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Photochemical Upconversion.

Jiale Feng¹, Jessica Alves¹, Damon M de Clercq¹

¹Australian Research Council Centre of Excellence in Exciton Science, School of Chemistry, The University of New South Wales, Sydney, New South Wales, Australia;

Annual Review of Physical Chemistry

|January 25, 2023

Summary

This summary is machine-generated.

Photochemical upconversion converts low-energy photons to high-energy ones using triplet-triplet annihilation. This review explores the science behind upconversion, focusing on efficiency and potential applications.

Keywords:

kinetics magnetic field effect sensitizer-chromophore pair spin statistical limit triplet–triplet annihilation upconversion quantum yield

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Area of Science:

Photochemistry
Physical Chemistry
Materials Science

Background:

Photochemical upconversion (UC) involves converting two low-energy photons into one higher-energy photon via sensitized triplet-triplet annihilation.
While UC has applications in solar cells, its potential extends to diverse fields.
Understanding the fundamental physicochemical phenomena is crucial for advancing UC technologies.

Purpose of the Study:

To review the underlying physicochemical phenomena of photochemical upconversion.
To discuss the kinetics, sensitizers, and annihilators essential for efficient UC systems.
To explore spin physics, magnetic field effects, and light-matter coupling for enhanced UC.

Main Methods:

Review of existing literature on photochemical upconversion mechanisms.
Analysis of kinetic models governing triplet-triplet annihilation.
Discussion of theoretical and experimental studies on spin physics and light-matter interactions.

Main Results:

Detailed examination of the physicochemical principles governing photochemical upconversion.
Identification of key parameters for designing efficient sensitizers and annihilators.
Explanation of how spin states influence UC efficiency and magnetic field effects.

Conclusions:

Photochemical upconversion is a versatile process with broad application potential.
Optimizing sensitizer/annihilator design and understanding spin physics are key to improving UC efficiency.
Exploring light-matter coupling offers new avenues for UC enhancement.