Photoluminescence and electrical properties of Eu3+-doped Na0.5Bi4.5Ti4O15-based ferroelectrics under blue light excitation

Xing-an JIANG , Xiang-ping JIANG , Chao CHEN , Na TU , Yun-jing CHEN , Ban-chao ZHANG

Front. Mater. Sci. ›› 2016, Vol. 10 ›› Issue (1) : 31 -37.

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Front. Mater. Sci. ›› 2016, Vol. 10 ›› Issue (1) : 31 -37. DOI: 10.1007/s11706-016-0328-x
RESEARCH ARTICLE
RESEARCH ARTICLE

Photoluminescence and electrical properties of Eu3+-doped Na0.5Bi4.5Ti4O15-based ferroelectrics under blue light excitation

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Abstract

Na0.5Bi4.5--xEuxTi4O15 (NBT--xEu3+) ceramics with x=0, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30 and 0.40 were prepared by conventional ceramics processing. NBT--0.25Eu3+ ceramics show the strongest red and orange emissions corresponding to the 5D07F2 (617 nm) and 5D07F1 (596 nm) transitions, respectively. The strongest excitation band around 465 nm matches well with the emission wavelength of commercial InGaN-based blue LED chip, indicating that Eu3+-doped NBT ceramics may be used as potential environmental friendly red-orange phosphor for W-LEDs application. As an inherent ferroelectric and piezoelectric material, the electrical properties of this potentially multifunctional electro-optical material have been also studied. The introduction of Eu3+ distinctly increased the Curie temperature (TC) of NBT--xEu3+ ceramics from 640°C to 711°C as x ranges from 0 to 0.40. For higher temperature applications, the electrical conductivity was also investigated. The conduction of charge carriers in high-temperature range originates from the conducting electrons from the ionization of oxygen vacancies. High TC and low tanδ makes Eu3+-doped NBT ceramic also suitable for high temperature piezoelectric sensor applications and electro-optical integration.

Keywords

Aurivillius bismuth layered structure / photoluminescence / electrical properties / multifunctional materials

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Xing-an JIANG, Xiang-ping JIANG, Chao CHEN, Na TU, Yun-jing CHEN, Ban-chao ZHANG. Photoluminescence and electrical properties of Eu3+-doped Na0.5Bi4.5Ti4O15-based ferroelectrics under blue light excitation. Front. Mater. Sci., 2016, 10(1): 31-37 DOI:10.1007/s11706-016-0328-x

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