UBC Theses and Dissertations

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UBC Theses and Dissertations

Intrinsically stretchable polymer based electrochromic devices for soft electronic displays Preston, Garth Eden Claire


In soft electronics technology, stretchable displays move away from conventional rigid devices to adopt mechanical properties more similar to organic materials while preserving function, leading to more conformable and biointegrable devices. Progress has been made on luminescent stretchable displays; however, electrochromic materials that change colour instead of emitting light provide key advantages of low power operation, stability and high contrast. Despite this, development of stretchable electrochromic displays has been limited. In this thesis we demonstrate the first intrinsically stretchable fully integrated electrochromic display device. A poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) conducting polymer and (1-butyl-3-methylimidazolium octyl sulfate) ionic liquid conductive composite is used as the intrinsically stretchable electrochromic electrodes, with a stretchable polyvinyl alcohol and phosphoric acid-based electrolyte and transparent styrene-based elastomer substrate to form a single pixel device. Both a transparent and reflective opaque version of the device are made. High contrasts up to ΔTmax=15% for transparent and ΔRmax=20% for opaque cells are shown, and optical modulation degradation as low as ΔT or ΔR=1-3% is shown when the samples are strained from 0% to 30% length. Under 30% strain they show fast switch times

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