Evidence map›Paper›PMID 32175310›Full record

ArticleFrontiers in chemistry2020

Sensitizing TADF Absorption Using Variable Length Oligo(phenylene ethynylene) Antennae.

Olga Franco, Marius Jakoby, Rebekka V Schneider, Fabian Hundemer, Daniel Hahn, Bryce S Richards, Stefan Bräse, Michael A R Meier, Uli Lemmer, Ian A Howard

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Article in Frontiers in chemistry, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.

0numbers the graph read from it
0cells of the map it votes in
2citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

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Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

2 citing papers in PubMed.

  1. Article
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

10 authors.

Olga FrancoDepartment of Electrical Engineering and Information Technology, Light Technology Institute, Karlsruhe Institute of Technology, Karlsruhe, Germany.
Marius JakobyDepartment of Electrical Engineering and Information Technology, Institute of Microstructure Technology, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany.
Rebekka V SchneiderLaboratory of Applied Chemistry, Institute of Organic Chemistry, Karlsruhe Institute of Technology, Karlsruhe, Germany.
Fabian HundemerInstitute of Organic Chemistry, Karlsruhe Institute of Technology, Karlsruhe, Germany.
Daniel HahnLaboratory of Applied Chemistry, Institute of Organic Chemistry, Karlsruhe Institute of Technology, Karlsruhe, Germany.
Bryce S RichardsDepartment of Electrical Engineering and Information Technology, Light Technology Institute, Karlsruhe Institute of Technology, Karlsruhe, Germany.
Stefan BräseInstitute of Organic Chemistry, Karlsruhe Institute of Technology, Karlsruhe, Germany.
Michael A R MeierLaboratory of Applied Chemistry, Institute of Organic Chemistry, Karlsruhe Institute of Technology, Karlsruhe, Germany.
Uli LemmerDepartment of Electrical Engineering and Information Technology, Light Technology Institute, Karlsruhe Institute of Technology, Karlsruhe, Germany.
Ian A HowardDepartment of Electrical Engineering and Information Technology, Light Technology Institute, Karlsruhe Institute of Technology, Karlsruhe, Germany.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Beyond their applications in organic light-emitting diodes (OLEDs), thermally activated delayed fluorescence (TADF) materials can also make good photonic markers. Time-gated measurement of their delayed emission enables "background-free" imaging in, for example, biological systems, because no naturally-occurring compounds exhibit such long-lived emission. Attaching a strongly-absorbing antenna, such as a phenylene ethynylene oligomer, to the TADF core would be of interest to increase their brightness as photonic markers. With this motivation, we study a sequence of TADF-oligomer conjugates with oligomers of varying length and show that, even when the absorption of the oligomer is almost resonant with the charge-transfer absorption of the TADF core, the antenna transfers energy to the TADF core. We study this series of compounds with time resolved emission and transient absorption spectroscopy and find that the delayed fluorescence is essentially turned-off for the longer antennae. Interestingly, we find that the turn-off of the delayed fluorescence is not caused by quenching of the TADF charge-transfer triplet state due to triplet energy transfer of the lower-lying triplet state to the antenna, but must be associated with a decrease in the reverse intersystem crossing rate. These results are of relevance for the further development of TADF "dyes" and also, in the broader context, for understanding the dynamics of TADF molecules in the vicinity of energy donors/acceptors (i.e., in fluorescent OLEDs wherein TADF molecules are used as an assistant dopant).

Indexed as

charge-transfer state (CT-state)sequence-define oligomerthermally activated delayed fluorescence (TADF)time-resolved photoluminescence spectroscopytransient absorption spectroscopy (TAS)

Identifiers

PMID32175310
PMCPMC7054278

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