Walker Shakeena L, Drozdowski Christopher H, Gharavi-Naeini Jafar, Stump Nathan A
Department of Chemistry, Winston-Salem State University, Winston-Salem, NC, USA.
Appl Spectrosc. 2019 May;73(5):550-555. doi: 10.1177/0003702818815180. Epub 2018 Dec 7.
The emission features characteristic of divalent samarium formed in samarium-doped barium octaborate (BaBO) and strontium borate (SrBO) 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 BaBO, 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 BaBO matrix. The emission features characteristic of divalent samarium in SrBO, 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.
对掺钐的八硼酸钡（BaBO）和硼酸锶（SrBO）中形成的二价钐的发射特性进行了研究，该特性是激发波长和样品温度的函数。两种材料中二价钐的发射光谱均表现出惊人的强烈温度依赖性。当二价钐掺入BaBO中时，激发波长和样品温度的变化都会导致与该材料相关的发射特性发生显著变化。因此，据推测，这种变化主要源于BaBO基质内单个钐位点的选择性激发。随着样品温度降低，SrBO中二价钐的发射特性也表现出显著变化，但这种变化与激发波长无关。这似乎表明仅取决于去激发途径之间的竞争。
