Effective Generation Of Triplet States And Singlet Oxygen By Sulfur-Containing Squaraines: Experimental And Theoretical Study

Efficiency of singlet oxygen generation is investigated for a series of new sulfurcontaining squaraines molecules. Experimental results, in agreement with quantum calculations, show both large triplet quantum yield and quantum yield of singlet oxygen generation. © 2010 Optical Society of America

Two-Photon Absorption In Single Crystals Of Cyanine-Like Dye

We report the two-photon absorption spectrum of single crystals of an asymmetric cyanine-like dye in comparison to its spectrum in solution. The 2PA peak magnitude is comparable to bulk semiconductors of similar absorption edge. © 2010 Optical Society of America

Effective Generation Of Triplet States And Singlet Oxygen By Sulfur-Containing Squaraines: Experimental And Theoretical Study

Efficiency of singlet oxygen generation is investigated for a series of new sulfurcontaining squaraines molecules. Experimental results, in agreement with quantum calculations, show both large triplet quantum yield and quantum yield of singlet oxygen generation. ©2010 Optical Society of America

Two-Photon Absorption In Single Crystals Of Cyanine-Like Dye

We report the two-photon absorption spectrum of single crystals of an asymmetric cyanine-like dye in comparison to its spectrum in solution. The 2PA peak magnitude is comparable to bulk semiconductors of similar absorption edge. © 2010 Optical Society of America

Two-Photon Absorption Spectrum Of A Single Crystal Cyanine-Like Dye

Novel vertical alignment (VA) mode is presented for fast response and wide viewing angle in the LCD panel. The key concept of the new mode is that the pre-tilt for fast response and multi-domain is generated in the surface of alignment layer composed of vertical alignment part and photo-reactive moiety. The UV treatment of the new alignment layer under applied voltage provides fast control of liquid crystal texture and wide viewing angle in liquid crystal display. Because of the uniform distribution of the reactive monomer (RM) and inherent prevention of the RM migration in the LC cell, the enhanced picture quality and reliability in the LCD TV panel are achieved. © 2012 IEEE

Solitonic Waves In Polyene Dications And Principles Of Charge Carrier Localization In Π-Conjugated Organic Materials

The quantum-chemical investigations by ab initio method (restricted Hartree-Fock/6-31G) have been performed for a series of unsubstituted, monosubstituted, and disubstituted neutral polyenes and their double charged cations. The waves of charge alternation (characterized by the difference in the electron densities at the nearest carbon atoms or δq function) and bond length alternation (characterized by the lengths difference of the nearest carbon-carbon bonds or δl function) are reported. Comparisons are made with the corresponding monocationic polymethine molecules. We found that ionization by two electrons results in formation of two solitonic waves of charge alternation, rather than superposition of two overlapping solitonic waves into one. These waves behave similar to two independent elastic particles, which do not penetrate into each other despite the special confinement by the length of chromophore π-system. In monosubstituted polyene dication, δq and δl functions contain two waves each; however, only one wave is mobile and sensitive to a change of the chemical nature of the terminal group, whereas the second wave remains practically unchanged. The introduction of one oxymethyl or phenyl terminal groups leads to a relatively small shift of the mobile wave from the center to a direction of the terminal group. The effect of the amino or tropilium terminal groups is much more pronounced and leads to a shift of the mobile wave to the end of the molecule. In disubstituted polyene dication, both solitonic waves become mobile and shift symmetrically to both ends. The general principles of the charge localization described in this study may be used in molecular design and fine-tuning of the charge transport properties in plastic photovoltaics and other organic semiconducting materials. Copyright © 2012 Wiley Periodicals, Inc