We present the optical properties (such as refractive index, extinction coefficient) of four layer structures, which differ only in the azo dyes layer. We used the family of azo compounds, where electron-donating and electron withdrawing groups (OCH3, CH3, Br) were introduced to the benzene ring. Then, these azo dyes were mixed with poly(3- octylthiophene) (P3OT). Afterwards, the layered structure (i.e. glass/ITO/PEDOT:PSS/azo dye+P3OT) was produced. We found that by changing the substituent in the azo compound we change the photo-physical properties of multilayer structure. Thus, we can prepare layered structures that can have potential applications in optoelectronics as photovoltaic cells or organic light-emitting diodes.
In this study, the 2-(4-methacryloxystyryl)quinoline, 2-(4-methacryloxystyryl)-6-methoxyquinoline were synthesized. The polymers built from the free radical polymerization of methacrylic monomers incorporating the diarylethylenes sidegroup have been synthesized in dimethylformamide with azobisisobutyronitrile as initiator. The products of polymerization were characterized and evaluated by 1HNMR, UV spectroscopy. Thermal stability was characterized by DSC method. Their optical and photochemical properties as well as temperature dependence of the photoluminescence of diarylethylenes have been investigated.
In this paper we report the synthesis of side chain methacrylic polymers functionalized with styrylquinoline fragments. The polymerization was carried out in dimethylformamide with azobisisobutyronitrile as initiator. The products of polymerization were characterized by 1H NMR, DSC. A study on the energetics of modelling compounds has been performed by a synergetic use of both electrochemical and optical techniques. The results of photochemical activities of the corresponding polymers are presented.
Polymers containing azobenzene dyes or azobenzene lateral groups are of special interest for their application as optically active media, particularly, as polarization sensitive media for such applications: optical data storage, surface nanostructuration, photoswitching, alignment of liquid crystals, active optical elements etc. An intensive research was carried out previous years on synthesizis and investigation of the second order nonlinear optical response of azobenzene/polymer systems. The desirable properties of these materials are attributed to the highly efficient photoinduced trans-cis and vice versa isomerization of azobenzene moieties. This transformation is connected with the volume change of molecules, followed by an increase of their rotational mobility. The trans-cis izomerization process is exploited also in all optical poling of polymers and plays an important role in optical depoling. Generally these phenomena are induced by light with frequencies corresponding to one-photon absorption. They are possible also by multiphoton absorptions. In this paper we report the synthesis of side chain methacrylic polymers functionalized with azobenzene chromophores. A reversible change of thin film absorption is observed when illuminating it with monochromatic, linearly polarized light under the applied external DC field. The amount of change depends on the angle between the light polarization and the DC electric field direction.
Third order nonlinear optical properties (NLO) of thin films of pure DNA-CTMA complex and of those doped with
disperse red 1 (DNA-CTMA-DR1) and copper phthalocyanine (DNA-CTMA-CoPc) chromophores were studied by the
optical third harmonic generation and as function of the dopant concentration. The THG measurements, performed in
vacuum at 1064 nm fundamental wavelength reveal an one orders of magnitude increase of &khgr;(3)(-3&comega;;&comega;,&comega;,&comega;) susceptibility of the DNA-CTMA complex when doped with 5% of DR1. This increase is less important for the complex
doped with CoPc. For both dopants it doesn't follow the chromophore concentration, as it could be expected. This
behavior is interpreted in terms of the influence of local field. The &khgr;(3)(-3&comega;;&comega;,&comega;,&comega;) susceptibility of pure DNA-CTMA
complex is about one order of magnitude larger than for silica plate, used as standard.
Conference Committee Involvement (11)
Nanobiosystems: Processing, Characterization, and Applications X
9 August 2017 | San Diego, California, United States
Nanobiosystems: Processing, Characterization, and Applications IX
28 August 2016 | San Diego, California, United States
Nanobiosystems: Processing, Characterization, and Applications VIII
10 August 2015 | San Diego, California, United States
Nanobiosystems: Processing, Characterization, and Applications VII
18 August 2014 | San Diego, California, United States
Nanobiosystems: Processing, Characterization, and Applications VI
25 August 2013 | San Diego, California, United States
Nanobiosystems: Processing, Characterization, and Applications V
12 August 2012 | San Diego, California, United States
Nanobiosystems: Processing, Characterization, and Applications IV
21 August 2011 | San Diego, California, United States
Nanobiosystems: Processing, Characterization, and Applications III
4 August 2010 | San Diego, California, United States
Nanobiosystems: Processing, Characterization, and Applications II
5 August 2009 | San Diego, California, United States
Nanobiosystems: Processing, Characterization, and Applications
12 August 2008 | San Diego, California, United States
Nanobiotronics
26 August 2007 | San Diego, California, United States
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