Search for dissertations about: "nonradiative transitions"

Found 4 swedish dissertations containing the words nonradiative transitions.

2. 1. Theoretical Studies on Kinetics of Molecular Excited States

   Author : Feng Zhang; Yi Luo; Theodore S. Dibble; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Theoretical chemistry; Teoretisk kemi;

   Abstract : HTML clipboardKinetics on molecular excited states is a challenging subject in the field of theoretical chemistry. This thesis pays attention to theoretical studies on kinetics of photo-induced processes, including photo-chemical reactions, radiative and non-radiative transitions (intersystem crossing and internal conversion) in molecular and bio-related systems. READ MORE

4. 2. Optical Properties of Low Dimensional Semiconductor Materials

   Author : Tiantian Han; Ying Fu; Per-Olof Holtz; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Semiconductor; Low dimensional; optics; Physics; Fysik;

   Abstract : This dissertation presents a serial study on optical properties of different semiconductor materials. Three main types of studies are addressed: The role of doping levels of N and Al atoms in the room-temperature photoluminescence (PL) of 4H-SiC films for optoelectronic applications; the use of a basic Monte Carlo method combined with probability calculations of the time-dependent Schroedinger equation to manifest multi-photon absorption and emission of II-VI compound quantum dots (QDs) for bioimaging; a theoretical quantum chemistry approach to study of structure and optical properties of InGaAsN and GaAs clusters for laser technology applications. READ MORE

5. 3. Excitonic Effects and Energy Upconversion in Bulk and Nanostructured ZnO

   Author : Shula Chen; Irina Buyanova; Weimin Chen; Detlev M. Hofmann; Linköpings universitet; []
   Keywords : ;

   Abstract : Zinc Oxide (ZnO), a II-VI wurtzite semiconductor, has been drawing enormous research interest for decades as an electronic material for numerous applications. It has a wide and direct band gap of 3.37eV and a large exciton binding energy of 60 meV that leads to intense free exciton (FX) emission at room temperature. READ MORE

6. 4. Synthesis and Characterization of ZnO Nanostructures

   Author : Li Li Yang; Qingxiang Zhao; Magnus Willander; Jinghai Yang; Noel Magnea; Linköpings universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Zinc oxide; nanostructures; heterostructures; controllable growth; optical properties; postannealing; diffusion coefficient; Semiconductor physics; Halvledarfysik;

   Abstract : One-dimensional ZnO nanostructures have great potential applications in the fields of optoelectronic and sensor devices.  Therefore, it is very important to realize the controllable growth of one-dimensional ZnO nanostructures and investigate their properties. READ MORE