RARE-EARTH AND ALKALINE-EARTH HALIDES WITH SCINTILLATION ACTIVATORS AND CO-DOPANTS STUDIED BY PICOSECOND OPTICAL ABSORPTION SPECTROSCOPY

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.

Grantor dc:publisher

Wake Forest University

Year dc:date.issued

2019

Author dc:creator

• Li, Peiyun

• Carrier generation & recombination

Language dc:language.iso

en

Handle dc:identifier.uri

http://hdl.handle.net/10339/93909

OAI identifier oai:identifier

oai:wakespace.lib.wfu.edu:10339/93909