Photochromic diarylethene derivatives containing 2,4-diphenylphenyl substituents formed stable amorphous solids and showed reversible solid-state photochromism. Refractive indices of the amorphous films changed reversibly with the photochromic reactions as much as Δ n = 0.028 at 817 nm. Changes in both absorption band and static polarizability contributed to the large refractive index modulation.
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Kim et al. (2003) studied this question.
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