Photoluminescence Properties of Zn2SiO4:Mn 2+ Inverse Opals

2007 ◽  
Vol 280-283 ◽  
pp. 541-544
Author(s):  
Bo Li ◽  
Ji Zhou ◽  
Rui Long Zong ◽  
Long Tu Li
Keyword(s):  
Self Assembly ◽  
Sol Gel ◽  
Photoluminescence Properties ◽  
Polystyrene Spheres ◽  
Inverse Opals ◽  
Β Phase ◽  
Α Phase ◽  
Gel Technique ◽  
Dominant Phase ◽  
Opal Template

Mn2+-doped Zn2SiO4 inverse opals were synthesized by sol-gel technique combined with the self-assembly of the opal template. Zn2SiO4:Mn2+ precursors were infiltrated into the interstices of the opal template assembled by polystyrene spheres. The polystyrene template was removed by calcining and nanocrystals of Mn2+-doped Zn2SiO4 were obtained in the void of opal template. The inverse opals show photonic crystal behavior and emit yellow light initially with the luminescent peak at 562 nm corresponding with the fact that β-phase is the dominant phase for nanocrystals less than 30nm. As the β-phase transformed to α-phase with the gradual increase of treating temperature and the growth of the crystal, the luminescence from Zn2SiO4:Mn2+ phosphors change from yellow to green.

Fabrication of Barium Titanate Inverse Opals by Sol-Gel Electrophoretic Deposition Process

2010 ◽  
Vol 434-435 ◽  
pp. 247-252 ◽  
Author(s):  
Bo Li ◽  
Jin Qing Wang ◽  
Rei Fujiwara ◽  
Makoto Kuwabara ◽  
Ming Fu ◽  
...  
Keyword(s):  
Barium Titanate ◽  
Photonic Crystals ◽  
Electrophoretic Deposition ◽  
Sol Gel ◽  
Deposition Process ◽  
Visible Range ◽  
Face Centered Cubic ◽  
Sem Images ◽  
Inverse Opals ◽  
Opal Template

Barium titanate (BTO) inverse opal photonic crystals were fabricated by a process of self-assembly of polystyrene opal template in combination with electrophoretic deposition (EPD) of nanoparticles from BTO suspension. In this process, stable monodispersed suspension of BTO nanoparticles was prepared by dispersing BTO gel into a mixed solvent of 2-methoxyethanol and acethylacetone. Then the BTO nanoparticles were infilled into the interstices of the opal template formed by monodisperse polystyrene microspheres by electrophoretic deposition, and then polystyrene template was removed by calcining the specimen at a final temperature of 500oC. SEM images show that the inverse opals possess face-centered cubic (fcc) structure with center to center distant of the air spheres 310 nm. A photonic bandgap in the visible range is observed from reflection spectra of the sample. Such BTO inverse opals as photonic crystals should be useful in device applications.

Photoluminescence Properties Influenced by Calcining Condition and Doping Concentration of Nano-Sized ZnGa2O4: Cr3+

2009 ◽  
Vol 610-613 ◽  
pp. 616-620 ◽  
Author(s):  
Wei Wei Zhang ◽  
Jun Ying Zhang ◽  
Hui Wan ◽  
Zi Yu Chen ◽  
Tian Min Wang
Keyword(s):  
Spinel Structure ◽  
Doping Concentration ◽  
Sol Gel ◽  
Blue Shift ◽  
Maximum Height ◽  
Photoluminescence Properties ◽  
Phosphor Powder ◽  
Red Emission ◽  
Intrinsic Excitation ◽  
Gel Technique

Chromium-activated ZnGa2O4 nano-sized phosphor powder was prepared by the Sol-Gel technique using citric acid as chelator, and the microstructure and luminescent property were studied. The host ZnGa2O4 belongs to the spinel structure and the ZnGa2O4:Cr3+ phosphor powder exhibited bright red emission band. The excitation bands with peak of maximum height at about 250 nm, 410 nm and 560 nm were related to the charge transfer (CT) of Ga-O, 4A2-4T1 and 4A2-4T2 transitions of Cr3+, respectively. Different quenching concentrations of the CT state and intrinsic excitation were discovered originating from different energy transfer schemes. Meanwhile, with the increasing of the calcining temperature the PLE spectrum exhibited an obvious blue-shift which is attributed to the enhancement of the crystal field.

Structural, Magnetic, and Photoluminescence Properties of BiFeO3: Er-Doped Nanoparticles Prepared by Sol-Gel Technique

2018 ◽  
Vol 32 (4) ◽  
pp. 1035-1042 ◽  
Author(s):  
K. Sunil Kumar ◽  
M. Ramanadha ◽  
A. Sudharani ◽  
S. Ramu ◽  
R. P. Vijayalakshmi
Keyword(s):  
Sol Gel ◽  
Photoluminescence Properties ◽  
Gel Technique ◽  
Er Doped

Synthesis and upconversion emission properties of Pb0·9La0·1TiO3:Yb, Tb inverse opals by sol–gel technique

2013 ◽  
Vol 28 (4) ◽  
pp. 187-191 ◽  
Author(s):  
Z W Yang ◽  
D Yan ◽  
Z G Song ◽  
X Yu ◽  
D C Zhou ◽  
...  
Keyword(s):  
Sol Gel ◽  
Upconversion Emission ◽  
Emission Properties ◽  
Inverse Opals ◽  
Gel Technique

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.

Effect of templates on inverse opals fabricated through annular self-assembly/sol–gel method

2011 ◽  
Vol 130 (1-2) ◽  
pp. 59-62 ◽  
Author(s):  
Dengteng Ge ◽  
Lili Yang ◽  
Zeng Fan ◽  
Jiupeng Zhao ◽  
Yao Li
Keyword(s):  
Self Assembly ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Inverse Opals

Fabrication of multi-walled carbon nanotubes/oxide reinforced hollow fibers by sol-gel technique for rapid determination of metronidazole in milk

2014 ◽  
Vol 6 (5) ◽  
pp. 1404-1411 ◽  
Author(s):  
Jia Li ◽  
Yan-Bin Wang ◽  
Lan Wu ◽  
Ke-Yao Li ◽  
Wei Feng
Keyword(s):  
Carbon Nanotubes ◽  
Self Assembly ◽  
Rapid Determination ◽  
Sol Gel ◽  
Hollow Fibers ◽  
Milk Samples ◽  
Multi Walled Carbon Nanotubes ◽  
Gel Technique ◽  
Walled Carbon Nanotubes

Three types of multi-walled carbon nanotubes (MWCNTs)/oxide reinforced hollow fibers layer were fabricated by self-assembly techniques, then compared and applied to extract metronidazole in milk samples by SPME/GC-MS.

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