DETECTION OF SHALLOW ELECTRON TRAPS IN QUANTUM SIZED CDS BY FLUORESCENCE QUENCHING EXPERIMENTS
DETECTION OF SHALLOW ELECTRON TRAPS IN QUANTUM SIZED CDS BY FLUORESCENCE QUENCHING EXPERIMENTS
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DOI：
10.1016/0009-2614(93)85400-i
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发表时间：
1993-02-19
影响因子：
2.8
通讯作者：
WELLER, H
中科院分区：
文献类型：
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作者：
HASSELBARTH, A;EYCHMULLER, A;WELLER, H
对量子尺寸CdS胶体的激子荧光和陷阱荧光进行了稳态和时间分辨猝灭测量。我们发现，硝基甲烷是唯一能够几乎完全淬灭的激子荧光，而一小部分的捕获的荧光，其量取决于颗粒的大小，总是仍然存在。甲基紫精，具有稍微更积极的受体电位，能够淬灭这两种类型的荧光几乎完全在所有的调查样品。研究结果被解释直截了当的荧光机制，涉及浅电子陷阱和位于纳米晶颗粒表面上的深孔陷阱。
Stationary and time-resolved quenching measurements of the excitonic and trapped fluorescence of quantum sized CdS colloids were carried out. We found that nitromethane is only capable of quenching the excitonic fluorescence nearly completely, whereas a fraction of the trapped fluorescence, the amount of which depends on the particle size, always remains. Methylviologen, with a slightly more positive acceptor potential, is able to quench both types of fluorescence nearly completely in all the investigated samples. The findings are explained straightforwardly by a fluorescence mechanism involving shallow electron traps and deep hole traps located on the surface of the nanocrystalline particles.