Transient charge trapping in Eu3+-doped nanocomposites by ultrafast laser excitation

Huimin Liu, Sergie Lysenko, Jose Jimenez, Valentin Vikhnin

Research output: Contribution to journalArticle

Abstract

Eu3+ was incorporated as probe ions into nanocomposite glasses, such as metal silver doped phosphate glass and crystalline nanocomposites Sienriched SiO2 glass. Luminescence studies show that the doped europium ions are present as trivalent Eu3+, and are distributed in the matrix on the boundary surface of nanoparticles. The valence switching from Eu3+ to Eu2+ was observed in Si-SiO2 nanocomposites when ultrafast laser excitation was applied. In silver metal nanoparticles embedded alummophosphate glass, a time-resolved ultrafast degenerate-four-wave-mixing (DFWM) experiment shows enhanced third-order nonlinearity at zero-delay time, followed by a bell-like signal buildup. It is attributed to the creation of electronic polaron and vibronic Wannier-Mott exciton (WME). In europium codoped sample, however, the bell-like signal is depressed. All the above observations are interpreted as the result of a strong Coulomb interaction between conduction electrons produced inside the nanoparticles by laser excitation and Eu3+ ions residing near the boundary surface. The trivalent europium ions play the role as positive charges attracting electrons. This results in temporary formation of Eu2+, and blocks the resonant tunneling transition in the silver-glass system to avoid creating large radius polaron.

Original languageEnglish (US)
Pages (from-to)663-667
Number of pages5
JournalJournal of Rare Earths
Volume24
Issue number6
DOIs
StatePublished - Dec 2006

Fingerprint

Ultrafast lasers
Charge trapping
Laser excitation
trapping
Nanocomposites
Europium
europium
laser
glass
Glass
Silver
Ions
Gene Conversion
silver
ion
Nanoparticles
Resonant tunneling
electron
Electrons
Four wave mixing

Keywords

  • Europium
  • Excitation
  • Nanocomposite
  • Rare earths
  • Ultrafast

ASJC Scopus subject areas

  • Chemistry(all)
  • Geochemistry and Petrology

Cite this

Transient charge trapping in Eu3+-doped nanocomposites by ultrafast laser excitation. / Liu, Huimin; Lysenko, Sergie; Jimenez, Jose; Vikhnin, Valentin.

In: Journal of Rare Earths, Vol. 24, No. 6, 12.2006, p. 663-667.

Research output: Contribution to journalArticle

Liu, Huimin ; Lysenko, Sergie ; Jimenez, Jose ; Vikhnin, Valentin. / Transient charge trapping in Eu3+-doped nanocomposites by ultrafast laser excitation. In: Journal of Rare Earths. 2006 ; Vol. 24, No. 6. pp. 663-667.
@article{1b9c008e70d444c58bacab6ed60b6fc2,
title = "Transient charge trapping in Eu3+-doped nanocomposites by ultrafast laser excitation",
abstract = "Eu3+ was incorporated as probe ions into nanocomposite glasses, such as metal silver doped phosphate glass and crystalline nanocomposites Sienriched SiO2 glass. Luminescence studies show that the doped europium ions are present as trivalent Eu3+, and are distributed in the matrix on the boundary surface of nanoparticles. The valence switching from Eu3+ to Eu2+ was observed in Si-SiO2 nanocomposites when ultrafast laser excitation was applied. In silver metal nanoparticles embedded alummophosphate glass, a time-resolved ultrafast degenerate-four-wave-mixing (DFWM) experiment shows enhanced third-order nonlinearity at zero-delay time, followed by a bell-like signal buildup. It is attributed to the creation of electronic polaron and vibronic Wannier-Mott exciton (WME). In europium codoped sample, however, the bell-like signal is depressed. All the above observations are interpreted as the result of a strong Coulomb interaction between conduction electrons produced inside the nanoparticles by laser excitation and Eu3+ ions residing near the boundary surface. The trivalent europium ions play the role as positive charges attracting electrons. This results in temporary formation of Eu2+, and blocks the resonant tunneling transition in the silver-glass system to avoid creating large radius polaron.",
keywords = "Europium, Excitation, Nanocomposite, Rare earths, Ultrafast",
author = "Huimin Liu and Sergie Lysenko and Jose Jimenez and Valentin Vikhnin",
year = "2006",
month = "12",
doi = "10.1016/S1002-0721(07)60005-2",
language = "English (US)",
volume = "24",
pages = "663--667",
journal = "Journal of Rare Earths",
issn = "1002-0721",
publisher = "Chinese Rare Earth Society",
number = "6",

