Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Growth of long persistent $SrAl_2O_4:Eu^{2+},\;Dy^{3+}$ phosphor single crystals by the Verneuil method

베르누이법 의한 장잔광성 $SrAl_2O_4:Eu^{2+},\;Dy^{3+}$ 단결정 성장

  • Nam, Kyung-Ju (Department of Gemological Engineering, Dongshin University) ;
  • Choi, Jong-Keon (Department of Gemological Engineering, Dongshin University)
  • 남경주 (동신대학교 보석공학과) ;
  • 최종건 (동신대학교 보석공학과)
  • Published : 2005.12.31
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Abstract

We have grown the long persistent $SrAl_2O_4:Eu^{2+},\;Dy^{3+}$ phosphor single crystal by Verneuil method. The obtained single crystals were long persistent phosphorescence peaking at ${\lambda}=520nm$ with a size of about 5 mm diameter, 55 mm length. The melting temperature of $SrAl_2O_4:Eu^{2+},\;Dy^{3+}$ measured $T_{mp}=1968^{\circ}C$. The optimum composition was $SrCO_3:Al(OH)_3:Eu_2O_3:Dy_2O_3$ = 1 : 2 : 0.015 : 0.02. Flow rate of $H_2:O_2$ is about 4 : 1. Growthing rate is about 5 mm/hr. The spectra of the phosphorescence from the crystals are quite similar to those obtained with sintered powders used for luminous pigments. The crystalline structure of long persistent $SrAl_2O_4:Eu^{2+},\;Dy^{3+}$ phosphor single crystal was determined by X-ray diffraction.

본 연구에서는 장잔광성 $SrAl_2O_4:Eu^{2+},\;Dy^{3+}$ 단결정을 베르누이법으로 성장시켰다. 성장된 $SrAl_2O_4:Eu^{2+},\;Dy^{3+}$ 단결정은 지름이 5 mm, 길이는 55 mm이다. 상온(300 K)과 저온(15 K)에서 각각 photoluminescence를 측정한 결과, 상온에서는 ${\lambda}=526nm$에서만 나타났으나, 저온에서는 454nm 영역과 526nm 영역에서 발광피크를 나타내었다. 이는 형광도료로 사용되는 분말과 유사한 결과이다. 결정성장 시 적외선 광고온계로 녹는점을 측정한 결과는 $1968^{\circ}C$였다. 결정을 성장시키는 최적의 조성은 $SrCO_3:Al(OH)_3:Eu_2O_3:Dy_2O_3$ = 1 : 2 : 0.015 : 0.02이고 $H_2:O_2$의 혼합비는 약 4 : 1이다. 성장속도는 시간당 5mm이다. 성장된 단결정의 결정구조는 XRD로 측정하였다.

Keywords

References

  1. T. Matsuzawa, Y. Aoki, N. Takeuchi and Y. Murayama, 'A new long phosphorescent phosphor with high brightness, $SrAl_2O_4LEu^{2+}\;,\;Dy^{3+}$', J. Electrochem. Soc. 143(8) (1996) 2670 https://doi.org/10.1149/1.1837067
  2. L. Yuanhua, Z. Zhongtai, Z. Feng, T. Zilong and C. Qingming, 'Preparation of the ultrafine $SrAl_2O_4$: Eu, Dy needle-like phosphor and its optical properties', Materials Chemistry and Physics 65 (2000) 103
  3. Y. Ping, K. L. Meng, F. S. Chun, W. L. Su, X. Dong, R. Y. Duo and F. C. Xiu, 'Preparation and tunable photoluminescence characteristics of $Ni^{2+}\;:\;SrAl_2O_4$', Optical Materials 24 (2003) 575 https://doi.org/10.1016/S0925-3467(03)00147-2
  4. D. Ravichandran, S. T. Johnson, S. Erdei, R. Roy and W. B. White, 'Crystal chemistry and luminescence of the $Eu^{2+}$-activated alkaline earth aluminate phosphors', Displays 19 (1999) 197
  5. D. Andre and C. Mickael, 'Crystallisation of spraydried amorphous precursors in the $SrO-Al_2O_3$ system: a DSC study', J. European Ceramic Society 23 (2003) 2075 https://doi.org/10.1016/S0955-2219(03)00015-3
  6. J. Sanchez-Benitez, A. de Andres, M. Marchal, E. Cordoncillo, M. Vallet Regi and P. Escribano, 'Optical study of $SrAl_{1.7}B_{0.3}O_4$ : Eu, R (R = Nd, Dy) pigments with long-lasting phosphorescence for industrial uses', J. Solid State Chem. 171 (2003) 273
  7. C. H. L. Goodman, Crystal Growth Theory and Techniques, Plenum press, New York and London (1978) p.109