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http://dx.doi.org/10.3740/MRSK.2002.12.11.840

Preparation and Properties of Spherical BaMgAl10O17:Eu Phosphor by Multi-step Precipitation Method  

Park, Jumg-Min (Advanced Materials Division, Korea Research Institute of Chemical Technology)
Jung, Ha-Kyun (Advanced Materials Division, Korea Research Institute of Chemical Technology)
Park, Hee-Dong (Advanced Materials Division, Korea Research Institute of Chemical Technology)
Park, Yoon-Chang (Department of Chemistry, Sungkyunkwan University)
Publication Information
Korean Journal of Materials Research / v.12, no.11, 2002 , pp. 840-844 More about this Journal
Abstract
A spherical $BaMgAl_{10}$ $O_{17}$ :Eu phosphor has been synthesized by a multi-step precipitation route. In order to successfully synthesize the phosphor with spherical shape, the hydrated-alumina particles should be controlled for spherical shape. In this process, the hydroxypropyl cellulose (HPC) was used as a dispersing reagent. This reagent plays an important role in that the particles were controlled to have the uniform size of sub-micron. The final product prepared by the multi-step precipitation method maintained spherical shape with uniform size of 0.4$\mu\textrm{m}$. It can be seen in X-ray diffraction patterns, formation of the single phase of $BaMgAl_{10}$ $O_{17}$ :Eu phosphor prepared by the multi-step precipitation method at $1350^{\circ}C$. Also, the emission spectra of spherical $BaMgAl_{O}$ $10_{17}$ :Eu phosphor in the present case was compared with those of commercially-available blue phosphor under VUV (Vacuum Ultra Violet) excitation. The luminescence process of the $BaMgAl_{10}$ $O_{17}$ :Eu phosphor is characterized by the $4f^{6}$$5d^1$longrightarrow4f$^{7}$ transition (blue) of the $Eu^{2+}$ ion acting as an activating center and the maximum luminescence intensity was obtained by reduction treatment at 145$0^{\circ}C$.
Keywords
multi-sten precipitation; ${BaMgAl_{10}}{O_{17}}$:Eu phosphor; uniform; spherical particle; sub-micron;
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