Sökning: "LEDs"

Visar resultat 1 - 5 av 110 avhandlingar innehållade ordet LEDs.

  1. 1. Luminescence Properties of ZnO Nanostructures and Their Implementation as White Light Emitting Diodes (LEDs)

    Författare :Naveed ul Hassan Alvi; Magnus Willander; Omer Nour; Vladimir V. Mitin; Linköpings universitet; []
    Nyckelord :Nanotechnology; Zinc oxide; nanostructures; luminescence; LEDs; color rendering; NATURAL SCIENCES; NATURVETENSKAP;

    Sammanfattning : In this thesis, luminescence properties of ZnO nanostructures (nanorods, nanotubes, nanowalls and nanoflowers) are investigated by different approaches for possible future application of these nanostructures as white light emitting diodes. ZnO nanostructures were grown by different growth techniques on different p-type substrates. LÄS MER

  3. 2. Thin-film ultraviolet light-emitting diodes realized by electrochemical etching of AlGaN

    Författare :Michael Alexander Bergmann; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; thin-film flip-chip; light-emitting diodes; UVB; AlGaN; thermocompression bonding; substrate removal; ultraviolet light; electrochemical etching; heterogeneous integration; LEDs;

    Sammanfattning : Ultraviolet (UV) light sources have a direct impact on everyone’s life. They are used to sterilize surfaces as well as for water purification. In addition, they are used in green houses to enhance health-promoting substances in plants, for phototherapy to treat skin diseases, for sensing and material curing. LÄS MER

  4. 3. Heterojunctions between zinc oxide nanostructures and organic semiconductor

    Författare :Amal Hansson (f.d. Wadeasa); Xavier Crispin; Dominique Vuillaume; Linköpings universitet; []
    Nyckelord :ZnO nanostructures; Organic semiconductors; LEDs; NATURAL SCIENCES; NATURVETENSKAP;

    Sammanfattning : Lighting is a big business, lighting consumes considerable amount of the electricity. These facts motivate for the search of new illumination technologies that are efficient. Semiconductor light emitting diodes (LEDs) have huge potential to replace the traditional primary incandescent lighting sources. LÄS MER

  5. 4. Fabrication and Characterization of Zinc Oxide Nanostructures for Piezoelectric, Mechanical and Electrical Applications

    Författare :Muhammad Yousuf Soomro; Magnus Willander; Omer Nur; Christian Falconi; Linköpings universitet; []
    Nyckelord :Nanotechnology; Zinc oxide; nanowires nanorods nanotubes; piezoelectric effect; nanogenerator; flexible substrate; p-type polymers; elastic modulus; LEDs; electrical characteristics;

    Sammanfattning : Nanotechnology, the science of manipulating materials on an atomic or molecular scale is one of the fastest growing areas of research and technology. Nanotechnology has a vast range of applications in medicine, electronics, biomaterials and energy production. New developments in nanotechnology are growing all the time. LÄS MER

  7. 5. Localization effects in ternary nitride semiconductors

    Författare :Vytautas Liuolia; Saulius Marcinkevicius; Toshiharu Saiki; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; AlGaN; InGaN; AlInN; LEDs; near-field microscopy; carrier dynamics; alloy fluctuations; carrier localization; built-in electric field; nonpolar planes; polarized luminescence;

    Sammanfattning : InGaN based blue and near-ultraviolet light emitting diodes and laser diodes have been successfully commercialized for many applications such as general lighting, display backlighting and high density optical storage devices. Despite having a comparably high defect density, these devices are known for their efficient operation, which is attributed to localization in potential fluctuations preventing carriers from reaching the centers of nonradiative recombination. LÄS MER