the heavily damped plasmon resonances of many catalytically active metals (e.g.

  • Fractographic approach to metallurgical coke failure analysis. Part 1: Cokes of single coal origin

    Publication
    Fuel
    Roest, R.; Lomas, H.; Hockings, K.; Mahoney, M. R.

    Metallurgical coke is a complex brittle heterogeneous material consisting of carbon derived from fusible, semi-fusible and inert coal particles that forms a porous composite matrix.

  • Structural and luminescence effects of Ga co-doping on Ce-doped yttrium aluminate based phosphors

    Publication
    Journal of Alloys and Compounds
    Ayvacikli, A.; Canimoglu, A.; Muresan, L. E.; Tudoran, L. B.; Guinea, J. G.; Karabulut, Y.; Jorge, A.; Karali, T.; Can, N.

    Herein, we primarily focus on luminescence spectrum measurements of various types of green emitting yttrium aluminate phosphors modified with gallium (Y3Al5-xGaxO12) synthesised by solid state reaction.