Novel characteristics of electroluminescent diode with organic superlattice structure utilizing 8-hydroxquinoline aluminume and aromatic diamine

Summary form only given, as follows. Novel optical characteristics of superlattice structure diode which consist of alternate layers of fluorescent molecules 8-hydroxquinoline aluminum (Alq₃) and aromatic diamine (TPD) have been presented. Photoluminescence intensity from Alq3 has been enhanced in the superlattice structure and the intensity has been modulated under reverse biased condition as shown in Fig. 1. The dependence on electric field is stronger in the thinner layer of superlattice, which is explained by the interaction among photoexcited excitons, the reverse biased field and the carrier confinement. Exciton dynamics and the quantum size effect has been discussed in the superlattice structure. The electroluminescent (EL) diode consists of superlattice structure shows spectral narrowing and the emission energy shift compared with the conventional heterostructure diode. Carrier and exciton confinements have been discussed in the EL diode with superlattice structure considering the energy band scheme.