Abstract of Publication No. 511
Annina Aebischer, Stephan Heer, Daniel Biner, Karl Krämer, Markus Haase and Hans U. Güdel
Visible light emission upon near-infrared excitation in a transparent solution of
nanocrystalline b-NaGdF4: Yb3+, Er3+
Chem. Phys. Lett. 407, 124-128 (2005)
Abstract:
High quality nanocrystals of hexagonal b-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 10233 cm–1 (977 nm) with a
laser power density of 2 kW cm–2.
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13.12.11 by
Gabriela Frei 