Self-Assembled Three-Dimensional Architectures of Y<sub>2</sub>(WO<sub>4</sub>)<sub>3</sub>:Eu: Controlled Synthesis, Growth Mechanism, and Shape-Dependent Luminescence Properties
Bibliographic record
Abstract
Monoclinic Y<sub>2</sub>(WO<sub>4</sub>)<sub>3</sub>:Eu with three-dimensional hierarchical architectures were successfully synthesized by a hydrothermal method in ligand-free and chelating ligand-mediated processes, respectively. Microflowers assembled from two-dimensional nanoflakes were obtained in a surfactant- and template-free process, whereas microspheres with dandelion-like appearance assembled from one-dimensional nanoplates were observed upon the introduction of the appropriate amount of ethylenediamine tetraacetic acid (EDTA) to the precursor. X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), selected-area electron diffraction (SAED), energy-dispersive spectra (EDS), and photoluminescence (PL) spectroscopy were employed to characterize the as-obtained products. It was found that the amount of ligand agent, reaction temperature and time, and type of organic additive have crucial influences on the morphology of the resulting microstructures. The possible formation mechanisms for different microstructures were put forward. The addition of EDTA significantly changed the reaction pathway due to the excellent chelating and capping ability of EDTA. A detailed investigation on the photoluminescence of Y<sub>2</sub>(WO<sub>4</sub>)<sub>3</sub>:Eu samples with flower-like, dandelion-like, and spindle microstructures indicates that the optical properties of these phosphors are strongly dependent on the morphology and size. The dandelion-like structure exhibits the strongest red emission with high color purity.
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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 | 0.003 | 0.005 |
| Meta-epidemiology (narrow) | 0.004 | 0.003 |
| Meta-epidemiology (broad) | 0.006 | 0.002 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.004 | 0.002 |
| Research integrity | 0.002 | 0.001 |
| Insufficient payload (model declined to judge) | 0.017 | 0.004 |
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".