Isotope Effect in the Magneto‐Optoelectronic Response of Organic Light‐Emitting Diodes Based on Donor–Acceptor Exciplexes

Liu, Xiaojie; Popli, Henna; Kwon, Ohyun; Malissa, Hans; Pan, Xin; Park, Bumwoo; Choi, Byoungki; Kim, Sunghan; Ehrenfreund, Eitan; Boehme, Christoph; Vardeny, Z. Valy

doi:10.1002/adma.202004421

Title: Isotope Effect in the Magneto‐Optoelectronic Response of Organic Light‐Emitting Diodes Based on Donor–Acceptor Exciplexes

Journal Article · Thu Oct 29 00:00:00 EDT 2020 · Advanced Materials

DOI:https://doi.org/10.1002/adma.202004421· OSTI ID:1804156

Liu, Xiaojie ^[1]; Popli, Henna ^[1]; Kwon, Ohyun ^[2];

^[1]; Pan, Xin ^[1]; Park, Bumwoo ^[2]; Choi, Byoungki ^[2]; Kim, Sunghan ^[2]; Ehrenfreund, Eitan ^[3];

^[1];

^[1]

Department of Physics and Astronomy University of Utah 115 South 1400 East Salt Lake City UT 84112 USA
Samsung Advanced Institute of Technology Samsung Electronics Co., Ltd. 130, Samsung‐Ro, Youngtong‐Gu Suwon‐Si Gyeonggi‐do 16678 Republic of Korea
Physics Department Technion‐Israel Institute of Technology Haifa 32000 Israel

Abstract The isotope effect is studied in the magneto‐electroluminescence (MEL) and pulsed electrically detected magnetic resonance of organic light‐emitting diodes based on thermally activated delayed fluorescence (TADF) from donor–acceptor exciplexes that are either protonated (H) or deuterated (D). It is found that at ambient temperature, the exchange of H to D has no effect on the spin‐dependent current and MEL responses in the devices. However, at cryogenic temperatures, where the reverse intersystem crossing (RISC) from triplet to singlet exciplex diminishes, a pronounced isotope effect is observed. These results show that the RISC process is not governed by the hyperfine interaction as thought previously, but proceeds through spin‐mixing in the triplet exciplex. The observations are corroborated by electrically detected transient spin nutation experiments that show relatively long dephasing time at ambient temperature, and interpreted in the context of a model that involves exchange and hyperfine interactions in the spin triplet exciplex. These findings deepen the understanding of the RISC process in TADF materials.

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Sponsoring Organization:: USDOE

OSTI ID:: 1804156

Journal Information:: Advanced Materials, Journal Name: Advanced Materials Vol. 32 Journal Issue: 48; ISSN 0935-9648

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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