Abstract
In this paper, Lu3+ ions (<10at.%) were doped into Ba2SiO4:Eu2+ phosphors by the high temperature solid-state reaction. The effects of Lu3+ ions on the structure and photoluminescent properties were investigated in detail. Photoluminescence spectra indicate that no energy transfer between Lu3+ ions and Eu2+ ions, while Eu2+ green luminescence intensity increases with Lu3+ dopant concentration increasing. The increasing in Eu2+/Eu3+ amount ratio is proved by luminescence spectra, thermoluminescence spectra, X-ray photoelectron spectroscopy and Electron Spin Resonance spectra. Then the underlying mechanism, as Lu3+ ions dopant improving the conversion of Eu3+→Eu2+, is identified. The Ba2SO4 crystal structure rigidity is increased by Lu3+ ion dopant, which is determined from Debye temperature (ΘD) analysis. This would promote Eu3+ to be Eu2+ in. The work gives a reasonable explanation for luminescence improvement in Ba2SiO4:Eu2+ phosphor with Lu3+ dopant.
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