Confinement reaction synthesis of CsPbBr3 quantum dots within long afterglow mesoporous materials as lighting equipment

Long afterglow materials are fluorescent materials with unique optical properties and excellent light-converting materials. However, long afterglow materials have the problem of emitting relatively single colors that are difficult to change, thus limiting their further application. Here, we propose a composite method of fully inorganic cesium lead perovskite quantum dots (QDs) with long afterglow materials, which uses the confinement reaction of CsPbBr 3 in the pores of mesoporous CaAl 2 O 4 :Eu 2+ , Nd 3+ (M-CAO) during high-temperature melting to form M-CAO-CsPbBr 3 . M-CAO-CsPbBr 3 has better thermal and photostability than the common composite materials. Meanwhile, CsPbBr 3 QDs can generate green afterglow emissions by absorbing the afterglow energy of M-CAO. In addition, the polydimethylsiloxane (PDMS) film formed by mixing the composite material phosphor M-CAO-CsPbBr 3 with PDMS by heating and curing showed bright green fluorescence under 365   nm UV illumination, and it could still exhibit a weak green afterglow under dark conditions after stopping the irradiation. This article is an essential reference for long afterglow materials and anti-counterfeit labels.