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Product Code M0231A4-250mg
Price £330 ex. VAT

F8BT (PFBT), popular green emitting polymer

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

Overview | Specifications | MSDS | Pricing and Options  | Literature and Reviews

F8BT (PFBT), CAS number 210347-52-7, 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/Aluminum 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
M0231A4 Chloroform, chlorobenzene Chlorobenzene
M0231A5 Toluene, chloroform, chlorobenzene Toluene
M0231A6 Toluene, chloroform, chlorobenzene Toluene
M0231A7 Toluene, chloroform, chlorobenzene Toluene
M0231A8 Toluene, chloroform, chlorobenzene Toluene

Batch details

Batch number MW Mn PDI Stock info
M0231A4* 503,486 187,303 2.69 low 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
M0231A8 298,964 78,719 3.80 In stock

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


Batch 250 mg 500 mg 1 g
M0231A4/A8 £330 £560 £950
M0231A7 £210 £340 £600

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)
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