Providing power for miniaturized medical implants: triplet sensitization of semiconductor surfaces.
Providing power for miniaturized medical implants: triplet sensitization of semiconductor surfaces.
复制标题
为微型医疗植入物提供动力：半导体表面的三重态敏化。
DOI：
10.1098/rsta.2012.0334
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Benniston AC
中科院分区：
文献类型：
--
作者：
Benniston AC
在这里，我们认识到微型设备作为医疗诊断工具的重要性日益增长，并强调需要提供一种方便的方式，在将这些设备植入体内时为其提供动力。实现这一目标最有希望的方法之一是使用光收集设备来吸收入射白光，并将光子能量转移到嵌入设备上的微小半导体中。尽管荧光有机分子为此类太阳能收集器提供了强大的组件潜力，但我们强调过渡金属络合物提供的前景。因此，一系列扩展的双核Ru(II)/Os(II)聚(吡啶)配合物已被证明是非常有前途的非晶硅太阳能电池增敏剂。这些材料吸收高比例的可见光，而基于Ru(II)的单元具有与基于萘的桥相当的三重态能量。金属络合物将三重激子注入桥中，这反过来又被基于Os(II)的末端捕获。结果是非常有效的三重态能量转移；在室温下，能量转移速率在大约6 nm范围内与距离无关，仅与温度弱相关。
Here, we recognize the growing significance of miniaturized devices as medical diagnostic tools and highlight the need to provide a convenient means of powering such instruments when implanted into the body. One of the most promising approaches to this end involves using a light-collection facility to absorb incident white light and transfer the photonic energy to a tiny semiconductor embedded on the device. Although fluorescent organic molecules offer strong potential as modules for such solar collectors, we emphasize the promise offered by transition metal complexes. Thus, an extended series of binuclear Ru(II)/Os(II) poly(pyridine) complexes has been shown to be highly promising sensitizers for amorphous silicon solar cells. These materials absorb a high fraction of visible light while the Ru(II)-based units possess triplet energies that are comparable to those of the naphthalene-based bridge. The metal complex injects a triplet exciton into the bridge and this, in turn, is trapped by the Os(II)-based terminal. The result is extremely efficacious triplet-energy transfer; at room temperature the rate of energy transfer is independent of distance over some 6 nm and only weakly dependent on temperature.