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Multilayer films for photon upconversion-driven photoswitching.

Zhihang Wang¹, Beatrice E Jones¹, Larissa G Franca¹

¹Department of Materials Science and Metallurgy, University of Cambridge 27 Charles Babbage Road Cambridge CB3 0FS UK rce26@cam.ac.uk.

Journal of Materials Chemistry. C

|November 29, 2024

Summary

This summary is machine-generated.

Triplet-triplet annihilation upconversion (TTA-UC) enables photoswitching of norbornadiene-quadricyclane (NBD-QC) materials using visible light. This method overcomes absorption limitations, expanding applications for photoswitchable polymers.

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Area of Science:

Materials Science
Photochemistry
Polymer Chemistry

Background:

Photoswitchable materials are crucial for advanced applications like energy storage and robotics.
Limited absorption spectra often restrict their practical use.
Indirect excitation via photophysical pathways, such as triplet sensitization or photon upconversion, offers a solution.

Purpose of the Study:

To demonstrate triplet-triplet annihilation upconversion (TTA-UC) for solid-state photoswitching of norbornadiene-quadricyclane (NBD-QC).
To utilize visible light for NBD-QC photoswitching, overcoming UV-light limitations.
To explore the potential of TTA-UC in extending the operational spectral window for photoswitchable materials.

Main Methods:

Fabrication of a bilayer polymer film containing a TTA-UC system (platinum octaethylporphyrin and 9,10-diphenylanthracene) and NBD-QC.
Characterization of the TTA-UC system's upconversion efficiency in the solid-state.
Testing indirect photoswitching of NBD-QC using visible light through spectral overlap with TTA-UC emission.

Main Results:

Achieved green-to-blue upconversion with a competitive efficiency of (1.9 ± 0.1%) in the solid-state.
Demonstrated successful indirect photoswitching of NBD-QC using visible green light (532 nm).
Confirmed spectral overlap between upconverted blue emission and NBD absorbance, enabling visible light activation.

Conclusions:

TTA-UC can effectively drive solid-state photoswitching of NBD-QC materials.
This approach broadens the usable light spectrum for photoswitching applications.
Paves the way for light-harvesting devices and smart coatings utilizing visible light activation.