Excitonic luminescence of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>Br</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>-intercalated layered semiconductors<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>2</mml:mn><mml:mi>H</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mi>WS</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
Bibliographic record
Abstract
Radiative recombination processes in the transition metal dichalcogenide compound $2H\text{\ensuremath{-}}{\mathrm{WS}}_{2}$ are investigated. The strong sharp line photoluminescence in the spectral range 1.32--1.34 eV is attributed to the recombination of excitons bound on electron-attractive neutral centers, formed by ${\mathrm{Br}}_{2}$ molecules intercalated in the van der Waals gap of the $2H\text{\ensuremath{-}}{\mathrm{WS}}_{2}$ layered crystals. These centers, located at energy ${E}_{T}=0.1\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ below the conduction band, display properties similar to the acceptorlike isoelectronic traps in GaP or Si, providing efficient radiative recombination. The temperature dependence of the zero-phonon spectral line intensities and of the luminescence decay time is described in the framework of a kinetic model in thermal equilibrium conditions. The atypical temperature increase of the luminescence decay time in the temperature range $T=2\text{--}7\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ is related to the presence of a long lifetime sublevel, situated at 0.3 meV above the lowest excitonic state. The observed broadband emission centered at 0.97 eV is ascribed to recombination via a deep center due to an instrinsic defect of the layered crystal.
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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 | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.007 | 0.001 |
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".