Photoinduced bleaching and temporal stability of organic nonlinear optical materials in Langmuir-Blodgett films

Shihong Ma; Huiqing Jia; Xingze Lu; Wencheng Wang

doi:10.1117/12.318266

14 August 1998 Photoinduced bleaching and temporal stability of organic nonlinear optical materials in Langmuir-Blodgett films

Shihong Ma, Huiqing Jia, Xingze Lu, Wencheng Wang

Author Affiliations +

Proceedings Volume 3556, Electro-Optic and Second Harmonic Generation Materials, Devices, and Applications II; (1998) https://doi.org/10.1117/12.318266
Event: Photonics China '98, 1998, Beijing, China

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.

Citation Download Citation

Shihong Ma, Huiqing Jia, Xingze Lu, and Wencheng Wang "Photoinduced bleaching and temporal stability of organic nonlinear optical materials in Langmuir-Blodgett films", Proc. SPIE 3556, Electro-Optic and Second Harmonic Generation Materials, Devices, and Applications II, (14 August 1998); https://doi.org/10.1117/12.318266

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