Enhanced Blue-Violet Emission from Poly(fluorene-<i>co</i>-thiophene) Host−Guest Systems
Bibliographic record
Abstract
Host−guest systems based on novel poly(fluorene- alt -thiophene) (PFT) polymers exhibiting enhanced solid-state blue-violet emission are presented. These polymers were synthesized via Suzuki polycondensation of 9,9-dihexylfluorene-2,7-bis(trimethyleneborate) with 3,4-dibromothiophene and/or 2,7-dibromo-9,9-dihexylfluorene. The host is a UV-violet-emitting, alternating 3,4-linked poly(fluorene- co -thiophene), and the guests are poly(9,9-dihexylfluorene) (PDHF) segments, which are prepared by either blending or copolymerization. In both cases, blue-violet emission is observed in the solid state. The solid-state quantum yields of luminescence (Φ pl ) are determined. Blended and copolymer systems showed a pronounced difference: Φ pl of blends were independent of polymer composition while copolymers were strongly composition-dependent. These differences are attributed to morphological differences, wherein blends are phase-segregated while the copolymer system are best described as solid solutions of the guest in the host. Copolymers gave up to 10-fold enhancement in the external quantum efficiency of electroluminescence compared to the case of PDHF.
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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 | 0.000 | 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) | 0.000 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".