Simple synthesis of dual-emission CsPbBr3@EuBTC composite for latent fingerprints and optical anti-counterfeiting applications

As an emerging optical material, all-inorganic perovskite quantum dots (QDs) have been successfully applied in some fields. However, inherent ionic properties of perovskite QDs lead to poor stability of water and heat which severely hinders the further industrial applications. Therefore, the incorporation of Metal-Organic Framework (MOF) into QDs to obtain CsPbX3@MOF composite is developing to improve the stability of all-inorganic perovskite QDs. In this work, a simple and fast method was developed to synthesize a CsPbBr3@EuBTC com-posite. The water stability and thermal stability of the CsPbBr3@EuBTC composite have been improved compared to pure CsPbBr3 QDs. Simultaneously, luminescent properties and promising latent fingerprints and optical anti-counterfeiting applications of the CsPbBr3@EuBTC composite are further explored. Under fluores-cent interference, it still shows excellent luminescence sensitivity and anti-interference ability. The CsPbBr3@EuBTC composite displays dual-mode luminescence as excited under the 365 nm or 254 nm ultraviolet (UV) excitation wavelength. Adjusting the ratio of CsPbBr3 QDs to EuBTC in the CsPbBr3@EuBTC composite can also achieve multi-color luminescence. Therefore, it is expected that CsPbBr3@EuBTC can be applied to latent fingerprints and multi-mode optical anti-counterfeiting materials.