FAPbBr3@PbBr(OH) phosphor with high stability for anti-counterfeiting application via water induction.

Organic-inorganic hybrid perovskite quantum dots have become a very widely used semiconductor light-emitting material. However, perovskite quantum dots face stability challenges, which are the key factors hindering their application. In this paper, by introducing water into the synthesis of FAPbBr3 pervoskite, ultra-stable FAPbBr3@PbBr(OH) fluorescent material was prepared. The photoluminescence intensity of the material after the addition of water increased 2.9 times compared with that before the addition of water. The excellent green fluorescence emission was still maintained after four times wash-dry experiments. Meanwhile, it also exhibits good ultraviolet and thermal stability. The above enhanced performance of FAPbBr3 quantum dots is attributed the protection of PbBr(OH). In addition, the prepared material can be used as anti-counterfeit patterns. The anti-counterfeit patterns have good color rendering, and the luminous color has a high dependence on temperature. Both of these features make it very valuable for various fluorescent anti-counterfeiting labels.