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Growth of long persistent SrAl2O4 : Eu2+, Dy3+ phosphor single crystals by the Verneuil method

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2005, 15(6), pp.225~228
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering

Jong Geon Choi 1,  Kyungju Nam 1

1동신대학교

Accredited

ABSTRACT

We have grown the long persistent SrAl2O4 :Eu2+, Dy3+ phosphor single crystal by Verneuil method. The obtainedsingle crystals were long persistent phosphorescence peaking at λ= 520 nm with a size of about 5 m diameter, 55 m length.The melting temperature of SrAl2O4 :Eu2+, Dy3+ measured Tmp=1968oC. The optimum composition was SrCO3 :Al(OH)3 :Eu2O3 :Dy2O3 = 1 : 2 : 0.015 : 0.02. Flow rate of H2 :O2 is about 4 : 1. Growthing rate is about 5 m/hr. The spectra of thephosphorescence from the crystals are quite similar to those obtained with sintered powders used for luminous pigments.The crystalline structure of long persistent SrAl2O4 :Eu2+, Dy3+ phosphor single crystal was determined by X-ray diffraction.

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