Publication detail

Near-field study of hot luminescence centers in ZnS:Mn nanocrystals

GRMELA, L. TOMÁNEK, P.

Original Title

Near-field study of hot luminescence centers in ZnS:Mn nanocrystals

Czech Title

Studie horkých luminiscenčních center v ZnS:Mn nanokrystalech pomocí optického blízkého pole

English Title

Near-field study of hot luminescence centers in ZnS:Mn nanocrystals

Type

abstract

Language

en

Original Abstract

The optical properties of impurities within nanocrystals embedded in glass or polymer matrix have been examined, and in particular of Mn2 in ZnS nanocrystals. Therefore we have provided a measurement in the optical near-field of local spatial distribution of luminescence by using SNOM microscope at emission peaks of materials at 585-595 nm, which is due to the luminescence of Mn2 in ZnS. The time-resolved emission spectra in nanocrystals exhibit a quite long decay time (order of microseconds rather than sub-nanoseconds for a bulk material), caused by the formation of hot spot centers. The slow relaxation of excited vibrational modes in nanocrystals could have a significant impact on possible future applications in large-area illumination devices and other nanoparticle device applications.

Czech abstract

Článek přináší měření v optickém blízkém poli prostorového rozložení luminiscenčních horkých center Mn2+ v ZnS. Dále bylo měřen doznívání emisních spekter v nanokrystalech, které je podstatně delší než v objemovém materiálu, což je právě způsobeno tvorbou horkých center. Pomalá relaxace excitovaných vibračních módů může mít značný dopad na možné budoucí aplikace luminoforů např.ve zkvalitnění a delší zivotnosti velkoplošných osvětlovacích zařízeních.

English abstract

The optical properties of impurities within nanocrystals embedded in glass or polymer matrix have been examined, and in particular of Mn2 in ZnS nanocrystals. Therefore we have provided a measurement in the optical near-field of local spatial distribution of luminescence by using SNOM microscope at emission peaks of materials at 585-595 nm, which is due to the luminescence of Mn2 in ZnS. The time-resolved emission spectra in nanocrystals exhibit a quite long decay time (order of microseconds rather than sub-nanoseconds for a bulk material), caused by the formation of hot spot centers. The slow relaxation of excited vibrational modes in nanocrystals could have a significant impact on possible future applications in large-area illumination devices and other nanoparticle device applications.

Keywords

ZnS:Mn nanocrystals, hot luminescence center, optical near-field, scanning microscopy, time-resolved spectra

Released

26.06.2007

Publisher

VUTIUM Brno

Location

Brno

Pages from

158

Pages to

158

Pages count

1

BibTex


@misc{BUT60535,
  author="Lubomír {Grmela} and Pavel {Tománek}",
  title="Near-field study of hot luminescence centers in ZnS:Mn nanocrystals",
  annote="The optical properties of impurities within  nanocrystals embedded in glass or polymer matrix have been examined, and in particular of Mn2 in ZnS nanocrystals.
 Therefore we have provided a measurement in the optical near-field of local spatial distribution of luminescence by using SNOM microscope at emission peaks of materials at 585-595 nm, which is due to the luminescence of Mn2 in ZnS.
  The time-resolved emission spectra in nanocrystals exhibit a quite long decay time (order of microseconds rather than sub-nanoseconds for a bulk material), caused by the formation of   hot spot centers.  The slow relaxation of excited vibrational modes in nanocrystals could have a significant impact on possible future applications in large-area illumination devices and other nanoparticle device applications.",
  address="VUTIUM Brno",
  chapter="60535",
  institution="VUTIUM Brno",
  year="2007",
  month="june",
  pages="158--158",
  publisher="VUTIUM Brno",
  type="abstract"
}