DPG Phi
Verhandlungen
Verhandlungen
DPG

Regensburg 2019 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Poster Session III

CPP 37.25: Poster

Mittwoch, 3. April 2019, 11:00–13:00, Poster B1

Monitoring Singlet/Triplet Interconversion in OLEDs — •Ulli von Goscinski, Dirk Hertel, and Klaus Meerholz — University of Cologne, Institute of Physical Chemistry, Luxemburger Str. 116, 50939 Cologne, Germany

In order to reach highest efficiencies in organic light-emitting diodes (OLEDs), excitons from both, singlet as well as triplet states, have to be harvested. Initially, they are distributed in a ratio of 1:3 according to spin statistics. Usually, a conversion between these states by intersystem crossing or reverse intersystem crossing is required to realize highly efficient OLEDs e.g. devices based on thermally activated delayed fluorescence (TADF) [1]-[2]. The rate of interconversion can be directly manipulated by small magnetic fields (< 150 mT). We utilize these magnetic field effects, namely magneto conductivity (MC), magneto electroluminescence (MEL) and magneto photoluminescence (MPL) to monitor singlet/triplet conversion events. The correlation of MEL and MPL is essential to clarify the underlying mechanism because of the different initial population of the singlet and triplet levels upon electro- or photoexcitation. Temperature dependent luminescence and conductivity measurements allow further insights in the nature of spin state conversion in organic emitter molecules.

[1] Zhang, Q. et al., Nat. Photonics 8, 326-332 (2014).

[2] Kaji, H. et al., Nat. Commun. 6, 8476 (2015).

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2019 > Regensburg