Spectroscopic characterizations of rare earth doped ceramics, nanocrystals, nanocrystal embedded polymeric hosts and their potential applications

dc.contributor.advisorSardar, Dhiraj K.
dc.contributor.authorNash, Kelly LaTrice
dc.contributor.committeeMemberGruber, John B.
dc.contributor.committeeMemberChen, Chonglin
dc.contributor.committeeMemberChen, Liao Y.
dc.contributor.committeeMemberKoinov, Zlatko
dc.date.accessioned2024-02-12T18:28:06Z
dc.date.available2024-02-12T18:28:06Z
dc.date.issued2009
dc.descriptionThis item is available only to currently enrolled UTSA students, faculty or staff. To download, navigate to Log In in the top right-hand corner of this screen, then select Log in with my UTSA ID.
dc.description.abstractTrivalent rare earth (RE<super>3+</super>) ions have been used as an activator in laser host materials and in a wide variety of photonic applications. Of the competing hosts, one of the most well studied and successful host has been yttrium aluminum garnet Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub> (YAG). In comparison to YAG, yttrium oxide (Y<sub>2</sub>O<sub>3</sub>) has shown promise as a potential laser medium due to its excellent optical, thermal and mechanical properties. As single crystals, Y<sub>2</sub>O<sub>3</sub> system can be extremely difficult to grow due to the high melting temperature (~2200 °C) of the host. Alternatively, ceramic and nanocrystalline forms of Y<sub>2</sub>O<sub>3</sub> have contributed to renewed interest in the material as laser host and more recently in biological and other photonic applications due to simplicity of fabrication. This work focuses on four RE<super>3+</super> ions, namely erbium, neodymium, holmium, europium doped into Y<sub>2</sub>O<sub>3</sub> and are selected due to their multi-frequency absorption properties and visible to near infrared emission characteristics. The chosen nanocrystalline material are embedded or coated in polymers that are biocompatible resulting in visible to near infrared fluorescent polymers. These materials are characterized through morphology studies and spectroscopic analyses of the absorption and emission spectra. Judd-Ofelt (J-O) and Crystal-Field (CF) techniques are applied to the systems and the results are compared to single crystal and ceramic forms and in some cases these analyses are reported for the first time for this host. Results of these analyses show that the addition of near infrared emitting rare earth nanocrystals to these polymers offers an attractive application to their existing biological applications.
dc.description.departmentPhysics and Astronomy
dc.format.extent109 pages
dc.format.mimetypeapplication/pdf
dc.identifier.isbn9781109538182
dc.identifier.urihttps://hdl.handle.net/20.500.12588/4669
dc.languageen
dc.subjectCrystal-Field
dc.subjectJudd-Ofelt
dc.subjectPolymers
dc.subjectRare Earths
dc.subjectYttrium Oxide
dc.subject.classificationOptics
dc.subject.classificationElectromagnetics
dc.subject.classificationCondensed matter physics
dc.titleSpectroscopic characterizations of rare earth doped ceramics, nanocrystals, nanocrystal embedded polymeric hosts and their potential applications
dc.typeThesis
dc.type.dcmiText
dcterms.accessRightspq_closed
thesis.degree.departmentPhysics and Astronomy
thesis.degree.grantorUniversity of Texas at San Antonio
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy

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