电子铁电体Er_{1-x} Yb_xFe_2O_4的光致发光
Photoluminescence in electronic ferroelectric Er_{1-x}Yb_xFe_2O_4
摘要：
通过对Er_（1-x）Yb_xFe_2 O_4（x=0，0.8，0.9和0.95）的光致发光研究，观察到了与R离子置换几乎无关的强Stark分裂。最初研究了多个辐射衰变通道，特别是可见跃迁4F_（9/2）→> 4 I_（15/2），观察到了它的猝灭效应。一系列小的非拉曼峰已被观察到叠加在宽带光致发光光谱，其中我们暂时指定斯塔克分裂的原因。4F_（9/2）和4 I_（15/2）能级的分裂分别为54 meV和66 meV。这种异常大的斯塔克分裂在可见光范围内表明存在强的本地字段起源于W层的电荷受挫ErFe 2 O 4。
英文摘要：
Strong Stark splitting, which is nearly independent of the R-ions replacement, has been observed through the photoluminescence investigation of electronic ferroelectric Er1-xYbxFe2O4 (x=0, 0.8, 0.9 and 0.95). Initially multiple radiative decay channels have been investigated, especially the visible transition 4F9/2-->4I15/2, of which a quenching effect has been observed. A series of small non-Raman peaks have been observed superimposed on a broadband photoluminescence spectrum, of which we tentatively assign Stark splitting to be the cause. The splitting of the 4F9/2 and 4I15/2 levels is found to be 54meV and 66meV, respectively. This unusually large Stark splitting at visible range indicates the existence of strong local field originated from the W-layer in the charge-frustrated ErFe2O4.
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