Korean Chemical Engineering Research

  • 제46권6호
  • /
  • Pages.1075-1080
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  • 2008
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  • 0304-128X(pISSN)
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  • 2233-9558(eISSN)
한국화학공학회 (The Korean Institute of Chemical Engineers)
권호 표지

분무열분해 공정에 의해 합성된 미세 Gd2O3:Eu 형광체의 발광 특성

Photoluminescence Characteristics of Fine-sized Gd2O3:Eu Phosphor Powders Prepared by Spray Pyrolysis

  • 정대수 (건국대학교 화학공학과) ;
  • 구혜영 (건국대학교 화학공학과) ;
  • 이상호 (건국대학교 화학공학과) ;
  • 강윤찬 (건국대학교 화학공학과)
  • Jung, Dae Soo (Department of Chemical Engineering, Konkuk University) ;
  • Koo, Hye Young (Department of Chemical Engineering, Konkuk University) ;
  • Lee, Sang Ho (Department of Chemical Engineering, Konkuk University) ;
  • Kang, Yun Chan (Department of Chemical Engineering, Konkuk University)
  • 투고 : 2008.10.21
  • 심사 : 2008.12.01
  • 발행 : 2008.12.31
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초록

구연산 및 융제를 함유하는 분무용액으로부터 분무열분해법에 의해 속이 빈 전구체 분말들을 합성하고, 후열처리 과정을 거쳐 미세 $Gd_2O_3:Eu$ 형광체를 합성하였다. 구연산은 전구체 분말들의 다공성을 증대시킴으로써 후열처리 후에 미세 형광체 합성이 가능하게 하였다. 구연산을 첨가하지 않은 분무용액으로부터 합성된 형광체는 수 마이크론 크기를 가졌다. 융제는 형광체 분말의 크기와 자외선 하에서의 발광세기를 증대시켰다. 여러 가지 용제 중 휘도가 우수한 초미세 $Gd_2O_3:Eu$ 형광체 합성에는 $Li_2CO_3$가 적절하였다. $Li_2CO_3$ 융제의 첨가량이 형광체의 3 wt% 이하일 때 소성 온도 $1,050^{\circ}C$ 및 $1,050^{\circ}C$에서 합성된 형광체들은 서브마이크론 크기를 가졌다. 소성 온도 $1,050^{\circ}C$에서 얻어진 형광체의 발광 세기는 소성온도 $1,050^{\circ}C$에서 얻어진 형광체의 124%였다.

Fine-sized $Gd_2O_3:Eu$ phosphor powders were prepared by post-treatment of the precursor powders with hollow shape obtained by spray pyrolysis from the spray solution with citric acid and flux material. Citric acid enabled the synthesis of fine-sized phosphor powders after post-treatment by increasing the hollowness of the precursor powders. The phosphor powders prepared from the spray solution without citric acid had several microns size. Flux materials increased the mean sizes of the phosphor powders. However, flux materials improved the photoluminescence intensities of the phosphor powders under ultraviolet. $Li_2CO_3$ as the flux material was appropriate to prepare the fine-sized $Gd_2O_3:Eu$ phosphor powders with high photoluminescence intensity. The phosphor powders below 3 wt% $Li_2CO_3$ of phosphor had submicron sizes after post-treatment temperatures of $1,050^{\circ}C$ and $1,150^{\circ}C$. The photoluminescence intensity of the phosphor powders post-treated at $1,150^{\circ}C$ was 124% of that of the phosphor powders post-treated at $1,050^{\circ}C$.

