Electronic paper in color by electrochromic materials and plasmonics
Doktorsavhandling, 2023
By using structural colors (metal-insulator-metal) and plasmonics, we could create highly reflective color pixels. The pixels could be made to turn ON and OFF using electrochromic materials. In this thesis, conjugated polymers (PProDOT-Me2 and PProDOP) or tungsten oxide were employed. The reflection difference between the ON and OFF states was 60%. This was better than previously reported values for other electrochromic materials.
If the electrochromic material instead was incorporated into the nanostructure (metal-electrochromics-metal), applying a voltage would then alter the color of the pixel. If tungsten oxide was used inside the structure, the color of one pixel could change, but it would not be able to span the whole visible spectra. If, instead, the conjugated polymer (PT34bT) was used inside the structure, the whole visible spectra could be accessed with one pixel.
To create a real display, it is not enough to have one pixel that can change color. Millions of pixels in a grid are necessary. This poses a problem since each pixel needs to be individually contacted. This can be overcome by using a matrix configuration such as a passive matrix (PM) or an active matrix (AM). This thesis investigates both these configurations. PM requires the color change to be strongly non-linear with the applied voltage. It must have memory such as hysteresis. This effect can be incorporated by utilizing an indium-tin-oxide electrode as a counter electrode to a metal working electrode coated with a conjugated polymer as electrochromic material. To avoid crosstalk between pixels, a photo patterned electrolyte was used.
Commercial thin-film transistor arrays were used for AM configuration. The red, green, and blue nanostructures were deposited on the array. The conjugated polymer PProDOT-Me2 is synthesized directly on individual pixels and switched without crosstalk.
electrochromism
reflective displays
plasmonic electronic paper
conjugated polymers
structural color
plasmonic
Författare
Oliver Olsson
Chalmers, Kemi och kemiteknik, Tillämpad kemi
Dynamically Tuneable Reflective Structural Coloration with Electroactive Conducting Polymer Nanocavities
Advanced Materials,;Vol. 33(2021)
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High-Contrast Switching of Plasmonic Structural Colors: Inorganic versus Organic Electrochromism
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Artikel i vetenskaplig tidskrift
Comparison of Electrodeposited and Sputtered Tungsten Trioxide Films for Inorganic Electrochromic Nanostructures
ACS Applied Optical Materials,;Vol. 1(2023)p. 558-568
Artikel i vetenskaplig tidskrift
Oliver Olsson, Marika Gugole, Jolie C. Blake, Ioannis Petsagkourakis, Peter Andersson Ersman, Andreas Dahlin.* - Electrochromic Passive Matrix Display Utilizing Diode-Like Redox Reactions on Indium-Tin-Oxide
Oliver Olsson*, Marika Gugole, Jolie C. Blake, Maxim Chukharkin, and Andreas Dahlin. - Electronic paper by plasmonic electrochromic active matrix
Energisparande elektrokromiska platta hybridmaterial
Stiftelsen för Strategisk forskning (SSF) (EM16-0002), 2018-02-01 -- 2022-12-31.
Ämneskategorier
Fysik
Kemi
Annan elektroteknik och elektronik
Fundament
Grundläggande vetenskaper
ISBN
978-91-7905-859-3
Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 5325
Utgivare
Chalmers
KE-salen, Kemigården 4
Opponent: Prof. Sabine Ludwigs, University of Stuttgart