Microscopic Origin of the Fast Blue-Green Luminescence of Chemically Synthesized Non-oxidized Silicon Quantum Dots
Microscopic Origin of the Fast Blue-Green Luminescence of Chemically Synthesized Non-oxidized Silicon Quantum Dots
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DOI：
10.1002/smll.201200477
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发表时间：
2012-10-22
期刊：
影响因子：
13.3
通讯作者：
Gregorkiewicz, Tom
中科院分区：
文献类型：
--
作者：
Dohnalova, Katerina;Fucikova, Anna;Gregorkiewicz, Tom
明亮的纳秒蓝绿色光致发光（PL）的微观起源，经常报道的合成有机封端的硅量子点（Si-QD），尚未完全解决，阻碍了这种有趣的材料的潜在应用。在这里，从烷基封端的硅量子点的尺寸为23 nm，通过湿化学合成制备的PL的全面研究报告。在合奏和那些从单个纳米物体水平上获得的结果进行了比较，他们提供了确凿的证据，有效的和可调的发射产生由于限制在硅量子点的电子空穴对的辐射复合。这种理解铺平了道路的化学合成的应用程序的发展与可调尺寸和带隙的硅量子点。
The microscopic origin of the bright nanosecond blue-green photoluminescence (PL), frequently reported for synthesized organically terminated Si quantum dots (Si-QDs), has not been fully resolved, hampering potential applications of this interesting material. Here a comprehensive study of the PL from alkyl-terminated Si-QDs of 23 nm size, prepared by wet chemical synthesis is reported. Results obtained on the ensemble and those from the single nano-object level are compared, and they provide conclusive evidence that efficient and tunable emission arises due to radiative recombination of electronhole pairs confined in the Si-QDs. This understanding paves the way towards applications of chemical synthesis for the development of Si-QDs with tunable sizes and bandgaps.