Langmuir-Blodgett devices insulator

Jung, G.Y., et al. 2000. The effect of insulating spacer layers on the electrical properties of polymeric Langmuir-Blodgett film light emitting devices. / Phys D Appl Phys 33 1029-1035. 

We report on the use of insulating Langmuir-Blodgett films of arachidic acid (AA) to improve the quantum efficiency of light emitting devices based on evaporated molecular films of 8-hydroxyquinoline aluminium (Alq) and N,N -diphenyl-N,N -(3-methylphenyl)-l,l -biphenyl-4,4 -diamine (TPD). Devices based on indium-tin oxide (ITO)/TPD/Alq/Al structures were found to emit green visible electroluminescence (peak at 517 nm) when a positive bias was applied to the ITO electrode. The external quantum efficiency was approximately 0.13 %. The incorporation of an arachidic acid LB film between the Alq and the A1 electrode was found to increase both the forward current and light output of the LED and to produce a threefold increase in efficiency - to 0.4 %. 

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