Photodeterioration of the silicon nanocrystal emission
Bibliographic record
Abstract
Photoluminescence (PL) of silicon nanocrystals (Si-nc) is investigated as a function of exposure time for several laser intensities. Both a strong decrease in luminescence and an energy shift are observed during the illumination period. Decay analysis of the PL emission intensity indicates two timescales: a short timescale (<0.5 min), associated with reversible sample heating effects and a longer timescale (>5 min), attributed to an irreversible sample damage caused by the laser excitation. Both sample heating and damage shift the PL emission toward the red. These longer timescale variations can significantly influence the precision of both PL and optical gain measurements performed at average pumping intensities as low as ∼1 W cm−2. The complex evolution of the Si-nc spectra after a long recovery period indicates that the permanent degradation of the PL signal results from the activation of several sample damaging mechanisms, whose possible origins are discussed.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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) | 0.002 | 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 source (direct Gemma or distilled Codex), 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".