A 320‐dpi 4‐in. reflective stacked crossed guest‐host display

Hasegawa, Masaki; Takeda, Kanji; Sakaguchi, Y.; Taira, Yoichi; Egelhaaf, J.; Lüeder, E.; Lowe, A. C.

doi:10.1889/1.1985292

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2002

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“…Thin PI layers are widely known to work as orientational layers for liquid crystal (LC) alignment in LC devices. More surprisingly, LCs can be aligned by the exposure of a PI surface to polarized light. − The polarized light is believed to induce anisotropy in the PI backbones or side chains. However, the detailed mechanisms have not yet been clarified because of difficulties in detecting intrinsic changes at the PI surface.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast Charge Separation and Recombination Dynamics in a Nanometer Thin Film of Polyimide Observed by Femtosecond Transient Absorption Spectroscopy

2002

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Femtosecond transient absorption spectroscopy was used to study how polyimide (PI) interacts with light in a nanometer-thick PI thin film. The PI containing pyromellitic diimide (PMDI) shows absorption by PMDI anions around 710 nm. Its decay occurs on two time scales: one is on the order of 10 ps and the other is on the order of a nanosecond. Each decay time is independent of the excitation wavelength and energy density, indicating that a geminate recombination would be dominant in a PI film. Under excitation by 390 nm light, the faster decay process shows one-photon absorption, but the slower decay process shows a two photon-absorption process.

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