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Insights into excellent persistent luminescence and detecting trap distribution in BaHfSi3O9:Eu2+,Pr3+

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Abstract

A barizite-like compound BaHfSi3O9 (BHS) was tailored to emit intense bluish green persistent luminescence (PersL) above the recognizable intensity level (≥0.32 mcd m−2) lasting for more than 12 h through codoping with Eu2+ and Pr3+. X-ray powder diffraction, the crystal and electronic structures, photoluminescence (PL) and photoluminescence excitation (PLE) were basically studied. Furthermore, decay curves, as well as thermo-luminescence (TL) spectra, were systematically carried out to clarify the mechanism of the PersL. We used the excitation duration, decay duration and excitation temperature dependent TL experiments to estimate the trap density distribution in BHS:Eu2+,Pr3+ phosphor. Based on the above measurements, the Image ID:c7tc03579a-t1.gif positive defects could be responsible for the bluish green PersL at room temperature. In the process of PersL, the electrons captured by shallow traps transfer to the Eu2+ levels through a conduction band (CB) which leads to a rapid decay in the early decay stage (t < 3 h), whereas the electrons trapped by deep traps through a quantum tunnelling process result in much slower and nonexponential decay behavior in the later slow-decay stage (t > 3 h). A possible mechanism is proposed for the PersL process in BHS:Eu2+,Pr3+ phosphor.

Graphical abstract: Insights into excellent persistent luminescence and detecting trap distribution in BaHfSi3O9:Eu2+,Pr3+

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Publication details

The article was received on 08 Aug 2017, accepted on 30 Oct 2017 and first published on 01 Nov 2017


Article type: Paper
DOI: 10.1039/C7TC03579A
Citation: J. Mater. Chem. C, 2017, Advance Article
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    Insights into excellent persistent luminescence and detecting trap distribution in BaHfSi3O9:Eu2+,Pr3+

    H. Guo, Y. Wang, G. Li, J. Liu, P. Feng and D. Liu, J. Mater. Chem. C, 2017, Advance Article , DOI: 10.1039/C7TC03579A

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