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Efficient Organic D-π-A Scintillators for Temperature-Adaptive X-Ray Imaging.

Jing Sun^1,2, Meijuan Ding², Huili Ma²

¹Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education, Taiyuan University of Technology, 79 Yingze West Street, Taiyuan, 030024, P. R. China.

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|June 4, 2025

Summary

Researchers developed new organic scintillators for X-ray imaging by adding fluorine atoms to D-π-A molecules. These materials show efficient light emission and stable performance across temperatures, enabling advanced X-ray detection.

Keywords:

D‐π‐A structures aggregation‐induced delayed fluorescence organic scintillators room temperature phosphorescence thermally activated delayed fluorescence

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Area of Science:

Materials Science
Organic Electronics
Photophysics

Background:

Organic scintillators are crucial for X-ray imaging but face challenges in efficient exciton decay.
Developing materials with rapid radiative decay for both singlet and triplet excitons is a key hurdle.

Purpose of the Study:

To introduce a novel design strategy for efficient organic scintillators using fluorine-modified D-π-A molecules.
To investigate the photophysical properties and X-ray detection capabilities of these new materials.

Main Methods:

Synthesized D-π-A molecules (1FAT and 2FAT) with fluorine atoms incorporated into the π-bridge.
Evaluated photoluminescence, thermally activated delayed fluorescence (TADF), aggregation-induced delayed fluorescence (AIDF), and room temperature phosphorescence (RTP).
Assessed radioluminescence performance of 1FAT doped in PMMA film under X-ray excitation.

Main Results:

1FAT and 2FAT emitters demonstrated efficient TADF, AIDF, and RTP properties.
1FAT@PMMA film showed stable, intense emission from 77 to 363 K, indicating excellent temperature adaptability.
1FAT@PMMA film achieved a low X-ray detection limit (62.27 nGy s⁻¹) and high spatial resolution (>20 lp mm⁻¹).

Conclusions:

A novel design strategy using fluorine modification of D-π-A molecules enables efficient organic scintillators.
The developed materials exhibit superior temperature adaptability and radioluminescence performance.
This approach holds significant potential for flexible, stretchable X-ray detectors and advanced imaging.