Probing nanocrystal fluorescence dynamics from core, to surface, and beyond
Bibliographic record
Abstract
Semiconductor nanocrystals (NCs) have bright, narrow, and tunable emission across the visible and infrared. However, fundamental insight into NC photophysics is incomplete. At single-particle scales, NCs undergo fluorescence intermittency whereby photon emission switches between ON and OFF states with erratic kinetics. The range of timescales relevant to the excitonic lifecyle adds to the challenge of spectroscopically distinguishing between proposed mechanisms. Here, we demonstrate all-optical modulation of blinking statistics and discover that sub-bandgap light perturbs ON-times of NCs in a timescale-free manner. On the ensemble scale, NCs possess advantages when sensitizing spin-triplet states of surface-bound molecules for excitonic upconversion. In the energy transfer step, it remains unclear whether correlated transfer is outpaced by sequential electron transfer. Using tailored NC synthesis, we observe rich spectroscopic dynamics including the pervasive role of surface states.
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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) | 0.001 | 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".