Quantum dot film, method for patterning the quantum dot film and applications thereof

1 . A quantum dot film, comprising a target color quantum dot film and a residual non-target color quantum dot film, wherein

a ligand for a target color quantum dot of the target color quantum dot film is an oil-soluble ligand;

a ligand for a residual non-target color quantum dot of the residual non-target color quantum dot film is selected from any one or more of halogen ions and short-chain organic ligands whose carbon chain length is in a range of 2 to 18 carbons;

the residual non-target color quantum dot is different in color from the target color quantum dot;

the residual non-target color quantum dot film does not emit light.

2 . The quantum dot film of claim 1 , wherein the halogen ion is selected from any one or more of I—, Br—, and Cl—.

3 . The quantum dot film of claim 1 , wherein a short-chain organic ligand of the short-chain organic ligands is selected from any one or more of carboxylic acid, sulfonic acid, mercaptan, phosphonic acid and amine.

4 . The quantum dot film of claim 3 , wherein the short-chain organic ligand has a carbon chain length in a range of 2 to 8 carbons.

5 . The quantum dot film of claim 4 , wherein the carboxylic acid is selected from any one or more of acetic acid, propionic acid, mercaptopropionic acid, butyric acid and 1, 4-succinic acid;

the sulfonic acid is selected from any one or more of mesanesulfonic acid, ethanesulfonic acid, propanesulfonic acid and butyl sulfonic acid;

the mercaptan is selected from any one or more of 1, 2-ethylenedimercaptan, ethylmercaptan, 1-propylmercaptan, 1-butyl mercaptan, 1-octyl mercaptan 1-dodecyl mercaptan, 1-octadecyl mercaptan and 1, 2-benzenedimethyl mercaptan; and

the amine is selected from any one or more of ethylenediamine, ethylamine, propylamine and butylamine.

6 . The quantum dot film of claim 1 , wherein

the quantum dot film further comprises a functional quantum dot film disposed on a side of the target color quantum dot film,

a quantum dot of the functional quantum dot film is a target color quantum dot, and a ligand for the quantum dot of the functional quantum dot film is selected from any one or more of halogen ions and short-chain organic ligands whose carbon chain length is in a range of 2 to 18 carbons.

7 . A quantum dot photoelectric device, comprising the quantum dot film of claim 1 .

8 . The quantum dot photoelectric device of claim 7 , wherein

the quantum dot photoelectric device is a quantum dot light-emitting diode that comprises an anode, a cathode, and a quantum dot light-emitting layer disposed between the anode and the cathode, and the quantum dot light-emitting layer comprises the quantum dot film.

9 . The quantum dot photoelectric device of claim 7 , wherein

the quantum dot photoelectric device is a quantum dots-blue light organic light-emitting diode, wherein the quantum dots-blue light organic light-emitting diode comprises a blue light organic light-emitting diode and a quantum dot conversion layer disposed at a side of the blue light organic light-emitting diode, and the quantum dot conversion layer is the quantum dot film;

the blue light organic light-emitting diode comprises an anode, a cathode and a blue light-emitting layer between the anode and the cathode; and

the quantum dot conversion layer comprises a red quantum dot conversion layer and a green quantum dot conversion layer, wherein the red quantum dot conversion layer comprises a red quantum dot film and a residual green quantum dot film, and the green quantum dot conversion layer comprises a green quantum dot film and a residual red quantum dot film.

10 . A display apparatus, comprising the quantum dot photoelectric device of claim 7 .

