Title :
Synthesis and optical properties of colloidal core-shell semiconductor nanocrystals quantum dots for sensory application
Author :
Nga, Pham Thu ; Chuc, Nguyen Van ; Chinh, Vu Duc ; Nghia, Nguyen Xuan ; Dung, Phan Tien ; Cuong, Pham Thai ; Ha, Chu Viet ; Hanh, Vu Hong ; Lien, Vu Thi Kim ; Thuan, Dao Nguyen ; Barthou, C. ; Benalloul, P. ; Romanelli, M. ; Maître, A.
Author_Institution :
Vietnamese Acad. of Sci. & Technol., Hanoi
Abstract :
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.
Keywords :
colloidal crystals; luminescence; nanostructured materials; semiconductor quantum dots; Auger recombination; colloidal core-shell semiconductor nanocrystals quantum dots; effective mass theory; energy shift; opal structures; optical enhancement properties; optical properties; photoluminescence; sensory application; Absorption; Biomedical optical imaging; Effective mass; Nanocrystals; Optical sensors; Photoluminescence; Quantum dots; Radiative recombination; Spontaneous emission; Zinc compounds;
Conference_Titel :
Sensors, 2006. 5th IEEE Conference on
Conference_Location :
Daegu
Print_ISBN :
1-4244-0375-8
Electronic_ISBN :
1930-0395
DOI :
10.1109/ICSENS.2007.355708