Sökning: "upconversion"

Visar resultat 6 - 10 av 37 avhandlingar innehållade ordet upconversion.

  1. 6. Systematic Studies of Triplet Annihilating Species for Photochemical Upconversion

    Författare :Axel Olesund; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; triplet-triplet annihilation; solar energy conversion; photochemical upconversion;

    Sammanfattning : With climate change already setting new temperature records and causing more extreme weather events, transitioning to clean and renewable energy sources is more urgent than ever. Solar energy harvesting arguably holds the most promise with the abundance of terrestrial sunlight available. LÄS MER

  3. 7. Radiative Properties of Rare Earth Elements - Free and Bound in Crystals

    Författare :Huailiang Xu; Atomfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Laser Spectroscopy; Upconversion; Lifetimes; Atomic and molecular physics; Atom- och molekylärfysik; Laser technology; Laserteknik; Rare earth Elements; Fysicumarkivet A:2004:Xu;

    Sammanfattning : This thesis is devoted to fundamental aspects, and to spectroscopic applications of radiative properties in free atoms and ions, as well as in ions doped into crystals. Using the time-resolved laser-induced fluorescence technique, measurements of radiative lifetimes for rare earth elements have been performed in neutral Pr, Nd, Tm, and in singly ionized Sm, Er, Nd, Tm, Yb, as well as in doubly ionized Tm and Tb ions. LÄS MER

  4. 8. New Insights Regarding the Efficient Design of Photon Upconversion Systems

    Författare :Axel Olesund; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; fluorescence; solar energy conversion; semiconductor nanocrystals; intramolecular TTA; photon upconversion; photochemistry; triplet-triplet annihilation;

    Sammanfattning : The transition from fossil fuels to renewable energy sources is arguably the most important weapon in combating global climate change. Existing solar technologies could be significantly improved using unconventional ways of manipulating the solar spectrum. LÄS MER

  5. 9. Development of Nanoparticle Sensitized Solar Cells

    Författare :Chunze Yuan; Hans Ågren; Anders Hagfeldt; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; quantum dots; quantum rods; nanoparticles; solar cells; colloidal; type-II; electron extraction; alloy; organic electrolyte; energy relay; upconversion.;

    Sammanfattning : In this thesis, I have been working with the development of nanoparticle sensitized solar cells. In the subarea of quantum dot sensitized solar cells (QDSCs), I have investigated type-II quantum dots (QDs), quantum rods (QRs) and alloy QDs, and developed novel redox couples as electrolytes. LÄS MER

  7. 10. Vibrational and luminescence spectroscopy of polymer ionic materials

    Författare :Britta Mattsson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; polymer electrolytes; upconversion; raman scattering; ionic configurations; proton conducting membranes; luminescence spectroscopy;

    Sammanfattning : .... LÄS MER