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Open AccessArticle

AC Electroluminescent Processes in Pr3+-Activated (Ba0.4Ca0.6)TiO3 Diphase Polycrystals

by Nan Gao 1, Min Zhang 2,3 and Jun-Cheng Zhang 1,*
College of Physics, Qingdao University, Qingdao 266071, China
Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
Author to whom correspondence should be addressed.
Academic Editors: Jonathan Kitchen and Robert Elmes
Materials 2017, 10(5), 565;
Received: 24 April 2017 / Revised: 10 May 2017 / Accepted: 16 May 2017 / Published: 21 May 2017
(This article belongs to the Special Issue Luminescent Materials 2017)
We investigated the properties of alternating current (AC)-driven electroluminescence from (Ba0.4Ca0.6)TiO3:Pr3+ diphase polycrystal-based device. The results of crystal phases and micrographs, and the symmetrical dual emissions in one AC cycle, indicate the spontaneous formation of a dielectric/phosphor/dielectric sandwich microstructure in (Ba0.4Ca0.6)TiO3:Pr3+. The electroluminescent device emits a red light of 617 nm, which is attributed to the 1D2-3H4 transition of Pr3+ in the phosphor phase. At a fixed AC frequency, the intensity of electroluminescence exhibits a steep enhancement when applying an increased driving electric field that is beyond a threshold. In a fixed driving electric field, the intensity of electroluminescence shows a rapid rise at low frequencies, but reaches saturation at high frequencies. Based on a double-injection model, we discussed systematically the electroluminescent processes in a whole cycle of AC electric field, which matched well with the experimental data. Our investigation is expected to expand our understanding of such a diphase electroluminescent device, thereby promoting their applications in lighting and displays. View Full-Text
Keywords: powders; solid-state reaction; optical properties; functional applications powders; solid-state reaction; optical properties; functional applications
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MDPI and ACS Style

Gao, N.; Zhang, M.; Zhang, J.-C. AC Electroluminescent Processes in Pr3+-Activated (Ba0.4Ca0.6)TiO3 Diphase Polycrystals. Materials 2017, 10, 565.

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