Abstract
The luminescence e properit4se of ytterbium ions in strongtium haloborates were studied under optical, x-ray and synchrotron excitation. The emission spectra of Sr<SUB>2(1-x</SUB>)Yb<SUB>5</SUB>O<SUB>9</SUB>R consists of a blue and a UV band. The former is due to 4f<SUP>13</SUP>5d yields 4f<SUP>14</SUP> transtions on the Yb<SUP>2+</SUP> ions. The latter is tentatively assigned to charge transfer luminescence of Yb<SUP>3+</SUP> ions. The influence of the structural features of Sr<SUB>2</SUB>B<SUB>5</SUB>O<SUB>9</SUB>R and some preparative conditions on the luminescent behavior of Yb ions is discussed.
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