【摘要】 采用传统的固相烧结法,制备了Bi_3-xEr_xTi_0.98Ta_0.02Nb_0.98W_0.02O₉（x=0,0.02,0.06,0.1,0.14,0.24）铋层状结构陶瓷.经X射线衍射（XRD）表征,新合成材料为单相结构.Er³⁺掺杂后,陶瓷样品在室温下显示出了很强的上转换发光,且随着Er³⁺掺杂含量的增多,由明亮的绿色变为黄色发光.室温时,在可见光波长范围内,有3个峰,分别为534 nm和549 nm处的绿光峰和670 nm处的红光峰,对应于Er³⁺离子的²H_11/2→⁴I_15/2,⁴S_3/2→⁴I_15/2和⁴F_9/2→⁴I_15/2跃迁.变功率条件下的发光强度.研究表明:绿光和红光发射均为双光子过程.研究结果表明:Bi_3-xEr_xTi_0.98Ta_0.02Nb_0.98W_0.02O₉是一种具有优异光学性能的新型多功能材料.更多还原

【Abstract】 Bismuth layered-structure oxides in the Bi_3-xErxTi_{0. 98}Ta_{0. 02}Nb_{0. 98}W_{0. 02}O₉ system were synthesized by the conventional solid state reaction approach. The XRD analysis showed that all the ceramics were the single phase with bismuth layered-structure structure. A bright up-conversional photoluminescence（ UC） can be measured by partially substituting Er³⁺for Bi^{3 +}. Under 980 nm radiation excitation,three emission bands located at green（ 534 nm,549 nm） and red（ 670 nm） wavelength regions were obtained at room temperature. They can be assigned to ²H_{11 /2}→⁴I_{15 /2},⁴S_{3 /2}→⁴I_{15 /2} and ⁴F_{9 /2}→⁴I_{15 /2}. The dependence of the emission intensity on the pumping power indicated that the up-conversion emission was a two-photon process. These Er³⁺doped Bi₃Ti_{0. 98}Ta_{0. 02}Nb_{0. 98}W_{0. 02}O₉ based ferroelectrics could possibly be used as a multifunctional material for a wide range of applications.更多还原