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

Published online by Cambridge University Press:  30 May 2016

Xuejiao Wang ,
Ji-Guang Li ,
Qi Zhu  and
Xudong Sun
Xuejiao Wang
Affiliation:
Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China; and Advanced Materials Processing Unit, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
Ji-Guang Li*
Affiliation:
Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China; and Advanced Materials Processing Unit, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
Qi Zhu
Affiliation:
Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China
Xudong Sun
Affiliation:
Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China
*
a) Address all correspondence to this author. e-mail: LI.Jiguang@nims.go.jp
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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 f–f 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.

Keywords

phase transformationluminescencelayered

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Articles
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Journal of Materials Research , Volume 31 , Issue 15 , 15 August 2016 , pp. 2268 - 2276
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Copyright © Materials Research Society 2016 

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