The effect of the surface of SnO2 nanoribbons on their luminescence using x-ray absorption and luminescence spectroscopy
- CLS
X-ray excited optical luminescence (XEOL) and x-ray absorption near-edge structure in total electron, x-ray fluorescence, and photoluminescence yields at Sn M{sub 5,4}-, O K-, and Sn K-edges have been used to study the luminescence from SnO{sub 2} nanoribbons. The effect of the surface on the luminescence from SnO{sub 2} nanoribbons was studied by preferential excitation of the ions in the near-surface region and at the normal lattice positions, respectively. No noticeable change of luminescence from SnO{sub 2} nanoribbons was observed if the Sn ions in the near-surface region were excited selectively, while the luminescence intensity changes markedly when Sn or O ions at the normal lattice positions were excited across the corresponding edges. Based on the experimental results, we show that the luminescence from SnO{sub 2} nanoribbons is dominated by energy transfer from the excitation of the whole SnO{sub 2} lattice to the surface states. Surface site specificity is not observable due to its low concentration and weak absorption coefficient although the surface plays an important role in the emission as a luminescence center. The energy transfer and site specificity of the XEOL or the lack of the site specificity from a single-phase sample is discussed.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 1006556
- Journal Information:
- J. Chem. Phys., Vol. 128, Issue 04, 2008; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- ENGLISH
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