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Product Code M0231A4-250mg
Price $375.00 ex. VAT

F8BT (PFBT), popular green emitting polymer

High purity (>99.9%) and available for priority dispatch

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) makes it air stable while the liquid-crystalline and beta phases make it widely used for basic research purposes.

General Information

Full name Poly(9,9-dioctylfluorene-alt-benzothiadiazole)
Synonyms F8BT, PFBT
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%
Appearance Orange powder/flakes

Chemical Structure

f8bt, 210347-52-7 chemical structure
Chemical structure of F8BT, CAS 210347-52-7

Device Structure(s)

Device structure ITO/PEDOT:PSS/TFB/F8BT/F8imBT-Br*/Ca/Al [4]
Colour green light emitting device 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 glove box 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:

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.

Polyfluorene-based OLED architecture based on F8 blended with F8BT
Typical Ossila device architecture: Polyfluorene-based OLED architecture based on F8 blended with F8BT.

Technical Data

Product Code Soluble solvents Recommended Processing Solvents at 10mg/ml
M0231A2 Toluene, chloroform, chlorobenzene Toluene
M0231A3 Toluene, chloroform, chlorobenzene Toluene
M0231A4 Chloroform, chlorobenzene Chlorobenzene
M0231A5 Toluene, chloroform, chlorobenzene Toluene
M0231A6 Toluene, chloroform, chlorobenzene Toluene
M0231A7 Toluene, chloroform, chlorobenzene Toluene

Batch details

Batch number MW Mn PDI Stock info
M231 237,460 87,620 2.77 Discontinued
M232 381,510 225,746 1.69 Discontinued
M0231A1 173,203 72,168 2.40 Discontinued
M0231A2 46,952 14,429 3.25 Discontinued
M0231A3 28,861 15,095 1.91 Discontinued
M0231A4* 503,486 187,303 2.69 In stock
M0231A5 167,248 65,077 2.57 Discontinued
M0231A6 201,357 69,906 2.88 Discontinued
M0231A7 62,768 29,903 2.10 In stock

*Recommended processing solvent for M0231A4 is chlorobenzene for its high molecular weights.


Batch 250 mg 500 mg 1 g
M0231A4 £300 £500 £850
M0231A7 £190 £310 £540

MSDS Documentation


Literature and References

Please note that Ossila has no formal connection to any other authors or institutions in these references.

  1. Conjugated-Polymer Blends for Optoelectronics. C.R. McNeill et al., Advanced Materials, Vol 21, Issue 38-39, 3840 (2009)
  2. Electron and hole transport in poly(fluorene-benzothiadiazole). Y. Zhang et al., Appl. phys. Lett., Vol 98, 143504 (2011)
  3. Organic Light Emitting Field Effect Transistors: Advances and Perspectives. F. Cicoira et al., Advanced Functional Materials, Vol 17, Issue 17, 3421-3434 (2007)
  4. 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.

To the best of our knowledge the information provided here is accurate. However, Ossila assume no liability for the accuracy of this page. The values provided are typical at the time of manufacture and may vary over time and from batch to batch. All products are for laboratory and research and development use only, and may not be used for any other purpose including health care, pharmaceuticals, cosmetics, food or commercial applications.

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