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Updated: Jan 9, 2026

Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera
Published on: December 27, 2018
Hydrogen-bonding environment suppresses thermally activated delayed fluorescence.
Sushree Suhani Puhan1, Laxmipriya Dash2,3, Palas Roy1
1Department of Chemistry, IIT Bhubaneswar Argul 752050 India palasroy@iitbbs.ac.in.
Protic solvents hinder thermally activated delayed fluorescence (TADF) emission by directly interacting with emitters. This research highlights the crucial role of microenvironment control for developing efficient TADF materials for displays and photocatalysis.
Area of Science:
- Organic electronics
- Photophysics
- Materials science
Background:
- Thermally activated delayed fluorescence (TADF) enables efficient light emission by harvesting triplet excitons.
- Donor-acceptor (D-A) architectures are common in TADF emitters, with conformation influencing performance.
- Intramolecular hydrogen-bonding is a strategy to rigidify D-A structures and enhance TADF.
Purpose of the Study:
- To investigate the impact of the hydrogen-bonding medium on TADF emission.
- To elucidate the role of solvent-emitter interactions in TADF performance.
Main Methods:
- Steady-state and time-resolved emission spectroscopy.
- Ultrafast spectroscopy.
- Kinetic isotope effect studies.
Main Results:
- Protic solvents significantly quench TADF emission and reduce prompt emission lifetimes.
- Solvent protons directly participate in hydrogen-bonding with photoexcited emitters, altering excited-state energetics.
- Solvent viscosity and protic nature influence D-A torsional relaxation and excited-state conformations, diminishing emission.
Conclusions:
- Microenvironment control is critical for designing efficient TADF emitters.
- Solvent-emitter hydrogen-bonding interactions can unfavorably impact excited-state conformations and reduce emission efficiency.
- Findings are relevant for optimizing TADF materials in display technology and photocatalysis.
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