Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effect of Different Fluxes in Preparation of Y2O3:Eu3+ Red Phosphor Used for Cold Cathode Fluorescence Lamp

냉 음극 형광 램프용 Y2O3:Eu3+ 적색 형광체에 대한 이종 Flux 혼합첨가의 영향

  • Goo, Ja-In (Division of Materials Science and Engineering, Pusan National University) ;
  • Kim, Sang-Moon (Division of Materials Science and Engineering, kumoh National Institute of Technology) ;
  • Shin, Hag-Ki (Department of Applied Chemistry, Kyungnam College University of Information & Technology) ;
  • Hong, Hong-Chae (Division of Materials Science and Engineering, Pusan National University) ;
  • Yoon, Seog-Young (Division of Materials Science and Engineering, Pusan National University)
  • 구자인 (부산대학교 재료공학부) ;
  • 김상문 (금오공과대학교 신소재시스템공학부) ;
  • 신학기 (경남정보대학 신소재 응용화학과) ;
  • 박홍채 (부산대학교 재료공학부) ;
  • 윤석영 (부산대학교 재료공학부)
  • Published : 2009.03.27
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Abstract

$Eu^{3+}$-doped $Y_2O_3$ red phosphor was synthesized in a flux method using the chemicals $Y_2O_3,\;Eu_2O_3,\;H_3BO_3$ and $BaCl_2{\cdot}2H_2O$. The effect of a flux addition on the preparation of $Y_2O_3:Eu_{3+}$ red phosphor used as a cold cathode fluorescence lamp was investigated. $H_3BO_3$ and $BaCl_2{\cdot}2H_2O$ fluxes were used due to their different melting points. The crystallinity, thermal properties, morphology, and emission characteristics were measured using XRD, TG-DTA, SEM, and a photo-excited spectrometer. Under UV excitation of 254 nm, $Eu_2O_3$ 3.7 mol% doped $Y_2O_3$ exhibited a strong narrow-band red emission, peaking at 612 nm. From this result, the phosphor synthesized by firing $Y_2O_3$ with 3.7 mol% of $Eu_2O_3$, 0.25 mol% of $H_3BO_3$ and 0.5 mol% of $BaCl_2{\cdot}2H_2O$ fluxes at $1400^{\circ}C$ for 2 hours had a larger particle size of $4{\mu}m$ on average compared to the phosphor of the $H_3BO_3$ flux alone. In addition, a phosphor synthesized by the two fluxes together had a rounder corner shape, which led to the maximum emission intensity.

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