3D Monodisperse Oligofluorenes with Non‐Conjugated Triphenylamine‐Based Cores: Synthesis and Optoelectronic Properties
Bibliographic record
Abstract
Abstract Two 3D monodisperse oligofluorenes with non‐conjugated triphenylamine‐based cores have been synthesized byFriedel–Crafts copolycondensation reaction. The oligomers, PF3‐TPA and PF3‐TPA3, consist of three fluorene pentamer arms that are connected non‐conjugately through a triphenylamine (TPA) and 1,3,5‐tris(triphenylamino)benzene core (TPA3), respectively, at the 9‐position of the central fluorene of the pentafluorene arms. The coplanar structures ofthe cores and the linkages at the centre of the pentafluorene arms produced a 3D structure of oligomers. This specific structure efficiently retarded the crystallization tendencies of the pentafluorene arms and gave the materials completely amorphous morphological structures. Both oligomers emit deep‐blue fluorescence with high efficiencies in thin films (φpl–film = 67 % for PF3‐TPA3 and 86 % for PF3‐TPA). The introduction of triphenylamine units into the core promoted the hole‐injection ability while not obviously scarificing the electron‐injection ability of the oligomers. The multi‐layer devices ITO/PEDOT‐PSS/PF3‐TPA3 and PF3‐TPA/TPBI/LiF/Al were fabricated to investigate the electroluminescence (EL) properties of the two oligomers. Both oligomers showed a low turn‐on voltage of 4 V. The luminances reached 1946 cd/m2 at 7.5 V in the PF3‐TPA3 device and 1055 cd/m2 at 8 V in the PF3‐TPA device. The EL efficiencies at this luminance were 1.63 and 1.57 cd/A, respectively.
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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) | 0.001 | 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".