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Photoluminescence of (La,Eu)2O2SO4 red-emitting phosphors derived from layered hydroxide

  • Xuejiao Wang (a1), Ji-Guang Li (a1), Qi Zhu (a2) and Xudong Sun (a2)

Abstract

Red-emitting (La,Eu)2O2SO4 phosphors have been successfully prepared using the layered hydroxide of (La,Eu)2(OH)4SO4·2H2O as the precursor. The precursor compound was firstly crystallized via hydrothermal reaction (100 °C and pH = 9.0) as well-dispersed nanoplates, followed by dehydration and dehydroxylation in the 400–1200 °C temperature range in ambient air to yield (La,Eu)2O2SO4. The phosphors show intense red emissions originated from the ff transitions of Eu3+, dominantly peaking at 617 nm, under O–Eu charge transfer excitation at 284 nm. The optimal Eu3+ content was experimentally determined to be 5 at.%, agreeing well with theoretical analysis, and the concentration quenching of luminescence was suggested to be due to exchange interactions. Fluorescence decay analysis indicates that a higher calcination temperature or Eu3+ content would decrease the lifetime of the 617 nm emission.

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a) Address all correspondence to this author. e-mail: LI.Jiguang@nims.go.jp

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Photoluminescence of (La,Eu)2O2SO4 red-emitting phosphors derived from layered hydroxide

  • Xuejiao Wang (a1), Ji-Guang Li (a1), Qi Zhu (a2) and Xudong Sun (a2)

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