Effects of Diffusion on Energy Transfer by Resonance

Yokota, Masaharu; Tanimoto, Osamu

doi:10.1143/jpsj.22.779

Cited by 718 publications

(215 citation statements)

References 4 publications

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“…1 and 3) is dominated by singlet dynamics, and hence is only weakly dependent on temperature. Now, the singlet-triplet annihilation rate is [18,24]:…”

Section: Temperatures Below the Transition (Ie T < T Trans ) Multimentioning

confidence: 99%

Temperature dependence of the exciton dynamics inDCM2:Alq3

2014

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We study the temperature dependence of the triplet and singlet exciton dynamics in the archetype small molecule fluorescent guest-host system, tris(8-hydroxyquinolinato) aluminum (Alq 3 ) doped with 4-(dicyanomethylene)-2-methyl-6-julolidyl-9-enyl-4H-pyran (DCM2). We develop a comprehensive model of the exciton dynamics, and use it to fit the transient photoluminescence under different pulsed optical pumping in the temperature range of 80 K< T< 295 K. The triplet decay has a significantly different temperature dependence than that of singlets. From 295K to 80K, the triplet-triplet annihilation (TTA) rate decreases by two orders of magnitude, whereas the singlet-triplet annihilation rate decreases by <50% primarily a result of the different energy transfer mechanisms of singlets and triplets. The temperature dependence of TTA rate reveals two regimes separated by a transition at 180K from Marcus to MillerAbrahams transfer. This work deepens our understanding of exciton dynamics and energy transfer in small molecule organic materials.2

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“…1 and 3) is dominated by singlet dynamics, and hence is only weakly dependent on temperature. Now, the singlet-triplet annihilation rate is [18,24]:…”

Section: Temperatures Below the Transition (Ie T < T Trans ) Multimentioning

confidence: 99%

Temperature dependence of the exciton dynamics inDCM2:Alq3

2014

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“…where rn is the decay time due to migration, an expression for rD1 for the case of dipolar donor-acceptor interaction has been derived [27]: r$ = 11.404 NaC'/4D3/4…”

Section: Euomentioning

confidence: 99%

Energy transfer between Eu3+ ions in a lattice with two different crystallographic sites: Y2O3:Eu3+, Gd2O3:Eu3+ and Eu2O3

Buijs

Meyerink

Blasse

1987

Journal of Luminescence

287

175

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The Eu3+ ion occupies two different crystallographic sites in (Yr _XEu,),03 and (Gdt_ XEu,),03, with site symmetry S, and C,. Energy transfer over more than 7 A occurs from Eu3+ (S,) ions to Eu3+ (C,) ions. This is shown to be a direct one-phonon assisted process, in combination with a one-site resonant two-phonon assisted process at higher temperatures. For x = 1 there is energy migration over the Eu 3+ (C,) sublattice to quenching impurities. The presence of cooperative absorption points to superexchange interaction between the Eu3+ ions.

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“…При обменном тушении статическая и стационарная стадии фактически не стыкуются между собой, и описание кинетики всего процесса можно получить, только решив уравнение (4.3). В принципе это справедливо и в отношении мультипольного тушения 60 , 65 . Но чем более дальнодействую-щим оно является, тем труднее разделить процесс на последовательные ста-дии.…”

Section: диффузионное тушениеunclassified

Concentration quenching of noncoherent excitation in solutions

Burshteǐn¹

1984

Uspekhi Fizicheskikh Nauk

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Effects of Diffusion on Energy Transfer by Resonance

Cited by 718 publications

References 4 publications

Temperature dependence of the exciton dynamics inDCM2:Alq3

Temperature dependence of the exciton dynamics inDCM2:Alq3

Energy transfer between Eu3+ ions in a lattice with two different crystallographic sites: Y2O3:Eu3+, Gd2O3:Eu3+ and Eu2O3

Concentration quenching of noncoherent excitation in solutions

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