EXPERIMENTAL STUDY OF 3D SELF-ASSEMBLED PHOTONIC CRYSTALS AND COLLOIDAL CORE-SHELL SEMICONDUCTOR QUANTUM DOTS

Pham Thu Nga (Institute of Materials Science, Vietnamese Academy of Science and Technology Faculty of Engineering Physics and Nano -Technology, College of Technology)
Vu Duc Chinh (Institute of Materials Science, VAST)
Nguyen Xuan Nghia (Institute of Materials Science, VAST)
Nguyen Viet Huy (Institute of Materials Science, VAST)
Dao Nguyen Thuan (Faculty of Engineering Physics and Nano -Technology, College of Technology)
Pham Thai Cuong (Thai Nguyen Pedagogical University, Thai Nguyen)
Chu Viet Ha (Thai Nguyen Pedagogical University, Thai Nguyen)
Do Thuy Chi (Thai Nguyen Pedagogical University, Thai Nguyen)
Nguyen Nhu Dat (Institute of Physics and Electronics, VAST,)
Le A Lan Anh (Institute of Chemistry, VAST)
C. Barthou (Institut des Nano Sciences de Paris (INSP), UMR - CNRS 7588)
P. Benalloul (Institut des Nano Sciences de Paris (INSP), UMR - CNRS 7588)
M. Romanelli (Institut des Nano Sciences de Paris (INSP), UMR - CNRS 7588)
A. Maître (Institut des Nano Sciences de Paris (INSP), UMR - CNRS 7588)

ASEAN Journal on Science and Technology for Development
Vol. 24 No. 1-2 (2007): ASEAN Journal on Science and Technology for Development (AJSTD)

In this contribution we present an experimental study of 3D opal photonic crystals. The samples are opals constituted by colloidal silica spheres, realized with self-assembly technique. The sphere diameter is selected in order to obtain coupling of the photonic band gap with the emission from CdSe/ZnS colloidal quantum dots. The quantum dots infiltrated in the opals is expected to be enhanced or suppressed depending on the detection angle from the photonic crystal. The structural and optical characterization of the SiO2 opal photonic crystals are performed by field-emission scanning electron microscopy and reflectivity spectroscopy. Measurements performed on samples permits to put into evidence the influence of the different preparation methods on the optical properties. Study of self-activated luminescence of the pure opals is also presented. It is shown that the luminescence of the sample with QDs have original QD emission and not due to the photonic crystal structure. The optical properties of colloidal core-shell semiconductor quantum dots of CdSe/ZnS which are prepared in our lab will be mention.