Versatile Synthesis of Small NLO-Active Molecules Forming Amorphous Materials with Spontaneous Second-Order NLO Response
摘要:
A novel synthetic approach to a series of bulky triarylamines substituted by various electron-withdrawing groups and forming amorphous materials is presented. Under vacuum evaporation, thin films with high optical quality are obtained and exhibit spontaneous second-order nonlinear optical activity. This unprecedented result is likely due to subtle balance between strong dipole-dipole interactions and steric crowding causing self-assembly and noncentrosymmetric local ordering, stable up to one year.
Versatile Synthesis of Small NLO-Active Molecules Forming Amorphous Materials with Spontaneous Second-Order NLO Response
摘要:
A novel synthetic approach to a series of bulky triarylamines substituted by various electron-withdrawing groups and forming amorphous materials is presented. Under vacuum evaporation, thin films with high optical quality are obtained and exhibit spontaneous second-order nonlinear optical activity. This unprecedented result is likely due to subtle balance between strong dipole-dipole interactions and steric crowding causing self-assembly and noncentrosymmetric local ordering, stable up to one year.
This study reports the syntheses, photophysical and electrochemical properties and memory characteristics of triphenylamine (TPA) donor based molecules with progressively weaker terminal acceptor strength (i.e., nitro, acetyl and bromine). The influence of the terminal electron acceptor strength on the film morphology and the devices storage performances was investigated. Nonvolatile ternary (“0”, “1” and “2” states) memory devices for high-density data storage could be achieved with a simple ITO/D–A molecule/Al sandwich configuration for TPA-NAP and TPA-AAP. It is noteworthy that the memory device based on TPA-AAP exhibited a better reproducibility and stability with lower operation voltages than that based on TPA-NAP, promising low-power consumption data-storage. These obtained results demonstrate that altering the terminal electron accepting strength in D–A molecules can adjust the film morphology and the device performances for the design of future advanced organic electronic devices.
[EN] CHIRAL POLYMER COMPOSITIONS EXHIBITING NONLINEAR OPTICAL PROPERTIES<br/>[FR] COMPOSITIONS POLYMERES CHIRALES PRESENTANT DES PROPRIETES OPTIQUES NON LINEAIRES
申请人:MOLECULAR OPTOELECTRONICS CORP
公开号:WO2000054103A1
公开(公告)日:2000-09-14
Chiral organic polymers doped with or appended by nonlinear optical dyes are disclosed. The use of chiral polymers produces a more stable noncentrosymmetric environment for the dye molecules resulting in unexpectedly long relaxation times as compared with previously used organic polymers. In addition, the NLO/chiral polymer materials exhibit high electro-optical coefficients (r33), high nonlinear optical coefficients (d33), improved long-term thermal stability, and at the same time retain the processing advantages associated with organic polymers. Thus, the present NLO/chiral polymer materials are extremely well-suited for use in second-order nonlinear optical and optoelectronics devices.
Versatile Synthesis of Small NLO-Active Molecules Forming Amorphous Materials with Spontaneous Second-Order NLO Response
作者:Eléna Ishow、Cyril Bellaïche、Laurent Bouteiller、Keitaro Nakatani、Jacques A. Delaire
DOI:10.1021/ja038207q
日期:2003.12.1
A novel synthetic approach to a series of bulky triarylamines substituted by various electron-withdrawing groups and forming amorphous materials is presented. Under vacuum evaporation, thin films with high optical quality are obtained and exhibit spontaneous second-order nonlinear optical activity. This unprecedented result is likely due to subtle balance between strong dipole-dipole interactions and steric crowding causing self-assembly and noncentrosymmetric local ordering, stable up to one year.