Significant Suppression of Spontaneous Emission in SiO<sub>2</sub> Photonic Crystals Made with Tb<sup>3+</sup>-Doped LaF<sub>3</sub> Nanoparticles
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Bibliographic record
Abstract
SiO 2 inverse opals made with LaF 3:Tb 3+ nanoparticles were fabricated. The spontaneous emission lifetime of the 5 D 4 → 7 F 4 transition of Tb 3+ ions at 542 nm embedded in the SiO 2 inverse opal structure was determined. In contrast to an average lifetime of 2.8 ms in photonic crystals when the photoluminescence of the Tb 3+ envelop was located outside the photonic stop band, a lifetime of 4.0 ms was observed when the Tb 3+ photoluminescence fully overlaps with the photonic stop band in the inverse opal. The obtained results demonstrate that the photonic structure affects the spontaneous emission significantly, resulting in a 40% increase of the luminescence lifetime of Tb 3+ ions. In other words, the density of optical states is reduced at the emission frequency of Tb 3+ (i.e., 542 nm) which reduces the radiative rate constant.
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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 | 0.001 | 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 | 0.001 |
| 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 it