Evaluation of thermal stability of organic electro-optic device by using thermally stimulated current

R Ikemoto, D Taguchi, T Manaka… - … of Nanoscience and …, 2016 - ingentaconnect.com
R Ikemoto, D Taguchi, T Manaka, M Iwamoto, T Yamada, A Otomo
Journal of Nanoscience and Nanotechnology, 2016ingentaconnect.com
Thermally stimulated current (TSC) measurement was employed to study the thermal
stability of electro-optic (EO) polymers, ie, guest/host polymer DR1/PMMA and side-chain
polymer PMMA-co-DR1. Here the isothermal relaxation test showed that the relaxation time
τ (85° C) of side-chain polymer PMMA-co-DR1 is longer than that of guest/host polymer
DR1/PMMA. TSC peaks appeared symmetrically in proportion to the poling electric field E p,
indicating that DR1 molecules make a dominant contribution to dipolar depolarization …
Thermally stimulated current (TSC) measurement was employed to study the thermal stability of electro-optic (EO) polymers, i.e., guest/host polymer DR1/PMMA and side-chain polymer PMMA-co-DR1. Here the isothermal relaxation test showed that the relaxation time τ (85 °C) of side-chain polymer PMMA-co-DR1 is longer than that of guest/host polymer DR1/PMMA. TSC peaks appeared symmetrically in proportion to the poling electric field E p, indicating that DR1 molecules make a dominant contribution to dipolar depolarization. Thermal sampling (TS) method showed that the activation energy of the DR1/PMMA is around 1 eV, while that of the PMMA-co-DR1 is distributed > 1 eV. Results suggested that side-chain polymer is preferable to the guest/host polymer in the thermal stability. TSC measurement is helpful as a conventional method for studying the life time of EO polymers in terms of dipolar motion.
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