Hybrid nanofilms with laser-control luminescence

Nanosize films of organic electroluminophors have offered the challenge to a new generation of light emitting devices - OLED. Tris-(8-oxyquinoline) aluminum (Alq₃) was one of the first compounds which demonstrated high efficient green electroluminescence and to the moment it is still used as emission and electron transport material in OLED. Alq₃ is known to exist in several polymorphs with photoluminescence (PL) maximum varied from 537 to 481 nm. One of main problem of OLED technology consists in a high cost of organic materials. An attempt to use organic-inorganic hybrid materials for a creation of a novel thin film emission device has not been very successful yet. But the investigation of hybrid material (HM) based on B₂O₃ glass matrix and Alq₃ as phosphor agent showed that there were observed a significant shift of luminescent peak to short waves after bulk HM annealing. The change in the luminescence spectrum can was explained by the polymorph and/or conformation transitions in Alq₃ in the crystal field of the matrix.