The effect of insulating spacer layers on the electrical properties of polymeric Langmuir-Blodgett film light emitting devices

Jung, G.Y.; Pearson, C.; Horsburgh, L.E.; Samuel, I.D.W.; Monkman, A.P.; Petty, M.C.

Abstract

We report on the use of insulating Langmuir-Blodgett (LB) films to improve the quantum efficiency of light emitting devices based on polymeric LB films. The insertion of arachidic acid layers between a poly-(2-methoxy,5-(2'ethylhexyloxy)-p -phenylenevinylene) (MEH-PPV) film and an aluminium cathode was found to decrease the turn-on voltage for electroluminescence and to double the quantum efficiency. In contrast, depositing the fatty acid layer between the polymer and the indium tin oxide anode produced little change in the device efficiency. Dual-layer structures using MEH-PPV as the light emissive layer and poly-(p -(3-hexyl pyridylene)) as an electron transport layer were also tested. Again, an increase in device efficiency could be obtained by placing arachidic acid LB layers immediately beneath the metallic cathode.

Citation

Jung, G., Pearson, C., Horsburgh, L., Samuel, I., Monkman, A., & Petty, M. (2000). The effect of insulating spacer layers on the electrical properties of polymeric Langmuir-Blodgett film light emitting devices. Journal of Physics D: Applied Physics, 33(9), 1029-1035. https://doi.org/10.1088/0022-3727/33/9/301

• Journal Article Type: Article
• Publication Date: 2000-05
• Journal: Journal of Physics D: Applied Physics
• Print ISSN: 0022-3727
• Electronic ISSN: 1361-6463
• Publisher: IOP Publishing
• Peer Reviewed: Peer Reviewed
• Volume: 33
• Issue: 9
• Pages: 1029-1035
• DOI: https://doi.org/10.1088/0022-3727/33/9/301
• Keywords: ELECTROLUMINESCENCE DEVICES; CONJUGATED POLYMERS; LIMITED CONDUCTION;QUANTUM EFFICIENCY; DIODES; SPECTROSCOPY; DEGRADATION; MICROSCOPY;ELECTRODES; INJECTION