Structural and optical investigation of colloidal Ln3+/Yb3+ co-doped KY3F10 nanocrystals
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Bibliographic record
Abstract
We report for the first time the synthesis of colloidal Ln3+/Yb3+ co-doped KY3F10nanocrystals (Ln = Er or Eu) viathermal decomposition. The transmission electron microscopy (TEM) studies indicated that the average size of the nanocrystals was approximately 15 nm. The nanocrystals crystallized in the cubic Fmm space group as confirmed by Rietveld refinement of the X-ray powder diffraction patterns and by electron diffraction analysis. The Eu3+ ion was used as a spectroscopic probe and its emission spectrum in colloidal KY3F10nanocrystals showed that the lanthanide ions replaces Y3+ in the lattice structure. When co-doped with Er3+/Yb3+, colloidal KY3F10nanocrystals exhibited visible (green and red) upconversion emissions following 978 nm excitation with a near-infrared (NIR) diode laser. Power dependence studies indicated that a two-photon energy transfer upconversion process was responsible for the NIR-to-visible upconversion.
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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 | 0.001 |
| 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 | 0.001 |
| 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)
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Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
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