Luminescence in Lithium Borates

Author

Brant E. Kananen

Date of Award

9-2017

Document Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Department

Department of Engineering Physics

First Advisor

John W. McClory, PhD.

Abstract

Spectrometry methods are used to identify and characterize point defects in single crystals of lithium tetraborate (Li₂B₄O₇) and lithium triborate (LiB₃O₅) doped with silver or copper, and explore the role of these point defects in luminescence. New defects are identified in Ag-doped including: lithium vacancy substitutional-silver-ion defect-pairs (hole trap); isolated lithium vacancies (hole trap); isolated oxygen vacancies (electron trap); interstitial-silver-ion substitutional-silver-ion defect pairs (electron trap); isolated interstitial silver ions (electron trap); and interstitial-silver-ion lithium-vacancy defect pairs (electron trap). Defect models are proposed, and adjustments made to defect models known defects. Defects in Ag-doped LiB₃O₅ and Cu-doped LiB₃O₅ are identified including: two species of interstitial-silver-ions (electron traps); isolated-substitutional-silver-ion (hole trap); lithium vacancy substitutional-silver-ion defect pairs (hole trap); interstitial-silver-ion substitutional-silver-ion defect pairs (electron trap); a species of interstitial-copper-ion (electron trap); isolated-substitutional-copper-ion (hole trap); and lithium vacancy substitutional-copper-ion defect pairs (hole trap). Based on this assessment, Ag-doped LiB₃O₅ is a promising TL and OSL dosimetry material while Cu-doped LiB₃O₅ is not.

AFIT Designator

AFIT-ENP-DS-17-S-027

DTIC Accession Number

AD1055547

Comments

Approved for public release. PA case number on file.

Recommended Citation

Kananen, Brant E., "Luminescence in Lithium Borates" (2017). Theses and Dissertations. 773.
https://scholar.afit.edu/etd/773