Thin film electroluminescence element

Abstract

A thin film EL element capable of emitting light of different colors desired even at a low applied voltage owing to its high luminescent efficiency and freedom from crystal defects. The thin film EL element is of the dual dielectric structure having a transparent substrate (1), and a transparent conducting film (2), a first dielectric layer (3), a luminescent layer (4), and a second dielectric layer (5), which are formed on top of the other on the substrate, the transparent conducting film and the second dielectric layer being provided with respective electrodes (6a, 6b). It is characterized in that the luminescent layer has a superlattice structure represented by (luminscent host material)/(luminescent host material):(luminescent center impurity). The luminescent layer permits the doping of various luminscent center impurities while keeping its electrical neutrality without a need for the addition of charge compensating elements.

Dependencies are inferred from the claim text.