LUMINESCENCE OF PB-2+ IN SRTIO3

被引：48
|
作者：
FOLKERTS, HF
BLASSE, G
机构：
[1] Debye Institute, University Utrecht, 3508 TA Utrecht
来源：
CHEMISTRY OF MATERIALS | 1994年 / 6卷 / 07期
关键词：
D O I：
10.1021/cm00043a018
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The luminescence of Sr1-xPbxTiO3 powder samples is reported for several values of x. In all cases, except x = 1, the self-trapped exciton (STE) emission of SrTiO3 is accompanied by an overlapping emission band at lower energy due to a center involving Pb2+. The relative emission intensities of these individual bands vary with temperature and Pb2+ concentration. The bandgap energy is decreased in the samples doped with 50% and 100% Pb2+, which is explained by the increased Pb2+ wave-function overlap. It is concluded that the luminescence due to Pb2+ centers involves decay from conduction band levels to the ground level of Pb2+. This level appears to be situated just above the valence band. A broad-band luminescence of the same origin is found in PbTiO3. In addition, evidence for free exciton emission is observed.
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页码：969 / 972
页数：4
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