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Random lasing in ZnO nanocrystals

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Title: Random lasing in ZnO nanocrystals
Authors: Fallert, J. jfallert@aph.uni-karlsruhe.de, Dietz, R.J.B.1, Hauser, M.1, Stelzl, F.1, Klingshirn, C.1, Kalt, H.1
Source: Journal of Luminescence. Dec2009, Vol. 129 Issue 12, p1685-1688. 4p.
Subjects: Electronic excitation, Zinc oxide, Nanocrystals, Powder metallurgy, Scattering (Physics), Light sources, Luminescence, Nonlinear optics, Particle size distribution
Abstract: Abstract: Nanocrystalline ZnO powders can act as gain and scattering medium in a random laser where the light emission can be strongly amplified. In this work, we compare the luminescence properties of samples with different particle sizes in the regime of linear and nonlinear optics. In the high-excitation regime random lasing is observed in all samples. Here, the lasing threshold depends strongly on the size distribution in the ensemble. Additional characterization of the samples has been done by determining the absolute quantum efficiency of the radiative processes in the powder. The values are in the 10% range and the near-edge luminescence is strongly influenced by the particle sizes. We show that by annealing the nanocrystals coalesce to larger polycrystalline grains, which results in a new emission band at 3.333eV due to the grain boundaries. Furthermore, it is found that in the annealed samples the threshold for random lasing could be considerably decreased. [Copyright &y& Elsevier]
Copyright of Journal of Luminescence is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 44814978
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Label: Title
  Group: Ti
  Data: Random lasing in ZnO nanocrystals
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  Data: <searchLink fieldCode="AR" term="%22Fallert%2C+J%2E%22">Fallert, J.</searchLink><i> jfallert@aph.uni-karlsruhe.de</i><br /><searchLink fieldCode="AR" term="%22Dietz%2C+R%2EJ%2EB%2E%22">Dietz, R.J.B.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Hauser%2C+M%2E%22">Hauser, M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Stelzl%2C+F%2E%22">Stelzl, F.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Klingshirn%2C+C%2E%22">Klingshirn, C.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kalt%2C+H%2E%22">Kalt, H.</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Luminescence%22">Journal of Luminescence</searchLink>. Dec2009, Vol. 129 Issue 12, p1685-1688. 4p.
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  Data: <searchLink fieldCode="DE" term="%22Electronic+excitation%22">Electronic excitation</searchLink><br /><searchLink fieldCode="DE" term="%22Zinc+oxide%22">Zinc oxide</searchLink><br /><searchLink fieldCode="DE" term="%22Nanocrystals%22">Nanocrystals</searchLink><br /><searchLink fieldCode="DE" term="%22Powder+metallurgy%22">Powder metallurgy</searchLink><br /><searchLink fieldCode="DE" term="%22Scattering+%28Physics%29%22">Scattering (Physics)</searchLink><br /><searchLink fieldCode="DE" term="%22Light+sources%22">Light sources</searchLink><br /><searchLink fieldCode="DE" term="%22Luminescence%22">Luminescence</searchLink><br /><searchLink fieldCode="DE" term="%22Nonlinear+optics%22">Nonlinear optics</searchLink><br /><searchLink fieldCode="DE" term="%22Particle+size+distribution%22">Particle size distribution</searchLink>
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  Data: Abstract: Nanocrystalline ZnO powders can act as gain and scattering medium in a random laser where the light emission can be strongly amplified. In this work, we compare the luminescence properties of samples with different particle sizes in the regime of linear and nonlinear optics. In the high-excitation regime random lasing is observed in all samples. Here, the lasing threshold depends strongly on the size distribution in the ensemble. Additional characterization of the samples has been done by determining the absolute quantum efficiency of the radiative processes in the powder. The values are in the 10% range and the near-edge luminescence is strongly influenced by the particle sizes. We show that by annealing the nanocrystals coalesce to larger polycrystalline grains, which results in a new emission band at 3.333eV due to the grain boundaries. Furthermore, it is found that in the annealed samples the threshold for random lasing could be considerably decreased. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Luminescence is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.jlumin.2009.02.022
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      – Code: eng
        Text: English
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        PageCount: 4
        StartPage: 1685
    Subjects:
      – SubjectFull: Electronic excitation
        Type: general
      – SubjectFull: Zinc oxide
        Type: general
      – SubjectFull: Nanocrystals
        Type: general
      – SubjectFull: Powder metallurgy
        Type: general
      – SubjectFull: Scattering (Physics)
        Type: general
      – SubjectFull: Light sources
        Type: general
      – SubjectFull: Luminescence
        Type: general
      – SubjectFull: Nonlinear optics
        Type: general
      – SubjectFull: Particle size distribution
        Type: general
    Titles:
      – TitleFull: Random lasing in ZnO nanocrystals
        Type: main
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            NameFull: Fallert, J.
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            NameFull: Dietz, R.J.B.
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            NameFull: Hauser, M.
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            NameFull: Stelzl, F.
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            NameFull: Klingshirn, C.
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            – D: 01
              M: 12
              Text: Dec2009
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              Y: 2009
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              Value: 129
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              Value: 12
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