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

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.

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

2017 ◽  
Vol 24 (1&2) ◽  
pp. 161-170
Author(s):  
Pham Thu Nga ◽  
Vu Duc Chinh ◽  
Nguyen Xuan Nghia ◽  
Nguyen Viet Huy ◽  
Dao Nguyen Thuan ◽  
...  
Keyword(s):  
Experimental Study ◽  
Quantum Dots ◽  
Optical Properties ◽  
Photonic Crystal ◽  
Photonic Crystals ◽  
Self Assembly ◽  
Photonic Band Gap ◽  
Semiconductor Quantum Dots ◽  
Core Shell ◽  
Sphere Diameter

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.

Photocatalytic Activity of Pd Doped Tin Dioxide Inverse Opal Films

2012 ◽  
Vol 534 ◽  
pp. 135-140 ◽  
Author(s):  
Yang Liu ◽  
Bo Li ◽  
You Wei Yao ◽  
Jing Jing Gao ◽  
Zhen Dong Liu ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Self Assembly ◽  
Tin Dioxide ◽  
Uv Light ◽  
Sol Gel ◽  
The Self ◽  
Inverse Opal ◽  
Polystyrene Microsphere ◽  
Assembly Technique

Inverse opal films (IOFs) of SnO2 doped with Pd were prepared by the self-assembly technique using polystyrene microsphere (PS sphere) as template in combination with a sol-gel method. The photocatalysis properties of SnO2 IOFs were estimated through measuring the rate of the degradation of methylene blue (MB). The result shows that SnO2 IOFs have good photocatalytic activity, the solution of MB was degradated over 60% in 4 hours when it was dipped in SnO2 IOFs and exposed in the UV light. The addition of Pd in SnO2 IOFs improved the photocatalytic activity of the films and the degradation of MB can exceed 80% with the same condition. This sort of SnO2 IOFs doped with Pd indicated a potential application in photocatalysis field.

Preparation and Upconversion Luminescence Properties of Tb3+-Yb3+ Co-Doped Phosphate Inverse Opals

2011 ◽  
Vol 311-313 ◽  
pp. 1227-1231
Author(s):  
Kan Zhu ◽  
Zheng Wen Yang ◽  
Dong Yan ◽  
Zhi Guo Song ◽  
Da Cheng Zhou ◽  
...  
Keyword(s):  
Band Gap ◽  
Self Assembly ◽  
Photonic Band Gap ◽  
Upconversion Luminescence ◽  
Sol Gel ◽  
Inverse Opals ◽  
Assembly Technique ◽  
Photonic Band Gap Materials ◽  
Photonic Band ◽  
Co Doped

Upconversion (UC) luminescence photonic band gap materials Tb3+-Yb3+ co-doped phosphate inverse opal photonic crystals were prepared by a self-assembly technique in combination with a sol-gel method. The effect of photonic band gap on UC luminescence was investigated in inverse opals. Effective suppression of the UC luminescence was inspected if the photonic band gap overlapped with the emission band of Tb3+ ions.

Fabrication of Photonic Crystal Based on Polystyrene Particles

2015 ◽  
Vol 827 ◽  
pp. 271-275 ◽  
Author(s):  
Lusi Safriani ◽  
Ian Sopian ◽  
Tuti Susilawati ◽  
Sahrul Hidayat
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystals ◽  
Self Assembly ◽  
Flexible Substrate ◽  
Stop Band ◽  
3D Structure ◽  
Dielectric Materials ◽  
Filling Fraction ◽  
Future Technology ◽  
Assembly Method

Photonic crystals are dielectric materials with different refractive index or permittivity periodically. Photonic crystals have widely application for future technology such as waveguide, optical transistor, cavity of laser and biosensor. Photonic crystals can be fabricated in three types i.e 1D, 2D and 3D structure. In this paper, we report the successful fabrication of 3D photonic crystal from polystyrene particles. The fabrication process began with the synthesis of polystyrene particles followed by deposition on glass and flexible substrate using self-assembly method. We obtained polystyrene monodispered particles which have a uniform shaped with diameter 320 nm. Self-assembly method resulted to the arrangement of polystyrene particles on glass and flexible substrate. Stop band which is related to its optical property are at wavelength of 721 nm and 631 nm for photonic crystal on glass and flexible substrate, respectively. We found that filling fraction of photonic crystal on flexible substrate is lower than that of glass substrate due to some defects.

Photoluminescence Properties of SiO2:Tb3+ Inverse Opal with Tunable Photonic Band Gap

2013 ◽  
Vol 320 ◽  
pp. 155-161 ◽  
Author(s):  
Zhen Dong Liu ◽  
Bo Li ◽  
Ji Zhou
Keyword(s):  
Photonic Crystals ◽  
Band Gap ◽  
Spontaneous Emission ◽  
Emission Band ◽  
Photonic Band Gap ◽  
Sol Gel ◽  
Inverse Opal ◽  
Photoluminescence Properties ◽  
Gel Method ◽  
Photonic Band

