Spin-Dependent Charge-Carrier Recombination Processes in Tris(8-Hydroxyquinolinato) Aluminum

H. Popli, X. Liu, T.H. Tennahewa, M.Y. Teferi, E. Lafalce, H. Malissa, Z.V. Vardeny, and C. Boehme
Phys. Rev. Applied 14, 034012 – Published 3 September 2020

Abstract

We study the nature and dynamics of spin-dependent charge-carrier recombination in tris(8-hydroxyquinolinato) aluminum (Alq3) films in light-emitting diodes at room temperature using continuous-wave and pulsed electrically detected magnetic resonance (EDMR) spectroscopy. We find that the EDMR signal is dominated by an electron-hole recombination process and another weaker EDMR signal, the fundamental nature of which is investigated. From the pulsed EDMR measurements, we obtain a carrier-spin-relaxation time, T2= 45 ns ± 25 ns, which is much shorter than that of T2 in conjugated polymers, but relatively long for a molecule containing elements with a high atomic number. Using multifrequency continuous-wave EDMR spectroscopy, we obtain the local hyperfine field distributions for electrons and holes, as well as their respective spin-orbit-coupling-induced g-factor and g-strain values.

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  • Received 2 April 2020
  • Revised 25 June 2020
  • Accepted 20 July 2020

DOI:https://doi.org/10.1103/PhysRevApplied.14.034012

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

H. Popli, X. Liu, T.H. Tennahewa, M.Y. Teferi, E. Lafalce, H. Malissa*, Z.V. Vardeny, and C. Boehme

  • Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA

  • *hans.malissa@utah.edu

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Vol. 14, Iss. 3 — September 2020

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