Visible luminescence from octadecylsilane monolayers on silica surfaces : Time-resolved photoluminescence characterization
Visible luminescence from octadecylsilane monolayers on silica surfaces : Time-resolved photoluminescence characterization
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DOI：
10.1063/1.2149290
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发表时间：
2005-12
期刊：
影响因子：
--
通讯作者：
N. Sagawa;T. Uchino
中科院分区：
文献类型：
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作者：
N. Sagawa;T. Uchino
我们发现十八烷基三氯硅烷（OTS）单层吸附在纳米尺寸的二氧化硅颗粒上会产生稳定的蓝色光致发光（PL），时间尺度为纳秒。在〜100至〜300°C的温度下固化后观察到的PL强度增加，表明二氧化硅表面上相邻OTS分子之间的缩合与PL有关。固化样品的 PL 衰减曲线在 77 至 450 K 范围内保持不变，而时间积分 PL 强度则随着温度的升高而单调下降。根据这些实验结果，提出了与 PL 相关的辐射和非辐射过程模型。
We have found that the adsorption of octadecyltrichlorosilane (OTS) monolayers on nanometer-sized silica particles yields a stable blue photoluminescence (PL) with a time scale of nanoseconds. The observed PL intensity increases after curing at temperatures from ∼100 to ∼300 °C, suggesting that condensations between adjacent OTS molecules on the silica surface are related to the PL. The PL decay curve of the cured samples remains unchanged from 77 to 450 K, whereas the time-integrated PL intensity shows a monotonous decrease with increasing temperature. From these experimental results, a model of radiative and nonradiative process associated with the PL is presented.