Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지
DOI QR코드

DOI QR Code

Hydrothermal Synthesis of Ultra-fine SrAl2O4:Eu Powders and Investigation of their Photoluminescent Characteristics

수열합성법에 의한 SrAl2O4:Eu 초미세 분말 합성공정 및 형광 특성

  • 박우식 (서울시립대학교 신소재공학과) ;
  • 김선재 (세종대학교 나노기술연구) ;
  • 김정식 (서울시립대학교 신소재공학과)
  • Published : 2004.05.01
Download PDF
⟨ Previous Next ⟩

Abstract

Sr$_{l-x}$Ba$_{x}$Al$_2$O$_4$:Eu (x = 0, 0.1, 0.2, and 0.3 mol) phosphor was synthesized by the hydrothermal method and its properties of photoluminescence and long-afterglow were investigated. The mixtures of Sr(NO$_3$)$_2$, Al(NO$_3$)$_3$9$H_2O$, and Eu(NO$_3$)$_3$$.$6$H_2O$ salts dissolved in distilled water, after controlling their pH by NH$_4$OH solution, put into an Autoclave reactor with high temperature and pressure to react. Such synthesized SrAl$_2$O$_4$:Eu powders showed homogeneous and ultra-fine particles of sub-micron size. In order to have the photoluminescence characteristic, powders were heat treated at 1100 -140$0^{\circ}C$ for 2 h in Ar/H$_2$ reduction atmosphere. Photoluminescence spectra showed a excitation along the wide wavelength of 250 ∼ 450 nm, and broaden emission with maxima peak at 520 nm. Also, it showed a good long afterglow with decaying over 1000 sec after excitation illumination for 10 min. In addition, the microstructure and crystal structure of SrAl$_2$O$_4$:Eu powders were investigated by an SEM and XRD, respectively.

본 연구에서는 수열합성법으로 SrAl$_2$O$_4$:Eu 형광체 분말을 합성하여 이들의 발광 특성과 장잔광 특성 등에 대해서 고찰하였다. 증류수에 Sr(NO$_3$)$_2$, Al(NO$_3$)$_3$ㆍ9$H_2O$, Eu(NO$_3$)$_3$$.$6$H_2O$ 등의 금속염을 용해시킨 용액을 NH$_4$OH 수용액으로 pH 률 적당히 조절하고 고온고압의 Autoclave 반응용기 내에서 반응시켰다. 이렇게 합성된 분말은 균일한 입도 분포를 나타내었으며, sub-micron 크기의 초미세 분말이었다. 합성된 SrAl$_2$O$_4$:Eu 초미세 분말을 Ar-H$_2$ 가스 환원분위기에서 1100 -140$0^{\circ}C$ 온도로 2시간동안 열처리시켜서 형광 특성을 나타내도록 만들었다. 분말의 여기 및 발광 특성을 측정한 결과, 발광파장을 520 nm 로 고정시켜 측정한 여기스펙트럼은 250 ∼ 450 nm 의 넓은 파장영역에 걸쳐 여기가 일어났고, 발광스펙트럼은 520 nm에서 최대 피크를 나타내었다. 또한 10분간 여기시킨 후 520 nm 파장에 대한 잔광 특성이 1000초 이상 지속되는 우수한 장잔광 특성을 나타내었다. 그 밖에 SEM, XRD를 이용하여 SrAl$_2$O$_4$:Eu 형광체 분말에 대한 미세구조 및 결정구조를 고찰하였다.

