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Questions And Answer

• Classification

  Polyfluorenes, Benzothiodiazoles, Organic semiconducting materials, Semiconducting polymers, OLED green emitter materials, OLED materials, Organic Photovoltaic materials, Polymer solar cells, OFET materials. ;

• Applications

  A widely used green emitting reference polymer for a variety of applications including as an emissive species in OLEDs, an approximately balanced p-type and n-type polymer for OFETs and light emitting transistors as well as being used a polymeric accepter for OPVs. 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.
  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 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. ;

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