액상법을 이용한 구상의 Sr4Al14O25:Eu2+ 형광체의 합성 및 발광 특성

이정; 최성호; 남산; 정하균; Jeong Lee; Sungho Choi; Sahn Nahm; Ha-Kyun Jung

Korean Journal of Materials Research, Vol.24, No.7, 351-356, July, 2014

DOI10.3740/MRSK.2014.24.7.351 Export Citation

액상법을 이용한 구상의 Sr4Al14O25:Eu2+ 형광체의 합성 및 발광 특성

Preparation and Luminescence Properties of Spherical Sr4Al14O25:Eu2+ Phosphor Particles by a Liquid Synthesis

이정^{1, 2}, 최성호¹, 남산 ², 정하균^{1, 3, †}

¹한국화학연구원 화학소재연구본부
²고려대학교 신소재공학과
³과학기술연합대학원대학교

Jeong Lee^{1, 2}, Sungho Choi¹, Sahn Nahm², and Ha-Kyun Jung^{1, 3, †}

¹Advanced Materials Division, Korea Research Institute of Chemical Technology, Yuseong-gu, Daejeon 305-600, Korea
²Korea University, Seongbuk-gu, Seoul 136-701, Korea
³Korean University of Science and Technology, Yuseong-gu, Daejeon 305-350, Korea

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A spherical Sr4Al14O25:Eu2+ phosphor for use in white-light-emitting diodes was synthesized using a liquid-state reaction with two precipitation stages. For the formation of phosphor from a precursor, the calcination temperature was 1,100 oC. The particle morphology of the phosphor was changed by controlling the processing conditions. The synthesized phosphor particles were spherical with a narrow size-distribution and had mono-dispersity. Upon excitation at 395 nm, the phosphor exhibited an emission band centered at 497 nm, corresponding to the 4f65d→4f7 electronic transitions of Eu2+. The critical quenching-concentration of Eu2+ in the synthesized Sr4Al14O25:Eu2+ phosphor was 5 mol%. A phosphorconverted LED was fabricated by the combination of the optimized spherical phosphor and a near-UV 390 nm LED chip. When this pc-LED was operated under various forward-bias currents at room temperature, the pc-LED exhibited a bright blue-green emission band, and high color-stability against changes in input power. Accordingly, the prepared spherical phosphor appears to be an excellent candidate for white LED applications.

Keywords:Sr4Al14O25:Eu2+;co-precipitation;shape control

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[3] Schlotter P, Schmidt R, Schneider J, Appl. Phys. Mater. Sci. Process., 64(4), 417 (1997)

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[10] Smets B, Rutten J, Hoeks G, Verlijsdonk J, J. Electrochem. Soc., 136(7), 2119 (1989)

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