Comparative analysis of magnetic resonance in the polaron pair recombination and the triplet exciton-polaron quenching models

Mkhitaryan, V. V.; Danilovic, D.; Hippola, C.; Raikh, M. E.; Shinar, J.

doi:10.1103/PhysRevB.97.035402

Title: Comparative analysis of magnetic resonance in the polaron pair recombination and the triplet exciton-polaron quenching models

Journal Article · Wed Jan 03 00:00:00 EST 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.97.035402· OSTI ID:1417356

Mkhitaryan, V. V. ^[1]; Danilovic, D. ^[1]; Hippola, C. ^[1]; Raikh, M. E. ^[2]; Shinar, J. ^[1]

Ames Lab. and Iowa State Univ., Ames, IA (United States)
Univ. of Utah, Salt Lake City, UT (United States)

We present a comparative theoretical study of magnetic resonance within the polaron pair recombination (PPR) and the triplet exciton-polaron quenching (TPQ) models. Both models have been invoked to interpret the photoluminescence detected magnetic resonance (PLDMR) results in π-conjugated materials and devices. We show that resonance line shapes calculated within the two models differ dramatically in several regards. First, in the PPR model, the line shape exhibits unusual behavior upon increasing the microwave power: it evolves from fully positive at weak power to fully negative at strong power. In contrast, in the TPQ model, the PLDMR is completely positive, showing a monotonic saturation. Second, the two models predict different dependencies of the resonance signal on the photoexcitation power, P_L. At low P_L, the resonance amplitude ΔI/I is ∝P_L within the PPR model, while it is ∝P²_L crossing over to P³_L within the TPQ model. On the physical level, the differences stem from different underlying spin dynamics. Most prominently, a negative resonance within the PPR model has its origin in the microwave-induced spin-Dicke effect, leading to the resonant quenching of photoluminescence. The spin-Dicke effect results from the spin-selective recombination, leading to a highly correlated precession of the on-resonance pair partners under the strong microwave power. This effect is not relevant for TPQ mechanism, where the strong zero-field splitting renders the majority of triplets off resonance. On the technical level, the analytical evaluation of the line shapes for the two models is enabled by the fact that these shapes can be expressed via the eigenvalues of a complex Hamiltonian. This bypasses the necessity of solving the much larger complex linear system of the stochastic Liouville equations. Lastly, our findings pave the way towards a reliable discrimination between the two mechanisms via cw PLDMR.

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Research Organization:: Ames Lab., Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-07CH11358; FG02-06ER46313

OSTI ID:: 1417356

Alternate ID(s):: OSTI ID: 1415524

Report Number(s):: IS-J-9557; PRBMDO; TRN: US1801042

Journal Information:: Physical Review B, Vol. 97, Issue 3; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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