Abstract

The X-ray excited optical luminescence spectrum of Pr 3+ in YPO 4 was investigated. In addition to the sharp line f-f transitions involving the energy levels of the 4f 2 configuration of Pr 3+ ion, the spectrum contains some broad groups of fluorescence lines in the ultraviolet and blue region. These groups of fluorescence are attributed to transitions from the lowest 4f I5d state at 43050 cm -1 to the 4f 2 levels of the Pr 3+ion in YPO 4.

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