Enhanced piezoelectric performance and orange-red emission of Sm³⁺ doped (Na_1/2Bi_1/2)TiO₃ based lead-free ceramics

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• 作者：Xiang Xia ; ^{xiaxiang35@163.com" class="auth_mail" title="E-mail the corresponding author} ; Xiangping Jiang ; ^{jiangxp64@163.com" class="auth_mail" title="E-mail the corresponding author} ; Chao Chen ; Xingan Jiang ; Yunjing Chen ; Na Tu ; Yuhan Luo ; Yalin Jiang
• 关键词：D. Lead-free ceramics ; 0.94(Na1/2Bi1/2)TiO3-0.06BaTiO3 ; C. Piezoelectric ; Photoluminescence
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：376-384
• 全文大小：2225 K

文摘

In this work, a novel lead-free multifunctional material, 0.94(Na_1/2Bi_1/2)TiO₃-0.06BaTiO₃-xSm³⁺(NBBT-xSm), was synthesized by a conventional solid-state reaction method. The crystal structure, electrical and photoluminescence properties of the samples were systematically investigated. It was found that doping Sm³⁺ into NBBT induced a transition from the rhombohedral and tetragonal phases coexistence to a pseudocubic phase. The sample with x=0.003 displayed a relatively large piezoelectric constant (d₃₃~202 pC/N), indicating that a small amount of Sm³⁺ doping significantly improved the piezoelectric performances for NBBT ceramics. Furthermore, the obtained Sm³⁺ doped NBBT ceramics exhibited the strongest absorption peak located at 407 nm, which matches well with the emission wavelength of the commercial near-ultraviolet LED chips. Under the excitation of 407 nm n-UV light, the ceramics presented characteristic emission of Sm³⁺ ions with the dominate orange-red emission peak at 598 nm. Particularly, the quantum yield as high as 44% was achieved in the NBBT-0.006Sm specimen, which is higher than that of the most of currently reported rare earth doped ferro/piezoelectric ceramics. In addition, the thermal stability of photoluminescence for the sample was studied in detail and the value of the thermal quenching active energy was calculated to be 0.5543 eV. These results showed that NBBT-xSm materials have promising potential in white light emitting diodes (WLEDs) or advanced multifunctional devices.