Prospective Electroluminescent Hybrid Materials

Tris(8-hydroxyquinoline)boron (Bq3) was synthesized by means of a high-temperature substitution reaction. Mixtures of different Bq3 polymorphs were obtained and their spectral and structural properties were investigated. A comparison of organic light-emitting diode (OLED) structures with Bq3 and Alq3 as emitting materials showed the prospective application of Bq3 as a blue-light emitter. Thin-film hybrid materials (HM) were made by vacuum thermal deposition. HM films were produced by layer-by-layer thermal vacuum sputtering of B2O3/Alq3/B2O3/MoO3/Al on a glass substrate with an indium tin oxide (ITO) conducting layer. The HM films were locally heated by a diode laser (785 nm). The pumping of 150 W cm–2 energy for one second resulted in an irreversible change in the HM film. Chromaticity coordinates for the as-prepared and laser-induced HM films showed a significant difference in their photoluminescent properties.