Recent progress of photonic temperature‐sensing glass: From nano‐scale manipulation to macroscopic response

Abstract Photonic temperature glass sensors based on nanocrystal‐in‐glass composites (NGCs) offer a promising platform for advanced non‐contact temperature sensing. By precisely engineering the distribution of functional nanocrystals and modulating energy transfer mechanisms at the microscale, these sensors achieve exceptional performance, including high sensitivity, fast response time, robust anti‐interference capability, and excellent environmental adaptability. This review systematically analyzes how nano‐scale manipulation innovations enhance the performance of macroscopic temperature sensing. It elucidates key scientific challenges and recent advances, covering fundamental thermometric principles, material fabrication techniques, and innovative breakthroughs in NGC‐based photonic temperature sensors. Finally, we highlight remaining challenges and provide insights into future opportunities for advancement.