Isotope Effect in the Magneto‐Optoelectronic Response of Organic Light‐Emitting Diodes Based on Donor–Acceptor Exciplexes
Abstract
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.
- Authors:
-
[1];
[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
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1804156
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Advanced Materials
- Additional Journal Information:
- Journal Name: Advanced Materials Journal Volume: 32 Journal Issue: 48; Journal ID: ISSN 0935-9648
- Publisher:
- Wiley Blackwell (John Wiley & Sons)
- Country of Publication:
- Germany
- Language:
- English
Citation Formats
Liu, Xiaojie, Popli, Henna, Kwon, Ohyun, Malissa, Hans, Pan, Xin, Park, Bumwoo, Choi, Byoungki, Kim, Sunghan, Ehrenfreund, Eitan, Boehme, Christoph, and Vardeny, Z. Valy. Isotope Effect in the Magneto‐Optoelectronic Response of Organic Light‐Emitting Diodes Based on Donor–Acceptor Exciplexes. Germany: N. p., 2020.
Web. doi:10.1002/adma.202004421.
Liu, Xiaojie, Popli, Henna, Kwon, Ohyun, Malissa, Hans, Pan, Xin, Park, Bumwoo, Choi, Byoungki, Kim, Sunghan, Ehrenfreund, Eitan, Boehme, Christoph, & Vardeny, Z. Valy. Isotope Effect in the Magneto‐Optoelectronic Response of Organic Light‐Emitting Diodes Based on Donor–Acceptor Exciplexes. Germany. https://doi.org/10.1002/adma.202004421
Liu, Xiaojie, Popli, Henna, Kwon, Ohyun, Malissa, Hans, Pan, Xin, Park, Bumwoo, Choi, Byoungki, Kim, Sunghan, Ehrenfreund, Eitan, Boehme, Christoph, and Vardeny, Z. Valy. Thu .
"Isotope Effect in the Magneto‐Optoelectronic Response of Organic Light‐Emitting Diodes Based on Donor–Acceptor Exciplexes". Germany. https://doi.org/10.1002/adma.202004421.
@article{osti_1804156,
title = {Isotope Effect in the Magneto‐Optoelectronic Response of Organic Light‐Emitting Diodes Based on Donor–Acceptor Exciplexes},
author = {Liu, Xiaojie and Popli, Henna and Kwon, Ohyun and Malissa, Hans and Pan, Xin and Park, Bumwoo and Choi, Byoungki and Kim, Sunghan and Ehrenfreund, Eitan and Boehme, Christoph and Vardeny, Z. Valy},
abstractNote = {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.},
doi = {10.1002/adma.202004421},
journal = {Advanced Materials},
number = 48,
volume = 32,
place = {Germany},
year = {Thu Oct 29 00:00:00 EDT 2020},
month = {Thu Oct 29 00:00:00 EDT 2020}
}
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