Keywords

References

  1. Mater. Lett. Combustion Synthesis and Photoluminescence of SrAl$_2O_4$ Eu, Dy Phosphor Nanoparticles T. Peng;H. Yang;X. Pu;B. Hu;Z. jiang;C. Yan https://doi.org/10.1016/S0167-577X(03)00499-3
  2. Opt. Mater. v.20 Effect of Cu$^{2+}$ Ions on the Photoluminescence Characteristics of Ce$^{4+}$-Doped Sral$_2$O$_4$ P. Yang;M. K. Lu;C. F. Song;D. Xu;D. R. Yuan;D. X. Cao;F. Gu https://doi.org/10.1016/S0925-3467(02)00059-9
  3. J. Alloys and Comp. v.354 Role of B$_2$O$_3$ on the Phase Stability and Long Phosphorescence of SrAl$_2$O$_4$:Eu, Dy A. Nag;T. R. N. Kutty https://doi.org/10.1016/S0925-8388(03)00009-4
  4. Inorg. Chem. Comm. v.5 Photoluminescence Characteristics and Mechanism of SrAl$_2O_4$ Co-Doped with Eu$^{3+}$and Cu$^{2+}$ P. Yang;M. K. Lu;C. F. Song;D. Xu;D. R. Yuan;G. M. Xia;S. W. Liu https://doi.org/10.1016/S1387-7003(02)00601-9
  5. Mater. Sci. Eng. v.B96 Sensitized Luminescence from Sol-Gel-Derived SrAl$_2O_4$ Co-Doped with Cu$^{2+}$and Dy$^{3+}$ P. Yang;M. K. Lu;D. Xu;D. R. Yuan;C. F. Song;Z. Q. Liu;D. H. Chen
  6. Kor. J. Mater. Res. v.8 no.11 Effect of B$_2$$O_3$ Addition on Synthesis of Long Phosphorescent SrAl$_2O_4$:Eu$^{2+}$, Dy$^{3+}$ Phosphor Y.-K. Lee;B.-G. Kim;C.-W. Nam
  7. J. Kor. Assoc. Cryst. Growth v.8 no.3 Effect of Dy$_2$$O_3$ Coposition for the Photoluminescence and Long-Photoluminescent Characteristics of Stuffed Tridymite SrAl$_2O_4$:Eu$^{2+}$ Phosphor Y.-K. Lee;B.-G. Kim
  8. J. Mater. Chem. v.5 no.9 Synthesis and Characterization of Ultrafine Ni(II)-Bearing Ferrites ($Ni_x$$Fe_{3-x}$$O_4$, x=0.14-1.0) T. Kodama;Y. Wada;T. Yamamomo;M. Tsuji;Y. Tamura https://doi.org/10.1039/jm9950501413
  9. Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing C. J. Brinker;G. W. Scherer
  10. J. Kor. Ceram. Soc. v.37 no.10 $CO_2$ Decomposition Properties of Ternary Ferrites Synthesized by The Wet Processing J.-R. Ahn;D.-S. Bae;J.-S. Kim
  11. J. Mater. Chem. v.11 no.12 Morphological Properties of Ultra-Fine (Ni,Zn)-Ferrites and their Ability to Decompose $Co_2$ J.-S. Kim;J.-R. Ahn;C. W. Lee;Y. Murakami;D. Shindo https://doi.org/10.1039/b103890g
  12. Kor. J. Mater. Res. v.8 no.8 Synthesis and After-Grow Characteristics of Eu Activated Sr-Al-O Long Phosphorescent Phosphor Y.-K. Lee;J.-Y. Kim;B.-K. Kim;Y.-T. Yu
  13. J. Euro. Ceram. Soc. v.23 Crystallisation of Spray-Dried Amorphous Precursors in the SrO-Al$_2O_3$ System: A DSC Study A. Douy;M. Capron https://doi.org/10.1016/S0955-2219(03)00015-3
  14. Luminescent Materials G. Blasse;B. C. Grabmaier
  15. J. Electrochem. Soc. v.143 no.8 New Long Phosphorescent Phosphor with High Brightness SrAl$_2O_{4-}$$Eu^{2+}$, $Dy^{3+}$ T. Matsuzawa;Y. Aoki;N. Takeuchi;Y. Murayama https://doi.org/10.1149/1.1837067