마이크로전자및패키징학회지 (Journal of the Microelectronics and Packaging Society)

  • 제19권2호
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  • Pages.41-45
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  • 2012
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  • 1226-9360(pISSN)
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  • 2287-7525(eISSN)
한국마이크로전자및패키징학회 (The Korean Microelectronics and Packaging Society)
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백색 발광다이오드용 M-Si(Al)-O-N (M: Sr, Ca) 형광체의 합성 및 발광 특성

Synthesis and Optical Properties of M-Si(Al)-O-N (M: Sr, Ca) Phosphors for white Light Emitting Diodes

  • 이승재 (경기대학교 신소재공학과) ;
  • 이준성 (경기대학교 신소재공학과) ;
  • 김영진 (경기대학교 신소재공학과)
  • Lee, Seung-Jae (Department of Materials Science and Engineering, Kyonggi University) ;
  • Lee, Jun-Seong (Department of Materials Science and Engineering, Kyonggi University) ;
  • Kim, Young-Jin (Department of Materials Science and Engineering, Kyonggi University)
  • 투고 : 2012.06.05
  • 심사 : 2012.06.12
  • 발행 : 2012.06.30
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초록

백색 LED용 산질화물계 녹색발광 형광체를 합성하고, 광특성을 분석하였다. $SrSi_2O_{2-{\delta}}N_{2+2/3{\delta}}:Eu^{2+}$의 조성을 갖는 $SrSi_2O_2N_2:Eu^{2+}$ 경우 합성조건에 따라서 N/O비 ($\delta$)가 변하고 있었다. 수소 분위기로 $1700^{\circ}C $에서 합성된 시편이 Eu의 농도가 5 mol%일 때 $Eu^{2+}$의 $5d{\rightarrow}4f$ 전이에 의한 545 nm 근처에서의 가장 높은 녹색 발광강도를 얻을 수 있었다. $Ca_{0.5m-0.005}Yb_{0.005}Si_{12-(m+n)}Al_{m+n}O_nN_{16-n}$의 조성을 갖는 $Ca-{\alpha}-SiAlON:Yb^{2+}$는 m = 3 (n = 0.15)에서 잘 발달된 결정성과 균일한 크기를 갖는 입자를 얻을 수 있었고, 이 것이 550 nm 근처에서 가장 높은 녹색 발광을 하고 있었다.

Oxynitride green phosphors for white light emitting diodes (LEDs) were synthesized and their optical properties were evaluated. The N/O ratio ($\delta$) of $SrSi_2O_{2-{\delta}}N_{2+2/3{\delta}}:Eu^{2+}$ closely depended on the synthesizing conditions. The most excellent green emission (545 nm), which was assigned to the $5d{\rightarrow}4f$ transition of $Eu^{2+}$ ions, was achieved at the conditions of $1700^{\circ}C$, 5 mol% $Eu^{2+}$, and $H_2$ atmosphere. The well-developed $Ca-{\alpha}-SiAlON:Yb^{2+}$ particles with homogeneous size were obtained at m = 3 (n = 0.15) for the compound of $Ca_{0.5m-0.005}Yb_{0.005}Si_{12-(m+n)}Al_{m+n}O_nN_{16-n}$, resulting in the strong green emission at around 550 nm.

키워드

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