Quantum dot thin film, preparation method of quantum dot thin film and battery device

[0021] Correspondingly, a kind of preparation method of quantum dot thin film comprises the following steps:

[0022] S01: providing a first quantum dot solution, the first quantum dot solution contains quantum dots with initial ligands bound to their surfaces;

[0023] S02: providing a cationic precursor, adding the cationic precursor to the first quantum dot solution, and performing passivation treatment to obtain a second quantum dot solution;

[0024] S03: providing a thiol ligand, adding the thiol ligand to the second quantum dot solution, performing surface ligand exchange, and obtaining a third quantum dot solution;

[0025] S04: Depositing the third quantum dot solution on a substrate to obtain the quantum dot film.

[0026] The preparation method of the quantum dot film provided by the embodiment of the present invention firstly adds an appropriate amount of cation precursors to the quantum dot mixture to passivate the quantum dots, so that the surface of the quantum...

[0039] Preparation of PbS quantum dots

[0040] 1) Lead oleate {Pb(OA) 2} Preparation of precursors:

[0041] Take 0.6mmol of lead acetate trihydrate, 2ml of oleic acid (OA), and 10mL of octadecene (ODE) into a three-necked flask, first ventilate at room temperature for 20min, then raise the temperature to 150°C and stir for 30min, then lower the temperature to 120°C.

[0042] 2) Preparation of sulfur (S) precursor:

[0043] Add 4mmol of S to 6ml of trioctylphosphine (TOP), heat to 170°C for 30min, then cool down to 140°C.

[0044] 3) After raising the temperature of the mixed solution in 1) to 150°C, take 2mL of sulfur (S) precursor and quickly inject it into the flask to react for 10 minutes, quickly take out the heating mantle and wait for the temperature of the mixed solution to cool down to room temperature, then extract by adding The oil-soluble PbS near-infrared quantum dots are obtained by centrifugal separation and cleaning of the solvent and the precipitant, and t...

[0046] Pb(OA) 2 The passivated PbS quantum dots were prepared as follows:

[0047] 1) Take the PbS quantum dot solution (quantum dot weight is 100mg) in the above-mentioned embodiment 1 and disperse it in 10mL of 18 dilute solution. Under an inert gas, first carry out normal temperature exhaust for 20min, then raise the temperature of the quantum dot solution to 150 ℃.

[0048] 2) Take 0.5mmol of PbO, 1mmol of oleic acid (OA), and 5mL of octadecene into a 25mL three-necked flask to dissolve at 170°C under inert gas and then cool to room temperature for later use.

[0049] 3) Pb(OA) in 2) 2 The solution was added to the quantum dot solution in 1) for passivation for 30 minutes, and then the temperature of the mixed solution was lowered to 100° C. to maintain a constant temperature.