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Dye-sensitized solar cells (DSSCs) have been the leading low-cost and clean energy conversion devices; however, their conversion efficiency still falls short of the standard set by inorganic solar cells. One method to improve the efficiency of the cell is to reduce the recombination of the injected electrons with the oxidized species of the redox couples present in the electrolytes near the surface...
Highly efficient luminescent materials based on the europium complex Eu(tta) 3 (phen) (tta=2-thenoyltrifluoracetonato, Phen=1,10-phenantroline) incorporated into different polymer matrixes (polyvinyl butyral, polysulfone and polyurethane) have been prepared. The photoluminescent hybrid films were prepared by solution mixing/drop casting which has been revealed as a very convenient method to...
A new class of bisquinoline diamines prepared by Friedländer condensation reaction are reported showing stable amorphous state with high glass transition temperatures up to 150°C and high thermal stabilities >370°C. Additionally, they show excellent fluorescent properties in the blue, green and yellow region of visible light in both solution and solid states. They show narrow full-widths at half-maxima...
Two new poly(amidoamine) dendrimers from first generation modified with 1,8-naphthalimide units in the dendrimer periphery have been synthesized. Their functional characteristics have been investigated in organic solvents of different polarity. The effect of the chemical nature of the 1,8-naphthalimide C-4 substituent on the photophysical properties of new dendrimers is discussed. The compounds have...
A series of well-defined star-shaped poly(N-isopropylacrylamide) (ZnTHPP-PAM) with zinc-porphyrin as the core was synthesized by atom transfer radical polymerization (ATRP). Zinc(II)meso-tetra(p-bromopropionylphenyl)porphyrin (ZnTHPP-Br) was employed as the initiator, and CuBr/tris(2-dimeoeth-yl)amine(Me 6 TREN) was selected as the catalyst system. The structures of the target polymers were...
Colloidal solutions of SiO 2 –TiO 2 mixed oxides having different SiO 2 contents were synthesized by sol–gel technique and thin films were deposited over glass slides by using dip coating technique. The samples were characterized by XRD, SEM, AFM and methylene blue adsorption methods. The surface free energy of thin films was measured by sessile drop method by using diiodomethane,...
The pH-dependent photochromic behaviour of a curcumin analogue, 2,6-bis(2-hydroxybenzilidene)cyclohexanone (HBC) has been investigated. The identification of stable and unstable species from network reaction was done by combination of NMR, UV–vis and fluorescence spectroscopy. The structure of stable species was established by 13 C NMR, 1 H NMR and 2D NMR spectra: DQF-COSY, HSQC and...
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