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Related Experiment Video

Updated: May 23, 2026

A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles

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Multimodal fluorescence modulation using molecular photoswitches and upconverting nanoparticles.

Carl-Johan Carling¹, John-Christopher Boyer, Neil R Branda

¹4D LABS, Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, BC, Canada.

Organic & Biomolecular Chemistry

|April 20, 2012

Summary

Researchers controlled light emission from upconverting nanoparticles using photoresponsive dithienylethene ligands. Selective ligand activation enabled multimodal light read-out, offering tunable optical properties.

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Area of Science:

Materials Science
Nanotechnology
Photochemistry

Background:

Upconverting nanoparticles (UCNPs) offer unique optical properties for various applications.
Controlling UCNP emission intensity and color is crucial for advanced functionalities.
Photoresponsive molecules can modulate material properties upon light irradiation.

Purpose of the Study:

To demonstrate the control of light emission from UCNPs using surface-decorated photoresponsive ligands.
To investigate the effect of dithienylethene ligand activation on UCNP optical output.
To achieve a multimodal read-out system by selectively activating ligands in a mixed system.

Main Methods:

Synthesis and surface functionalization of upconverting nanoparticles with dithienylethene ligands.
Selective photo-switching of dithienylethene ligands using specific wavelengths of light.
Spectroscopic analysis to characterize the emitted light's intensity and color modulation.

Main Results:

The emission intensity and color of UCNPs were successfully tuned by altering the state of the dithienylethene ligands.
Selective activation of one or both ligands in a three-component system resulted in distinct optical responses.
A multimodal read-out of the emitted light was achieved, demonstrating tunable optical properties.

Conclusions:

Photoresponsive dithienylethene ligands provide effective external control over UCNP luminescence.
This approach enables the development of switchable and tunable optical materials.
The multimodal read-out capability opens possibilities for advanced sensing and display technologies.