title: Thermal stability and structural characterization of organic/inorganic hybrid nonlinear optical material containing a two-dimensional chromophore.
abstract: In this study, two nonlinear optic hybrid materials with different dimensional alkoxysilane dyes were prepared and characterized. One NLO silane (Cz2PhSO 2OH- TES), a two-dimensional structure based on carbazole, had a larger rotational volume than the other (DR19-TES). Second harmonic ( d 33) analysis verified there is an optimum heating process for the best poling efficiency. The maximum d 33 value of NLO hybrid film containing Cz2PhSO 2OH was obtained for 10.7 pm/V after precuring at 150 degrees C for 3 h and poling at 210 degrees C for 60 min. The solid-state (29)Si NMR spectrum shows that the main factor influencing poling efficiency and thermal stability was cross-linking degree of NLO silane, but not that of TMOS. In particular, the two-dimensional sol-gel system has a greater dynamic and temporary stability than the one-dimensional system due to Cz2PhSO 2OH-TES requiring a larger volume to rotate in the hybrid matrix after cross-linking.
authors.affiliation: Department of Chemical Engineering, National Tsing Hua University, Hsinchu, 300 Taiwan, ROC.
authors.forename: Po-Hsun
authors.initials: PH
authors.lastname: Chang
authors.forename: Hsieh-Chih
authors.initials: HC
authors.lastname: Tsai
authors.forename: Yu-Ren
authors.initials: YR
authors.lastname: Chen
authors.forename: Jian-Yu
authors.initials: JY
authors.lastname: Chen
authors.forename: Ging-Ho
authors.initials: GH
authors.lastname: Hsiue