Composition‐dependent Eu <sup>3+</sup> emission in colloidal lead‐free halide perovskite nanocrystals: potential for anti‐counterfeiting applications
Why this work is in the frame
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Bibliographic record
Abstract
Abstract Trivalent europium is a well‐known phosphorescent probe widely used in lighting devices and displays, bioassay markers, and anti‐counterfeiting phosphors. Double halide perovskite nanocrystals (DHP NCs) have emerged in recent years as attractive host lattices for various luminescent lanthanide dopants owing to the diverse range of trivalent substitutional sites. However, the effect of the DHP NC composition on the Eu 3+ emission properties has not been systematically investigated. In this work, we prepared a series of DHP NCs containing Eu 3+ by employing a modified colloidal hot injection procedure. The nanocrystals exhibit finely tunable Eu 3+ 5 D 0 − 7 F J emission peaks, owing to the different dependence of the electric and magnetic dipole f‐f transitions on the coordination symmetry of Eu 3+ . A variation in the values of the Eu 3+ asymmetry factor, defined as 7 F 2 / 7 F 1 peak intensity ratio, between 1.0 and 2.5 was observed for different NC compositions, compared to ca. 5 for Eu 3+ in an aqueous solution. The asymmetry factor was also found to be dependent on the Eu 3+ doping concentration for a given DHP NC host lattice. The sensitivity of the relative intensities of Eu 3+ emission peaks on the DHP NC composition, together with the dual emission of these NCs, is promising for various anti‐counterfeiting applications.
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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 | 0.000 | 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) | 0.000 | 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