Inorganic perovskite quantum dots (QDs) and nanocrystals (NCs) have attracted much attention in recent years because of their high photoluminescence (PL) quantum yield (QY), narrow full width at half-maximum, and wide tunability across the whole visible range. In this work, space- and size-controlled precipitation of CsPbBr3 perovskite NCs was realized through a femtosecond laser-direct-writing method. Precipitation of CsPbBr3 NCs in glasses was confirmed by energy-dispersive spectroscopy, transmission electron microscopy analysis, and PL. Growth of CsPbBr3 perovskite NCs in glasses was modulated by femtosecond laser irradiation parameters such as the repetition rate, pulse energy, and scanning rate, and PL in the range spanning from blue to green was achieved. With the well-designed arrangement of CsPbBr3 NCs and the reduction of self-absorption emission, a solar concentrator fabricated by femtosecond laser irradiation can realize spectral conversion and enhance the quantum efficiency of solar cells.

Organic electronic-based gas sensors hold great potential for portable healthcare-and environment-monitoring applications. It has recently been shown that introducing a porous structure into an organic semiconductor (OSC) film is an efficient way to improve the gas-sensing performance because it facilitates the interaction between the gaseous analyte and the active layer. Although several methods have been used to generate porous structures, the development of a robust approach that can facilely engineer the porous OSC film with a uniform pore pattern remains a challenge. Here, we demonstrate a robust approach to fabricate porous OSC films by using a femtosecond laser-processed porous dielectric layer template. With this laser-assisted strategy, various polymeric OSC layers with controllable pore size and well-defined pore patterns were achieved. The consequent porous p-type polymer-based device exhibits enhanced sensitivity to the ammonia analyte in the range from 100 ppb to 10 ppm with remarkable reproducibility and selectivity. The micropattern of the active layer was precisely controlled by generating various pore densities in the predecorated templates, which results in modulated ammonia sensitivities ranging from 30 to 65% ppm −1 . Furthermore, we show that this approach can be used to fabricate flexible gas sensors with enhanced sensing performance and mechanical durability, which indicate that this femtosecond laser-assisted approach is very promising for the fabrication of next-generation wearable electronics.

Nontoxic cadmium-free ZnS and ZnSe QDs QDs with high quantum efficiency have drawn considerable attention for information display. Applications of ZnS and ZnSe QDs are limited by their short emission...

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