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Biomacromolecular networks, crucial components of biological systems, are of great importance in biological and nanomedical science, in which the interfaces between nanoparticle and macromolecular networks are intriguing and drawing great attention. Herein, this review seeks to present the state‐of‐art progress and perspective of the dynamic behaviors, confinement and entropy at the nanoparticle‐biomacromolecular network interfaces. The basic biomacromolecular networks in living systems, recent research on networks with dynamic bonds and various diffusion behaviors of nanoparticles within biomacromolecular networks are summarized. In particular, entropic effects in the confined environments of biological networks are discussed, along with how they impact the mechanical properties and dynamical behaviors. The interesting research and findings included in this review might offer the scientific community a better understanding of how this field has developed thus far, and are anticipated to trigger more systematic and fundamental research to elucidate the underlying physics and broaden the potential applications of macromolecular networks, biological and artificial. [ABSTRACT FROM AUTHOR]

All‐inorganic perovskite nanocrystals (NCs) have received extensive attention for next‐generation thin film devices due to their excellent optical properties, such as strong light absorption, high carrier mobility, and defect tolerance. However, significant challenges remain to obtain high‐quality perovskite thin films. Herein, a simple but effective post‐treatment by laser irradiation for CsPbBr3 NCs thin films is reported. Laser‐induced secondary crystallization is observed in CsPbBr3 NCs thin films after treatment. In addition, amplified spontaneous emission (ASE) with a low threshold (5.6 µJ cm−2) and a high gain value (743 cm–1) is achieved. Based on optical measurements, it is attributed to the low defect density, reduced Auger recombination, and weak exciton–phonon interactions, which greatly suppress the nonradiative recombination channels. The ASE from the film after treatment has a high characteristic temperature (134 K), showing a stable optical gain performance that maintains its intensity for 35 h at room temperature (and 12 h at 40 °C). Finally, the proof‐of‐concept demonstration of graphic coding is shown. This study deepens the understanding of the optical gain mechanism of CsPbBr3 perovskite films and provides a simple and convenient laser treatment that enables the fabrication of high‐quality CsPbBr3 perovskite thin films. [ABSTRACT FROM AUTHOR]