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Photoluminescence and up-conversion of Er3+ in tetragonal NaBi(XO4)2, X=Mo or W, scheelites

AutorRico, Mauricio ; Volkov, Vladimir; Zaldo, Carlos
Palabras claveLuminescence
Optical properties
Disordered systems
Fecha de publicación12-jul-2001
CitaciónJournal of Alloys and Compounds 323-324, 806-810 (2001)
ResumenEr doped NaBi(XO4)2, X=Mo or W, single crystals with tetragonal structure have been grown with optical quality by the Czochralski method. Er concentrations up to 1.4×1020 cm−3 and 1.3×1020 cm−3 have been attained in Mo and W compounds respectively. 4S3/2→4I15/2 emission of Er3+ has been achieved at room temperature by up-conversion exciting the 4I11/2 or 4I9/2 multiplets. This green emission is strongly polarised parallel to the crystallographic c-axis. The efficiency of the up-conversion process in tetragonal NaBi(MoO4)2 and NaBi(WO4)2 crystals are similar and also similar to that found in monoclinic KGd(WO4)2 crystal. The slope of the logarithmic dependence between up-converted and pump intensities suggests a two-photon excitation process. A schematic model of the up-conversion process is outlined.
Versión del editorhttp://dx.doi.org/10.1016/S0925-8388(01)01149-5
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