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.
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Showing 1 to 12 of 12 for “"luminescence efficiency"”.
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Singlet oxygen generating luminescent lanthanide complexes with naphthalimide-based and oligothiophene-based sensitizers
… fields, as they can provide cytotoxicity and luminescence using light excitation. Because of the interest in these compounds, systematic studies were used to help understand structure-property relationships. This work aims to synthesize and characterize multiple families of LnIII complexes …
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Efficient light emitting devices utilizing CdSe(ZnS) quantum dots in organic host matrices
We demonstrate efficient electroluminescence from thin film structures containing core-shell CdSe(ZnS) quantum dots dispersed in molecular organic host materials. In the most efficient devices, excitons are created on the quantum dot sites via energy transfer from organic host molecules, and direct …
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Exploiting and Inhibiting Ion Migration to Control Luminescence in Halide Perovskites
… perovskite films, with substantially enhanced luminescence efficiency observed in these materials. We perform a range of experimental characterisations to understand these changes in photo-physical properties of the perovskite materials under light illumination. Although the brightening effect …
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Effect of size and surface structure manipulation on the luminescent properties of silicon nanoclusters
… in size below 3 nm in diameter. The efficient luminescence of the material was studied and interpreted through the existing luminescence models. Surface modifications leading to functionalization were carried out. Both structural and luminescent characteristics of the modified clusters were …
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Izovalentiškai legiruotų cinko selenido scintiliacinių kristalų priemaišinės liuminescencijos tyrimai /
… is aimed at the investigation of defect-related luminescence mechanisms in isoelectronically doped semiconductor ZnSe scintillators. The study provides a deeper insight into the basic mechanisms of defect-related luminescence in these scintillation crystals and to relate the luminescence …
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Izovalentiškai legiruotų cinko selenido scintiliacinių kristalų priemaišinės liuminescencijos tyrimai /
… is aimed at the investigation of defect-related luminescence mechanisms in isoelectronically doped semiconductor ZnSe scintillators. The study provides a deeper insight into the basic mechanisms of defect-related luminescence in these scintillation crystals and to relate the luminescence …
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Investigation of optical and imaging characteristics of fluorescent screens for use in digital imaging detectors suitable for telemedicine
… quality and the patient’s dose. By comparing the luminescence efficiency and image quality properties of Lu2SiO5:Ce, Gd2O2S:Eu and Gd2O2S:Tb, the scintillating screen with the optimum characteristics was defined and placed, in close contact with the CMOS photodiode. MTF and DQE of our CMOS sensor …
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Molecular design of conjugated polymers for the control of conformation, electronics and self-assembly
… phosphorescent polymers that exhibit high luminescence efficiency under ambient conditions (Chapter 3). The luminescent properties of these platinum complexes are attributed to the introduction of steric bulk that prevents the formation of quenched aggregates. The donor-acceptor strategy to …
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High quality metamorphic graded buffers with lattice-constants intermediate to GaAs an InP for device applications
… achieved at or around this composition. Photoluminescence (PL) measurements were carried out on InGaAs quantum wells (QWs) that were re-grown on these buffers, and high luminescence efficiency was observed in the 1.2-1.5 tm wavelength range. Ridge waveguide QW-separate confinement …
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Photoluminescence studies of single-walled carbon nanotubes: Chirality-resolved length characterization and porphyrin sensitized electronic energy transfer
Photoluminescence spectroscopy has emerged as a powerful technique for characterizing the structure and optical properties of single-walled carbon nanotubes (SWCNT). While SWCNT diameter and chirality information is now routinely available from photoluminescence spectral analysis, the other primary …
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Development of hybrid inorganic-organic light-emitting devices with metal oxide charge transport layers
… (PhOLEDs) with nearly 100% internal quantum efficiency including other properties such as self emitting, high luminescence efficiency, broad wavelength range, wide viewing angle, high contrast, low power consumption, low weight, and large emitting area are gaining popularity in both academic …
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Luminescence characteristics of single and multiple aluminum gallium arsenide-gallium arsenide quantum-well heterostructure lasers
The luminescence properties of single and multiple A1x Gal-x As-GaAs quantum-well heterostructure lasers grown by meta10rganic chemical vapor deposition (MO-CVD) are shown to differ markedly from those of conventional double heterojunctions because of the two-dimensional nature of the active …