Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Luminescence properties of novel Sr-Y-Si-Oxynitride yellow phosphor for LED applications

LED용 Sr-Y-Si-계 산질화물 황색 형광체의 발광 특성

  • Jeong, Ok Geun (Department of Nano Fusion Technology, Pusan National University) ;
  • Park, Jong Cheon (Department of Nano Fusion Technology, Pusan National University) ;
  • Ryu, Jeong Ho (Department of Materials Science and Engineering, Korea National University of Transportation) ;
  • Cho, Hyun (Department of Nanomechatronics Engineering, Pusan National University)
  • 정옥근 (부산대학교 나노융합기술학과) ;
  • 박종천 (부산대학교 나노융합기술학과) ;
  • 류정호 (한국교통대학교 신소재공학과) ;
  • 조현 (부산대학교 나노메카트로닉스공학과)
  • Received : 2013.08.02
  • Accepted : 2013.08.13
  • Published : 2013.08.31
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Abstract

Novel Sr-Y-Si-Oxynitride yellow phosphors were synthesized and the effect of calcination temperature, reduction temperature and $Eu^{2+}$ concentration on their luminescence properties were studied. Optimal temperature conditions were found to be $1400^{\circ}C$ and $1300^{\circ}C$ for solid-state reaction and reduction, respectively. The synthesized $Ba_9Y_{2+y}Si_6O_{24-3y}N_{3y}:Eu^{2+}$ phosphors showed a single intense broadband emission in the range of 571~587 nm for 450 nm excitation light source. The highest luminescence intensity was obtained with Eu concentration of 3 mol% and concentration quenching was observed beyond 5 mol%. FE-SEM and PSA showed that the synthesized phosphors consists of particles with an average size of ${\sim}8.2{\mu}m$.

고상반응법으로 Ba-Y-Si-계 산질화물 황색 형광체를 합성하였고, 형광체의 발광특성에 미치는 고상반응온도, 환원 열처리 온도 및 $Eu^{2+}$ 활성제 농도의 영향에 대하여 조사하였다. 고상반응온도 $1400^{\circ}C$, 환원 열처리 온도 $1300^{\circ}C$가 최적화된 온도조건으로 조사되었다. 450 nm 파장의 여기 광원에 대하여 합성된 $Ba_9Y_{2+y}Si_6O_{24-3y}N_{3y}:Eu^{2+}$ 형광체는 571~585 nm 영역의 중심파장을 갖는 단일 발광밴드 특성을 나타내었다. 활성제 $Eu^{2+}$ 농도가 3 mol%일 때 가장 강한 발광강도가 얻어졌으며, 5 mol% 이상의 농도에서는 농도소광현상이 관찰되었다. FE-SEM 및 PSA 분석 결과 합성된 형광체는 약 $8.2{\mu}m$의 평균 입경을 갖는 것으로 확인되었다.

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References

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