Photochemical production of electroluminescent image

A polymer containing donor N-epoxypropylcarbazolyl groups and the acceptor tris(8-qninolinolato)aluminum (Alq(3)) was shown to form a light-sensitive, acid-producing polymeric composition, The acid in the presence of 8-quinol inol (8-hydroxyquinoline) ensured photochemical dissolution of aluminum in the polymeric layer, yielding additionally organic aluminum complexes, such as Alq(3), Alq(2+), and Alq(2+), and Alq(3)-containing polymers. This led to a emergence of electroluminescence (EL) upon application of a potential difference to a sandwich diode representing transparent anode/exposed polym er layer/aluminum cathode. Electroluminescence did not appear at an Alq(3) concentration of 6 wt % and less in the composition, and only partial disso lution of the aluminum film after its deposition on the exposed polymeric l ayer provided the emergence of EL whose intensity increased with increasing the dose absorbed by the polymer. The addition of the chemical sensitizer dimethylaminobenzaldehyde to the composition triggered the conventional pro cess of chemical amplification which consists in thermal buildup of the aci d in exposed area. This provided a significant increase in concentration of organoaluminum complexes and enhancement of EL intensity.