Photochemical formation of electroluminescent systems

The process of photochemical generation of images emitting electroluminesce nce was developed. This process involves the photosensitive composition tha t consists of poly(epoxypropylcarbazole) containing donor carbazolyl groups and CBr4 as an acceptor. This composition generates an acid under exposure to light. 8-Hydroxyquinoline is also incorporated into the layer, which pr ovides dissolution of the aluminum film in the presence of a photoacid yiel ding organometallic compounds, in particular, tris(8-hydroxyquinoline)alumi num. The electroluminescence spectrum of the exposed regions of the polymer layer is the superposition of the poly(epoxypropylcarbazole) spectrum and the spectrum of tris(8-hydroxyquinoline)aluminum molecules. It extends from 350 to 800 nm and has a maximum at 520 nm. The electroluminescence intensi ty increases with increasing the exposure dose. Electroluminescence is abse nt in the unexposed regions of the layer. It does not appear in the exposed regions if 8-hydroxyquinoline is absent in the polymer layer.