Luminescence and site occupancy of ${Ce}^{3 +}$ in ${Ba}_{2} Ca {(B O_{3})}_{2}$

The phosphors of

{Ce}^{3 +}

activated

{Ba}_{2} Ca {(B O_{3})}_{2}

with chemical formulas

{Ba}_{2 (1 - x)} {Ce}_{x} {Na}_{x} Ca {(B O_{3})}_{2}

and

{Ba}_{2} {Ca}_{1 - 2 x} {Ce}_{x} {Na}_{x} {(B O_{3})}_{2}

were prepared. The luminescence properties have been investigated under vacuum ultraviolet UV and x-ray excitation. Though the point defects

{Ce}_{{Ba}^{∙}}

and

{Na}_{{Ba}^{'}}

are expected to occur in samples

{Ba}_{2 (1 - x)} {Ce}_{x} {Na}_{x} Ca {(B O_{3})}_{2}

, and

{Ce}_{{Ca}^{∙}}

and

{Na}_{{Ca}^{'}}

are expected to appear in samples

{Ba}_{2} {Ca}_{1 - 2 x} {Ce}_{x} {Na}_{x} {(B O_{3})}_{2}

according to the formulas of the compounds, however, two types of

{Ce}^{3 +}

centers were found in all samples due to the occupancy of both

{Ba}^{2 +}

and

{Ca}^{2 +}

sites. So the influence of doping concentration on the preferential site occupancy was studied, and it was found that

{Ce}^{3 +}

ions always preferentially enter

{Ba}^{2 +}

sites at low doping concentration for both samples

{Ba}_{2 (1 - x)} {Ce}_{x} {Na}_{x} Ca {(B O_{3})}_{2}

and

{Ba}_{2} {Ca}_{1 - 2 x} {Ce}_{x} {Na}_{x} {(B O_{3})}_{2}

. In addition, the

5 d

energy levels and decay behaviors for

{Ce}^{3 +}

This publication has 15 references indexed in Scilit:

Luminescence and site occupancy of Ce3+ in Ba2Ca(BO3)2