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

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.

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Impact of electron-LO-phonon correction and donor impurity localization on the linear and nonlinear optical properties in spherical core/shell semiconductor quantum dots

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2018.04.185 ◽

2018 ◽

Vol 753 ◽

pp. 68-78 ◽

Cited By ~ 5

Author(s):

S. M'zerd ◽

M. El Haouari ◽

A. Talbi ◽

E. Feddi ◽

M.E. Mora-Ramos

Keyword(s):

Quantum Dots ◽

Optical Properties ◽

Nonlinear Optical ◽

Semiconductor Quantum Dots ◽

Nonlinear Optical Properties ◽

Core Shell ◽

Donor Impurity ◽

Spherical Core ◽

Linear And Nonlinear

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Significant Suppression of Photoluminescence in Eu3+ Doped LaPO4 Inverse Opal Photonic Crystals

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.311-313.1217 ◽

2011 ◽

Vol 311-313 ◽

pp. 1217-1221

Author(s):

Zheng Wen Yang ◽

Ji Zhou ◽

Jian Bei Qiu ◽

Zhi Guo Song ◽

Da Cheng Zhou ◽

...

Keyword(s):

Photonic Crystal ◽

Photonic Crystals ◽

Self Assembly ◽

Photonic Band Gap ◽

Sol Gel ◽

Stop Band ◽

Inverse Opal ◽

Significant Suppression ◽

Photonic Stop Band ◽

Assembly Technique

Inverse opal photonic crystals of Eu3+ doped LaPO4 (LaPO4: Eu）were prepared by a self-assembly technique in combination with a sol-gel method. In the preparation process, Eu3+ doped LaPO4 precursors were filled into the interstices of the opal template assembled by monodispersive polystyrene microspheres. The polystyrene template was then removed by calcination at 650 °C for 5h, meanwhile, Eu3+doped LaPO4 inverse opal photonic crystal was formed. The photoluminescence (PL) from Eu3+ doped LaPO4 inverse opal photonic crystal was studied. The effect of the photonic stop-band on the spontaneous emission of Eu3+ has been observed in the inverse opal photonic crystals of Eu3+ doped LaPO4. Significant suppression of the emission was detected if the photonic band-gap overlaps with the Eu3+ ions emission band.

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Effect of dopant concentration and the role of ZnS shell on optical properties of Sm3+ doped CdS quantum dots

RSC Advances ◽

10.1039/d0ra08056j ◽

2021 ◽

Vol 11 (14) ◽

pp. 7961-7971

Author(s):

N. D. Vinh ◽

P. M. Tan ◽

P. V. Do ◽

S. Bharti ◽

V. X. Hoa ◽

...

Keyword(s):

Quantum Dots ◽

Optical Properties ◽

Dopant Concentration ◽

Core Shell ◽

Cds Quantum Dots ◽

Cds Qds

The role of samarium (Sm) dopant on the structural, morphological, and optical properties of CdS QDs and CdS/ZnS core/shell QDs was methodically reported.

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