Sökning: "efficiencies of emission"

Visar resultat 6 - 10 av 44 avhandlingar innehållade orden efficiencies of emission.

  1. 6. Diffuse Optical Spectroscopy and Imaging of Turbid Media

    Författare :Can Xu; Atomfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; upconverting nanoparticles; luminescence; fluorescence; inverse problem; diffuse reflection spectroscopy; biomedical optics; photon migration; biomedical imaging; gas spectroscopy; medical diagnostics; tomography; Fysicumarkivet A:2013:Xu;

    Sammanfattning : This thesis deals with optical spectroscopy and imaging of complex and strongly scattering turbid media. Focus is mainly placed on three topics, being i) diffuse optical spectroscopy of choroidal tumors, ii) gas spectroscopy in scattering materials using the GASMAS (gas in scattering media absorption spectroscopy) technique, and iii) luminescence diffuse optical imaging and tomography of tissues. LÄS MER

  3. 7. Mitigating climate change - The role of developing countries

    Författare :Tobias A Persson; Chalmers tekniska högskola; []
    Nyckelord :;

    Sammanfattning : The objective of the UN Framework Convention on Climate Change is to stabilize greenhouse gases in the atmosphere at a level that prevents dangerous anthropogenic interference with the climate system. It is still politically and scientifically uncertain at which level greenhouse gases must be stabilized to achieve this objective. LÄS MER

  4. 8. Energy Transfer Processes and Quenching Pathways in Lanthanide Complexes: The Role of Structural Changes

    Författare :Daniel Kocsi; K. Eszter Borbas; Raphaël Tripier; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; lanthanide; luminescence; sensitisation; quenching; electron transfer; organic chromophores; fluorination; Chemistry with specialization in Inorganic Chemistry; Kemi med inriktning mot oorganisk kemi; Chemistry with specialization in Organic Chemistry; Kemi med inriktning mot organisk kemi;

    Sammanfattning : Due to their unique magnetic and luminescent properties, trivalent lanthanides (Ln(III)) have been widely utilised in cellular imaging. Ln(III) luminescence is usually sensitized by a light-harvesting ‘antenna’, a chromophore that can transfer the excitation energy to the Ln(III). LÄS MER

  5. 9. Studies of Voltage Losses in Organic Solar Cells

    Författare :Deping Qian; Fengling Zhang; Feng Gao; Olle Inganäs; Natalie Stingelin; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Organic photovoltaic (OPV) devices based on semiconducting polymers and small molecules are potential alternatives to inorganic solar cells, owing to their advantages of being inexpensive, lightweight, flexible and suitable for roll-to-roll production. The state of art organic solar cells (OSCs) performed power conversion efficiencies (PCEs) over 13%. LÄS MER

  7. 10. Computational Predictions of Conjugated Polymer Properties for Photovoltaic Applications

    Författare :Svante Hedström; Beräkningskemi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Conjugated polymers; density functional theory; organic photovoltaics; light-harvesting capabilities; quantum chemistry; absorption spectra; electronic structure; computational predictions;

    Sammanfattning : Organic solar cells employing fullerenes blended with conjugated polymers as the main light-absorbing material have achieved power conversion efficiencies exceeding 10%. They hold promise as an alternative energy source with many advantages in terms of long-term sustainability and reduced greenhouse gas emissions. LÄS MER