Exciton dynamics at the heteromolecular interface between N,N′-dioctyl-3,4,9,10-perylenedicarboximide and quaterrylene, studied using time-resolved photoluminescence

Nobuya Hiroshiba, Kenta Morimoto, Ryoma Hayakawa, Yutaka Wakayama, Tatsuo Mori, Kiyoto Matsuishi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

To elucidate the exciton dynamics at the heteromolecular interface, the temperature dependence of time-resolved photoluminescence (TRPL) spectra of neat-N,N′-dioctyl-3,4,9,10-perylenedicarboximide (PTCDI-C8) and PTCDI-C8/Quaterrylene (QT) heteromolecular thin films was investigated. The lifetimes of excitons were evaluated to identify the Frenkel (FE), high energy charge-transfer (CTEhigh), low energy charge-transfer (CTElow), and excimer exciton states. The thermal activation energy (Δact) of CTElow in PTCDI-C 8 thin film was evaluated as 25 meV, which is 1/5 of that of FE, indicating that CTElow is more thermally sensitive than FE in PTCDI-C8 thin film. We investigated the exciton transport length (l) along the vertical direction against the substrate surface in PTCDI-C 8/QT thin film at 30 K, and demonstrated that lFE = 9.9 nm, lCTElow = 4.2 nm, lCTEhigh = 4.3 nm, and l excimer = 11.9 nm. To elucidate the difference in l among these excitons, the activation energies (Ea) for quenching at the heteromolecular interface were investigated. Ea values were estimated to be 13.1 meV for CTElow and 18.6 meV for CTEhigh. These values agree with the thermal sensitivity of CTEs as reported in a previous static PL study. This latter situation is different from the case of FE and excimer excitons, which are transported via a resonant process and have no temperature dependence. The small Ea values of CTEs suggest that exciton transport takes place via a thermal hopping process in CTEs. The present experimental study provides information on nano-scaled exciton dynamics in a well-defined PTCDI-C8 (2 ML)/QT (2 ML) system.

Original languageEnglish
Article number67112
JournalAIP Advances
Volume4
Issue number6
DOIs
Publication statusPublished - 2014 Jan 1
Externally publishedYes

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excitons
photoluminescence
excimers
thin films
charge transfer
activation energy
temperature dependence
quenching
life (durability)
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Exciton dynamics at the heteromolecular interface between N,N′-dioctyl-3,4,9,10-perylenedicarboximide and quaterrylene, studied using time-resolved photoluminescence. / Hiroshiba, Nobuya; Morimoto, Kenta; Hayakawa, Ryoma; Wakayama, Yutaka; Mori, Tatsuo; Matsuishi, Kiyoto.

In: AIP Advances, Vol. 4, No. 6, 67112, 01.01.2014.

Research output: Contribution to journalArticle

Hiroshiba, Nobuya ; Morimoto, Kenta ; Hayakawa, Ryoma ; Wakayama, Yutaka ; Mori, Tatsuo ; Matsuishi, Kiyoto. / Exciton dynamics at the heteromolecular interface between N,N′-dioctyl-3,4,9,10-perylenedicarboximide and quaterrylene, studied using time-resolved photoluminescence. In: AIP Advances. 2014 ; Vol. 4, No. 6.
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abstract = "To elucidate the exciton dynamics at the heteromolecular interface, the temperature dependence of time-resolved photoluminescence (TRPL) spectra of neat-N,N′-dioctyl-3,4,9,10-perylenedicarboximide (PTCDI-C8) and PTCDI-C8/Quaterrylene (QT) heteromolecular thin films was investigated. The lifetimes of excitons were evaluated to identify the Frenkel (FE), high energy charge-transfer (CTEhigh), low energy charge-transfer (CTElow), and excimer exciton states. The thermal activation energy (Δact) of CTElow in PTCDI-C 8 thin film was evaluated as 25 meV, which is 1/5 of that of FE, indicating that CTElow is more thermally sensitive than FE in PTCDI-C8 thin film. We investigated the exciton transport length (l) along the vertical direction against the substrate surface in PTCDI-C 8/QT thin film at 30 K, and demonstrated that lFE = 9.9 nm, lCTElow = 4.2 nm, lCTEhigh = 4.3 nm, and l excimer = 11.9 nm. To elucidate the difference in l among these excitons, the activation energies (Ea) for quenching at the heteromolecular interface were investigated. Ea values were estimated to be 13.1 meV for CTElow and 18.6 meV for CTEhigh. These values agree with the thermal sensitivity of CTEs as reported in a previous static PL study. This latter situation is different from the case of FE and excimer excitons, which are transported via a resonant process and have no temperature dependence. The small Ea values of CTEs suggest that exciton transport takes place via a thermal hopping process in CTEs. The present experimental study provides information on nano-scaled exciton dynamics in a well-defined PTCDI-C8 (2 ML)/QT (2 ML) system.",
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AU - Morimoto, Kenta

AU - Hayakawa, Ryoma

AU - Wakayama, Yutaka

AU - Mori, Tatsuo

AU - Matsuishi, Kiyoto

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