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General Information

Product Details

Batch History

Chemical structure of F8BT. CAS No.: 210347-52-7. Chemical formula: (C₃₅H₄₂N₂S)_n.

Applications

A widely used green emitting reference polymer for a variety of applications including as an emissive species in OLEDs [1], an approximay 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 with F8BT with the below specifications. This ink can then be applied either in air or in a glovebox with little difference in performance provided 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 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 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 approximay 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.

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

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.