Light-Induced Evolution of Silicon Quantum Dot Surface Chemistry—Implications for Photoluminescence, Sensing, and Reactivity
Bibliographic record
Abstract
The photoluminescence of freestanding silicon quantum dots (QDs) responds rapidly to various gases in the atmosphere. Under short wavelength irradiation, the luminescence can change over a time frame of seconds to minutes and can feature orders-of-magnitude shifts in the luminescence intensity and rapid “jumps” in the peak wavelength. Starting with hydride-terminated Si QDs, the luminescence can be reversibly quenched or strongly activated, leading to a partly reversible, three-state luminescence condition consisting of regular, quenched, and activated states. These changes were characterized using photoluminescence spectroscopy, Fourier transform infrared spectroscopy, and electron spin resonance. The response is a multistep process involving several stages, including energy transfer, abstraction of hydrogen, and rapid optical-irradiation-assisted oxidation. These properties make freestanding Si QDs a potentially attractive material for optical sensor 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) | 0.001 | 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".