Luminescence quantum yield and multiplication of electronic excitations in the corundum crystals

被引：0

作者：

V.V. Harutunyan

T.S. Hakobyan

V.A. Gevorkyan

V.N. Makhov

机构：

[1] Yerevan Physics Institute,

[2] Lebedev Physics Institute,undefined

来源：

The European Physical Journal B - Condensed Matter and Complex Systems | 1999年 / 12卷

关键词：

PACS. 61.72.-y Defects and impurities in crystals; microstructure - 61.80.-x Physical radiation effects, radiation damage - 74.62.Dh Effects of crystal defects, doping and substitution;

D O I：

暂无

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学科分类号：

摘要：

The excitation spectra of luminescence in irradiated and nonirradiated corundum crystals are investigated by means of highly polarised synchrotron radiation in 5 to 30 eV region. In the fundamental absorption region the double-exciton peaks are observed in the region 8.5-9.2 eV for irradiated (especially by neutrons) crystals at temperature 90 K. At 9.5 eV sharp drops appeared, in the luminescence spectrum space which were interpreted as nonirradiative near-surface recombination, the probability of which sharply increased at high absorption coefficients. The enhancement of the luminescence efficiency in the high-energy region was connected with the decay effect of electron excitations as well as with the influence of volumetric excitations leading to the enhancement of recombination glow.

引用

页码：31 / 33

页数：2