Excitons in perylene tetracarboxdiimide crystals for optoelectronics
Bibliographic record
Abstract
Abstract In this contribution, we present steady‐state and timeresolved photoluminescence measurements, as well as absorbance measurements, on dilute solutions and on solution‐grown crystals of a perylene tetracarboxdiimide derivative (EPPTC). We also present density functional theory (DFT) calculations of their electronic structure. These molecules self‐assemble into highly anisotropic needle‐shaped crystals with monoclinic structure, as revealed by X‐ray diffraction techniques and polarized optical microscopy. We find experimentally that the Huang‐Rhys factor for this molecule is 0.565, which is in good agreement with that extracted from ab initio calculations (0.678). We demonstrate that in a film, the nature of photoexcitations is a vibrationally dressed Frenkel exciton and that these recombine radiatively with a distribution of excited‐state constants centered at ∼ 1 ns–1. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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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 | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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; 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".