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Study of Luminescence Characteristics of Trivalent Terbium in Silicate GlassAn important use of silicate glasses doped with terbium oxide (Tb2O3) is their use as fiber optic sensors for high-resolution imaging applications requiring the detection of x-rays (e.g. tomography and radiography). The x-ray radiation is absorbed by the glass, producing electron-hole pairs (excitons). The excitons migrate through the glass matrix and then recombine, emitting characteristic Tb(3+) luminescence in the optical wavelength region. This emission is due to forbidden transitions of 4f electrons and therefore has a long decay time. Long decay time is undesirable when imaging transient events since it results in blurring in time of the images. It has been reported elsewhere that in crystals Tb(3+) ions can act both as luminescence centers and as fluorescence traps. These traps can capture excitons and delay their recombination. This delayed fluorescence is seen as a long lived, secondary component to the luminescence decay curve, or afterglow. Such a secondary decay component to the luminescence decay of Tb(3+) has been observed before in soda glass following pulsed optical excitation. In order to determine the conditions under which afterglow occurs, an understanding of the material's luminescent properties is required.
Document ID
19960003458
Acquisition Source
Headquarters
Document Type
Conference Paper
Authors
West, Mike S.
(College of William and Mary Williamsburg, VA., United States)
Armagan, Guzin
(College of William and Mary Williamsburg, VA., United States)
Winfree, William P.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
October 1, 1995
Publication Information
Publication: Second Annual Research Center for Optical Physics (RCOP) Forum
Subject Category
Nonmetallic Materials
Accession Number
96N13467
Funding Number(s)
CONTRACT_GRANT: NAG1-1597
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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