Type of Document	Master's Thesis
Author	Trice, Brian Edward
Author's Email Address	btrice@bellatlantic.net
URN	etd-01162001-103454
Title	Nonlinear Luminescence Quenching in Eu2O3
Degree	Master of Science
Department	Chemistry
Advisory Committee	Advisor Name Title Tissue, Brian M. Committee Chair Anderson, Mark R. Committee Member Deck, Paul A. Committee Member
Keywords	Europium Oxide Lanthanide
Date of Defense	2000-12-14
Availability	unrestricted
Abstract Nonlinear Luminescence Quenching in Eu2O3 by Brian Trice ABSTRACT Nonlinear luminescence quenching has been documented in numerous systems such as organic crystals, rare earth insulators, laser materials, semiconductors, and phosphors. In each of these systems nonlinear luminescence quenching occurs under conditions of high excitation density from interactions between excited centers, the result is an additional nonradiative decay pathway that lowers luminescence quantum efficiency. During investigations into the spectra and dynamics of Eu2O3, an apparent saturation dip in the excitation spectra of nano-sized Eu2O3 particles was observed. This thesis describes the investigation into the nature of the saturation effect. The samples studied using luminescent spectroscopy included micron sized Eu2O3 crystals of both cubic and monoclinic phases, nanocrystal monoclinic Eu2O3, and a large fused crystal of monoclinic Eu2O3. It was determined that the saturation effect was due to nonlinear luminescence quenching occurring at the wavelengths of absorption maxima. The mechanism of nonlinear luminescence quenching was concluded to be upconversion by energy transfer.
Files	Filename       Size       Approximate Download Time (Hours:Minutes:Seconds)     28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access    00contents.PDF 14.97 Kb 00:00:04 00:00:02 00:00:01 < 00:00:01 < 00:00:01   01chapter1.pdf 101.31 Kb 00:00:28 00:00:14 00:00:12 00:00:06 < 00:00:01   02chapter2.pdf 104.63 Kb 00:00:29 00:00:14 00:00:13 00:00:06 < 00:00:01   03chapter3.PDF 540.57 Kb 00:02:30 00:01:17 00:01:07 00:00:33 00:00:02   04chapter4.pdf 11.71 Kb 00:00:03 00:00:01 00:00:01 < 00:00:01 < 00:00:01   05Appendix.PDF 64.12 Kb 00:00:17 00:00:09 00:00:08 00:00:04 < 00:00:01   06Vita.pdf 6.15 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   Abstract.PDF 4.75 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01

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