Solution-Processed Inorganic–Organic
Hybrid Electron Injection
Layer for Polymer Light-Emitting Devices
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Abstract
A lithium quinolate complex (Liq) has high solubility
in polar
solvents such as alcohols and can be spin-coated onto emitting polymers,
resulting in a smooth surface morphology. A polymer light-emitting
device fabricated with spin-coated Liq as an electron injection layer
(EIL) exhibited a lower turn-on voltage and a higher efficiency than
a device with spin-coated Cs<sub>2</sub>CO<sub>3</sub> and a device
with thermally evaporated Ca. The mixture of ZnO nanoparticles and
Liq served as an efficient EIL, resulting in a lower driving voltage
even in thick films (∼10 nm), and it did not require a high-temperature
annealing process