Polyfluorene nano-rings and nano-dots on mica surfaces: evaporation-induced polymer self-assembly and photoluminescence properties of the assemblies

Soft Matter ◽  
2008 ◽  
Vol 4 (12) ◽  
pp. 2396 ◽  
Author(s):  
Yang Liu ◽  
Takanori Murao ◽  
Yoko Nakano ◽  
Masanobu Naito ◽  
Michiya Fujiki
Keyword(s):  
Self Assembly ◽  
Photoluminescence Properties

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.

Ultra-Large Unilamellar Nanosheets Efficiently Exfoliated from (Y0.95Eu0.05)2(OH)5NO3·nH2O and their Self-Assembly into Oriented Oxide Film with Enhanced Photoluminescence Properties

2014 ◽  
Vol 602-603 ◽  
pp. 1017-1020 ◽  
Author(s):  
Qi Zhu ◽  
J.G. Li ◽  
Xiao Dong Li ◽  
Xu Dong Sun
Keyword(s):  
Rare Earth ◽  
Self Assembly ◽  
Reaction System ◽  
Photoluminescence Properties ◽  
Electronic Components ◽  
High Quality ◽  
Rare Earth Nitrate ◽  
Enhanced Photoluminescence ◽  
Hexagonal Shape ◽  
Enhanced Luminescence

Two dimensional nanophosphors of high quality play an important role in the miniaturization and intelligentization of opto-electronic components. In this present work, ultra-large (30μm) single crystals of (Y0.95Eu0.05)2(OH)5NO3·nH2O layered rare earth hydroxide (LRH) with a hexagonal shape have been synthisized via autoclaving the rare-earth nitrate/NH4OH reaction system in the presence of ammonium nitrate (NH4NO3). The nitrate ions, existing in the interlayer gallery of layered rare earth hydroxide, exhibit facile exchanges with oleate anions by hydrothermal anion exchange. Furthermore, the interlayer distance can thus be expanded from ~0.9 nm for the pristine LRHs to ~3.60 nm for the intercalated ones, which are then efficiently delaminated into unilamellar nanosheets with a lateral size of 10μm and a thickness of ~1.50 nm. The obtained nanosheets are single crystaline. Highly [11 oriented, dense (Y0.95Eu0.05)2O3 phosphor films with excellent optical transparency and a greatly enhanced luminescence intensity have been constructed via self-assembly of ultra-large unilamellar LRH nanosheets, followed by proper annealing.

Syntheses, Crystal Structures and Properties of Two New Manganese(II) Coordination Polymers with Tetrafluorophthalate Ligands

2013 ◽  
Vol 68 (3) ◽  
pp. 277-283 ◽  
Author(s):  
Sheng-Chun Chen ◽  
Jing Qin ◽  
Zhi-Hui Zhang ◽  
Xiao-Xiao Cai ◽  
Jian Gao ◽  
...  
Keyword(s):  
Solid State ◽  
Ir Spectroscopy ◽  
Self Assembly ◽  
The Self ◽  
Photoluminescence Properties ◽  
Double Chain ◽  
Triclinic Space Group ◽  
One Dimensional ◽  
Structures And Properties ◽  
Supramolecular Networks

Two new polymeric MnII complexes, {[Mn(1,2-BDC-F4)(H2O)3](EtOH)}n (1) and [Mn(1,2- BDC-F4)(H2O)2(DMF)]n (2), have been prepared from the reaction of MnII acetate with 3,4,5,6- tetrafluoro-benzene-1,2-dicarboxylic acid (1,2-H2BDC-F4) using different solvents, and characterized by elemental analysis, IR spectroscopy, thermogravimetric (TG) analysis, and single-crystal Xray structure analysis. Both complexes crystallize in the triclinic space group P1̄ and have similar one-dimensional double chain structures, consisting of a unique arrangement of 8-membered and 14- membered rings. The effects of solvent as ligand and/or guest on the self-assembly processes of the supramolecular networks and on their photoluminescence properties in the solid state are discussed.

scholarly journals Multifunctional ionic hybrid poly(propyleneimine) dendrimers surrounded by carbazole dendrons: liquid crystals, optical and electrochemical properties

RSC Advances ◽  
2015 ◽  
Vol 5 (81) ◽  
pp. 65932-65941 ◽  
Author(s):  
Susana Castelar ◽  
Pilar Romero ◽  
José-Luis Serrano ◽  
Joaquín Barberá ◽  
Mercedes Marcos
Keyword(s):  
Liquid Crystals ◽  
Electrochemical Properties ◽  
Self Assembly ◽  
Photoluminescence Properties ◽  
Columnar Mesophases

Hybrid ionic dendrimers prepared via ionic self-assembly by grafting of a cationic PPI dendrimer with bifunctional electroactive carbazole dendrons, display photoluminescence properties and self-assembly into nematic, smectic or columnar mesophases.

Construction and photoluminescence properties of a three-dimensional ZnII coordination network based on naphthalene-1,4-dicarboxylic acid and 1,6-bis(pyridin-3-yl)-1,3,5-hexatriene

2018 ◽  
Vol 74 (9) ◽  
pp. 1053-1057 ◽  
Author(s):  
Qian-Kun Zhou ◽  
Lin Wang ◽  
Yun Xu ◽  
Ni-Ya Li
Keyword(s):  
Dicarboxylic Acid ◽  
Self Assembly ◽  
Three Dimensional ◽  
Square Lattice ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
Hydrothermal Conditions ◽  
X Ray ◽  
Pyridyl Ligands ◽  
Connected Node

In recent years, coordination polymers constructed from multidentate carboxylate and pyridyl ligands have attracted much attention because these ligands can adopt a rich variety of coordination modes and thus lead to the formation of crystalline products with intriguing structures and interesting properties. A new coordination polymer, namely poly[[μ2-1,6-bis(pyridin-3-yl)-1,3,5-hexatriene-κ2 N:N′](μ3-naphthalene-1,4-dicarboxylato-κ4 O 1,O 1′:O 4:O 4′)zinc(II)], [Zn(C12H6O4)(C16H14N2)] n , has been prepared by the self-assembly of Zn(NO3)2·6H2O, naphthalene-1,4-dicarboxylic acid (1,4-H2ndc) and 1,6-bis(pyridin-3-yl)-1,3,5-hexatriene (3,3′-bphte) under hydrothermal conditions. The title compound has been structurally characterized by IR spectroscopy, elemental analysis, powder X-ray diffraction and single-crystal X-ray diffraction analysis. Each ZnII ion is six-coordinated by four O atoms from three 1,4-ndc2− ligands and by two N atoms from two 3,3′-bphte ligands, forming a distorted octahedral ZnO4N2 coordination geometry. Pairs of ZnII ions are linked by 1,4-ndc2− ligands, leading to the formation of a two-dimensional square lattice (sql) layer extending in the ab plane. In the crystal, adjacent layers are further connected by 3,3′-bphte bridges, generating a three-dimensional architecture. From a topological viewpoint, if each dinuclear zinc unit is considered as a 6-connected node and the 1,4-ndc2− and 3,3′-bphte ligands are regarded as linkers, the structure can be simplified as a unique three-dimensional 6-connected framework with the point symbol 446108. The thermal stability and solid-state photoluminescence properties have also been investigated.

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