Trivalent lanthanide ions show interesting properties due to the optical transitions within 4fⁿ- electronic mainfold. In luminescent material field, phosphors based on lanthanide ions play an important role because of sharp absorption and emission lines [1]. Nowadays, the three basic emission colors: blue, green and red are usually obtained with rare-earth materials. Eu(III) and Pr(III) ions exhibit intense red emission, Tb(III) ions show intense green emission. However, Dy(III) ions are known as two primary color phosphors. Luminescence spectra of Dy(III) present two characteristic bands at 480 nm (blue) and 575 nm (yellow) [2].

In the search for new luminescent materials we suggest to use tungstate as a host for lanthanide ions because of their specific energetic structure and optical properties of the WO₄^2- group which absorbs UV radiation and emits visible light [3,4].

In order to enhance the Ln(III) emission the energy transfer process can be achieved by using Gd₂(WO₄)₃. The luminescence properties of the phosphors were analyzed by means of emission and excitation spectra, including results of luminescence lifetimes of Ln(III) ions. Additionally, we used hydrostatic pressure applied in a diamond anvil cell (DAC) to change the interaction of localized electrons with the lattice and to change the energy of the localized states of Ln(III) with respect to the band edges [2].

Supported by the Ministry of Science and Information Techniques (Grant N R15 0029/2009)

References:

[1] C.R. Ronda, T. Jüstel, H. Nikol, J. Alloys and Compd. 275-277 (1998) 669.

[2] S. Mahlik, A. Lazarowska, B. Grobelna, M. Grinberg, J. Phys. Condens. Matter 24 (2012) 485501.

[3] B. Grobelna, J.Alloys and Compd. 440 (2007) 265.

[4] B. Grobelna, A. Synak, P. Bojarski, K. Szczodrowski, B. Kukliński, S. Raut, I. Gryczyński, Optical Materials 35 (2013) 456-461.  

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