Synthesis and Up-Conversion Luminescence Properties of Er~(3+)/Yb~(3+) Codoped SrF_2 Nanocrystals
Bibliographic record
Abstract
Nanocrystals of up-conversion phosphor Er3+ and Yb3+ co-doped SrF2 were prepared by hydrother malmethod using Polyethylene Glycol as dispersant.Under 980 nm laser diode excitation,the impact of different concentration of Er3+ ions on the up-conversion luminescence intensity was discussed.The up-conversion mechanism and processes were also analyzed.Ground state absorption,excitation state absorption and energy transfer were used in discussing the up-conversion mechanism of the sample and up-conversion mechanism models of sample was discussed in detail.The sample was characterized by transmission electron microscopy(TEM) and X-ray diffraction(XRD).The results showed that the sample was successfully synthesized by hydrothermal method at 180 ℃ and the average grain size is about 50 nm.When cYb3+∶cEr3+is 4∶1 and the doped concentration of Er3+ ions is 1.3mol%,the up-conversion intensity get the most.
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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".