Quantum dot cluster, quantum dot light-emitting device and preparation method of quantum dot cluster

The invention provides a quantum dot cluster, a quantum dot light-emitting device and a preparation method of the quantum dot cluster. The quantum dot cluster comprises at least two quantum dots, the surfaces of the quantum dots are combined with organic ligands and inorganic ligands, the organic ligands and the inorganic ligands are negatively charged coordination ligands or neutral electron donor ligands, and the at least two quantum dots are fused. According to the preparation method of the quantum dot cluster, long-chain organic ligands of the same type are replaced or stripped by short-chain inorganic ligands through ligand exchange reaction, and as the density of the organic ligands on the surfaces of the quantum dots is reduced, the quantum dots without the ligands are bonded into an aggregation state under the action of aggregation force, namely, the quantum dot cluster is obtained. The distance between the quantum dots is shortened, the interface potential barrier is reduced, shells of the quantum do