11 . The display apparatus of claim 10 , wherein the quantum dot photoelectric device comprises quantum dot light-emitting diodes emitting red light, green light and blue light, respectively, and each of the quantum dot light-emitting diodes comprises an anode, a cathode, a quantum dot light-emitting layer between the anode and the cathode, and the quantum dot light-emitting layer is the quantum dot film; wherein,

a quantum dot light-emitting layer of the quantum dot light-emitting diode emitting red light comprises a target red quantum dot film, a residual green quantum dot film and a residual blue quantum dot film in a direction away from a substrate sequentially; a ligand for a target red quantum dot of the target red quantum dot film is the oil-soluble ligand, a ligand for a residual green quantum dot of the residual green quantum dot film of the quantum dot light-emitting diode emitting red light is a first ligand, and a ligand for a residual blue quantum dot of the residual blue quantum dot film of the quantum dot light-emitting diode emitting red light is a second ligand;

a quantum dot light-emitting layer of the quantum dot light-emitting diode emitting green light comprises a residual red quantum dot film, a target green quantum dot film and a residual blue quantum dot film in the direction away from the substrate sequentially; a ligand for a target green quantum dot of the target green quantum dot film is the oil-soluble ligand, a ligand for a residual red quantum dot of the residual red quantum dot film of the quantum dot light-emitting diode emitting green light is a third ligand, and a ligand for a residual blue quantum dot of the residual blue quantum dot film of the quantum dot light-emitting diode emitting green light is the second ligand;

a quantum dot light-emitting layer of the quantum dot light-emitting diode emitting blue light comprises a residual red quantum dot film, a residual green quantum dot film and a target blue quantum dot film in the direction away from the substrate sequentially; a ligand for a target blue quantum dot of the target blue quantum dot film is the oil-soluble ligand, a ligand for the-a residual red quantum dot of the residual red quantum dot film of the quantum dot light-emitting diode emitting blue light is the third ligand, and a ligand for a residual green quantum dot of the residual green quantum dot film of the quantum dot light-emitting diode emitting blue light is the first ligand;

wherein each of the first ligand, the second ligand, and the third ligand is independently selected from any one or more of halogen ions and short-chain organic ligands whose carbon chain length is in a range of 2 to 18 carbons.

12 . The display apparatus of claim 11 , wherein

the first ligand is selected from any one or more of I—, Br— and Cl—, or from any one or more of carboxylic acid, sulfonic acid, mercaptan, phosphonic acid and amine;

the second ligand is selected from any one or more of I—, Br— and Cl—, or from any one or more of carboxylic acid, sulfonic acid, mercaptan, phosphonic acid and amine; and

the third ligand is selected from any one or more of I—, Br— and Cl—, or from any one or more of carboxylic acid, sulfonic acid, mercaptan, phosphonic acid and amine.

13 . The display apparatus of claim 12 , wherein the third ligand for the residual red quantum dot comprises a first halogen ion, a second halogen ion and a third halogen ion, wherein the first halogen ion has a particle size greater than that of the second halogen ion, and the second halogen ion has a particle size greater than that of the third halogen ion.

14 . The display apparatus of claim 13 , wherein the first halogen ion is I—, the second halogen ion is Br—, and the third halogen ion is Cl—.

15 . A method for patterning a quantum dot film, comprising steps S 100 and S 200 , wherein:

in S 100 , quantum dots with oil-soluble ligands are used to form a quantum dot film in a whole pixel region, the quantum dot film in a non-retaining pixel region is removed to obtain a patterned quantum dot film; wherein the patterned quantum dot film comprises a target color quantum dot film and a residual non-target color quantum dot film;

in S 200 , precursors for exchange ligands are used to perform a ligand exchange reaction with residual quantum dots in the non-retaining pixel region, so that the oil-soluble ligands on surfaces of the residual quantum dots in the non-retaining pixel region are exchanged for the exchange ligands, and a residual quantum dot film in the non-retaining pixel region is obtained;

wherein an exchange ligand of the exchange ligands is selected from any one or more of halogen ions and short-chain organic ligands whose carbon chain length is in a range of 2 to 18carbons;

a residual non-target color quantum dot of the residual non-target color quantum dot film is different in color from a target color quantum dot of the target color quantum dot film;

the residual non-target color quantum dot film does not emit light.

