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Elsevier, Journal of Alloys and Compounds, (603), p. 136-143

DOI: 10.1016/j.jallcom.2014.03.035

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Efficient monochromatic red, green, and blue up-converted luminescence from Yb3+-doped micro-phosphors co-doped with Er3+ or Tm3+ ions

Journal article published in 2014 by Congji Zha, Peter Osvath, Anton Launikonis, Andrew D. Scully
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

Yb3+-doped YVO4 and Y2O3 micro-phosphors co-doped with Tm3+ or Er3+ ions were prepared using a solid-state reaction method without the use of additional flux. Analysis of their crystalline properties indicates essentially complete inter-diffusion of the dopant ions into the host crystal with no evidence of impurity phases. The luminescence up-conversion properties of the micro-phosphors were investigated using 980 nm laser diode excitation. Blue up-converted luminescence centred at 474 nm associated with the 1G4 → 3H6 transition of Tm3+ is produced by the Tm3+/Yb3+ co-doped YVO4 phosphor, with an overall efficiency of luminescence up-conversion of 1.3%. The Er3+/Yb3+ co-doped YVO4 micro-phosphor produced two green up-converted luminescence emission bands centred at 526 nm and 554 nm corresponding to the 2H11/2 → 4I15/2 and 4S3/2 → 4I15/2 transitions of Er3+, respectively, with a total efficiency of up-converted luminescence of 6.6%. In contrast with the green-emitting Er3+/Yb3+ co-doped YVO4-based phosphor, Er3+/Yb3+ co-doped Y2O3 micro-phosphors were produced displaying almost exclusively intense red up-converted luminescence associated with the 4F9/2 → 4I15/2 transition of Er3+, with efficiencies of luminescence up-conversion up to 14%. Micro-phosphors were produced for which the blue, green and red up-converted luminescence in each case accounts for >94% of the total up-converted luminescence emission.