Ultra‐Stable and Highly Luminescent Perovskite for Multi‐Color Ultraviolet Single‐Pixel Imaging

Ultraviolet (UV) detection and spectral imaging technology play a crucial role in information acquisition. However, this wavelength is beyond the silicon detectors' response range. Currently, all-inorganic lead halide perovskite nanocrystals exhibit excellent photoluminescent properties converting UV photons to visible photons, which provide a solution for UV detection. Nevertheless, their practical application is restricted by poor stability when exposed to water, UV light, or heat. Therefore, it is essential to develop a viable preparation method for producing high-performance thin film devices. In this study, a design is proposed involving CsPbX₃ composites, doped with Mg²⁺ and coated with Styrene-Ethylene-Butylene-Styrene (SEBS). Notably, the Mg-CsPbX₃@SEBS demonstrate exceptional environmental stability, linearity in UV resistance, and water stability, exhibiting a mere 18% decrease in luminous intensity after 168 h of immersion, Additionally, these composites demonstrate high-temperature stability, enduring temperatures up to 500 K. Using compressed sensing technology and composite films, multi-color imaging is also achieved under various UV light conditions with a resolution of 128 × 128 pixels. This work provides valuable insights into the down-conversion properties of perovskite materials, broadening their potential applications.