Tunable photoluminescence properties of Pr³⁺/Er³⁺-doped 0.93Bi_0.5Na_0.5TiO₃-0.07BaTiO₃ low-temperature sintered multifunctional ceramics

详细信息    查看全文

• 作者：Xiao Wu ; Tat Hang Chung ; Hailing Sun ; K.W. Kwok ; ^{apkwkwok@polyu.edu.hk" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Doped BNTBT ; Photoluminescence ; Energy transfer ; Ferroelectrics ; Multifunction
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：42
• 期：8
• 页码：9899-9905
• 全文大小：2702 K

文摘

Pr³⁺/Er³⁺-doped 0.93Bi_0.5Na_0.5TiO₃–0.07BaTiO₃ ceramics have been fabricated at a low sintering temperature of 960°C using a sintering aid of Li₂CO₃. The effects of energy transfer between Pr³⁺and Er³⁺on their photoluminescence properties have been investigated. Our results reveal that the down-conversion emissions of Pr³⁺are weakened and the lifetimes are shortened by the co-doping of Er³⁺. As a result, when both Pr³⁺and Er³⁺are excited simultaneously, with increasing the concentration of Er³⁺, the green emissions from Er³⁺increase but the red emissions from Pr³⁺decrease. Moreover, the emission color of the ceramics can be reversibly changed between red, yellow and yellowish green by using excitation sources of different wavelengths. Strong up-conversion green emissions with short lifetimes arisen from Er³⁺have also been observed for the ceramics under the excitation of 980 nm. Owing to the Li₂CO₃ sintering aid, the low-temperature sintered ceramics also exhibit reasonably good ferroelectric and piezoelectric properties, and hence should be promising for multifunctional applications such as electro-optical coupling devices.