Abstract
Tb3+, Eu3+ singly doped and Tb3+-Eu3+ co-doped Ba2GdF7 nanoparticles were obtained by one-step hydrothermal process. Under 273 or 368 nm ultraviolet (UV) excitation, by changing the ratio of Tb3+ and Eu3+, the emission color of Ba2GdF7: Tb3+, Eu3+ are manipulated from green to yellow, orange and red based on energy transfer (ET) from Gd3+ to Tb3+, Eu3+ and from Tb3+ to Eu3+. The ET mechanism among Tb3+ and Eu3+ was determined as dipole-dipole interaction by the lifetime change of Tb3+. The thermal stability of Ba2GdF7: 40%Tb3+, 3%Eu3+ phosphor was studied and the activation energy was calculated to be 0.289 eV at 273 nm and 0.297 eV at 368 nm excitation. The multi-color emitting Ba2GdF7: Tb3+, Eu3+ nanophosphors might have a promising application in phosphors-converted light-emitting diodes.
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