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Title: Magneto-electroluminescence response in 2D and 3D hybrid organic–inorganic perovskite light emitting diodes

Abstract

We have studied the magneto-electroluminescence (MEL) response in light emitting diodes based on 2D-(PEA)2PbI4 and 3D-MAPbI3 hybrid organic–inorganic perovskites at cryogenic temperatures. We found that the MEL is negative, i.e., the EL decreases with the applied field strength, B. In addition, the MEL(B) response has a Lorentzian line shape whose width depends on the perovskite used. We interpret the MEL(B) response using the “Δg mechanism” in which the spin of the injected electron–hole (e–h) pairs oscillates between singlet and triplet configurations due to different precession frequencies of the electron and hole constituents that originate from the difference, Δg, in the electron and hole gyromagnetic constants, g. In this model, the MEL(B) linewidth is inversely proportional to the spin lifetime and Δg. The model used is validated by directly measuring the spin lifetime of photogenerated e–h pairs using the circularly polarized pump–probe transmission technique with 100 fs resolution.

Authors:
 [1]; ORCiD logo [1];  [1]; ORCiD logo [1]
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  1. Univ. of Utah, Salt Lake City, UT (United States)
Publication Date:
Research Org.:
Univ. of Utah, Salt Lake City, UT (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
OSTI Identifier:
1802682
Alternate Identifier(s):
OSTI ID: 1595862
Grant/Contract Number:  
SC0014579; ECCS-1608095; 0014579
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 152; Journal Issue: 4; Journal ID: ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Chemistry; Physics

Citation Formats

Pan, Xin, Liu, Haoliang, Huynh, Uyen, and Vardeny, Z. Valy. Magneto-electroluminescence response in 2D and 3D hybrid organic–inorganic perovskite light emitting diodes. United States: N. p., 2020. Web. doi:10.1063/1.5132982.
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Pan, Xin, Liu, Haoliang, Huynh, Uyen, & Vardeny, Z. Valy. Magneto-electroluminescence response in 2D and 3D hybrid organic–inorganic perovskite light emitting diodes. United States. https://doi.org/10.1063/1.5132982
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Pan, Xin, Liu, Haoliang, Huynh, Uyen, and Vardeny, Z. Valy. Wed . "Magneto-electroluminescence response in 2D and 3D hybrid organic–inorganic perovskite light emitting diodes". United States. https://doi.org/10.1063/1.5132982. https://www.osti.gov/servlets/purl/1802682.
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@article{osti_1802682,
title = {Magneto-electroluminescence response in 2D and 3D hybrid organic–inorganic perovskite light emitting diodes},
author = {Pan, Xin and Liu, Haoliang and Huynh, Uyen and Vardeny, Z. Valy},
abstractNote = {We have studied the magneto-electroluminescence (MEL) response in light emitting diodes based on 2D-(PEA)2PbI4 and 3D-MAPbI3 hybrid organic–inorganic perovskites at cryogenic temperatures. We found that the MEL is negative, i.e., the EL decreases with the applied field strength, B. In addition, the MEL(B) response has a Lorentzian line shape whose width depends on the perovskite used. We interpret the MEL(B) response using the “Δg mechanism” in which the spin of the injected electron–hole (e–h) pairs oscillates between singlet and triplet configurations due to different precession frequencies of the electron and hole constituents that originate from the difference, Δg, in the electron and hole gyromagnetic constants, g. In this model, the MEL(B) linewidth is inversely proportional to the spin lifetime and Δg. The model used is validated by directly measuring the spin lifetime of photogenerated e–h pairs using the circularly polarized pump–probe transmission technique with 100 fs resolution.},
doi = {10.1063/1.5132982},
journal = {Journal of Chemical Physics},
number = 4,
volume = 152,
place = {United States},
year = {Wed Jan 29 00:00:00 EST 2020},
month = {Wed Jan 29 00:00:00 EST 2020}
}
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https://doi.org/10.1063/1.5132982
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