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Issue 9, 2012
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Controllable white upconversion luminescence in Ho3+/Tm3+/Yb3+ co-doped CaMoO4

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Abstract

The polycrystalline Ho3+/Tm3+/Yb3+ co-doped CaMoO4 phosphors were successfully synthesized by complex citrate-gel method. Under the laser excitation of 980 nm, Ho3+/Tm3+/Yb3+ co-doped CaMoO4 shows the bright white upconversion (UC) emission visible to the naked eye, which is composed of a blue emission at 475 nm from Tm3+, and green and red emissions at 543 nm and 651 nm from Ho3+. The coordinates of Ho3+/Tm3+/Yb3+ co-doped CaMoO4 in the commission international de'eclairage (CIE) chromaticity diagram can be controlled from a cool to a warm white color depending on the Tm3+ and Ho3+ concentrations. In Ho3+/Tm3+/Yb3+ co-doped CaMoO4, the UC luminescent properties on Tm3+ and Ho3+ concentrations and mechanism based on laser pump power were discussed in detail.

Graphical abstract: Controllable white upconversion luminescence in Ho3+/Tm3+/Yb3+ co-doped CaMoO4

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Publication details

The article was received on 20 Oct 2011, accepted on 12 Dec 2011 and first published on 25 Jan 2012


Article type: Paper
DOI: 10.1039/C2JM15332G
Citation: J. Mater. Chem., 2012,22, 3997-4002
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    Controllable white upconversion luminescence in Ho3+/Tm3+/Yb3+ co-doped CaMoO4

    J. H. Chung, J. H. Ryu, S. W. Mhin, K. M. Kim and K. B. Shim, J. Mater. Chem., 2012, 22, 3997
    DOI: 10.1039/C2JM15332G

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