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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 61 to 70 of 686 (0.013 seconds)| 61 |
Studies in the photochemistry of solid chlorophyllSummers, B. January 1957 (has links)
No description available.
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| 62 |
Radiation chemistry of carbohydrate systemsCriddle, William James January 1960 (has links)
No description available.
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| 63 |
The photochemical and thermal decomposition of ferric oxalateMcLennan, G. J. January 1962 (has links)
No description available.
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| 64 |
Synthetic aspects of cryogenic photolysesThomas, H. January 1968 (has links)
No description available.
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| 65 |
Angular dependence of high harmonic generation from impulsively aligned moleculesKajumba, Nathaniel Daniel January 2007 (has links)
No description available.
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| 66 |
Luminescence from actinides and actinyl ionsBradshaw, Rebecca January 2010 (has links)
No description available.
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| 67 |
Morphology and Efficiency of Polymer:Fullerene Solar CellsBeal, Richard January 2010 (has links)
No description available.
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| 68 |
Radiofrequency Magnetic Field Effects on Radical Pair Recombination ReactionsWedge, Christopher J. January 2009 (has links)
No description available.
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| 69 |
Ion Imaging, applications and extensionsJohnsen, Alexander January 2010 (has links)
No description available.
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| 70 |
Chemical Control of the Photoluminescent Properties of Up-Converting PhosphorsPedruelo, Maria del Puy Rebollo January 2006 (has links)
Up-conversion luminescence of Er3+ based phosphors was studied in the following host lattices: Y203, Gd20 3, Gd2_xYx03, and YV04, with a view to developing an understanding of how emission can be tailored by manipulating the local chemical environment of the activator ion. Laser induced luminescence measurements of Y203:Er phosphors showed evidence of Stokes and Anti-Stokes emission bands arising from excited levels under 632.8 nm radiation. Emission from 4F7I2~ 4115/2 transitions were found to be \yeaker in Gdz03 phosphors and were not dete~ted in YV04 hosts. Relative intensity of Stokes I Anti-Stokes radiation were studied as a function of the host lattice, and variations found as a consequence of crystal field changes in the activator environment. This work was extended to an investigation of the effect of co-dopants. Low levels of Yb3+ used as sensitizer, enhanced luminescence from 4F7I2~ 4115/2 and 4F912~ . 4~1512 transitions, and a novel relaxation mechanism involving energy transfer from excited states is proposed to account for the variation observed in the intensity of the emission bands. Eu3+ used as co-dopant produced energy loss due to resonant energy transfer. This phenomenon was demonstrated by undertaking thermal studies on YV04:Er,Eu co-doped phosphors. Enhancement of 4Hll/2 transitions from Er3+ ions in S6 symmetry sites was observed together with 4F7I2~ 4115/2 transition activation with increasing Eu3+ concentration. With a view to producing phosphor powders suitable for device application, wet chemical routes were investigated in order to prepare the materials studied in this work. The synthetic approaches studied were urea co-precipitation and combustion synthesis, the .. reaction conditions .were carefully manipulated in order to optimise the composition and morphology of the product. Spherical uniform particles in the 300 - 600 nm range were routinely prepared.
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