Effects of Adding B2O3 as a Flux on Phosphorescent Properties in Synthesis of SrAl2O4 : (Eu2+, Dy3+) Phosphor

Yeon-Tae Yu; Byoung-Gyu Kim

Korean Journal of Chemical Engineering, Vol.20, No.5, 973-976, September, 2003

DOI10.1007/BF02697308 Export Citation

Effects of Adding B₂O₃ as a Flux on Phosphorescent Properties in Synthesis of SrAl₂O₄ : (Eu²⁺, Dy³⁺) Phosphor

Yeon-Tae Yu^†, and Byoung-Gyu Kim

Minerals and Materials Processing Division, Korea Institute of Geoscience and Mineral Resources, 30 Gajeong, Yuseong, Daejeon 305-350, Korea

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SrAl₂O₄ : (Eu²⁺, Dy³⁺) phosphor was prepared by solid state reaction. B₂O₅ as a flux was added in SrAl₂O₄ : (Eu²⁺, Dy³⁺) in order to accelerate a solid state reaction. In this paper, the effects of B₂O³ on the crystal structure and the phosphorescent properties of the material have been evaluated. The synthesized phosphor exhibited a broad band emission spectrum peaking at 520 nm, and the spectrum peak showed little effect by the B₂O³ contents. The maximum afterglow intensity of the SrAl₂O₄ : (Eu²⁺, Dy³⁺) phosphor was obtained at the B₂O₃ content of 5%. Adding the B₂O₃ caused uniform distortion to the crystal structure of the phosphor and resulted in reducing the lengths of a and c axes and β angle of the SrAl₂O₄ crystal. The uniform distortion was accompanied with crystal defects which can trap the holes generated by the excitation of Eu²⁺ ions. The afterglow characteristic of the SrAl₂O₄ : (Eu²⁺, Dy³⁺) phosphor was thus enhanced.

Keywords:Phosphorescent Phosphor;Strontium Aluminate;Stuffed Tridymite Structure

[References]

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[Referenced By]

[1] Cullity BD, "Elements of X-ray Diffraction," Addison-Wesley Publishing Company Inc., Reading, Massachusetts, U.S.A., 375 (1977)

[2] Harada J, Yao S, Ichimiya A, J. Phys. Soc. Jpn., 48, 1625 (1981)

[3] Hosono H, Yamazaki K, Abe Y, J. Am. Ceram. Soc., 70, 867 (1987)

[4] Ito S, Banno S, Suzuki K, Inagaki M, Yogyo-Kyokai-Shi, 87, 344 (1979)

[5] Katsumata T, Nabae T, Sasajima K, Komuro S, Morikawa T, J. Electrochem. Soc., 144(9), L243 (1997)

[6] Kutty TRN, Jarannathan R, Rao RP, Mater. Res. Bull., 25, 1355 (1990)

[7] Matsuzawa T, Aoki Y, Takeuchi N, Murayama Y, J. Electrochem. Soc., 143(8), 2670 (1996)

[8] Murayama Y, Ceram. Jpn., 32, 40 (1997)

[9] Ohshima K, Yatsuya S, Harada J, J. Phys. Soc. Jpn., 50, 3071 (1981)

[10] Takasaki H, Tanabe S, Hanada T, J. Ceram. Soc. Jpn., 104, 322 (1996)

[11] Tanabe S, Hanada T, New Ceram., 10, 27 (1996)

[12] Victor A, J. Electrochem. Soc., 118, 930 (1971)