Hybrid Manganese(II) Bromide Arrays for Broadband Light Detection from Ultraviolet to Blue

Abstract Efficient detection of high‐energy photons in the ultraviolet (UV) and blue wavebands is critical for applications such as environmental monitoring and biomedical diagnostics. As photoelectric conversion materials, conventional wide‐bandgap inorganic semiconductors or conjugated organic semiconductors face trade‐offs among costly fabrication, restricted flexibility, limited performance, and poor stability. Here, pixelated hybrid manganese(II) bromide crystalline‐glass (CG) arrays are introduced as the light converters that give rise to indirect‐type UV–blue detection once integrated with mature thin‐film transistor sensors. The CG is composed of crystalline (TPP) 2 MnBr 4 and glassy (BTPP) 2 MnBr 4 (termed as TPP/BTPP CG), in which the former ensures a high photoluminescence quantum yield (PLQY) and the latter contributes to a low melting temperature. As a result, the TPP/BTPP CG combines the merits of high emission efficiency (>50% PLQY across 200–500 nm) and low processing temperature (as low as 195 °C). Patterned into pixelated arrays, the TPP/BTPP CG as the light converter provides strong optical confinement, minimal crosstalk, efficient light extraction, and wide‐angle responsivity, enabling real‐time UV–blue light monitoring. Overall, the work introduces a method for the design of eutectic metal halide hybrids with pixelated architectures for high‐performance UV–blue photodetection and imaging.