Strongly Directed Emission from Controlled-Spontaneous-Emission Electroluminescent Diodes with Europium Complex as an Emitter

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Abstract
Multilayer electroluminescent diodes with sharp red emission were fabricated using a new europium complex as an emitter. Microcavity structures were introduced into the EL diodes with sharp red emission. The device structure consisted of a dielectric reflector composed of SiO2/TiO2 bilayers, an indium-tin-oxide electrode, a hole transport layer, a europium complex as an emission layer, an electron transport layer and a MgAg electrode. The dielectric reflector and the MgAg metal electrode constituted a planer microcavity, and sharply directed emission from the europium complex was observed when operated under dc drive voltage. The relationship between emission angle and the size of the microcavity was discussed.