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

The Korea Association of Crystal Growth (한국결정성장학회)
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Synthesis and photoluminescence characteristics of SrAl2O4:Mn4+ phosphor for LED applications

LED용 SrAl2O4:Mn4+ 형광체 합성 및 발광특성 연구

  • Byoung Su Choi (Department of Nano Fusion Technology, Pusan National University) ;
  • Jun Ho Lee (Department of Nanomechatronics Engineering, Pusan National University) ;
  • Sungu Hwang (Department of Nanomechatronics Engineering, Pusan National University) ;
  • Jin Kon Kim (Department of Nanomechatronics Engineering, Pusan National University) ;
  • Byeong Woo Lee (Department of Ocean Advanced Materials Convergence Engineering, Korea Maritime & Ocean University) ;
  • Hyun Cho (Department of Nanomechatronics Engineering, Pusan National University)
  • 최병수 (부산대학교 나노융합기술학과) ;
  • 이준호 (부산대학교 나노메카트로닉스공학과) ;
  • 황승구 (부산대학교 나노메카트로닉스공학과) ;
  • 김진곤 (부산대학교 나노메카트로닉스공학과) ;
  • 이병우 (한국해양대학교 해양신소재융합공학과) ;
  • 조현 (부산대학교 나노메카트로닉스공학과)
  • Received : 2023.01.19
  • Accepted : 2023.02.13
  • Published : 2023.02.28
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Abstract

A non-rare earth-based strontium-aluminate red light emitting phosphor was synthesized by a solid-state reaction method and the effect of synthesis temperature and Mn4+ activator concentration on the photoluminescence characteristics of the phosphor was studied. The synthesized SrAl2O4:Mn4+ phosphor showed broad band absorption characteristics in the near-ultraviolet and blue regions with peaks at wavelengths of near 330 and 460 nm, and a triple band deep red emission consisted of three peaks at near 644, 658, and 673 nm. The SrAl2O4:Mn4+ phosphor synthesized at a temperature 1600℃ and a Mn4+ activator concentration of 0.5 mol% showed the strongest PL emission intensity, and concentration quenching was observed at concentrations higher than 0.7 mol%. FE-SEM and DLS particle size distribution analysis showed that the synthesized SrAl2O4:Mn4+ phosphor had a particle size distribution of 2~6.4 ㎛ and an irregular spherical shape with an average particle size of ~4 ㎛.

LED용 비희토류 기반 strontium-aluminate 계 적색 발광 형광체를 고상반응법으로 합성하였고, 합성온도 및 Mn4+ 활성제 첨가량이 형광체의 발광특성에 미치는 영향에 대하여 조사하였다. 합성된 SrAl2O4:Mn4+ 형광체는 330 및 460 nm 근처 파장에서 피크가 나타나는 근자외선 및 청색 영역의 광대역 흡광 특성과 644, 658, 및 673 nm 근처의 세 개의 피크로 이루어진 삼중밴드 형태의 deep red 발광 특성을 나타내었다. 합성온도 1600℃, 0.5 mol% Mn4+ 이온 첨가량에서 합성된 SrAl2O4:Mn4+ 형광체가 가장 우수한 발광 특성을 나타내었고, 0.7 mol% 이상의 첨가량에서는 농도소광이 관찰되었다. FE-SEM 및 DLS 입도크기분포 분석 결과 합성된 SrAl2O4:Mn4+ 형광체 2~6.4 ㎛의 입도 분포 및 불규칙한 구형을 나타내며 약 4 ㎛의 평균 입자 크기를 갖는 것으로 조사되었다.

Keywords

Acknowledgement

이 과제는 부산대학교 기본연구지원사업(2년)에 의하여 연구되었음.

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