Journal
ORGANIC ELECTRONICS
Volume 14, Issue 5, Pages 1376-1382Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2013.02.031
Keywords
Interfacial layer; Magnetoconductance; Magnetoelectroluminescence; Polymer light-emitting diodes
Funding
- National Science Council (NSC) of Taiwan [NSC 100-2221-E006-165-MY2, NSC 100-2811-M-006-054, NSC-99-2113-M-006-008-MY3, NSC 101-2811-M-006-007]
- Asian office of Aerospace Research and Development [AOARD 10-4054]
- NSC of Taiwan [NSC 100-2811-M-006-045]
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Antagonistic responses between magnetoconductance (MC) and magnetoelectroluminescence (MEL) in the polymer light-emitting diodes with an interfacial layer between Al cathode and active layer are simultaneously measured. As the interfacial layer (tetraoctylammonium bromide) is used, the significant increase in the number of injected negative polarons and the blocking of positive polarons promote the triplets-(free polaron) reaction and provide a good explanation for the reason that electroluminescence (EL) efficiency is maximal in the trap free space charge limited current regime at high bias. By fitting of MC and MEL curves using Lorentzian and non-Lorentzian empirical equations, three magnetic field dependent mechanisms, which are the intersystem crossing between singlet/triplet polaron pairs, the triplets-(free polaron) reaction, and the triplets-(trapped polaron) reaction are elucidated. The distribution of the three components is tunable by varying the applied electric field, which primarily modulates the triplets-(free polaron) reaction rate. The results pave a new route toward understanding the mechanism of organic spintronics for developing of multifunctional devices. (C) 2013 Elsevier B. V. All rights reserved.
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