Wydział Chemii

Jerzy Sokolnicki

2010

Journal of Physics-Condensed Matter

22

275301/1-275301/8

10.1088/0953-8984/22/27/275301

Naukowa

Angielski

Artykuł

Nanocrystalline lutetium pyrosilicate Lu2Si2O7(LPS) doped with Tb3+(LPS:Tb) or Ce3+/Tb3+(LPS:Ce, Tb) was obtained at 1250◦C by the reaction of nanostructured Lu2O3and colloidalSiO2. X-ray diffraction analysis confirmed the crystallization of a single phase of LPS at theindicated temperature. Different concentrations of active ions allowed us to study the influenceof Ce3+co-doping on Tb3+emission. Tb3+-doped LPS yields both the blue emission5D3→7FJ(J=3, 4, 5, 6) and the green emission5D4→7FJ(J=3, 4, 5, 6) of Tb3+.Thegreen emission of Tb3+is enhanced remarkably in both the cathodoluminescence andphotoluminescence spectra because of energy transfer from Ce3+to Tb3+ions, both of whichare present in the host lattice. Based on the optical luminescence and luminescence excitationspectra, the optimal Tb3+doping level for maximum light output was established to be 9 mol%and the highest enhancement of Tb3+luminescence by Ce3+co-doping was detected using a1:3 ratio of Ce3+/Tb3+concentration. Two different crystallographic sites of Tb3+in the LPSlattice were detected in the luminescence and excitation spectra of samples with higher Tb3+concentrations (6–9 mol%). The single-exponential decay profile of5D4emission for the lessconcentrated samples and the double-exponential decay for the higher doping level are inagreement with this observation. Calculation of colour coordinates shows thatLPS:Ce(0.25%)Tb(3%) emits white light

http://dx.doi.org/10.1088/0953-8984/22/27/275301

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