> aqueous suspensions of PMMA nanoparticles doped with P-type diarylethene photochromes: DAE-0001 (blue), DAE-0012 (magenta), and DAE-C4 (yellow), sourced from Yamada Chemical Co. DAE-0001 and DAE-0012 were selected in alignment with the three-channel photochromic system employed in prior multicolor rewritable photochromic display while DAE-C4 was chosen as an alternative yellow primary because it more closely matches the other two dyes in absorptivity at the photostationary state and decolorizes far more slowly in ambient light than the previously used yellow compound DAE-0068, which faded ∼4× faster in ambient light than the blue and magenta channels in previous work. In this work, all three dyes can be activated by widely available 365-nm UV-LED sources and retain their colored state for hours to days under typical indoor lighting.
“Programmable pigments: Multicolor photochromic nanoparticle inks for rewritable intradermal smart tattoos”, Matter & Light (2026):
https://doi.org/10.1016/j.matlit.2026.100119
> aqueous suspensions of PMMA nanoparticles doped with P-type diarylethene photochromes: DAE-0001 (blue), DAE-0012 (magenta), and DAE-C4 (yellow), sourced from Yamada Chemical Co. DAE-0001 and DAE-0012 were selected in alignment with the three-channel photochromic system employed in prior multicolor rewritable photochromic display while DAE-C4 was chosen as an alternative yellow primary because it more closely matches the other two dyes in absorptivity at the photostationary state and decolorizes far more slowly in ambient light than the previously used yellow compound DAE-0068, which faded ∼4× faster in ambient light than the blue and magenta channels in previous work. In this work, all three dyes can be activated by widely available 365-nm UV-LED sources and retain their colored state for hours to days under typical indoor lighting.