Effect of codoping Ce <sup>3+</sup> on the luminescence properties of Sr <sub>9</sub> Mg <sub>1.5</sub> (PO <sub>4</sub> ) <sub>7</sub> :Eu <sup>2+</sup> orange–yellow phosphor
Bibliographic record
Abstract
Abstract Sr 9 Mg 1.5 (PO 4 ) 7 :Eu 2+ has recently been reported as a promising blue light‐excited orange–yellow phosphor that can be used in white LED device. Here, Ce 3+ ‐codoping is found to be an effective strategy to improve the luminescence performance of Sr 9 Mg 1.5 (PO 4 ) 7 :Eu 2+ phosphor. The coexistence of Eu 2+ and Eu 3+ ions has been verified via photoluminescence spectral analysis. The reduction of Eu 3+ to Eu 2+ in Sr 9 Mg 1.5 (PO 4 ) 7 lattice cannot be completed in a reducing atmosphere, but can be promoted through codoping with Ce 3+ ions to a great extent, which finally increase the effective concentration of Eu 2+ in the crystal lattice. The Eu 3+ −Eu 2+ reduction mechanism is analyzed using a charge compensation model. This work not only achieves enhanced luminescence of the Sr 9 Mg 1.5 (PO 4 ) 7 :Eu 2+ phosphor by codoping with Ce 3+ ions, but also provides new insights into the design of Ce 3+ /Eu 2+ codoped luminescent materials.
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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".