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Optical properties of Yb 3+ doped Y3Al5O12 single crystals derived by the Czochralski method according to growth atmosphere and doping concentration

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2015, 25(2), pp.68-73
  • DOI : 10.6111/JKCGCT.2015.25.2.068
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering

Jang Bo Shim 1,  이영진 1,  Jin Ki Kang 2,  Young Kuk Lee 1

1한국화학연구원
2(주)엔티에스

Accredited

ABSTRACT

Single crystals of Yb 3+ doped Y3Al5O12 up to 25 at.% were grown by the Czochralski method. Using the pulling rate of 0.8 mm/h and the rotation rate of 10 rpm, single crystals with diameters of up to 40 mm and lengths up to 160 mm were obtained. The growth atmosphere was either pure nitrogen or the mixture of nitrogen and oxygen. The crystal was bluish green when using pure nitrogen and the crystal was colorless when using the mixture of 99 % nitrogen and 1 % oxygen. The concentration of Yb 3+ ions decreased with increasing the length of the crystal and Yb 3+ concentration of core area was slightly higher than the other areas in the compositional analysis. The fluorescence lifetime decreased with increasing the doping concentration of Yb 3+ ions.

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