Understanding the Photophysical Properties of the Polyoxotitanates Ln<sub>2</sub>Ti<sub>4</sub>O<sub>6</sub>(phen)<sub>2</sub>(met)<sub>10</sub>
Bibliographic record
Abstract
High Resolution Image Download MS PowerPoint Slide Understanding and tuning the luminescent properties of lanthanide(III) ions is of great interest for a range of optical applications, for example photo down-shifters for photovoltaics. In this work a series of isostructural polyoxotitanates (POTs) of general formula Ln 2 Ti 4 O 6 (phen) 2 (met) 10 ( Ln 2 Ti 4, Ln = Nd, Sm–Er, Yb, met = methacrylate) was synthesized, where the lanthanide is coordinated to a titanium-oxo core and the antenna ligand 1,10-phenanthroline (phen). The energies of the ligand S 1 and T 1 states in the Ln 2 Ti 4 series were determined, which, together with the luminescence spectra of the Ln 2 Ti 4 compounds, gave new insights into the intramolecular energy-transfer mechanism and efficiencies between the ligand periphery and the Ln 3+ ions. The effect of the rigidity of the Ti 4 O 6 -core on the coordination environment of a lanthanide was quantified for the first time using lifetime measurements, which shows a significant increase of Δτ = 1.1 ms for Eu 2 Ti 4 compared to the reference Eu 2 (phen) 2 (met) 6 ( Eu 2 ), in which no metal-oxo core is present. This key finding illustrates the advantage in designing lanthanide-based lumiphores containing rigid metal-oxide cores.
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How this classification was reachedexpand
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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.000 | 0.002 |
| Science and technology studies | 0.002 | 0.002 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| 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 itClassification
machine, unvalidatedMachine predicted; both teacher heads agree on what is shown here.
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".