Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 14 of 14 for “"Dark states"”.
-
Functional Imaging Through Dark State Dynamics
… harnesses the environmental sensitivity of the dark states of molecular fluorophores, both endogeneous in cells/tissue and externally introduced for mapping of chemical micro-environments including factors such as ion concentration and microviscosity. A novel technique for directly detecting the …
-
Light-Induced Collective Interactions in Arrays of Quantum Emitters
… the system hosts delocalized subradiant states, that is, coherent superpositions that are largely decoupled from the electromagnetic field and thus decay at suppressed rates. While this weak coupling makes subradiant states attractive for quantum technologies, it also renders them …
-
Spectroscopic investigations of intersystem crossing and triplet state structure in acetylene
… electronic state, T3. The predominantly T1,2 dark states observed in the SEELEM spectrum show the remarkable property of spectral regularity, in the sense that they are able to be arranged into smooth, well-behaved "vibrational levels" as judged from reduced rotational term value plots. This …
-
Intersystem crossing in acetylene : a mechanistic study
The triplet electronic states of acetylene and the intersystem crossing process that populates these states were studied using a second-generation, supersonic jet molecular beam machine with a multispectral capability. Surface Electron Ejection (SEELEM), Ultraviolet Laser Induced Fluorescence …
-
Ultrafast Transient Absorption and Multi-Wave Mixing Spectroscopies in the Extreme Ultraviolet and Soft X-RAY Regimes
… researchers to observe and manipulate electronic states within their natural attosecond, femtosecond, and picosecond timescales, thus providing a deeper understanding of the electronic processes that underpin structural changes, reaction pathways, and energy transfer in complex systems. By …
-
Exciton and Energy Transfer Dynamics in Hybrid Perovskite and Lanthanide Nanomaterials
… because they are usually the lowest-energy states and they show long lifetimes and diffusion lengths. However, triplet excitons are dark states. This makes harvesting triplet energy for optoelectronic applications difficult. This thesis focuses on fundamental study on: 1) Understanding the …
-
Photo Control of Protein Activity Using Genetically Encoded Photoswitches
… opto-DN-CREB binds selectively to CREB in the dark, and that photo-control of CREB activity in cells is possible. Chapter 4 uses phage display to select for light-switchable protein interactions. Small proteins that bind selectively to the light or dark states of PYP and Avena sativa …
-
Novel Bio-Imaging Techniques Based on Molecular Switching
… basically involves only two molecular states: the ground molecular state and the first singlet excited state (the fluorescent state). Astonishingly, it greatly diversified the applicability of fluorescence microscopy in many different ways by incorporating additional molecular states …
-
Efficient Organic Light-emitting Diodes with Singlet, Triplet and Doublet Excitons
… and doublets. Triplet excitons are regarded as dark states due to their spin-forbidden decay process, whereas effective triplet harvesting or triplet circumvention can help to improve the OLED performance. In this thesis, methods and mechanisms to avoid loss pathways were explored from the spin …
-
Synthesis and characterization of transparent conducting oxides for Stark e ect applications in single molecule spectroscopy
… (SMS) stemmed from our interest in the dark states of light harvesting complex II (LHCII) of plants. Investigation of this mechanism requires a Stark cell. The high optical quality required by the SMS procedure demands a very speci c thickness microscope slide at the objective to sample …
-
Singlet exciton fission-enhanced silicon photovoltaics: Interfacial engineering, device design and spectroscopic technique development
… and n-doped silicon, we show that defect-induced states in a thin interlayer of hafnium oxynitride that lie near the band edge of silicon are beneficial for triplet exciton transfer. We also identify that triplet-induced electric field-effect passivation is beneficial for the triplet sensitization …
-
Controlling Triplet Excitons in Organic Semiconductors with Lanthanide-Doped Nanoparticles
… processes, in which electronically excited states mediate light absorption, emission, and charge generation. Triplet excitons play a central role in determining the excited-state dynamics of OSCs under both optical and electrical excitation. However, in most closed-shell OSCs, triplet …
-
Modeling Dark- and Light-Induced Crystal Structures and Single-Crystal Optical Absorption Spectra of Ruthenium-Based Complexes that Undergo SO2-Linkage Photoisomerization
… by photoisomerization of metastable photoinduced states, which are metastable if kept at suitably low temperatures. This illustrates the possibility of these materials to operate as nanotechnological devices themselves, with the potential for optical actuation, optical-signal processing and …
-
A new apparatus to simulate fundamental interactions with ultracold atoms
… where the two components correspond to internal states of sodium atoms. The coherent mixture, in the miscible regime, also exhibits a metastable excitation consisting in a domain wall of relative phase connecting vortices of different components. Due to the peculiar energy dependence of such a …