Sökning: "luminescence spectroscopy"

Visar resultat 1 - 5 av 44 avhandlingar innehållade orden luminescence spectroscopy.

  1. 1. 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. 2. 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

  4. 3. Luminescence Spectroscopy For Biomedical Applications

    Författare :Monirehalsadat Mousavi; Atomfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; biomedical optics; fluorescence; photodynamic therapy; optical properties; ; dosimetry; in vivo measurement; upconverting nanoparticles; Quantum yield; Fysicumarkivet A:2019:Mousavi;

    Sammanfattning : This work presents optical methods utilizing visible light for characterization of biological tissue during diagnostics and treatment processes. The main aim has been to improve the therapeutic outcome of treatment modalities in in vivo studies. LÄS MER

  5. 4. Dynamic local structural symmetries and luminescence properties of the yellow emitting phosphor Ce3+-doped Y3Al5O12

    Författare :Yuan-Chih Lin; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; free electron laser; neutron scattering; vibrational spectroscopy; phosphor; light emitting diode; luminescence; thermal quenching; garnet;

    Sammanfattning : This thesis centers on investigations of the local structure and vibrational properties of the oxide garnet Y3Al5O12 (YAG), which when substituted with a few percent of the activator ion Ce3+ to replace Y3+ (Y3−xCexAl5O12, YAG:Ce3+) is one of the most important phosphors for solid state lighting. The study builds on a comprehensive analysis of the nature of the phonons and localized vibrational modes in YAG:Ce3+ and how these depend on the Ce3+ concentration and temperature and how they affect key optical properties, such as the intensity and frequency of the emitted light. LÄS MER

  7. 5. Polymer Ionic Materials: A Study of new Materials for Solid Polymer Fuel Cells and Rechargeable Polymer Batteries

    Författare :Britta Mattsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; PPO; polystyrene; neutron scattering; poly propylene oxide ; PEO; polymer electrolytes; poly vinylidene fluoride ; poly ethylene oxide ; luminescence; Raman spectroscopy; proton conducting polymer; poly styrene sulfonic acid ; PVDF;

    Sammanfattning : Ion-containing polymeric materials are interesting for use in a wide variety of applications, where the flexible, yet mechanically stable, polymer matrix is essential. Intensive research is presently going on worldwide for applications as electrolytes in solid polymer batteries and fuel cells, where the ion-conducting polymer also serves as an electrode separator. LÄS MER