3 research outputs found
Near-IR Photoinduced Electrochemiluminescence Imaging with Structured Silicon Photoanodes
Infrared (IR) imaging devices that convert IR irradiation
(invisible
to the human eye) to a visible signal are based on solid-state components.
Here, we introduce an alternative concept based on light-addressable
electrochemistry (i.e., electrochemistry spatially confined under
the action of a light stimulus) that involves the use of a liquid
electrolyte. In this method, the projection of a near-IR image (位exc = 850 or 840 nm) onto a photoactive Si-based photoanode,
immersed into a liquid phase, triggers locally the photoinduced electrochemiluminescence
(PECL) of the efficient [Ru(bpy)3]2+-TPrA system.
This leads to the local conversion of near-IR light to visible (位PECL = 632 nm) light. We demonstrate that compared to planar
Si photoanodes, the use of a micropillar Si array leads to a large
enhancement of local light generation and considerably improves the
resolution of the PECL image by preventing photogenerated minority
carriers from diffusing laterally. These results are important for
the design of original light conversion devices and can lead to important
applications in photothermal imaging and analytical chemistry
Near-IR Photoinduced Electrochemiluminescence Imaging with Structured Silicon Photoanodes
Infrared (IR) imaging devices that convert IR irradiation
(invisible
to the human eye) to a visible signal are based on solid-state components.
Here, we introduce an alternative concept based on light-addressable
electrochemistry (i.e., electrochemistry spatially confined under
the action of a light stimulus) that involves the use of a liquid
electrolyte. In this method, the projection of a near-IR image (位exc = 850 or 840 nm) onto a photoactive Si-based photoanode,
immersed into a liquid phase, triggers locally the photoinduced electrochemiluminescence
(PECL) of the efficient [Ru(bpy)3]2+-TPrA system.
This leads to the local conversion of near-IR light to visible (位PECL = 632 nm) light. We demonstrate that compared to planar
Si photoanodes, the use of a micropillar Si array leads to a large
enhancement of local light generation and considerably improves the
resolution of the PECL image by preventing photogenerated minority
carriers from diffusing laterally. These results are important for
the design of original light conversion devices and can lead to important
applications in photothermal imaging and analytical chemistry