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General Information
| Full name | Poly(9,9-dioctylfluorene-alt-benzothiadiazole) |
| Synonyms |
|
| Chemical formula | (C35H42N2S)n |
| CAS number | 210347-52-7 |
| HOMO / LUMO | HOMO = -5.9 eV, LUMO = -3.3 eV [2] |
| Classification / Family | Polyfluorenes, Benzothiodiazoles, Organic semiconducting materials, Semiconducting polymers, OLED green emitter materials, OLED materials, Organic Photovoltaic materials, Polymer solar cells, OFET materials |
Product Details
| Purity | > 99.9% |
| Mw | > 230,000 g/mol |
| Appearance | Orange powder |
Batch History
| Batch No. | Mw (g/mol) | Mn (g/mol) | PDI |
|
|---|---|---|---|---|
| 20181206 | 237,460 | 87,620 | 1.70 | |
| 20160113 | 376,200 | 221,300 | 1.70 |
|
| 20150430 | 253,600 | 120,200 | 2.11 |
|
| 20150423 | 240,600 | 123,400 | 1.95 |
|
Applications
A widely used green emitting reference polymer for a variety of applications including as an emissive species in OLEDs [1], an approximately balanced p-type and n-type polymer for OFETs [2] and light emitting transistors [3] as well as being used a polymeric accepter for OPVs [1]. The deep lying HOMO and LUMO levels (5.9 / 3.3 eV) make it air stable while the liquid-crystalline and beta phases make it widely used for basic research purposes.
| Device structure | ITO/PEDOT:PSS/TFB/F8BT/F8imBT-Br*/Ca/Al [4] |
| Colour |
Green 
|
| Max. EQE | 5.1% |
| Max. Current Efficiency | 17.9 cd/A |
| Max. Power Efficiency | 16.6?lm?W?1 |
Usage Datasheet
For a high efficiency green OLED we recommend blending F8 (PFO) with F8BT with the below specifications. This ink can then be deposited either in air or in a glovebox with little difference in performance, provided that the exposure time and light levels are minimised. For more details see our fabrication guide.
At typical concentrations of 10 mg/ml 100 mg of F8 (PFO) will make around 200 spin-coated devices on Ossila's standard ITO substrates (20 x 15 mm) assuming 50% solution usage (50% loss in filtering and preparation).
OLED reference device:
- F8 with F8BT
- Blend ratio of 19:1 (F8:F8BT) in Toluene
- Total concentration of 10 mg/ml
- 0.45 μm PTFE (hydrophobic) filter
- Spun at 2000 rpm (approx. 70 nm thickness)
Pipetting 20 μl of the above solutions onto a substrate spinning at 2000 rpm should provide a good even coverage with approximately 70 nm thickness. The substrate needs to be spun until dry, which is typically only a few seconds — 15 seconds should be ample to achieve this. Thermal annealing should be undertaken at 80°C for 10 minutes prior to cathode deposition
A basic but efficient OLED can be made using PEDOT:PSS as a hole transport layer and Calcium/Aluminium as the electron contact. When used with the Ossila ITO substrates and shadow masks this produces an easy to fabricate yet efficient >100 cd/m2) device.
Literature and References
Please note that Ossila has no formal connection to any other authors or institutions in these references.
- Conjugated-Polymer Blends for Optoelectronics. C.R. McNeill et al., Advanced Materials, Vol 21, Issue 38-39, 3840 (2009)
- Electron and hole transport in poly(fluorene-benzothiadiazole). Y. Zhang et al., Appl. phys. Lett., Vol 98, 143504 (2011)
- Organic Light Emitting Field Effect Transistors: Advances and Perspectives. F. Cicoira et al., Advanced Functional Materials, Vol 17, Issue 17, 3421-3434 (2007)
- High-Efficiency Polymer LEDs with Fast Response Times Fabricated via Selection of Electron-Injecting Conjugated Polyelectrolyte Backbone Structure, M. Suh et al., ACS Appl. Mater. Interfaces, (2015), DOI: 10.1021/acsami.5b07862.