Abstract
The performance of polymer light emitting devices (PLEDs) based on polyvinyl carbazole (PVK) is improved by introducing a nanoscale interfacial thin layer, made of poly(ethylene oxide) (PEO), between the calcium cathode and the PVK emissive layer. It is believed that the PEO layer plays a key role in enhancing the device performance. In comparison to the device with Ca/Al as the cathode, the performance of the PLED with PEO/Ca/Al cathode, including the driving voltage, luminance efficiency is significantly improved. These improvements are attributed to the introduction of a thin layer of PEO that can lower the interfacial barrier and facilitate electron injection.
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Rao, M.V.M., Huang, TS., Su, YK. et al. Polymer light-emitting devices using poly(ethylene oxide) as an electron injecting layer. Nano-Micro Lett. 2, 49–52 (2010). https://doi.org/10.1007/BF03353617
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DOI: https://doi.org/10.1007/BF03353617