ISSN:
1063-7834
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Kinetics and spectral composition of the luminescence of a KTaO3:0.1%Cr,10%Li sample (molar charge percentages) have been studied within a broad temperature range (2–300 K). The luminescence spectra of KTaO3:0.1%Cr,10%Li have been found to have a strong narrow R-line characteristic of Cr3+ ions, with a clearly pronounced vibronic wing. Whereas the R-line width in Li-codoped samples is only higher by 120% than that of crystals doped only with chromium, the R-luminescence intensity in the presence of lithium increases by several orders of magnitude. It is shown that the luminescence excitation, besides the intracenter mechanism, is dominated by a process involving photoinduced charge transfer, which results in specific kinetics of the photoluminescence. The luminescence excitation model considered in the work is based, in particular, on the substantial role played in this process by electronic polaron capture by the Li+ dipole center caused by the existence of a characteristic shallow electron trap.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1134/1.1130205
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