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2019 Vol.29, Issue 9 Preview Page
Effects of Flux and Ta5+ Substitution on the Photoluminescence of Lu(Nb,Ta)O4:Eu3+ Phosphors

융제 및 Ta5+ 치환이 Lu(Nb,Ta)O4:Eu3+ 형광체의 발광 특성에 미치는 영향

Jiwon Kim
,
Young Jin Kim†
김 지원
,
김 영진†
Department of Advanced Materials Engineering, Kyonggi University, Suwon 16227, Republic of Korea
경기대학교 신소재공학과
†Corresponding author E-Mail : yjkim@kgu.ac.kr (Y. J. Kim, Kyonggi Univ.)
September 2019. pp. 559-566
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Abstract

Lu(Nb,Ta)O4:Eu3+ powders are synthesized by a solid-state reaction process using LiCl and Li2SO4 fluxes. The photoluminescence (PL) excitation spectra of the synthesized powders consist of broad bands at approximately 270 nm and sharp peaks in the near ultraviolet region, which are assigned to the Nb5+-O2− charge transfer of [NbO4]3− niobates and the f-f transition of Eu3+, respectively. The PL emission spectra exhibit red peaks assigned to the 5D0 → 7FJ transitions of Eu3+. The strongest peak is obtained at 614 nm (5D0 → 7F2), indicating that the Eu3+ ions are incorporated into the Lu3+ asymmetric sites. The addition of fluxes causes the increase in emission intensity, and Li2SO4 flux is more effective for enhancement in emission intensity than is LiCl flux. The substitution of Ta5+ for Nb5+ results in an increase or decrease in the emission intensity of LuNb1-xTaxO4:Eu3+ powders, depending on amount and kind of flux. The findings are explained using particle morphology, modification of the [NbO4]3− structure, formation of substructure of LuTaO4, and change in the crystal field surrounding the Eu3+ ions.

Keywords
LuNbO4
luminescence
phosphor
flux
tantalum
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 29
  • No :9
  • Pages :559-566
  • Received Date : 2019-08-07
  • Revised Date : 2019-08-07
  • Accepted Date : 2019-09-02
  • DOI :https://doi.org/10.3740/MRSK.2019.29.9.559
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