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

doi:10.1007/s11706-016-0328-x

Front. Mater. Sci.

2016, Vol. 10

Issue (1) : 31-37 https://doi.org/10.1007/s11706-016-0328-x

RESEARCH ARTICLE

Photoluminescence and electrical properties of Eu³⁺-doped Na_0.5Bi_4.5Ti₄O₁₅-based ferroelectrics under blue light excitation

Xing-an JIANG,Xiang-ping JIANG(

),Chao CHEN,Na TU,Yun-jing CHEN,Ban-chao ZHANG

Jiangxi Key Laboratory of Advanced Ceramic Materials, Department of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333001, China

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Abstract

Na_0.5Bi_4.5--_xEu_xTi₄O₁₅ (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 ⁵D₀ → ⁷F₂ (617 nm) and ⁵D₀ → ⁷F₁ (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 (T_C) 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 T_C 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

Corresponding Author(s): Xiang-ping JIANG

Online First Date: 29 December 2015 Issue Date: 15 January 2016

Cite this article:

Xing-an JIANG,Xiang-ping JIANG,Chao CHEN, et al. Photoluminescence and electrical properties of Eu³⁺-doped Na_0.5Bi_4.5Ti₄O₁₅-based ferroelectrics under blue light excitation[J]. Front. Mater. Sci., 2016, 10(1): 31-37.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-016-0328-x
https://academic.hep.com.cn/foms/EN/Y2016/V10/I1/31

Fig.1 XRD patterns of (a) NBT–xEu³⁺ (x = 0, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30 and 0.40) ceramics and (b) the amplification of the (119) diffraction peak.

Fig.2 The PLE spectra of NBT–0.25Eu³⁺ sample monitored by different emission wavelength (λ_em = 596 and 617 nm) and PL spectrum excited by 465 nm. The inset is the PL spectra of NBT–0.25Eu³⁺ sample excited by different wavelength (λ_ex = 396, 465, 525 and 536 nm).

Fig.3 The possible transition relatives to excitation and emission processes of Eu³⁺ ions.

Fig.4 Excitation and emission spectra of NBT–xEu³⁺ (x = 0, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, and 0.40).

Fig.5 The CIE chromaticity coordinates of NBT–xEu³⁺ (x = 0.05, 0.10, 0.15, 0.20, 0.25, 0.30 and 0.40).

Fig.6 Temperature dependence of dielectric constant and loss of NBT–xEu³⁺ (x = 0, 0.15, 0.25 and 0.40) ceramics.

Fig.7 Temperature dependences of σ_AC at selected frequencies for (a)x = 0 and (b)x = 0.25 ceramics. The inset shows the amplification of dielectric loss corresponding to the conductivity anomaly.

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