Perovskite quantum dot composite material and preparation method and application thereof

The invention provides a perovskite quantum dot composite material and a preparation method and application thereof. The perovskite quantum dot composite material comprises perovskite quantum dots and an alkaline earth metal doped molecular sieve coating the surfaces of the quantum dots. The perovskite quantum dots are coated by the alkaline earth metal doped molecular sieve, so that the perovskite quantum dots can be packaged through the molecular sieve and protected from water and oxygen erosion, the perovskite quantum dots can be passivated by the alkaline earth metal on the inner wall skeleton of the molecular sieve pore channel, the defect density of the perovskite quantum dots is reduced, and the performance of the perovskite quantum dots is improved. The alkaline earth metal replaces a part of a silicon skeleton, so that the effect of fixing the position of the perovskite quantum dot can be achieved, the damage of lattice distortion generated by lattice vibration when the perovskite quantum dot is subj