Abstract
Powders of Y2O3 co-doped with Yb3+ and Er3+ composed of well-crystallized nanoparticles (30 to 50 nm in diameter) with no adsorbed ligand species on their surface are prepared by polymer complex solution method. These powders exhibit up-conversion emission upon 978-nm excitation with a color that can be tuned from green to red by changing the Yb3+/Er3+ concentration ratio. The mechanism underlying up-conversion color changes is presented along with material structural and optical properties.PACS42.70.-a, 78.55.Hx, 78.60.-b
Highlights
Up-conversion materials have the ability to convert lower energy near-infrared radiations into higher energy visible radiations
Vetrone et al showed that CO32− and OH− species are frequently adsorbed on the surface of sesquioxide nanoparticles [22]. Their high vibrational energies decrease the UC efficiency through multi-phonon relaxations. For this reason we applied polymer complex solution (PCS) synthesis [23] since we found earlier that the PCS method provides sesquioxides with low surface area and defects and no adsorbed species on the surface [24,25,26]
In this research we showed that color tuning from green to red can be achieved in Yb3+/Er3+ UC nanoparticle (UCNP) systems on account of changes of Yb3+ sensitizer concentration
Summary
Up-conversion materials have the ability to convert lower energy near-infrared radiations into higher energy visible radiations. These materials have gained considerable attention because of their use in a wide range of important applications, from solid compact laser devices operating in the visible region and infrared quantum counter detectors to three-dimensional displays, temperature sensors, solar cells, anti-counterfeiting, and biological fluorescence labels and probes [1,2,3,4,5,6]. Methods for UC nanoparticle (UCNP) synthesis are of particular interest for use in two-photon bio-imaging, sensitive luminescent bio-labels, and GaAs-coated highly efficient light-emitting diodes [7].
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