Color-tunable triple state 'smart' window

Gilles H. Timmermans, Jiajun Wu, Albert P.H.J. Schenning, J. Lin (Corresponding author), Michael G. Debije (Corresponding author)

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Materials that rapidly change their optical properties in response to external stimuli are crucial for displays and ‘smart’ window applications. In this work, we describe a fluorescent red dye modified with liquid crystal side chains to be interactive with a liquid crystal host resulting in a color-tunable triple state smart window. The dye solubilizes in the liquid crystal matrix with increasing temperature, resulting in a red colored, absorbing state, recovering transparency again by re-aggregation of the dye within minutes upon cooling. This dye is used to fabricate a device that can be electrically switched from a red colored, absorbing state to an intermediate scattering state, and at greater electrical fields, a transparent state. Using a second dichroic fluorescent dye, heating the device transitions the window’s color from yellow/green to red. The multi-responsive optical changes could find applications in many fields including displays, smart windows, electricity generation and signage.
Original languageEnglish
Article number2100134
Number of pages7
JournalAdvanced Photonics Research
Issue number10
Publication statusPublished - 7 Oct 2021


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