Visible light emission upon near-infrared excitation in a transparent solution of nanocrystalline beta-NaGdF4 : Yb3+, Er3+

Autor(en): Aebischer, A
Heer, S
Biner, D
Kramer, K
Haase, M 
Gudel, HU
Stichwörter: BLUE; Chemistry; Chemistry, Physical; CORE; GREEN; NANOPARTICLES; Physics; Physics, Atomic, Molecular & Chemical; QUANTUM DOTS; UP-CONVERSION EMISSION
Erscheinungsdatum: 2005
Herausgeber: ELSEVIER
Journal: CHEMICAL PHYSICS LETTERS
Volumen: 407
Ausgabe: 1-3
Startseite: 124
Seitenende: 128
Zusammenfassung: 
High quality nanocrystals of hexagonal beta-NaGdF4 codoped with Yb3+ and Er3+ were synthesized by controlled precipitation in high boiling organic solvents and characterized by XRD and TEM. The particles of roughly spherical shape and a size of about 30 nm can be transparently dissolved in DMSO. Visible by eye green and red upconversion emission is observed upon near-infrared excitation at 10 233 cm(-1) (977 nm) with a laser power density of 2 kW cm(-2). (c) 2005 Elsevier B.V. All rights reserved.
ISSN: 00092614
DOI: 10.1016/j.cplett.2005.03.053

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