Resonant Electronic Energy Transfer from Excitons Confined in Silicon Nanocrystals to Oxygen Molecules

Ковалев, Д. И.; Groß, E.; Künzner, N.; Koch, F.; Timoshenko, V.Yu.; Fujii, Minoru

doi:10.1103/physrevlett.89.137401

Cited by 139 publications

(96 citation statements)

References 8 publications

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“…An important property of micro-PS lies in the fact that upon photoexcitation of silicon nancrystals excitons are generated at rather high concentrations (the quantum yield of exciton photoluminescence reaches a few percent (Bisi et al, 2000)). It has been demonstrated that the energy can be effectively transferred from excitons to 3 O 2 molecules adsorbed on the surface of silicon nanocrystals with the subsequent transformation of these molecules into an excited state (Gross et al, 2003;Kovalev et al, 2002). Therein lies the essence of the mechanism of photosensitization of molecular oxygen.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, it has been revealed that photoexcitation of nanocrystals in microporous silicon (micro-PS) layers leads to the generation of singlet oxygen on the surface of the samples (Kovalev et al, 2002). It is known that the ground state of the oxygen molecule is represented by the triplet state ( 3 O 2 , where the superscript indicates the spin multiplicity; the total spin of the triplet molecule is S TO = 1).…”

Section: Introductionmentioning

confidence: 99%

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Photoelectron and Photosensitization Properties of Silicon Nanocrystal Ensembles

Konstantinova¹,

Демин²,

Кашкаров³

2011

Nanocrystal

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photoelectron and Photosensitization Properties of Silicon Nanocrystal Ensembles

Konstantinova¹,

Демин²,

Кашкаров³

2011

Nanocrystal

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“…Получено аналитическое выражение и дана численная оценка вероятности переноса энергии от нанопористого кремния к молекуле кислорода. Показано, что ее численное значение порядка 10 Недавние исследования показали перспективность нанопористого кремния (np-Si) для задач микро-и оптоэлектроники [1], а также для задач биологии и медицины [2,3]. Как следует из ряда работ [2,4,5], в присутствии возбужденного нанопористого кремния возможна генера-ция синглетного кислорода.…”

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“…Показано, что ее численное значение порядка 10 Недавние исследования показали перспективность нанопористого кремния (np-Si) для задач микро-и оптоэлектроники [1], а также для задач биологии и медицины [2,3]. Как следует из ряда работ [2,4,5], в присутствии возбужденного нанопористого кремния возможна генера-ция синглетного кислорода. Это было показано как с помощью прямого измерения люминесценции [4], так и косвенно (на основе биологическо-го действия синглетного кислорода) [5].…”

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Механизм Генерации Синглетного Кислорода В Присутствии Возбужденного Нанопористого Кремния

Самосват¹,

Чикалова-Лузина²,

Хромов³

et al. 2018

Письма В Журнал Технической Физики

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A theoretical analysis of the mechanism of generation of singlet oxygen in the presence of photoexcited nanoporous silicon is presented. It is demonstrated that the mechanism of generation of singlet oxygen is based on nonradiative energy transfer from nanoporous silicon to an oxygen molecule by the exchange mechanism. An analytical expression of the probability of energy transfer from nanoporous silicon to an oxygen molecule is obtained, and a numerical estimate of this process is given. The numerical estimation is of the order of 10^3–10^4 s^–1, a value that agrees rather well with the experiment.

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“…Then, it is difficult to realize the light emitting devices based on the Si nanocrystal assemblies. It is demonstrated that Si nanocrystals used as efficient photosensitizer for rare earth ions (5)- (6), molecular oxygen (7). Particularly, in the photosensitized effect for the molecular oxygen, the long lifetime of Si nanocrystals is an important role since the decay time of excitons is smaller than the transfer time of electronic excitation energy to molecular oxygen.…”

Section: Introductionmentioning

confidence: 99%

Resonant Energy Transfer from Porous Silicon to Iodine Molecules

Nakamura¹,

Ogawa²,

Kubota³

et al. 2008

ECS Trans.

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The electronic excitation energy transfer between excitons in porous silicon and iodine molecules in an organic solution is studied. From the time-resolved photoluminescence the rate of the energy transfer is increased with approaching a wavelength region where the photoluminescence spectrum of porous silicon overlaps the absorption spectrum of iodine molecules, and with increasing the radiative recombination rate of porous silicon. We show that the dependence of the rate is well explained by Förster type dipoledipole interaction mechanism in which the diffusion of the assemblies and molecules is taken into consideration. Furthermore, it is found that the efficiency of the energy transfer strongly depends on the emission wavelength at low iodine concentration. IntroductionSilicon (Si) nanocrystal is a promising material for opt-electronic devices because of their strong visible and near infrared photoluminescence (PL) at room temperature. The efficient luminescence is due to the recombination of quantum confined excitons (1)-(3). The typical system that contains luminescent Si nanocrystal assemblies is porous Si. Because Porous Si is easily prepared by the anodic electrochemical etching in a hydrofluoric acid based solution and has high luminescent efficiency, the structural and optical properties of porous Si are intensively investigated (4).The radiative lifetime of Si nanocrystals is rather long (~ µs range) because of the inheritance of indirect bandgap nature of bulk Si. Then, it is difficult to realize the light emitting devices based on the Si nanocrystal assemblies. It is demonstrated that Si nanocrystals used as efficient photosensitizer for rare earth ions (5)-(6), molecular oxygen (7). Particularly, in the photosensitized effect for the molecular oxygen, the long lifetime of Si nanocrystals is an important role since the decay time of excitons is smaller than the transfer time of electronic excitation energy to molecular oxygen. Additionally the large surface area in porous Si is an advantage for the energy transfer.Si nanocrystals can be used as the photosensitizer for other materials such as organic molecules. Recently, the energy transfer from Si nanocrystals to organic molecules is demonstrated (8). In that work, the energy transfer takes place via the direct electron exchange interaction, Dexter process, which is the same mechanism as that between Si nanocrystals and molecular oxygen. Basically, the electronic excitation energy of donor can non-radiatively transfer to acceptor via the dipole-dipole Columbic interaction, Förster process (9), in addition to Dexter process. In colloidal semiconductor nanocrystals such as CdSe quantum dots, the excitation energy transfer to organic dye molecules or nearby quantum dots via Förster process is observed (10)-(11). Then, Si nanocrystals also expect for use of the energy donor in Förster type energy transfer. It is important to investigate Förster process in Si nanocrystals, because Si nanocrystals have a longer lifetime compared to direct bangap semicondu...

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Resonant Electronic Energy Transfer from Excitons Confined in Silicon Nanocrystals to Oxygen Molecules

Cited by 139 publications

References 8 publications

Photoelectron and Photosensitization Properties of Silicon Nanocrystal Ensembles

Photoelectron and Photosensitization Properties of Silicon Nanocrystal Ensembles

Механизм Генерации Синглетного Кислорода В Присутствии Возбужденного Нанопористого Кремния

Resonant Energy Transfer from Porous Silicon to Iodine Molecules

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