16 . The method for patterning the quantum dot film of claim 15 , comprising steps S 101 S 102 , S 103 , S 201 , S 202 and S 203 :

in S 101 , red quantum dots with the oil-soluble ligands are used to form a red quantum dot film in the whole pixel region, the red quantum dot film in a green pixel region and a blue pixel region is removed to obtain a patterned red quantum dot film;

in S 201 , precursors for third exchange ligands are used to perform a ligand exchange reaction with residual red quantum dots in the green pixel region and the blue pixel region, so that the oil-soluble ligands on surfaces of the residual red quantum dots in the green pixel region and the blue pixel region are exchanged for the third exchange ligands, and a residual red quantum dot film in the green pixel region and the blue pixel region is obtained;

in S 102 , green quantum dots with the oil-soluble ligands are used to form a green quantum dot film in the whole pixel region, the green quantum dot film in a red pixel region and the blue pixel region is removed to obtain a patterned green quantum dot film;

in S 202 , precursors for first exchange ligands are used to perform a ligand exchange reaction with residual green quantum dots in the red pixel region and the blue pixel region, so that the oil-soluble ligands on surfaces of the residual green quantum dots in the red pixel region and the blue pixel region are exchanged for the first exchange ligands, and a residual green quantum dot film in the red pixel region and the blue pixel region is obtained;

in S 103 , blue quantum dots with the oil-soluble ligands are used to form a blue quantum dot film in the whole pixel region, the blue quantum dot film in the red pixel region and the green pixel region is removed to obtain a patterned blue quantum dot film;

in S 203 , precursors for second exchange ligands are used to perform a ligand exchange reaction with residual blue quantum dots in the red pixel region and the green pixel region, so that the oil-soluble ligands on surfaces of the residual blue quantum dots in the red pixel region and the green pixel region are exchanged for the second exchange ligands, and a residual blue quantum dot film in the red pixel region and the green pixel region is obtained.

17 . The method for patterning the quantum dot film of claim 15 , wherein S 200 comprises using precursors for a variety of exchange ligands to sequentially perform a ligand exchange reaction with the residual quantum dots in the non-retaining pixel region, so that the oil-soluble ligands on the surfaces of the residual quantum dots in the non-retaining pixel region are exchanged for the variety of exchange ligands, and the residual quantum dot film in the non-retaining pixel region is obtained.

18 . The method for patterning the quantum dot film of claim 17 , wherein S 200 comprises:

using an organic salt of a first halogen to perform a ligand exchange reaction with the residual quantum dots in the non-retaining pixel region, so that a first residual quantum dot film with a surface ligand comprising a first halogen ion is obtained in the non-retaining pixel region;

using an organic salt of a second halogen in follow to perform a ligand exchange reaction with the residual quantum dots in the non-retaining pixel region, so that a second residual quantum dot film with a surface ligand comprising the first halogen ion and a second halogen ion is obtained in the non-retaining pixel region; and

using an organic salt of a third halogen in follow to perform a ligand exchange reaction with the residual quantum dots in the non-retaining pixel region, so that a third residual quantum dot film with a surface ligand comprising the first halogen ion, the second halogen ion and a third halogen ion is obtained in the non-retaining pixel region;

wherein a particle size of the first halogen ion is larger than a particle size of the second halogen ion, and the particle size of the second halogen ion is larger than a particle size of the third halogen ion.

19 . The method for patterning the quantum dot film of claim 18 , wherein the first halogen ion is I—, the second halogen ion is Br—, and the third halogen ion is Cl—.

20 . The method for patterning the quantum dot film of claim 15 , wherein the ligand exchange reaction in S 200 comprises:

dissolving the precursors for the exchange ligands in a solvent to manufacture a solution containing the precursors for the exchange ligands;

dropping the solution containing the precursors for the exchange ligands on the residual quantum dot film in the non-retaining pixel region, standing the residual quantum dot film in the non-retaining pixel region for a first time period, and then spinning dry; or, soaking the residual quantum dot film in the non-retaining pixel region in the solution containing the precursors for the exchange ligands, taking the residual quantum dot film in the non-retaining pixel region out after standing the residual quantum dot film in the non-retaining pixel region for a second time period, and spinning dry; and

cleaning a surface of a spun-dried quantum film in the non-retaining pixel region with a solvent same as that of the solution containing the precursors for the exchange ligands.