Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
Adv Mater. 2017 Aug;29(32). doi: 10.1002/adma.201701772. Epub 2017 Jun 22.
Human eyes use retina photoreceptor cells to absorb and distinguish photons from different wavelengths to construct an image. Mimicry of such a process and extension of its spectral response into the near-infrared (NIR) is indispensable for night surveillance, retinal prosthetics, and medical imaging applications. Currently, NIR organic photosensors demand optical filters to reduce visible interference, thus making filter-free and anti-visible NIR imaging a challenging task. To solve this limitation, a filter-free and conformal, retina-inspired NIR organic photosensor is presented. Featuring an integration of photosensing and floating-gate memory modules, the device possesses an acute color distinguishing capability. In general, the retina-like photosensor transduces NIR (850 nm) into nonvolatile memory and acts as a dynamic photoswitch under green light (550 nm). In doing this, a filter-free but color-distinguishing photosensor is demonstrated that selectively converts NIR optical signals into nonvolatile memory.
人眼利用视网膜光感受器细胞吸收和区分来自不同波长的光子，从而构建图像。模仿这一过程，并将其光谱响应扩展到近红外 (NIR) 对于夜视、视网膜假体和医学成像应用是必不可少的。目前，NIR 有机光电传感器需要光学滤波器来减少可见光的干扰，因此实现无滤波器和抗可见近红外成像是一项具有挑战性的任务。为了解决这个限制，提出了一种无滤波器和共形的、受视网膜启发的 NIR 有机光电传感器。该器件集成了光电传感和浮动栅存储模块，具有敏锐的颜色区分能力。总的来说，这种类似视网膜的光电传感器可以将 NIR（850nm）转换为非易失性存储器，并在绿光（550nm）下作为动态光开关。通过这种方式，展示了一种无需滤波器但具有颜色区分能力的光电传感器，它可以选择性地将近红外光信号转换为非易失性存储器。
