Synthesis and luminescent properties of Ca_8MgY(PO_4)_7:Re~(3+)(Re~(3+)=Eu~(3+),Ce~(3+),Tb~(3+)) phosphors
Bibliographic record
Abstract
β-Ca3(PO4)2 structured Ca8MgY(PO4)7∶Re3+(Re3+=Eu3+,Ce3+,Tb3+)has been prepared by solid state method.The results of XRD,FT-IR,and TG-DSC characterization indicated that the optimum synthesis temperature was at 1 200℃.PL characterization indicated that under 252nm ultraviolet irradiation,Ca8MgY(PO4)7∶Eu3+ phosphor showed the characteristic emission of Eu3+,dominated by the emission at 612nm,which was ascribed to 5 D0-7 F2 transition of Eu3+,the optimum doping concentration of Eu3+ was 5.0mol%.Under 295nm ultraviolet irradiation,Ca8MgY(PO4)7∶Ce3+ phosphor showed a band emission with maximum at 363nm,which was originated from 5d1-4f1 transition of Ce3+,the optimum doping concentration of Ce3+ was 1.0mol%.Under the irradiation of ultraviolet at 228nm,the emission of Ca8MgY(PO4)7∶Tb3+ was dominated by blue emission ascribed to 5D3-7FJat lower doping concentration,while at higher concentration,the emission was dominated by green emission ascribed to 5D4-7FJ.This phenomenon was due to the crossing-relaxation of Tb3+.The optimum doping concentration of Tb3+ was 7.0mol%.
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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".