We report a miniaturized device integrating a photoactive material with a highly efficient
Light Emitting Diode light source. This so-called micro light plate configuration allows for
maximizing the irradiance impinging on the photoactive material, with a minimum power
consumption, excellent uniformity, and accurate control of the illumination. We demonstrate
these advantages with an example application: photoactivated gas sensors with a power
consumption as low as 30 μW (this is 1000 times lower than the best figures reported to …