Efficient oxide phosphors for light upconversion; green emission from Yb3+ and Ho3+ co-doped Ln2BaZnO5 (Ln = Y, Gd)
Curry, RJ, Etchart, I, Hernandez, I, Huignard, A, Berard, M, Gillin, WP and Cheetham, AK (2011) Efficient oxide phosphors for light upconversion; green emission from Yb3+ and Ho3+ co-doped Ln2BaZnO5 (Ln = Y, Gd) Journal of Materials Chemistry, 21 (5). pp. 1387-1394.
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The optical properties of Yb3+ and Ho3+ co-doped Y2BaZnO5, synthesized by solid-state reactions, are investigated in detail. Under 977 nm excitation (~25 x 10-3 W mm-2), bright green upconversion emission is observed. Concentration dependence studies at room temperature show that relatively high infrared to visible upconversion efficiencies are obtained with values up to ~2.6%. The results of power dependence studies and temperature-dependent lifetime measurements allow us to determine the dominant upconversion mechanisms in Yb3+:Ho3+ co-doped Y2BaZnO5 oxides. The materials presented in this article constitute new and efficient upconversion phosphors which may find utility in a variety of applications.
|Divisions :||Faculty of Engineering and Physical Sciences > Electronic Engineering > Advanced Technology Institute > Nano-Electronics Centre|
|Date :||1 January 2011|
|Identification Number :||10.1039/c0jm01652g|
|Depositing User :||Symplectic Elements|
|Date Deposited :||15 Sep 2011 10:55|
|Last Modified :||23 Sep 2013 18:44|
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