Field enhancement effect of small Ag particles on the fluorescence from Eu3+-doped SiO2 glass
Field enhancement effect of small Ag particles on the fluorescence from Eu3+-doped SiO2 glass
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DOI：
10.1063/1.123600
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发表时间：
1999-03-15
影响因子：
4
通讯作者：
Nogami, M
中科院分区：
文献类型：
--
作者：
Hayakawa, T;Selvan, ST;Nogami, M
研究了纳米银颗粒对SiO_2玻璃中Eu~(3+)离子光学性质的影响。采用溶胶-凝胶法制备了玻璃样品。由电子平均自由程模型修正的Mie-Drude理论计算出的银颗粒的平均粒径和体积分数，在900℃下随着Ag+还原时间的延长而迅速增大。在4.3 nm的银颗粒存在下，Eu3+离子对N-2激光激发的荧光增强。我们的实验结果表明，增强的荧光来源于Eu3+离子周围的局域场增强，这是由于小银粒子的表面等离子体共振造成的。(C)1999年美国物理研究所。[S0003-6951(99)01311-X]。
We have investigated the effects of nanometer-sized silver particles on the optical properties of Eu3+ ions in SiO2 glass. Glass samples were prepared by the sol-gel method. The mean particle size and volume fraction of silver particles, which were estimated from UV-VIS absorption spectra using Mie-Drude theory modified by electron mean free path model, rapidly increased with the reduction time of Ag+ up to similar to 3 min at 900 degrees C. The fluorescence from Eu3+ ions for the excitation by N-2 laser was greatly enhanced in the presence of silver particles of 4.3 nm size. Our experimental results suggest that the origin of enhanced fluorescence is from local field enhancement around Eu3+ ions, owing to the surface plasmon resonance of small silver particles. (C) 1999 American Institute of Physics. [S0003-6951(99)01311-X].