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

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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 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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ACKNOWLEDGMENT

This work is supported in part by the National Natural Science Foundation of China (Grants No. 51172038, 51302032, and U1302272), the Fundamental Research Fund for Central Universities (Grants No. N140204002 and L1502046), and Grants-in-Aid for Scientific Research (JSPS KAKENHI No. 26420686). X.J. Wang acknowledges the financial support from the China Scholarship Council for overseas Ph. D. study.

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Wang, X., Li, JG., Zhu, Q. et al. Photoluminescence of (La,Eu)2O2SO4 red-emitting phosphors derived from layered hydroxide. Journal of Materials Research 31, 2268–2276 (2016). https://doi.org/10.1557/jmr.2016.185

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