RARE-EARTH AND ALKALINE-EARTH HALIDES WITH SCINTILLATION ACTIVATORS AND CO-DOPANTS STUDIED BY PICOSECOND OPTICAL ABSORPTION SPECTROSCOPY
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Item Details
- title
- RARE-EARTH AND ALKALINE-EARTH HALIDES WITH SCINTILLATION ACTIVATORS AND CO-DOPANTS STUDIED BY PICOSECOND OPTICAL ABSORPTION SPECTROSCOPY
- author
- Li, Peiyun
- abstract
- Recent discoveries of rare-earth and alkaline-earth halides with scintillation activators and co-dopants showing excellent properties for spectroscopic gamma radiation detection attract a surge in research activity on their scintillation mechanisms. There is still much to learn about excited states in these materials. Understanding behaviors of the free carries and excitons in the first picoseconds are crucial for determining the speed and nonlinearity of response. Questions remain on whether and when the free electrons are trapped on holes, dopants or defects. The nature of interaction and recombination between the photon-excited species are also important. In this thesis, the crucial early evolution of excited populations is studied with picosecond spectroscopy of optical absorption induced by interband excitation.
- subject
- Carrier generation & recombination
- Defects
- Excitons
- Scintillators
- Transient absorption spectroscopy
- Ultrafast pump-probe spectroscopy
- contributor
- Williams, Richard T (committee chair)
- Ghadiri, Elham (committee member)
- David, Carroll L (committee member)
- Üçer, Kamil Burak (committee member)
- Gulthold, Martin (committee member)
- date
- 2019-05-24T08:35:30Z (accessioned)
- 2020-05-23T08:30:20Z (available)
- 2019 (issued)
- degree
- Physics (discipline)
- embargo
- 2020-05-23 (terms)
- identifier
- http://hdl.handle.net/10339/93909 (uri)
- language
- en (iso)
- publisher
- Wake Forest University
- type
- Dissertation