当前位置: X-MOL 学术Sci. Rep. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Near infrared emission properties of Er doped cubic sesquioxides in the second/third biological windows.
Scientific Reports ( IF 3.8 ) Pub Date : 2018-12-21 , DOI: 10.1038/s41598-018-36639-y
Daniel Avram 1, 2 , Ion Tiseanu 1 , Bogdan S Vasile 3 , Mihaela Florea 4 , Carmen Tiseanu 1
Affiliation  

In the recent years, there is an extensive effort concentrated towards the development of nanoparticles with near-infrared emission within the so called second or third biological windows induced by excitation outside 800-1000 nm range corresponding to the traditional Nd (800 nm) and Yb (980 nm) sensitizers. Here, we present a first report on the near-infrared (900-1700 nm) emission of significant member of cubic sesquioxides, Er-Lu2O3 nanoparticles, measured under both near-infrared up-conversion and low energy X-ray excitations. The nanoparticle compositions are optimized by varying Er concentration and Li addition. It is found that, under ca. 1500 nm up-conversion excitation, the emission is almost monochromatic (>93%) and centered at 980 nm while over 80% of the X-ray induced emission is concentrated around 1500 nm. The mechanisms responsible for the up-conversion emission of Er - Lu2O3 are identified by help of the up-conversion emission and excitation spectra as well as emission decays considering multiple excitation/emission transitions across visible to near-infrared ranges. Comparison between the emission properties of Er-Lu2O3 and Er-Y2O3 induced by optical and X-ray excitation is also presented. Our results suggest that the further optimized Er-doped cubic sesquioxides represent promising candidates for bioimaging and photovoltaic applications.

中文翻译:


第二/第三生物窗中掺铒立方倍半氧化物的近红外发射特性。



近年来,人们广泛致力于开发在所谓的第二或第三生物窗口内具有近红外发射的纳米粒子,该纳米粒子由800-1000 nm范围外的激发引起,对应于传统的Nd(800 nm)和Yb (980 nm) 敏化剂。在这里,我们提出了关于立方倍半氧化物的重要成员 Er-Lu2O3 纳米粒子的近红外(900-1700 nm)发射的第一份报告,在近红外上转换和低能 X 射线激发下测量。通过改变 Er 浓度和 Li 添加量来优化纳米粒子的组成。发现,在约。 1500 nm 上转换激发,发射几乎是单色的 (>93%),并且集中在 980 nm,而超过 80% 的 X 射线诱导发射集中在 1500 nm 附近。通过上转换发射和激发光谱以及考虑可见光到近红外范围内的多次激发/发射跃迁的发射衰减,确定了 Er - Lu2O3 上转换发射的机制。还比较了由光学和 X 射线激发引起的 Er-Lu2O3 和 Er-Y2O3 的发射特性。我们的结果表明,进一步优化的掺铒立方倍半氧化物代表了生物成像和光伏应用的有希望的候选者。
更新日期:2018-12-21
down
wechat
bug