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Phosphor Materials (phosphor + material)

Distribution by Scientific Domains
Polymers and Materials Science100%

Selected Abstracts

Biological Templating: Bioinspired Design of SrAl2O4:Eu2+ Phosphor (Adv. Funct.

ADVANCED FUNCTIONAL MATERIALS, Issue 4 2009
Mater.
The morphology of native pine wood is replicated to generate a novel cellular phosphor material based on Eu-doped strontium aluminate. On page 599, the authors describe the infiltration and conversion of the original cell wall pattern using the biotemplating technique. The obtained materials show a strong green photoluminescence. Biological templates offer a novel approach for designing advanced micropatterned phosphor materials. [source]

Bioinspired Design of SrAl2O4:Eu2+ Phosphor

ADVANCED FUNCTIONAL MATERIALS, Issue 4 2009
Mariya H. Kostova
Abstract A phosphor based on Sr0.97Al2O4:Eu0.03 with a biomorphous morphology is manufactured via vacuum assisted infiltration of wood tissue (Pinus sylvestris) with a precursor nitrate solution. The nitrate solution penetrates homogeneously into the uniform arrangement of rectangular shaped tracheidal cells of the wood tissue. According to scanning electron microscopy, the original wood cell walls are completely transformed retaining the original wood structure. The major crystalline phase is monoclinic SrAl2O4, detected by X-ray diffraction and confirmed by Rietveld refinement. Energy-dispersive X-ray analysis proves the homogeneous conversion of the original wood cell wall into Sr0.97Al2O4:Eu0.03 struts. The optical properties of the resulting phosphor material are determined by photoluminescence and cathode-luminescence spectroscopy in scanning electron microscopy. The biotemplated Sr0.97Al2O4:Eu0.03 shows a characteristic green emission at 530,nm (2.34,eV). Shaping biomorphous SrAl2O4:Eu2+ phosphor with a microstructure pseudomorphous to the bioorganic template anatomy offers a novel approach for designing micropatterned phosphor materials. [source]

Biological Templating: Bioinspired Design of SrAl2O4:Eu2+ Phosphor (Adv. Funct.

ADVANCED FUNCTIONAL MATERIALS, Issue 4 2009
Mater.
The morphology of native pine wood is replicated to generate a novel cellular phosphor material based on Eu-doped strontium aluminate. On page 599, the authors describe the infiltration and conversion of the original cell wall pattern using the biotemplating technique. The obtained materials show a strong green photoluminescence. Biological templates offer a novel approach for designing advanced micropatterned phosphor materials. [source]

Bioinspired Design of SrAl2O4:Eu2+ Phosphor

ADVANCED FUNCTIONAL MATERIALS, Issue 4 2009
Mariya H. Kostova
Abstract A phosphor based on Sr0.97Al2O4:Eu0.03 with a biomorphous morphology is manufactured via vacuum assisted infiltration of wood tissue (Pinus sylvestris) with a precursor nitrate solution. The nitrate solution penetrates homogeneously into the uniform arrangement of rectangular shaped tracheidal cells of the wood tissue. According to scanning electron microscopy, the original wood cell walls are completely transformed retaining the original wood structure. The major crystalline phase is monoclinic SrAl2O4, detected by X-ray diffraction and confirmed by Rietveld refinement. Energy-dispersive X-ray analysis proves the homogeneous conversion of the original wood cell wall into Sr0.97Al2O4:Eu0.03 struts. The optical properties of the resulting phosphor material are determined by photoluminescence and cathode-luminescence spectroscopy in scanning electron microscopy. The biotemplated Sr0.97Al2O4:Eu0.03 shows a characteristic green emission at 530,nm (2.34,eV). Shaping biomorphous SrAl2O4:Eu2+ phosphor with a microstructure pseudomorphous to the bioorganic template anatomy offers a novel approach for designing micropatterned phosphor materials. [source]

Highly Fluorescent Mesostructured Films that consist of Oligo(phenylenevinylene),Silica Hybrid Frameworks,

ADVANCED FUNCTIONAL MATERIALS, Issue 22 2008
Norihiro Mizoshita
Abstract Highly fluorescent and visible-light-responsive mesostructured organosilica films are successfully obtained by acidic sol,gel polycondensation of oligo(phenylenevinylene) (OPV)-bridged organosilane and tetraethoxysilane precursors in the presence of a template surfactant. The OPV-bridged organosilane precursors with different lateral alkoxy substituents, hexyloxy and 2-ethylhexyloxy, and no substituent, are synthesized by Rh-catalyzed silylation of corresponding aromatic iodides. From the organosilane precursors, three kinds of mesostructured OPV,silica hybrid films are prepared by spin-casting using evaporation-induced self-assembly. UV-vis absorption and fluorescence behavior of the OPV,silica hybrid films show that the optical properties and intermolecular interactions of the OPV moieties embedded within the organosilica frameworks strongly depend on the lateral alkoxy substituents in the precursors. The hexyloxy and 2-ethylhexyloxy substituents prevent aggregation of the OPV units in the organosilica frameworks; this result leads to high fluorescence quantum yields of 0.48,0.61 and 0.63,0.66, respectively, while non-substitution leads to lower fluorescence quantum yields of 0.25,0.34. Fluorescence decay profiles of the organosilica hybrid films also confirm a suppression of the aggregation of OPV moieties by the lateral substituents. These mesostructured organosilica films with significant optical properties in the visible-light region are promising as a new class of phosphor materials. [source]

A Novel Narrow Band Red-Emitting Phosphor for White Light Emitting Diodes

INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY, Issue 4 2009
Sivakumar Vaidyanathan
Research on down conversion phosphor materials is the key for the development of solid-state lighting (SSL). Especially finding alternative red phosphor for white light emitting diodes (LEDs) based on blue or near ultraviolet (NUV) LEDs is important research task. In this view, we have synthesized a series of Eu3+ -substituted La2W2,xMoxO9 (x=0,2, in step of 0.3) red phosphor and characterized by X-ray diffraction (XRD) and photoluminescence. XRD results reveal a phase transition from triclinic to cubic structure for x>0.2. All the compositions show broad charge transfer (CT) band due to CT from oxygen to tungsten/molybdenum and red emission due to Eu3+ ions. Select compositions show high red emission intensity compared with the commercial red phosphor under NUV/blue ray excitation. Hence, this candidate can be a possible red phosphor for white LEDs. [source]