Abstract
The studies on high-level excited states of an ion and electronic transition between different levels, either with theoretical or experimental methods, will help reveal the mechanism of luminescence, which is also a prerequisite for development of novel high efficiency phosphors. In this paper, Bi3+, Eu3+ and/or Tb3+ co-doped YBO3 phosphors were synthesized by the oxalate deposition assisted solid state reaction method, and their spectroscopic properties were investigated using a synchrotron radiation instrument with an emphasis on excitation, electronic transition and energy transfer from Bi3+ to Eu3+/Tb3+. Different phenomena between YBO3 : Bi3+,Eu3+ and YBO3 : Bi3+,Tb3+ luminescence were observed. That is, the residual emission of Bi3+ only occurs in the Bi3+ and Eu3+ co-doped system but not in the YBO3 : Bi3+,Tb3+ system. These phenomena are apparently caused by the differences in the energy transfer between Bi3+ → Eu3+ and Bi3+ → Tb3+, which hide the substantial differences between the interaction of Bi3+ and Eu3+/Tb3+ and the energy level match (spectra overlap). The physical mechanism involved in them is discussed.
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