Strong upconversion luminescence properties of Yb3+ and Er3+ codoped Bi4Ti3O12 ferroelectric thin films
Strong upconversion luminescence properties of Yb3+ and Er3+ codoped Bi4Ti3O12 ferroelectric thin films
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DOI：
10.1063/1.3273477
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发表时间：
2009-12
影响因子：
3.2
通讯作者：
F. Gao;Guangheng Wu;Hong Zhou;D. Bao
中科院分区：
文献类型：
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作者：
F. Gao;Guangheng Wu;Hong Zhou;D. Bao
在Er 3+和Yb 3+共掺的Bi 4 Ti 3 O 12铁电薄膜中观察到了较强的上转换绿色发光。采用化学溶液沉积法在熔融石英和Pt/TiO 2/SiO2/Si衬底上制备了薄膜。在室温下，980 nm泵浦的上转换发光光谱中，存在两个强的绿色发射带和一个弱的红色发射带，分别位于524和545 nm处和667 nm处。它们分别对应于Er ~（3+）从H ~（211）/2、S ~（43）/2和F ~（49）/2能级到基态能级I ~（415）/2的辐射弛豫。Bi 3.65 Yb 0.3 Er 0.05 Ti 3 O 12薄膜的绿色发光强度比Bi 3.95 Er 0.05 Ti 3 O 12薄膜高约30倍。讨论了薄膜的上转换发光机理。此外，在Pt/TiO 2/SiO2/Si衬底上制备的Bi3.65Yb0.3Er0.05Ti3O12铁电薄膜也具有良好的电滞回线，剩余极化（2 Pr）为28.2 μC/cm 2。该研究为构建新的综合性的生物医学系统提供了可能性。
Strong upconversion green luminescence was observed in Er3+ and Yb3+ codoped Bi4Ti3O12 ferroelectric thin films. The thin films were prepared on fused silica and Pt/TiO2/SiO2/Si substrates by chemical solution deposition method. There are two strong green emission bands centered at 524 and 545 nm and a weak red emission band centered at 667 nm in the upconversion luminescence spectra pumped by 980 nm at room temperature. They correspond to the radiative relaxation of Er3+ from H211/2, S43/2, and F49/2 levels to the ground level I415/2, respectively. Bi3.65Yb0.3Er0.05Ti3O12 thin films exhibit higher green emission intensity by a factor of about 30 compared with Bi3.95Er0.05Ti3O12 thin films. The upconversion emission mechanism of the thin films has been discussed. In addition, Bi3.65Yb0.3Er0.05Ti3O12 ferroelectric thin films on Pt/TiO2/SiO2/Si substrates also show well-defined hysteresis loops with a remnant polarization (2Pr) of 28.2 μC/cm2. This study opens the possibility of constructing new integrated ...