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