The dependence of the 8-hydroxyquinoline (8-Hq) vapour pressure on temperature, log P8-Hq [Torr] = 8.4249 − 2963.5/T, (386–482 K) was measured by Bourdon manometer technique. Tris(8-hydroxyquinoline) aluminum crystals were grown under controlled P8-Hq [0.1–11.3 Torr] and their cell parameters were measured.
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.
The regularities of polymorphism in high purity crystalline tris(8 hydroxyquinoline) aluminum, gallium, and indium (Meq 3 ) have been studied in the temperature range of 300-712 K. From the results of an analysis of photoluminescence and Raman spectra and X ray diffraction data, a generalized picture has been produced, according to which, for all the studied compounds, a series of polymorphic transitions is the same: β → α → δ → γ → ε. Based on high purity single phase specimens of the investigated metal complexes and boron oxide, new hybrid materials have been synthesized: bulk samples (alloying technique) and thin films (vacuum thermal evaporation). The photo and electroluminescent properties of the hybrid materials at room temperature have been investigated. It has been established that, as the synthesis duration of the bulk hybrid mate rials increases from 5 to 60 min, a photoluminescence maximum shifts to a short wavelength domain from the value typical of pure δ(γ) Meq 3 by 40, 15, and 10 nm for Alq 3 , Gaq 3 , and Inq 3 , respectively.
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