키워드

참고문헌

  1. Kang, S. S., Park, J. K., Cha, B. Y., Cho, S. H., Shin, J. W., Lee, K. H. and Nam, S. H., 'Radiation Detector Based on Liquid Crystal Light Valve for Large-area Imaging Applications,' Nucl. Instr. Meth. Phys. Res. A, 576, 83-86(2007) https://doi.org/10.1016/j.nima.2007.01.125
  2. Kim, S. Y., Park, J. K., Kang, S. S., Cha, B. Y., Cho, S. H., Shin, J. W., Son, D. W. and Nam, S. H., 'Investigation of the Imaging Characteristics of the $Gd_2O_3$:Eu Nanophosphor for High-resolution Digital X-ray Imaging System,' Nucl. Instr. Meth. Phys. Res. A, 576, 70-74(2007) https://doi.org/10.1016/j.nima.2007.01.172
  3. Rao, R. P., 'Preparation and Characterization of Fine-Grain Yttrium-Based Phosphors by Sol-Gel Process,' J. Electrochem. Soc., 143, 189-197(1996) https://doi.org/10.1149/1.1836407
  4. Pan, Y., Su, Q., Xu, H., Chen, T., Ge, W., Yang, C. and Wu, M., 'Synthesis and Red Luminescence of $Pr^3+$-doped $CaTiO_3$ Nanophosphor from Polymer Precursor,' J. Solid State Chem., 174, 69-73(2003) https://doi.org/10.1016/S0022-4596(03)00175-0
  5. Oing, S., Barthou, C., Denis, J. P., Pelle, F. and Blanzat, B., 'Luminescence and Energy Transfer in $Y_2O_3$ CO-doped with $Bi^3+$ and $Eu^3+$,' J. Lumin., 28, 1-11(1983) https://doi.org/10.1016/0022-2313(83)90021-2
  6. Villalobos, G., Leclerq, O., Paris, H. and Summers, C. J., 'Controlling the Size and Shape of Co-Precipitated $Y_2O_3$:Eu Phosphors,' Ext. Abs. $3^rd$ Int' 1 Conf. Sci. & Tech. Display Phosphors, Huntington Beach, CA, pp. 253(1997)
  7. Bihari, B., Eilers, H. and Tissue, B. M., 'Spectra and Dynamics of Monoclinic $Eu_2O_3$ and $Eu^3+$: $Y_2O_3$ Nanocrystals,' J. Lumin., 75, 1-10(1997) https://doi.org/10.1016/S0022-2313(97)00102-6
  8. Xu, C., Wakins, B. A., Sievers, R. E., Jing, X., Trowga, P., Gibbons, C. S. and Vecht, A., 'Spectra and Dynamics of Monoclinic $Eu_2O_3$ and $Eu^3+$+:$Y_2O_3$ Nanocrystals,' Appl. Phys. Lett., 71, 1643-1645(1997) https://doi.org/10.1063/1.120004
  9. Roh, H. S., Kim, E. J., Kang, H. S., Kang, Y. C., Park, H. D. and Park, S. B., 'Vacuum Ultraviolet Characteristics of Nano-sized $Gd_2O_3$:Eu Phosphor Particles,' J. Appl. Phys., 42, 2741-2745(2003) https://doi.org/10.1143/JJAP.42.2741
  10. Kang, Y. C., Roh, H. S. and Park, S. B., 'Preparation of $Y_2O_3$:Eu Phosphor Particles of Filled Morphology at High Precursor Concentrations by Spray Pyrolysis,' Adv. Mater., 12, 451-453(2000) https://doi.org/10.1002/(SICI)1521-4095(200003)12:6<451::AID-ADMA451>3.0.CO;2-S
  11. Kim, E. J., Kang, Y. C., Park, H. D. and Ryu, S. K., 'UV and VUV Characteristics of (YGd)2O3:Eu Phosphor Particles Prepared by Spray Pyrolysis from Polymeric Precursors,' Mater. Res. Bull., 38, 515-524(2003) https://doi.org/10.1016/S0025-5408(02)01047-4
  12. Kang, Y. C., Roh, H. S. and Park, S. B., 'Use of LiCl Flux in the Preparation of $Y_2O_3$:Eu Phosphor Particles by Spray Pyrolysis,' J. Eur. Ceram. Soc., 22, 1661-1665(2002) https://doi.org/10.1016/S0955-2219(01)00462-9
  13. Lee, K. K., Jung K. Y., Kim, J. H., Koo, H. Y., Ju, S. H. and Kang, Y. C., 'Characteristics of Crystallinity and Morphology of Barium Titanate Particles Prepared by Spray Pyrolysis,' Koren Chem. Eng. Res., 43(4), 517-524(2005) https://doi.org/10.1140/epjb/e2005-00085-7
  14. Kim, D. Y., Ju, S. H., Koo, H. Y., Hong, S. K. and Kang, Y. C., 'Synthesis of Nanosized $Go_3O_4$ Particles by Spray Pyrolysis,' J. Alloy. Compd., 417, 254-258(2006) https://doi.org/10.1016/j.jallcom.2005.09.013
  15. Jung, D. S., Lee, S. H., Han, J. M., Hwang, H. J., Lee, J. H. and Kang, Y. C., 'Microstructure and Electrical Properties of Nanosized $Ce_1-xGd_xO_2$ ($0\leqx\leq{0.2}$) Particles Prepared by Spray Pyrolysis,' J. Ceram. Soc. Jpn., 116(9), 969-974(2008) https://doi.org/10.2109/jcersj2.116.969
  16. Lee, K. K., Kang, Y. C., Jung, K. Y. and Kim, J. H., 'Preparation of Nano-sized $BaTiO_3$ Particle by Citric Acid-assisted Spray Pyrolysis,' J. Alloy. Compd., 395, 280-285(2005) https://doi.org/10.1016/j.jallcom.2004.11.033