Visible Emission from GeO<sub>2</sub> Nanowires: Site-Specific Insights via X-ray Excited Optical Luminescence
Bibliographic record
Abstract
Crystalline GeO 2 nanowires synthesized by a flow deposition technique on a silica substrate emit intense and distinct luminescence. X-ray Excited Optical Luminescence (XEOL) stimulated by a synchrotron light source in the soft X-ray energy regime was used to monitor the optical emission from germanium oxide nanowires upon X-ray absorption with the excitation energy tuned across O K- and Ge L 3,2 -edges. XEOL spectra vary significantly at different edges. At the O K-edge, luminescence is characterized by green (∼520 nm) and red (∼780 nm) emission related to oxygen vacancies in the core of the nanowires and to structural defects on their surface. At the Ge L 3,2 -edge, emission is dominated by an intense violet peak at ∼400 nm mostly associated with defect centers at the interface between adjacent nanowires and with the silica substrate. The increasing attenuation lengths of soft X-rays tuned at excitation energies across the O K-edge (∼300 nm) and the Ge L 3,2 -edge (∼1 μm) enable the sampling of defects placed at different depths in the nanosized GeO 2 structures, down to the nanowire–SiO 2 interface. The use of tunable XEOL makes it possible to correlate excitation energy with the site-specific origin of luminescence and has provided direct evidence for the behavior of different structural defects in the visible emission from the GeO 2 nanowires. These results are of key interest to exploit the nanodimensional oxides in practical device applications.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".