Luminescence from erbium-doped silicon nanocrystals in silica: Excitation mechanisms

Kenyon, Anthony J.; Chryssou, C.E.; Pitt, Christopher; Shimizu‐Iwayama, Tsutomu; Hole, D.E.; Sharma, Nikhil; Humphreys, C. J.

doi:10.1063/1.1419210

Cited by 177 publications

(105 citation statements)

References 33 publications

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“…We recall that such an initial amplitude of Er PL attained very shortly after excitation ͑regime I͒ was also reported before. 23 Based on the total evaluation of optically active Er fraction, we conclude that the "residual concentration" of Er 3+ ions involved in the slow excitation/slow recombination process ͑regimes II and III͒ amounts to ϳ0.2% of the total Er content.…”

Section: B High-resolution Photoluminescence Kineticsmentioning

confidence: 99%

Energy transfer in Er-dopedSiO2sensitized with Si nanocrystals

et al. 2008

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We present a high-resolution photoluminescence study of Er-doped SiO 2 sensitized with Si nanocrystals ͑Si NCs͒. Emission bands originating from recombination of excitons confined in Si NCs, internal transitions within the 4f-electron core of Er 3+ ions, and a band centered at Ϸ 1200 nm have been identified. Their kinetics were investigated in detail. Based on these measurements, we present a comprehensive model for energy-transfer mechanisms responsible for light generation in this system. A unique picture of energy flow between the two subsystems was developed, yielding truly microscopic information on the sensitization effect and its limitations. In particular, we show that most of the Er 3+ ions available in the system are participating in the energy exchange. The long-standing problem of apparent loss of optical activity in the majority of Er dopants upon sensitization with Si NCs is clarified and assigned to the appearance of a very efficient energy exchange mechanism between Si NCs and Er 3+ ions. Application potential of SiO 2 : Er, sensitized by Si NCs, was discussed in view of the newly acquired microscopic insight.

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Section: B High-resolution Photoluminescence Kineticsmentioning

confidence: 99%

Energy transfer in Er-dopedSiO2sensitized with Si nanocrystals

et al. 2008

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“…(1), we determine the effective cross section of the Si-nc mediated excitation as = 8.7± 0.3ϫ 10 −17 cm 2 , close to previous reports. 5,6 We note, that a similar value of can also be estimated from the general formula for excitation cross section of Er 3+ in crystalline Si. 13 The contribution from the Er 3+ ions directly excited in Sample No.…”

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confidence: 99%

Sensitization of Er luminescence by Si nanoclusters

et al. 2004

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“…For example, a number of studies have shown that the sensitized erbium luminescence in the SiO x system may be characterized by an effective excitation cross section ͑ ef f ͒ that takes into account absorption of pump photons by Si nanoclusters, followed by transfer of excitation to nearby erbium ions. [4][5][6][7][8][9] In this paper, we discuss the appropriateness of defining an effective cross section and suggest instead that a transfer coefficient is a more robust measure of sensitization.…”

Section: Introductionmentioning

confidence: 99%

Generalized rate-equation analysis of excitation exchange between silicon nanoclusters and erbium ions

et al. 2008

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We discuss the use of rate equations to analyze the sensitization of erbium luminescence by silicon nanoclusters. In applying the general form of second-order coupled rate-equations to the Si nanocluster-erbium system, we find that the photoluminescence dynamics cannot be described using a simple rate equation model. Both rise and fall times exhibit a stretched exponential behavior, which we propose arises from a combination of a strongly distance-dependent nanocluster-erbium interaction, along with the finite size distribution and indirect band gap of the silicon nanoclusters. Furthermore, the low fraction of erbium ions that can be excited nonresonantly is a result of the small number of ions coupled to nanoclusters.

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Luminescence from erbium-doped silicon nanocrystals in silica: Excitation mechanisms

Cited by 177 publications

References 33 publications

Energy transfer in Er-dopedSiO2sensitized with Si nanocrystals

Energy transfer in Er-dopedSiO2sensitized with Si nanocrystals

Sensitization of Er luminescence by Si nanoclusters

Generalized rate-equation analysis of excitation exchange between silicon nanoclusters and erbium ions

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