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Photoluminescence: Applications

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...

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

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Nanodroplet-Containing Polymers for Efficient Low-Power Light Upconversion.

Roberto Vadrucci¹, Angelo Monguzzi², Felipe Saenz¹

¹Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, CH-1700, Fribourg, Switzerland.

Advanced Materials (Deerfield Beach, Fla.)

|September 13, 2017

Summary

Photon upconversion using triplet-triplet-annihilation (TTA-UC) can be improved in solid materials. New nanodroplet-containing polymers enable efficient TTA-UC, overcoming limitations of previous solid-state methods.

Keywords:

luminescence optically active materials polymeric materials self-assembly triplet-triplet annihilation upconversion

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Area of Science:

Photochemistry
Materials Science
Polymer Chemistry

Background:

Triplet-triplet-annihilation-based photon upconversion (TTA-UC) converts low-energy light to higher energy, suitable for solar energy.
TTA-UC is efficient in low-viscosity solutions but less so in solid materials for device integration.

Purpose of the Study:

To develop efficient solid-state materials for TTA-UC.
To overcome the reduced efficiency of TTA-UC in solid matrices compared to liquid solutions.

Main Methods:

Fabrication of transparent nanodroplet-containing polymers via one-step free-radical polymerization of microemulsions.
Incorporation of upconverting dyes within a dispersed liquid phase inside a continuous polymer matrix.
Exploration of various glassy and rubbery polymer matrices and different dye combinations for TTA-UC.

Main Results:

Achieved upconversion efficiencies up to approximately 15%, comparable to optimized liquid solutions.
Demonstrated the effectiveness of nanodroplet-containing polymers in maintaining TTA-UC performance in solid-state devices.
Showcased the protective role of the polymer matrix against atmospheric oxygen, a known inhibitor of TTA-UC.

Conclusions:

Transparent nanodroplet-containing polymers are a viable strategy for efficient solid-state photon upconversion.
This approach facilitates the integration of TTA-UC into practical devices by overcoming the limitations of solid matrices.
The developed materials offer a promising pathway for advancing solar energy harvesting and other light-conversion technologies.