Preparation and Upconversion Luminescence of Y2SiO5:Yb3+, Ho3+ Nanophosphors
Authors: Guo, Linna; Wang, Yuhua; Peng, Lingling
Source: Journal of Nanoscience and Nanotechnology, Volume 11, Number 11, November 2011 , pp. 9588-9593(6)
Publisher: American Scientific Publishers
Abstract:X1 type monoclinic Y2SiO5:Yb3+, Ho3+ nanophosphors with fixed (varied) Ho3+ and varied (fixed) Yb3+ concentrations were synthesized by sol–gel method. The nanophosphors presented lacunaris shape with an average size of about 47 nm measured by transmission electron microscopy and scanning electron microscopy. Up-conversion emissions have been observed at 550 nm corresponding to (5F4, 5S2)–5I8 transition and 661 nm due to 5F5–5I8 transition of Ho3+ upon 980 nm excitation at room temperature. The results indicate that both green and red luminescences are based on the two-photon process through the energy transfer from Yb3+. However, the intensity of green emission is weaker than that of the red, because the 5I7 level of Ho3+ can be effectively populated. The integrated upconversion emission intensity on the Yb3+ and Ho3+ concentrations were also studied.
Document Type: Research Article
Publication date: November 1, 2011
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