Spray-on plasmonics enable tunable colours at video rate: Page 2 of 2

May 13, 2019 //By Julien Happich
A team of researchers from the University of Cambridge have devised a novel way to leverage plasmonics for stable colours that can be electrically tuned across different wavelengths, at speed.

By switching the charge state of the entire PANI shell and changing its redox state (sweeping a voltage from −0.2 to 0.6 V across the Au mirror as the working electrode), the authors were able to rapidly shift the resonant scattering colour of the eNPoM across wavelength ranges in excess of 100nm. They calculated that each active nanopixel only requires about 0.2 fJ of energy for each 1 nm shift in wavelength while achieving commercial video rates (over 50Hz), and these dynamics were proven to scale from the single nanoparticle level to multi-centimetre scale ultra-thin films.

The researchers had their prototypes pixel cells running for over three months at power densities below 300μW/cm2, or about 10 times lower than for commercial e-paper, they point in the paper. Meanwhile, because each nanoparticle acts as an individual pixel, theoretical pixel densities reach in excess of 109 pixels per inch, they argue, although differentiating addressable areas would require larger cell constructs and circuitry. The researchers also expect their electrochromic plasmonic pixels to be compatible with flexible substrates for large-scale roll-to-roll manufacturing on polymer films.

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