Pyrene-cored blue-light emitting [4]helicenes: synthesis, crystal structures, and photophysical properties

The synthesis, crystal structures and photophysical properties of two types of pyrene-cored blue-light emitting [4]helicenes are reported, in which two naphthalene rings of condensed pyrenes were constructed resulting in helical architectures. The photophysical properties and electrochemical characteristics of these pyrene-cored [4]helicenes were fully investigated in both solutions and films, along with that of the pre-cyclization Q4 products, 4,9- and 4,10-(phenylethenyl)pyrenes

非対称Langmuir-Blodgett膜の分子配向制御及び二次非線形光学効果

第1章 緒言 第2章 成膜分子の合成と分子超分極率の評価および水面単分子膜における成膜性､分子配向性の評価 第3章 非対称Langmuir-Blodgett膜の作製および分子構造と二次非線形光学効果 第4章 分子混合による配向制御および高効率二次非線形光学効果発現 第5章 非対称Langmuir-Blodgett膜の導波路デバイス化 第6章 総括Made available in DSpace on 2012-07-03T23:56:47Z (GMT). No. of bitstreams: 1 era.pdf: 14093422 bytes, checksum: 5d9f3030e69d39088da9ff6d35ec8b68 (MD5) Previous issue date: 1992-11-1

Application of the Stark Effect to Evaluation of Asymmetric Orientation Structure in Second-Order nonlinear Optical Materials

Stark effect was applied to the evaluation of asymmetrical molecular orientation in second-order non1inear optical materials: an asymmetrical Langmuir-Blodgett (LB) film and a poled polymer film. In the case of the asymmetrical LB film, molecular orientation in three types of LB films, which were fabricated with hetero Y-type, Z-type and Y-type deposition, was determined from the analysis of the Stark effect spectra. Molecules in the hetero Y-type film was proved to align asymmetrically. However, molecular orientation in the Z-type film possessed very small asymmetry; the order parameter of the Z-the film was almost equal to that of the symmetric Y-type film. In the poled polymer film, we have succeeded in the in situ evaluation of molecular orientation behavior under poling field and relaxation behavior of the molecular orientation after the poling field was removed. Above Tg, polar molecules doped in a polymer film behaved as a noninteracting solution under the influence of poling field. The relaxation of the polar orientation in the absence of the poling field was observed even below Tg

Pyrene-cored blue-light emitting [4]helicenes: Synthesis, crystal structures, and photophysical properties

The synthesis, crystal structures and photophysical properties of two types of pyrene-cored blue-light emitting [4]helicenes (7 and 9) are reported. The chemical structures of all synthesized compounds were fully confirmed by 1H and 13C NMR spectra, mass spectroscopy as well as elemental analysis. Single-crystal X-ray analysis of these [4]helicenes revealed that there are two types of laterally naphthalene annulated helical architectures, which are clearly influenced by different R substituents. The photophysical properties of the [4]helicenes (7 and 9) were fully investigated in both solutions and films, along with the pre-cyclization products, 4,9- and 4,10-bis(phenylethenyl)pyrenes (6 and 8). Notable optical features were obtained in these compounds, which make them promising candidates for several important applications in modern electronic and optoelectronic devices, such as blue emitters in organic light-emitting devices (OLEDs), or as models for further exploring the development of a new generation of organic materials based on pyrene. © The Royal Society of Chemistry 2013

Second-Harmonic Generation in Poled Filims of Photo-Crosslinkable Polymer-Dye System

Photo-crosslinkable polymer and dyes containing cinnamoyl groups were available for poled polymer films with stable second-order optical nonlinearity. We prepared poled polymer films using a photo-croslinkable polymer polyvinylcinnamate (PVCN) and three AZO dyes: noncrosslinkable DR1, monocrosslinkable DR2, and bicrosslinkable AZO2. Dye doped PVCN polymer films were crosslinked by UV irradiation at 293K under poling field. In the crosslinked films, small and rapid decrease of second-order nonlinearity was observed in several minutes after poling field was removed. After the first small decrease, however, the crosslinked polymer films exhibited stable second-order optical nonlinearity compared with uncrosslinked films. Further, the stability of second-order optical nonlinearity depended on number of cinnamoyl groups of doped azo dye; the stability was enhanced with increasing number of cinllamoyl group

二次非線形光学材料の配向構造評価へのシュタルク効果の応用

Stark effect was applied to the evaluation of asymmetrical molecular orientation in second-order non1inear optical materials: an asymmetrical Langmuir-Blodgett (LB) film and a poled polymer film. In the case of the asymmetrical LB film, molecular orientation in three types of LB films, which were fabricated with hetero Y-type, Z-type and Y-type deposition, was determined from the analysis of the Stark effect spectra. Molecules in the hetero Y-type film was proved to align asymmetrically. However, molecular orientation in the Z-type film possessed very small asymmetry; the order parameter of the Z-the film was almost equal to that of the symmetric Y-type film. In the poled polymer film, we have succeeded in the in situ evaluation of molecular orientation behavior under poling field and relaxation behavior of the molecular orientation after the poling field was removed. Above Tg, polar molecules doped in a polymer film behaved as a noninteracting solution under the influence of poling field. The relaxation of the polar orientation in the absence of the poling field was observed even below Tg