}

TY - JOUR

T1 - Transient charge trapping in Eu3+-doped nanocomposites by ultrafast laser excitation

AU - Liu, Huimin

AU - Lysenko, Sergie

AU - Jimenez, Jose

AU - Vikhnin, Valentin

PY - 2006/12

Y1 - 2006/12

N2 - Eu3+ was incorporated as probe ions into nanocomposite glasses, such as metal silver doped phosphate glass and crystalline nanocomposites Sienriched SiO2 glass. Luminescence studies show that the doped europium ions are present as trivalent Eu3+, and are distributed in the matrix on the boundary surface of nanoparticles. The valence switching from Eu3+ to Eu2+ was observed in Si-SiO2 nanocomposites when ultrafast laser excitation was applied. In silver metal nanoparticles embedded alummophosphate glass, a time-resolved ultrafast degenerate-four-wave-mixing (DFWM) experiment shows enhanced third-order nonlinearity at zero-delay time, followed by a bell-like signal buildup. It is attributed to the creation of electronic polaron and vibronic Wannier-Mott exciton (WME). In europium codoped sample, however, the bell-like signal is depressed. All the above observations are interpreted as the result of a strong Coulomb interaction between conduction electrons produced inside the nanoparticles by laser excitation and Eu3+ ions residing near the boundary surface. The trivalent europium ions play the role as positive charges attracting electrons. This results in temporary formation of Eu2+, and blocks the resonant tunneling transition in the silver-glass system to avoid creating large radius polaron.

AB - Eu3+ was incorporated as probe ions into nanocomposite glasses, such as metal silver doped phosphate glass and crystalline nanocomposites Sienriched SiO2 glass. Luminescence studies show that the doped europium ions are present as trivalent Eu3+, and are distributed in the matrix on the boundary surface of nanoparticles. The valence switching from Eu3+ to Eu2+ was observed in Si-SiO2 nanocomposites when ultrafast laser excitation was applied. In silver metal nanoparticles embedded alummophosphate glass, a time-resolved ultrafast degenerate-four-wave-mixing (DFWM) experiment shows enhanced third-order nonlinearity at zero-delay time, followed by a bell-like signal buildup. It is attributed to the creation of electronic polaron and vibronic Wannier-Mott exciton (WME). In europium codoped sample, however, the bell-like signal is depressed. All the above observations are interpreted as the result of a strong Coulomb interaction between conduction electrons produced inside the nanoparticles by laser excitation and Eu3+ ions residing near the boundary surface. The trivalent europium ions play the role as positive charges attracting electrons. This results in temporary formation of Eu2+, and blocks the resonant tunneling transition in the silver-glass system to avoid creating large radius polaron.

KW - Europium

KW - Excitation

KW - Nanocomposite

KW - Rare earths

KW - Ultrafast

UR - http://www.scopus.com/inward/record.url?scp=33846915965&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33846915965&partnerID=8YFLogxK

U2 - 10.1016/S1002-0721(07)60005-2

DO - 10.1016/S1002-0721(07)60005-2

M3 - Article

AN - SCOPUS:33846915965

VL - 24

SP - 663

EP - 667

JO - Journal of Rare Earths

JF - Journal of Rare Earths

SN - 1002-0721

IS - 6

ER -