Significant Variations in the Luminescence of Samarium(II) Doped Strontium and Barium Octaborate as a Function of Excitation Wavelength and Sample Temperature
Abstract
The emission features characteristic of divalent samarium formed in samarium-doped barium octaborate (BaB8O13) and strontium borate (Sr2B16O26) have been studied as a function of excitation wavelength and sample temperature. The emission spectra of divalent samarium in both materials exhibit a surprisingly strong temperature dependence. When divalent samarium is doped into BaB8O13, changes in excitation wavelength and sample temperature both result in significant variations in the emission features associated with the material. It is therefore hypothesized that the variation arises primarily from selected excitation of individual samarium sites within the BaB8O13 matrix. The emission features characteristic of divalent samarium in Sr2B16O26, also exhibited significant variation as the sample temperature was lowered, but this variation was irrespective of the excitation wavelength. This appears to indicate dependence solely on competition between de-excitation pathways.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Dec 07, 2018
- Source ID
- 10.1177/0003702818815180
Entities
People
- Christopher H. Drozdowski
- Jafar Gharavi-naeini
- Nathan A Stump
- Shakeena L. Walker
Organizations
- Army Research Office
- Winston-Salem State University