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Cu-based perovskite nanocrystals (NCs) have received great interest as alternatives to lead-based perovskite NCs due to their unique advantages of resource abundance and being environmentally friendly. However, the issue of their inherent low luminous efficiency has limited the application of fluorescence sensing fields. In this work, a highly sensitive fluorescence sensor based on Cu-based perovskite NCs has been constructed by embedding Cs 3 Cu 2 I 5 NCs in room temperature curable deep eutectic solvents (Cs 3 Cu 2 I 5 -DES) for the detection of NH 3 gas in the atmosphere. In this strategy, Lauric acid-based DES with room temperature curable property were successfully synthesized and used as the supporting materials of Cs 3 Cu 2 I 5 -DES sensing film. When NH 3 gas exists, NH 3 can be adsorbed and enriched on the surface of Cs 3 Cu 2 I 5 -DES film, and react with the carboxyl group on the DES, which leads to a significant decrease in the fluorescence intensity of Cs 3 Cu 2 I 5 -DES film. Under optimized experimental conditions, the as-prepared sensing film demonstrated a good linear relationship between the decreased intensity of the fluorescence and the NH 3 concentration, and a low limit-of-detection (LOD) of 0.0642 ppm for NH 3. Furthermore, the sensor also exhibited excellent selectivity and good stability. • A strategy for highly sensitive NH 3 detection using DES-prepared Cs 3 Cu 2 I 5 -based film as sensing materials. • DESs were functioned as solvents prepare Cs 3 Cu 2 I 5 and DESs after temperature curing were prepared into film. • The stability of Cs 3 Cu 2 I 5 film is enhanced significantly due to the hydrophobicity of Cs 3 Cu 2 I 5 -DES surface. • The excellent selectivity and sensitivity of Cs 3 Cu 2 I 5 film benefited from the proton-exchange reaction between NH 3 and LA and CA on the surface of Cs 3 Cu 2 I 5 film. [ABSTRACT FROM AUTHOR]