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Titel: Spectroscopic properties and upconversion mechanisms in Er3+-doped fluoroindate glasses
Verfasser: Catunda, T.
Nunes, Luis A. O.
Flórez, A.
Messaddeq, Younes
Aegerter, Michel A.
Sprache: Englisch
Erscheinungsjahr: 1996
Quelle: Physical review / B. - 53. 1996, 10, S. 6065-6070
SWD-Schlagwörter: Fluoride
Stokes-Problem
Lumineszenz
Absorption
DDC-Sachgruppe: 620 Ingenieurwissenschaften und Maschinenbau
Dokumentart : Journalartikel
Kurzfassung: Fluorindate glasses containing 1,2,3,4 ErF3 mol % were prepared in a dry box under argon atmosphere. Absorption, Stokes luminescence (under visible and infrared excitation), the dependence of 4S3/2, 4I11/2, and 4I13/2 lifetimes with Er concentration, and upconversion under Ti-saphire laser excitation at λ=790 nm were measured, mostly at T=77 and 300 K. The upconversion results in a strong green emission and weaker blue and red emissions whose intensity obeys a power-law behavior I~Pn, where P is the infrared excitation power and n=1.6, 2.1, and 2.9 for the red, green, and blue emissions, respectively. The red emission exponent n=1.5 can be explained by a cross relaxation process. The green and blue emissions are due to excited state absorption (ESA) and energy transfer (ET) processes that predict a factor n=2 and n=3 for the green and blue emissions, respectively. From transient measurements we concluded that for lightly doped samples the green upconverted emission is originated due to both processes ESA and ET. However, for heavily doped samples ET is the dominant process.
Link zu diesem Datensatz: urn:nbn:de:bsz:291-scidok-24766
hdl:20.500.11880/24292
http://dx.doi.org/10.22028/D291-24236
SciDok-Publikation: 30-Nov-2009
Fakultät: Sonstige Einrichtungen
Fachrichtung: SE - INM Leibniz-Institut für Neue Materialien
Fakultät / Institution:INM
SE - Sonstige Einrichtungen

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