Proceedings of nanoGe Fall Meeting 2018 (NFM18)
Publication date: 6th July 2018
It is well know that Si nanocrystal (Si-nc) exhibits a size tunable and efficient visible luminescence at room temperature due to the quantum confinement effect. Because of its environmental friendliness and low cost, colloidal Si-nc dispersed in solution is a promising material for future solution based light-emitting devices and biomedical applications. Various synthesis techniques for colloidal Si-nc, such as wet-chemical synthesis [1] and high-temperature thermal processing [2], have been demonstrated. Pulsed-laser irradiation in liquid is a simple top-down method for preparing colloidal Si-nc [3]. In this method, by irradiating bulk Si crystal with a high power pulsed-laser light, free-standing Si-nc are generated from the ablation of Si crystal and the subsequent condensation of ablated Si into nanoparticles. However, because of its simplicity, it is difficult to control the emission color (size) of Si-nc and their size distribution is usually wide. Furthermore, the high-yield synthesis of Si-nc nanoparticles are essentially difficult due to the use of its high power pulsed-laser light. Recently, we demonstrated novel pulsed laser irradiation synthesis technique of color tunable colloidal Si-nc, by using an interconnected wire-nanostructure assembly, i.e., porous silicon as a target material [4].
In this work, we report high-yield synthesis by improving our developed pulsed laser irradiation synthesis technique for luminescent color tunable colloidal Si-nc. We shows that alkyl terminated luminescent colloidal Si-nc is efficiently synthesized from pulsed laser irradiation of porous silicon target. The yield of Si-nc is strongly dependent on pulsed laser irradiation conditions. The present synthesis method allows us to realize future top-down and low-cost scalable production of luminescent colloidal Si-nc for solution-based light emitting technology.
The authors would like to thank Dr. Yuan, Prof. Adachi (Gunma University), and Dr. Shimada (Quantum 14 KK Inc.) for their experimental supports and useful discussion. This work was supported by Grant-in-Aid for Young Scientists (B) (16K17506) from the Ministry of Education, Culture, Sports, Science and Technology, Japan.
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