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Proceedings Paper

Photoinduced bleaching and temporal stability of organic nonlinear optical materials in Langmuir-Blodgett films
Author(s): Shihong Ma; Huiqing Jia; Xingze Lu; Wencheng Wang
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Paper Abstract

Three organic dyes, diazostilbenes (HPNA), phenylhydrazone (PD) and hemicyanine (DAEP), all have large hyperpolarizability (beta) but different double bonds in their conjugated (pi) -electron systems (N equals N in HPNA, C equals N in PD and C equals C in DAEP). We investigated stability of LB multilayers of the three dyes and found that the second harmonic generation (SHG) intensities from those samples reduced significantly within a few tens of days. On the other hand, the Raman intensities from the powder samples of three dyes due to the stretching modes of the double bonds and the UV absorption band from the LB multilayers of the three dyes corresponding to the original chromophores also decreased with increasing time of UV irradiation, confirming the breakdown (cleavage) of the double bonds (photo-induced bleaching) in all the three dyes. The SHG, UV-vis absorption and Raman experiments deduced the same sequence of stability: N equals N the worst and C equals C the best, suggesting that photo- induced bleaching effect, instead of deterioration of the film frameworks, could possibly be responsible for the instability of the optical nonlinear LB films through a second-harmonic resonant effect.

Paper Details

Date Published: 14 August 1998
PDF: 5 pages
Proc. SPIE 3556, Electro-Optic and Second Harmonic Generation Materials, Devices, and Applications II, (14 August 1998); doi: 10.1117/12.318266
Show Author Affiliations
Shihong Ma, Fudan Univ. (China)
Huiqing Jia, Fudan Univ. (China)
Xingze Lu, Fudan Univ. (China)
Wencheng Wang, Fudan Univ. (China)

Published in SPIE Proceedings Vol. 3556:
Electro-Optic and Second Harmonic Generation Materials, Devices, and Applications II
Chuangtian Chen, Editor(s)

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