Tong Yi, Zhao Xinyu, Tan Mei Chee, Zhao Rong
Engineering Product Development, Singapore University of Technology and Design, 8 Somapah Road, Singapore 487372.
Sci Rep. 2015 Nov 16;5:16761. doi: 10.1038/srep16761.
The advent of flexible optoelectronic devices has accelerated the development of semiconducting polymeric materials. We seek to replace conventional expensive semiconducting photodetector materials with our cost-effective composite system. We demonstrate in this work the successful fabrication of a photoconductive composite film of poly(3-hexylthiophene-2,5-diyl) (P3HT) mixed with NaYF4:Yb,Er nanophosphors that exhibited a ultrahigh photoresponse to infrared radiation. The high photocurrent measured was enabled by the unique upconversion properties of NaYF4:Yb,Er nanophosphors, where low photon energy infrared excitations are converted to high photon energy visible emissions that are later absorbed by P3HT. Here we report, a significant 1.10 × 10(5) times increment of photocurrent from our photoconductive composite film upon infrared light exposure, which indicates high optical-to-electrical conversion efficiency. Our reported work lays the groundwork for the future development of printable, portable flexible and functional photonic composites for light sensing and harvesting, photonic memory devices, and phototransistors.
柔性光电器件的出现加速了半导体聚合物材料的发展。我们试图用我们具有成本效益的复合系统取代传统的昂贵半导体光电探测器材料。在这项工作中，我们展示了成功制备的聚（3-己基噻吩-2,5-二亚基）（P3HT）与NaYF4:Yb,Er纳米磷光体混合的光电导复合薄膜，该薄膜对红外辐射表现出超高的光响应。所测量的高光电流是由NaYF4:Yb,Er纳米磷光体独特的上转换特性实现的，其中低光子能量的红外激发被转换为高光子能量的可见光发射，随后被P3HT吸收。在此我们报告，在红外光照射下，我们的光电导复合薄膜的光电流显著增加了1.10×10(5)倍，这表明具有高的光电转换效率。我们报道的工作为用于光传感和采集、光子存储器件及光晶体管的可印刷、便携式柔性和功能性光子复合材料的未来发展奠定了基础。
