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Updated: May 20, 2025

Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development

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Modulation of delayed fluorescence pathways via rational molecular engineering.

Sanchari Debnath¹, Pria Ramkissoon², Ulrike Salzner³

¹Solid State and Structural Chemistry Unit, Indian Institute of Science, Bengaluru, India.

Nature Communications

|March 27, 2025

Summary

This summary is machine-generated.

Researchers achieved dual thermally activated delayed fluorescence (TADF) and triplet-triplet annihilation (TTA) in organic semiconductors. This breakthrough enhances organic light-emitting diode (OLED) efficiency by minimizing triplet exciton losses through rational molecular design.

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A Step Beyond BRET: Fluorescence by Unbound Excitation from Luminescence FUEL

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Published on: May 23, 2014

Area of Science:

Materials Science
Organic Electronics
Photophysics

Background:

Organic light-emitting diodes (OLEDs) face efficiency limitations due to triplet exciton losses.
Thermally activated delayed fluorescence (TADF) and triplet-triplet annihilation (TTA) are strategies to harvest triplet excitons.
Simultaneously achieving TADF and TTA in a single organic chromophore for solid-state applications is challenging.

Purpose of the Study:

To demonstrate dual TADF and TTA in donor-acceptor phthalimide derivatives.
To investigate the influence of donor units (triphenylamine vs. phenyl carbazole) on emission mechanisms.
To provide insights into realizing dual delayed fluorescence pathways in molecular semiconductors.

Main Methods:

Synthesis of donor-acceptor phthalimide derivatives with triphenylamine (TPA) or phenyl carbazole (PhCz) donors.
Fabrication of thin films using doped matrices (TPA derivatives in PMMA) and neat films (PhCz derivatives).
Photophysical characterization to analyze emission mechanisms, including TADF and TTA.

Main Results:

TPA-substituted phthalimides exhibited TADF emission from the singlet charge-transfer (CT) state in doped films.
PhCz-substituted emitters displayed dominant TTA-induced delayed fluorescence in neat films.
Efficient triplet diffusion in neat PhCz films facilitated TTA, attributed to long-range molecular ordering.

Conclusions:

Rational molecular design enables dual TADF and TTA mechanisms in organic semiconductors.
The choice of donor unit and film morphology dictates the dominant delayed fluorescence pathway.
This work offers a pathway to enhance OLED efficiency by controlling exciton dynamics.