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Synthesis and optical properties of colloidal core-shell semiconductor nanocrystals quantum dots for sensory application

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14 Author(s)
Pham Thu Nga ; Institute of Materials Science, Vietnamese Academy of Science and Technology, Hanoi, Vietnam. ; Nguyen Van Chuc ; Vu Duc Chinh ; Nguyen Xuan Nghia
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We present results on the synthesis of core-shell CdSe/ZnS semiconductor nanocrystal quantum dots (NQDs) and their optical enhancement properties. A very strong and narrow photoluminescence is observed for sizes varying from 2 to 5 nm. Using an effective mass theory, we model the energy shift for the first excited state for core and core/shell NQDs. Core/shell heterostructure can be used to significantly increase the absorption cross section and decrease the efficiency of Auger recombination. Opal structures prepared from silica beads are also reported. This photonic crystal infiltrated with NQDs shows promise in biological detection.

Published in:

2006 5th IEEE Conference on Sensors

Date of Conference:

22-25 Oct. 2006