This paper reviews experimental results on a remarkable increase in luminescence efficiency of SrTiO3:Pr3+ and related compounds by addition of Al ions. Two types of mechanism are proposed on the role of Al ions: charge compensation between Pr3+ at the Sr2+ site and Al3+ substituting for Ti4+ and elimination of SrO layers in SrTiO3 lattice by formation of strontium aluminates. Optical measurements indicate that nonradiative processes in the host-to-activator energy transfer are suppressed by the above mechanism. This phosphor, efficient and electrically conductive as well, is appropriate to applications for VFDs and low-voltage-type FEDs. A similar effect is found for some other Ruddlesden-Popper phases. (C) 2000 Elsevier Science B.V. All rights reserved. References: 12
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