Temperature tunable photonic crystals were fabricated based on liquid-infiltrated inverse opal films which were prepared by Tb3+doped SiO2with a sol-gel method. The photoluminescence was investigated with the photonic band gap shift tuned by temperature. The results show that obvious suppression of spontaneous emission occurs when the photonic band gap overlaps with the Tb3+emission band, while enhancement of the emission is observed if the emission band shifts at the edge of the band gap.

scholarly journals Graphene Quantum Dot-TiO2 Photonic Crystal Films for Photocatalytic Applications

Nanomaterials ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2566
Author(s):  
Maria-Athina Apostolaki ◽  
Alexia Toumazatou ◽  
Maria Antoniadou ◽  
Elias Sakellis ◽  
Evangelia Xenogiannopoulou ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Visible Light ◽  
Performance Enhancement ◽  
Photonic Band Gap ◽  
Light Trapping ◽  
Stop Band ◽  
Graphene Quantum Dots ◽  
Inverse Opal ◽  
Crystal Films ◽  
Visible Light Activation

Photonic crystal structuring has emerged as an advanced method to enhance solar light harvesting by metal oxide photocatalysts along with rational compositional modifications of the materials’ properties. In this work, surface functionalization of TiO2 photonic crystals by blue luminescent graphene quantum dots (GQDs), n–π* band at ca. 350 nm, is demonstrated as a facile, environmental benign method to promote photocatalytic activity by the combination of slow photon-assisted light trapping with GQD-TiO2 interfacial electron transfer. TiO2 inverse opal films fabricated by the co-assembly of polymer colloidal spheres with a hydrolyzed titania precursor were post-modified by impregnation in aqueous GQDs suspension without any structural distortion. Photonic band gap engineering by varying the inverse opal macropore size resulted in selective performance enhancement for both salicylic acid photocatalytic degradation and photocurrent generation under UV–VIS and visible light, when red-edge slow photons overlapped with the composite’s absorption edge, whereas stop band reflection was attenuated by the strong UVA absorbance of the GQD-TiO2 photonic films. Photoelectrochemical and photoluminescence measurements indicated that the observed improvement, which surpassed similarly modified benchmark mesoporous P25 TiO2 films, was further assisted by GQDs electron acceptor action and visible light activation to a lesser extent, leading to highly efficient photocatalytic films.

Chemically Responsive Polymer Inverse-Opal Photonic Crystal Films Created by a Self-Assembly Method

2016 ◽  
Vol 120 (22) ◽  
pp. 11938-11946 ◽  
Author(s):  
Huilin Zhao ◽  
Jianping Gao ◽  
Zeng Pan ◽  
Guanbo Huang ◽  
Xiaoyang Xu ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Self Assembly ◽  
Inverse Opal ◽  
Assembly Method ◽  
Responsive Polymer ◽  
Crystal Films

3-Dimensional Photonic Crystals at Optical Wavelengths

1998 ◽  
Vol 07 (02) ◽  
pp. 181-200 ◽  
Author(s):  
S. G. Romanov
Keyword(s):  
Photonic Crystals ◽  
Band Gap ◽  
Photonic Band Gap ◽  
Stop Band ◽  
High Refractive Index ◽  
3 Dimensional ◽  
Optical Wavelength ◽  
Photonic Band Gap Materials ◽  
Optical Wavelengths ◽  
Photonic Band

Different experimental strategies towards the 3-dimensional photonic crystals operating at optical wavelength are classified. The detailed discussion is devoted to the recent progress in photonic crystals fabricated by template method — the photonic band gap materials on the base of opal. The control of photonic properties of opal-based gratings is achieved through impregnating the opal with high refractive index semiconductors and dielectrics. Experimental study demonstrated the dependence of the stop band behaviour upon the type of impregnation (complete or partial) and showed a way for approaching complete photonic band gap. The photoluminescence from opal- semiconductor gratings revealed suppression of spontaneous emission in the gap region with following enhancement of the emission efficiency at the low-energy edge of the gap.

Sol–Gel Fabrication and Luminescence Properties of Multilayer Eu-Doped BaTiO3–SiO2 Xerogel Nanostructures

2019 ◽  
Vol 18 (03n04) ◽  
pp. 1940044 ◽  
Author(s):  
Yu. D. Karnilava ◽  
P. A. Kholov ◽  
N. V. Gaponenko ◽  
T. F. Raichenok ◽  
S. A. Tikhomirov ◽  
...  
Keyword(s):  
Multilayer Structure ◽  
Sol Gel ◽  
Stop Band ◽  
Fused Silica ◽  
Transmission Spectra ◽  
Reflection And Transmission ◽  
Main Band ◽  
Photonic Stop Band ◽  
Band Position ◽  
Double Exponential

With the use of sol–gel method BaTiO3–SiO2 multilayer structures were fabricated on glass or fused silica substrates employing dipping or spinning procedure. The photonic stop band was observed in the reflection and transmission spectra of the multilayer structure annealed at [Formula: see text]C. It is redshifted with an increase of the thicknesses of BaTiO3 and SiO2 layers. For structures comprising Eu-doped BaTiO3 layers of different thicknesses photoluminescence with the main band at 614[Formula: see text]nm was detected. It is characterized with the double-exponential decay with the lifetimes of about 0.5[Formula: see text]ms and 1.1[Formula: see text]ms which do not depend significantly on the photonic stop band position.

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