Journal
APPLIED PHYSICS LETTERS
Volume 98, Issue 10, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3560484
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- EPSRC [EP/F061609/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F061609/1] Funding Source: researchfish
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Here we demonstrate high efficiency, flexible inverted polymer light-emitting diodes in which the bottom-contact cesium carbonate electron injection layer is gravure contact printed. The poly (9,9-dioctylfluorene-alt-benzothiadiazole) emissive/electron transport layer, the poly (9,9-dioctylfluorene-alt-N-(4-butylphenyl)-diphenylamine) hole transport/electron blocking layer and the poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) hole injection layer were sequentially spin-coated from solution using orthogonal solvent formulations with appropriate wetting properties. By switching from indium-tin-oxide (ITO) on glass to ITO on poly(ethylene terephthalate) and using gravure contact printing instead of spin-coating, Cs2CO3 smoothness and morphology was optimized, resulting in an approximately fivefold increase in current efficiency and power efficiency at 100 cd/m(2). (C) 2011 American Institute of Physics. [doi:10.1063/1.3560484]
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