Our recent paper together with our colleagues at the Leibniz Institute of Polymer Research Dresden (IPF), is featured in Advanced Science News. This work discusses a novel way to achieve thermally activated delayed fluorescence in polymers through an extension of the HOMO conjugation, which ultimately leads to a smaller splitting between singlet and triplet excited charge transfer states. The paper can be found here: Conjugation-Induced Thermally Activated Delayed Fluorescence (TADF): From Conventional Non-TADF Units to TADF-Active Polymers.
This announcement comes in parallel with the start of the session Excitons in Organic and Hybrid Systems I of our Symposium EP1, which began 5 minutes ago. Today we are looking in more detail on processes connected with excitons in organic and hybrid systems. We will see sophisticated techniques, modeling, etc.
Here are some keywords that we will come across during the morning program:
- Nanoscale exciton migration
- QM/MM simulation of TADF materials
- Exciton migration in TADF materials
- Exciton transport in colloidal QDs
- Spin oscillations
- Single molecule look on TADF
- Spatial confinement of triplet excitons in rubrene
- Exciton processes in OLEDs
Our invitees are Naomi Ginsberg, William Tisdale, John Lupton, and Grayson Ingram.
A new paper was just published in Applied Physics Letters entitled ‘High efficiency, dual emission from an organic semiconductor‘. The work describes the observation of highly efficient luminescence of both singlet and triplet states of a purely organic semiconductor, namely N,N’-bis(4-benzoyl-phenyl)-N,N’-diphenyl-benzidine, at room temperature. This unusual observation is the result of a very effective suppression of non-radiative modes within the triplet manifold of the molecule, enabling high efficiency phosphorescence. Together with efficient fluorescence, this molecule transforms in a dual state emitter, a phenomenon we term ‘biluminescence’. As neither singlet nor triplet states are a loss channel in the emitter molecule, the mixing between the two states through intersystem crossing (ISC) and back (reverse ISC) only dictates the relative intensities of fluorescence and phosphorescence. An biluminescence emitter may find future applications as ultra broadband emitters, exciton probes, various types of sensors, and spin independent energy transfer intermediates.