Optical and luminescent properties of undoped and rare-earth-doped Ga<sub>2</sub>O<sub>3</sub>thin films deposited by spray pyrolysis
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Bibliographic record
Abstract
Spray pyrolysis was used to prepare polycrystalline thin films of undoped Ga2O3, as well as those doped separately with Eu3+, Tb3+ and Tm3+. The energy gap values of the as-grown films and those annealed at 600\r{}C and 900\r{}C were found to be 4.75, 4.48 and 4.44 eV, respectively. Films containing Eu3+ and Tb3+ exhibited red and green cathodoluminescence (CL), respectively. The CL of Ga2O3 : Tm mainly showed a broad band in the blue-green region, which resulted from the emission by both the Ga2O3 host and Tm3+. The broad blue-green emission band was divided into three Gaussian peaks at 424 nm (2.92 eV), 497 nm (2.49 eV) and 526 nm (2.36 eV). The CL intensity of undoped Ga2O3 thin films depended on the annealing ambient and temperature, suggesting that it is associated with the presence of oxygen vacancies. Mechanisms responsible for the broad blue-green emission of undoped Ga2O3 thin films were explored.
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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) | 0.001 | 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