Near-infrared emission from tris(8-hydroxyquinoline) aluminum based microcavity light emitting diodes

摘要

Organic microcavity devices emitting in the near-infrared spectral region were fabricated. The devices consisted of two metal mirrors and two organic layers, N,N'-di(naphthalene-1-yl)-N,N'-diphenylbenzidine (NPB) as a hole transport layer and tris (8-hydroxyquinoline) (Alq) as emitting layer. Two different metals, copper and silver, were used as a bottom mirror, while silver was used as a top mirror. The devices were studied using reflectance, photoluminescence, and electroluminescence measurements. Angular dependence of the emission was also investigated. The origin and properties of this infrared emission are discussed. (C) 2004 Elsevier B.V. All rights reserved.