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Photoluminescence: Applications

Photoluminescence: Applications

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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Updated: Jun 20, 2026

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts

Published on: August 7, 2018

Multi-Stimuli-Responsive Mechanoluminescent Manganese Halide Toward External-Light-Free Photochemistry.

Qiushuang Li¹, Jinxing Geng², Chengjie Peng³

¹State Key Laboratory of High Pressure and Superhard Materials, College of Physics, Jilin University, Changchun, China.

Angewandte Chemie (International Ed. in English)

|June 18, 2026

Summary

Researchers developed a novel mechanoluminescent manganese halide, (ETP)2MnBr4, enabling solvent-free synthesis of sulfones via mechanical force. This breakthrough avoids external light and solvents, paving the way for sustainable photochemistry.

Keywords:

0D manganese halide anti‐counterfeiting high pressure mechanoluminescence photosynthesis

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Published on: May 29, 2018

Area of Science:

Materials Science
Organic Chemistry
Photochemistry

Background:

Solvent-free mechanochemistry offers environmental benefits but faces challenges integrating with photochemistry due to reactor opacity.
Conventional photochemical methods often require external light sources and solvents, limiting efficiency and sustainability.

Purpose of the Study:

To synthesize a novel mechanoluminescent (ML) material for solvent-free photochemical reactions.
To demonstrate the use of ML (ETP)2MnBr4 in triggering sulfonylation reactions without external light or solvents.
To investigate the stimuli-responsive properties of the synthesized ML material.

Main Methods:

Synthesis of mechanoluminescent (ML) manganese halide (ETP)2MnBr4.
Mechanochemical sulfonylation reactions to produce alkenyl and allyl sulfones.
Piezoresponse force microscopy and pressure-dependent dipole moment analysis.
Investigation of piezochromism and anti-thermal emission quenching.

Main Results:

Achieved 65%-85% yields of alkenyl and allyl sulfones using solvent-free mechanochemistry.
Demonstrated that mechanical stress enhances piezoelectric response, inducing mechanoluminescence.
Observed significant piezochromism (174 nm redshift) and anti-thermal emission quenching in (ETP)2MnBr4.
Correlated piezochromism to increased crystal field strength and decreased Mn-Br bond length under pressure.

Conclusions:

(ETP)2MnBr4 is a promising ML material for sustainable photochemistry.
The material enables efficient, solvent-free synthesis of valuable organic compounds.
Its multi-stimuli-responsive properties suggest potential applications in sensing and anti-counterfeiting.