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Manganese-Doped Zinc Orthosilicate-Bearing Phosphor Microparticles with Controlled Three-Dimensional Shapes Derived from Diatom Frustules

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Mn-doped zinc orthosilicate (Zn2SiO4)-bearing phosphor microparticles were synthesized with controlled three-dimensional (3-D) morphologies inherited from the microshells (frustules) of diatoms (unicellular algae). Silica-based diatom frustules were first coated with manganese and zinc oxide nanoparticles by exposure to an acetate precursor solution and then firing at 700°C. Subsequent reaction of the nanoparticles with the underlying silica at 1050°C yielded compact, continuous, and conformal Mn-doped Zn2SiO4 coatings on the frustule surfaces. The converted 3-D microparticles exhibited bright green emission upon stimulation with 275-nm light. Photoluminescent microparticles with a wide variety of well-controlled 3-D morphologies can be mass produced with this simple, low-cost bioclastic process.
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Document Type: Research Article

Affiliations: School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245

Publication date: April 1, 2007

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