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Pseudo-Homologue Doping Strategy for Afterglow Materials.

Jiayu Wang¹, Liangwei Ma¹, Bingbing Ding¹

¹Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center, Frontiers Science Center For Materiobiology and Dynamic Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, China.

Angewandte Chemie (International Ed. in English)

|March 18, 2026

Summary

This summary is machine-generated.

Trace impurities, identified as biphenyl carboxylic acid derivatives, are responsible for the afterglow in benzene-carboxylic acid (BCA) materials. A new pseudo-homologues strategy significantly improves the success rate of creating these dual-component afterglow materials.

Keywords:

impurity isomers phosphorescence photochemistry pseudo‐homologues

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Area of Science:

Organic Chemistry
Materials Science
Photophysics

Background:

Impurities in organic phosphorescent materials are a subject of recent scientific interest.
The afterglow properties of commercial benzene-carboxylic acid (BCA) derivatives have been observed but not fully understood.

Purpose of the Study:

To identify the specific impurities responsible for the afterglow in BCA derivatives.
To develop a novel strategy for constructing efficient dual-component afterglow materials based on structural similarities.

Main Methods:

Chemical analysis to identify trace impurities in BCA derivatives.
Synthesis and characterization of 275 doped samples using a pseudo-homologues strategy.
Evaluation of phosphorescence and afterglow properties of the synthesized materials.

Main Results:

Trace amounts of biphenyl carboxylic acid derivatives were identified as the source of afterglow in BCA materials.
One impurity induced phosphorescence at doping levels as low as 0.1 ppm.
The pseudo-homologues strategy achieved a 73.3% success rate for afterglow materials, significantly higher than other samples (6.5%).

Conclusions:

The study elucidates the role of specific impurities in enabling afterglow in organic materials.
A pseudo-homologues strategy provides a new framework for designing dual-component afterglow materials.
This approach offers valuable insights for the development of advanced luminescent materials.