Improved electron injection in polymer light-emitting diodes using anionic conjugated polyelectrolyte
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- Improved electron injection in polymer light-emitting diodes using anionic conjugated polyelectrolyte
- Jin, Youngeup; Bazan, Guillermo C.; Heeger, Alan J.; Kim, Jin Young; Lee, Kwanghee
- LIF/AL CATHODE; DEVICES; PERFORMANCE; EMISSION; BILAYER
- Issue Date
- AMER INST PHYSICS
- APPLIED PHYSICS LETTERS, v.93, no.12, pp.1 - 3
- We report improved performance in polymer light-emitting diodes incorporating conjugated polyelectrolytes as an electron injection layer (EIL). When we introduce water soluble conjugated polymers, poly[9,9'-bis(4-sulfonatobutyl)fluorene-co-alt-1,4-phenylene] (anionic PFP), between the aluminum (Al) cathode and emissive layer, the devices show an increased electroluminescence efficiency with a lowered turn-on voltage. We believe the mobile Na(+) ions in the EIL layer directly influences the device efficiency by forming a low work function layer at the interface between the EIL and Al cathode, thereby facilitating the electron injection into the emissive layer.
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