Photo- and electroluminescence of mixed-ligand Eu(III) complexes

Spectral and luminescent properties of mixed-ligand Eu(III) complexes were studied in solutions and in polyvinylcarbazole (PVC) thin films. Trends in their variations were found depending on the complex structure and excitation mode. The electroluminescence was observed in ITO/PEDOT/Eu complex:PVC/CaMg/Al devices. Their current-voltage and voltage-brightness characteristics were investigated.     

Photo- and electroluminescence of Eu(III) and Tb(III) coordination compounds in thin polyvinylcarbazole films

Organic thin-film structures based on Eu(III), Tb(III), and polyvinylcarbazole coordination compounds are synthesized. Their photo- and electroluminescent properties and volt-ampere and volt-brightness characteristics are investigated.     

Study of structure and spectral characteristics of the binuclear zinc complex with (<Emphasis Type="Italic">E</Emphasis>)-2-({2-[3-(pyridin-2-yl)-1<Emphasis Type="Italic">H</Emphasis>-1,2,4-triazol-5-yl]phenylimino}methyl)phenol

A study of the structure and spectral properties of the compound (E)-2-({2-[3-(pyridin-2-yl)-1H-1,2,4-triazol-5-yl]phenylimino}methyl)phenol and its binuclear complex with zinc was carried out by the quantum-chemical calculations at a level of density functional theory. Within the framework of the time-dependent density functional theory were calculated electron spectra of both compounds, which gave good agreement with experiment, and was revealed the nature of the absorption bands in the visible and near UV region taking into account the solvent effect. Complete interpretation of the absorption bands in the infrared spectra of the complex and protonated ligand was given, and the frequency shift and changes in the intensities of IR bands of the ligand at the complex formation were analyzed.     

Modeling of the Process of Inkjet Printing of Low-Viscosity Liquids

Russian Physics Journal - An approach to inkjet printing of low-viscosity liquids is suggested consisting in suppression of undesirable weakly damped acoustic oscillations under the action of a...     

Promising Organic Active Media for Blue-Green Tunable Lasers

Russian Physics Journal - Results of investigation of spectral-luminescent and lasing characteristics of substituted 1,3-oxazoles and 1,3,4-oxadiazoles lasing in the blue-green spectral region are...     

Luminescent characteristics of tetraphenylporphyrin and its derivatives with lutetium

The spectral and luminescent characteristics of new tetraphenylporphyrin derivatives that contain the lutetium atom in their structure are studied in comparison with the most completely studied unsubstituted tetraphenylporphyrin and its complex with zinc. The luminescence quantum yields in liquid and frozen solutions are measured. The specific features of luminescent characteristics of these compounds and their possible applications are discussed.     

Special Features of Photo- and Electroluminescence of Zinc and Magnesium Complexes

Russian Physics Journal - The results of spectral and luminescent study of zinc and magnesium metal complexes are presented. It is shown that radiation in mixed ligand complexes has the charge...     

Photophysical properties of coumarins in relation to the nature of their third and seventh substituents

The spectral, luminescent, and lasing properties of four derivatives of 7-hydroxycoumarin: 7-hydroxy-3-(4-methylthiazolyl)-coumarin (CI), 3-(4-methylthiazolyl)-2-oxocoumarin-furan-2-carboxylate (CII), 3-(4-(benzo[1,3]dioxolyl)-thiazolyl)-2-oxocoumarin-furan-2-carboxylate (CIII), and 3-(4-(benzo[1,3]dioxolyl)-thiazolyl)-2-hydroxycoumarin (CIV), as well as of their protolytic forms, are studied experimentally and theoretically by the INDO/S method. The luminescence quantum yield of the CIII and CIV compounds, having bulky substituents at position 3, is shown to strongly depend on the polarity of a solvent. It is suggested that, in polar solvents, these substituents are displaced out of the plane of the skeleton of the electronically excited molecule. The quantum-chemical calculations of such structures confirmed their weak fluorescence ability due to intense intersystem crossing. The lasing ability of the protolytic forms of the compounds considered is studied. The reason for the absence of lasing for the neutral compounds is discussed.     

Experimental and quantum-chemical studies of the 3-pyridine-7-hydroxy-2-iminocoumarin and 3-(2-methylthiazole)-7-hydroxy-2-iminocoumarin molecules

The luminescence spectral properties of 3-pyridyl-7-hydroxy-2-iminocoumarin and 3-(2-methylthiazole)-7-hydroxy-2-iminocoumarin were studied in ethanol solutions at different values of pH and also in other solvents differing in polarity. In their ethanol solutions, the compounds can exist as neutral molecules, anions, cations, and zwitterions. The spectral properties and geometry were studied for all possible forms of these compounds by the INDO/S quantum-chemical method.     

Effect of Copper Phthalocyanin Nanostructures on the Photovoltaic Characteristics of a Polymer Solar Cell

Russian Physics Journal - The results of studying the influence of copper phthalocyanine (CuPc) nanostructures on the generation and transfer of charge carriers in the semiconductor polymer...