Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 4, Issue 11, Pages 6104-6108Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am301732m
Keywords
polymer light-emitting device; solution process; electron injection; lithium quinolate; ZnO nanoparticles; inorganic-organic hybrid
Funding
- Strategic Promotion of Innovative RD Program
- Japan Regional Innovation Strategy Program by Excellence of Japan Science and Technology Agency (JST)
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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 Cs2CO3 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 (similar to 10 nm), and it did not require a high-temperature annealing process.
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