Optical studies on the conversion from Ag+ to Ag- centers by the electrolytic coloration in NaCl and KCl crystals

被引：2
作者：
Kawai, Teketoshi [1 ]
Hirai, Takeshi [2 ]
Bando, Kazuki [3 ]
机构：
[1] Osaka Prefecture Univ, Grad Sch Sci, Dept Phys Sci, Gakuen Cho 1-1, Sakai, Osaka 5998531, Japan
[2] Ritsumeikan Univ, Fac Sci & Engn, Dept Phys Sci, Noji Higashi 1-1-1, Shiga 5258577, Japan
[3] Shizuoka Univ, Dept Phys, Fac Sci, Suruga ku, 836 Ohya, Shizuoka 4228529, Japan
来源：
OPTICAL MATERIALS | 2018年 / 77卷
关键词：
Ag+ center; Ag-; center; Electrolytic coloration; Alkali chloride; ALKALI-HALIDE CRYSTALS; EXCITED-STATES; IONS; ABSORPTION; SILVER; LUMINESCENCE; LATTICE; ATOMS; CU;
D O I：
10.1016/j.optmat.2018.01.007
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have investigated optical spectra of uncolored and electrolytically-colored NaCI:Ag+ and KCI:Ag+ crystals at low temperatures. In the uncolored crystals, the several absorption bands due to the 4d(10) -> 4d(9)5s transitions in Ag+ ions are observed in the energy region below the absorption edge of the host crystals. When the uncolored crystals are electrolytically colored, the absorption bands due to the Ag+ centers decrease and the C absorption band due to Ag- centers appears with the compensation for the decrease of the absorption bands due to the Ag+ centers. The fact implies that the conversion from the Ag+ to Ag- centers occurs through the electrolytic coloration. In the crystals with the Ag+ concentration below about 10(18) cm(-3), the conversion efficiency from the Ag+ to Ag centers reached more than 60%. The conversion processes from the Ag+ to Ag centers are discussed. (C) 2018 Elsevier B.V. All rights reserved.
引用
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页码：30 / 33
页数：4
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