Photoluminescence spectra resulting from hydroxy groups on magnesium oxide supported on silica
Photoluminescence spectra resulting from hydroxy groups on magnesium oxide supported on silica
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二氧化硅负载的氧化镁上的羟基产生的光致发光光谱
DOI：
10.1039/ft9949002107
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
S. Yoshida
中科院分区：
文献类型：
--
作者：
H. Yoshida;Tsunehiro Tanaka;T. Funabiki;S. Yoshida
使用二氧化硅负载的高度分散的氧化镁物质研究了氧化镁上的羟基产生的光致发光激发和发射光谱。由于该样品几乎只有一种 Mg-O 物质，因此 Mg-O 物质与 H2O 反应会产生与 Mg 离子均匀配位的羟基。因此，获得了清晰的光致发光激发光谱。从激发光谱中阐明了羟基的配位状态。附着在表面镁离子上的羟基被 255 nm 光激发。二氧化硅基质内与 Mg 离子配位的其他羟基被 265 nm 光激发。无论配位如何，样品上的羟基都表现出几乎相同的以 440 nm 为中心的宽发射光谱。
Photoluminescent excitation and emission spectra resulting from hydroxy groups on magnesium oxide have been investigated using highly dispersed magnesium oxide species supported on silica. Since this sample has almost only one kind of Mg—O species, reaction of Mg—O species with H2O produces hydroxy groups uniformly coordinated to Mg ions. Therefore, clear photoluminescent excitation spectra were obtained. Coordination states of the hydroxy groups were elucidated from excitation spectra. The hydroxy group attached to the surface Mg ion is excited by 255 nm light. The other hydroxy groups which are coordinated to Mg ions within the silica matrix are excited by 265 nm light. Hydroxy groups on the sample exhibit almost the same broad emission spectra centred at 440 nm regardless of their coordination.