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 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 | 0.005 | 0.005 |
| Meta-epidemiology (narrow) | 0.003 | 0.005 |
| Meta-epidemiology (broad) | 0.002 | 0.006 |
| Bibliometrics | 0.001 | 0.004 |
| Science and technology studies | 0.004 | 0.006 |
| Scholarly communication | 0.004 | 0.004 |
| Open science | 0.008 | 0.007 |
| Research integrity | 0.005 | 0.004 |
| Insufficient payload (model declined to judge) | 0.323 | 0.011 |
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".