NDLI: Surface effects on the photoluminescence of Si quantum dots

Content Provider	Springer Nature Link
Author	Wang, Chiang Jing Tsai, Meng Yen Chi, Cheng Chung Perng, Tsong Pyng
Copyright Year	2007
Abstract	Si quantum dots (SiQDs) with sizes ranging from 5 to 20 nm were fabricated by vapor condensation. They showed red photoluminescence (PL) in vacuum with the peak located at around 750 nm. After the specimen was exposed to air, the PL intensity became higher, and continued to increase during the PL test with a cycling of vacuum-air-vacuum. In pure oxygen, the PL intensity exhibited an irreversible decrease, while in nitrogen a smaller amount of reversible increase of PL intensity was observed. Furthermore, the PL intensity exhibited a remarkable enhancement if the SiQDs were treated with water. With HF treatment, the PL peak position showed a blue-shift to 680 nm, and was recovered after subsequent exposure to air. Si–O–H complexes were suggested to be responsible for this red luminescence. The irreversible decrease of PL intensity due to oxygen adsorption was speculated to be caused by the modification of chemical bonds on the surface. In the case of nitrogen adsorption, the PL change was attributed to the surface charging during adsorption.
Starting Page	569
Ending Page	574
Page Count	6
File Format	PDF
ISSN	13880764
Journal	Journal of Nanoparticle Research
Volume Number	11
Issue Number	3
e-ISSN	1572896X
Language	English
Publisher	Springer Netherlands
Publisher Date	2007-11-21
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Si Quantum dots Photoluminescence Si–O–H complexes Effects of ambient gases Synthesis Oxygen adsorption Applied Optics, Optoelectronics, Optical Devices Physical Chemistry Inorganic Chemistry Characterization and Evaluation of Materials Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Atomic and Molecular Physics, and Optics Condensed Matter Physics Bioengineering Modeling and Simulation

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