Photostimulated luminescence and dynamics of AgI and Ag nanoclusters in zeolites
Photostimulated luminescence and dynamics of AgI and Ag nanoclusters in zeolites
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DOI：
10.1103/physrevb.65.245404
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发表时间：
2002-06-15
影响因子：
3.7
通讯作者：
Roark, J
中科院分区：
文献类型：
--
作者：
Chen, W;Joly, AG;Roark, J
用荧光光谱法研究了在沸石- y中形成的Ag和AgI纳米团簇的光致发光和光激发发光。AgI纳米团簇的光致发光光谱显示AgI纳米团簇和少量存在于AgI纳米团簇中的Ag纳米团簇都有发射，而在光激发发光中，只观察到Ag纳米团簇的发射。Ag和AgI粒子的光致发光寿命均为亚纳秒和微秒，而光激发发光的寿命仅为皮秒。提出了一种光激发发光的模型，该模型将光激发发光归因于捕获在沸石中的电子与靠近陷阱位置的银的复合。在这些系统中，强光激发发光和短衰减的出现表明纳米颗粒在数字存储和医学放射学应用方面具有潜力。
The photoluminescence and photostimulated luminescence of Ag and AgI nanoclusters formed in zeolite-Y are studied using fluorescence spectroscopy. The photoluminescence spectra of AgI nanoclusters show emission from both AgI as well as Ag nanoclusters which are present in small amounts in the AgI nanoclusters, while in the photostimulated luminescence, only the emission of Ag clusters is observed. While the photoluminescence from both Ag and AgI particles displays subnanosecond and microsecond lifetimes, the emission from photostimulated luminescence shows very short, picosecond lifetimes. A model which ascribes the photostimulated luminescence to recombination of electrons trapped in the zeolite with Ag in close proximity to the trap site is proposed. The appearance of strong photostimulated luminescence with short decays in these systems demonstrates that nanoparticles have potential for digital storage and medical radiology applications.