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Organic full-color narrowband afterglow.
Yincai Xu1, Yufeng Xue1, Le Mei2
1Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585, Singapore. cheliub@nus.edu.cn.
Materials Horizons
|July 21, 2025
Summary
Researchers developed a new method for creating full-color organic narrowband afterglow (OFNA) for flexible electronics. This strategy uses boron-nitrogen emitters and a TTPO host matrix, enabling low-cost, high-purity color displays.
Area of Science:
- Materials Science
- Organic Electronics
- Photophysics
Background:
- Developing organic full-color narrowband afterglow (OFNA) is crucial for low-cost, high-purity displays in flexible electronics.
- Existing methods often lack universality or cost-effectiveness.
Purpose of the Study:
- To establish a facile and universally applicable strategy for achieving organic full-color narrowband afterglow (OFNA).
- To enable high-color-purity displays and advanced applications in flexible electronics.
Main Methods:
- A general protocol involving mixing, melting, and cooling of boron-nitrogen-containing multiple resonance thermally activated delayed fluorescence (MR-TADF) emitters with a tri(2-methylphenyl)phosphine oxide (TTPO) host matrix.
- Photoactivation of the blended films.
- Molecular dynamics simulations to understand the role of the host matrix.
Main Results:
- Achieved OFNA with emission peaks from 468 to 669 nm.
- Narrow emission with full-width at half-maximum values of ≤0.21 eV.
- Demonstrated the formation of a rigid glassy morphology by TTPO, which stabilizes fluorophores and facilitates afterglow emission through triplet-singlet repopulation.
Conclusions:
- The developed strategy provides a universal method for OFNA using MR-TADF emitters and a TTPO host.
- The rigid microenvironment created by TTPO is key to stabilizing emitters and achieving efficient afterglow.
- Successfully demonstrated applications in flexible organic afterglow fibers, optical waveguide fibers, and data encryption.
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