Enhanced up-conversion photoluminescence and dielectric properties of Er- and Zr-codoped strontium bismuth niobate ceramics
Enhanced up-conversion photoluminescence and dielectric properties of Er- and Zr-codoped strontium bismuth niobate ceramics
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DOI：
10.1016/j.ceramint.2015.06.067
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发表时间：
2015-11
影响因子：
5.2
通讯作者：
T. Wei;Xiuzhang Wang;C. Zhao;T. Zhang;Fengming Yang;Weibo Wang;Y. Ma
中科院分区：
文献类型：
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作者：
T. Wei;Xiuzhang Wang;C. Zhao;T. Zhang;Fengming Yang;Weibo Wang;Y. Ma
采用固相反应法合成了不同x（0≤x≤ 0. 1）的Er、Zr共掺杂SrNbO_3陶瓷Sr 0. 97 Er 0. 03 Bi 2Nb 2 − xZrxO_9（SBNx）。它们的结构，上转换（UC）的光致发光，和介电性能进行了研究。通过Rietveld结构精修，所有SBNx样品均表现出空间群为A21 am的多晶铋层状钙钛矿结构。通过在铋层状钙钛矿结构中引入Zr 4+离子，SBNx样品同时表现出增强的UC光致发光和介电性能。研究了Zr ~（4+）浓度和入射泵浦功率对UC光致发光的影响。在980 nm近红外（NIR）激发下，观察到明亮的UC绿色和微弱的红光发射，分别对应于2 H 11/2/4 S 3/2和4 F 9/2到4 I 15/2能级的跃迁。随着x的增加，掺Er ~（3+）激活剂SBNx的UC发光增强，这是由于Zr ~（4+）和Nb ~（5+）离子半径不同引起的Er ~（3+）激活剂周围晶场的局部畸变所致。泵浦功率对UC发光强度的影响表明，UC的绿色和红色发光都涉及到双光子能量转移过程。电性能测试结果表明，Zr ~（4+）的引入使SBNx陶瓷的铁电-顺电相变温度从724 K提高到762 K，而Zr ~（4+）的引入使SBNx陶瓷的铁电-顺电相变温度从0.0提高到0.1。认为大Zr ~（4+）离子对SBN_x进行B位掺杂是改善这种潜在的多功能光电材料的UC发光和电学性能的有效方法。
Er- and Zr-codoped strontium bismuth niobate ceramics, Sr0.97Er0.03Bi2Nb2−xZrxO9(SBNx) with differentx(0≤x≤0.1), were synthesized by the solid state reaction method. Their structural, up-conversion (UC) photoluminescence, and dielectric properties were investigated. By Rietveld structural refinement, all SBNxsamples exhibited a polycrystalline bismuth-layered perovskite structure with space group A21am. With deliberate introduction of Zr4+ions in the bismuth-layered perovskite structure, SBNxsamples presented simultaneously enhanced UC photoluminescence and dielectric properties. The UC photoluminescence was investigated as a function of Zr4+concentration and incident pump power. Under the 980 nm near infrared (NIR) excitation, bright UC green and weak red emissions were observed which corresponded to the transitions from2H11/2/4S3/2and4F9/2to4I15/2level, respectively. Withxincrease, the UC luminescence improvement of SBNxcan be attributed to the local distortion of crystal field surrounding the Er3+activator which induced by different ionic radii of Zr4+and Nb5+ions. The dependence of UC emission intensity on pumping power showed that two photon energy transfer process was involved in the UC green and red emissions. Furthermore, electrical measurements indicated that the introduction of Zr4+distinctly increased the ferroelectric to paraelectric phase transition temperature (TC) of SBNxceramics from 724 K to 762 K asxranging from 0.0 to 0.1. It is believed that B site doping in SBNxby large Zr4+ion is an effective method to improve UC luminescence and electrical properties of this potentially multifunctional optical-electro material.