ИСТИНА

Symmetrical Pt complexes with different 8-oxyquinolinol derivatives, namely, unsubstituted 8-oxyquinolinol and 2-methyl-8-oxyquinolinol, have been synthesized and purified to better than 99.998 wt%. Using a developed technique based on simultaneous measurements of photoluminescence and reflection spectra of a condense phase under controlled ligand partial pressure and temperature the corresponding P(ligand)-T diagrams have been plotted in the temperature range from 350 K to the maximum melting temperatures. Depending on synthesis conditions crystalline preparations with different concentrations of point defects (nonstoichiometry) have been prepared within the homogeneity ranges. The influence of nonstoichiometry on photoluminescence, cell parameters, and chemical activities of the complexes was studied. OLED structures, prepared on the base of the same complexes as emitting materials, demonstrated significant variation of EL parameters (intensity in several times, energy efficiency within 40 rel%) with nonstoichiometry. The research was supported by the Russian Science Foundation by grant 14-13-01074?.