What question did this study set out to answer?

This research aims to locate the Sn≥2 states in thermally activated delayed fluorescence (TADF) emitters.

July 14, 2026

Cover Feature: Accessing S n≥2 States of a TADF Emitter by Femtosecond NIR Spectroscopy

WHWiebke HaselbachHeinrich Heine University Düsseldorf JMJasmin MatthesHeinrich Heine University Düsseldorf APAndreas PrüferTU Dortmund University

Key Points

This research aims to locate the Sn≥2 states in thermally activated delayed fluorescence (TADF) emitters.
Conducted a femtosecond pump–probe experiment.
Probed excited states covering the UV/Vis and NIR range.
Successfully identified the energetic locations of Sn≥2 states in TADF emitters.

Abstract

Higher excited states (Sn≥2 and Tn≥2) affect the transitions between singlet and triplet excitations in molecules exhibiting thermally activated delayed fluorescence (TADF) like the one depicted in this Cover Feature. The Sn≥2 states of such molecules can be located energetically in a femtosecond pump–probe experiment with probing covering the UV/Vis and NIR range. More details are provided in the Research Article by P. Gilch and co-workers (DOI: 10.1002/chem.70875). Artwork by Wiebke Haselbach and Marie Haselbach.

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