Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Synthesis and Luminescent Characteristics of Sr4Al14O25 Phosphor

Sr4Al14O25 형광체의 합성과 발광특성

  • Han Sang Hyuk (Department of Materials Science and Engineering, Kyonggi University) ;
  • Kim Young Jin (Department of Materials Science and Engineering, Kyonggi University)
  • Published : 2004.08.01
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Abstract

$Sr_{4}Al_{14}O_{25}$ was synthesized by solid state reaction with flux. $H_{3}BO_3$ was used to synthesize $SrO-Al_{2}O_{3}$ phosphor system as a flux. The effect of doping system such as Eu+Dy, Eu, and Ce on the luminescent properties of $Sr_{4}Al_{14}O_{25}$ was investigated. Both PL spectra of $Sr_{4}Al_{14}O_{25}$:Eu and $Sr_{4}Al_{14}O_{25}$:Eu+Dy excited at 390 nm showed greenish-blue emission at about 490 nm, while the emission wavelength was shifted to 400 nm by doping Ce. The reduction of $Eu^{3+}$ ions to $Eu^{2+}$ could be accomplished by the annealing process under $N_{2}^{+}$ vacuum atmosphere, and attributed to the emission at 490 nm. It is verified that $Sr_{4}Al_{14}O_{25}$:Eu phosphor is suitable for white LEDs became of a broad absorption band peaking at 390 nm.

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