In recent years, all-inorganic perovskite has been extensively studied due to its excellent photoelectric properties, but the application of Cs n PbBr 2+ n perovskite with excellent stability in the field of chemical sensing has yet to be developed. Herein, Cs 4 PbBr 6 /CsPbBr 3 with good stability was successfully prepared by controlling the synthesis temperature to 100 ° C. The fluorescence intensity of Cs 4 PbBr 6 /CsPbBr 3 exhibited 2,4-dinitriphenylhydrazine (DNPH) concentration-dependent characteristics and could be used for sensing DNPH based on the dynamic quenching process triggered by the collision between Cs 4 PbBr 6 /CsPbBr 3 and DNPH. A good linear model was established based on the detection signal and DNPH concentration in the range of 0.05∼30 mg/L and the detection limit was 0.033 mg/L. This method was applied to detect DNPH in soil and tap water samples with satisfactory results obtained. Therefore, this research broadens the application of Cs n PbBr 2+ n in the field of quantitative detection and is expected to be developed into a fluorescent sensor for the detection of hydrazine substances.
Perovskite has shown attractive optoelectronic performances and is a potential material in lighting, anti-counterfeiting, sensor, and other optoelectronic devices. Recently, spin-coating has been widely used in fabricating high-performance perovskite films, but it is difficult to process and apply in practice. In this paper, the CsPbBr 3 /Cs 4 PbBr 6 composite perovskite quantum dots with photoluminescence quantum yield of 36% and high storage stability were prepared by using room temperature ligand-assisted precipitation method and controlling the proportion of CsBr/PbBr 2 . In addition, the composite perovskite was ground and dispersed in the inks system. After adjusting the composition and ratio of the resin components, the inks were suitable for screen printing with a viscosity of 2439 mPa•s, an initial dryness of 25 mm/30 s, and a thorough dryness of 100 s/100 μm. By printing, the perovskite films exhibited high coverage, strong green emission, and outstanding fluorescence recovery ability after exposure to water. Screen printing perovskite inks have the characteristic of being patternable, which provides a solution for preparing a perovskite film in the application.
危险品化学品经营许可证（带存储）