Quantum dot material and preparation method thereof, quantum dot display device, and display apparatus
View Patent ↗Embodiments of the present disclosure provide a quantum dot material including a quantum dot body and a primary ligand A″ and a secondary ligand B″ coated on a surface of the quantum dot body, and a carbon chain length of the primary ligand A″ is 1.3 to 4.5 times a carbon chain length of the secondary ligand B″.
1 . A quantum dot material comprising:
a quantum dot body and a primary ligand A″ and a secondary ligand B″ coated on a surface of the quantum dot body, and a carbon chain length of the primary ligand A″ being 1.3 to 4.5 times a carbon chain length of the secondary ligand B″; wherein
a molar ratio of the primary ligand A″ to the secondary ligand B″ ranges from 1:10 to 10:1 for reducing steric hindrance and improving ligand coverage rate on a surface of the quantum dot body;
the primary ligand A″ and the secondary ligand B″ have polar groups with a same polarity level and have a same number of the polar groups.
2 . The quantum dot material according to claim 1 , wherein the primary ligand A″ has a carbon chain length of 8 to 18 and the secondary ligand B″ has a carbon chain length of 4 to 6.
3 . The quantum dot material according to claim 1 , wherein the number of carbon atoms of the secondary ligand B″ does not exceed half of the number of carbon atoms of the primary ligand A″; or
the primary ligand A″ is an aromatic hydrocarbon ligand or an aliphatic hydrocarbon ligand, and the secondary ligand B″ is an aliphatic hydrocarbon ligand.
4 . The quantum dot material according to claim 1 , wherein
the primary ligand A″ is a linear aliphatic hydrocarbon ligand having the number of carbon atoms in the range from 8 to 18, or the primary ligand A″ is an aliphatic hydrocarbon ligand containing a branched chain, with the number of carbon atoms of the branched chain being in the range from 1 to 6 or from 8 to 18, wherein the secondary ligand B″ is a linear aliphatic hydrocarbon ligand having the number of carbon atoms in the range from 4 to 6, or the secondary ligand B″ is an aliphatic hydrocarbon ligand containing a branched chain, with the number of carbon atoms of the branched chain being in the range from 1 to 2 or from 4 to 6 and the number of branched chains being 1; or
neither the primary ligand A″ nor the secondary ligand B″ contains a large steric hindrance group, and the large steric hindrance group comprising a phenyl group, a triphenylamine group or a carbazole group.
5 . The quantum dot material according to claim 1 , wherein a polar group of the polar groups is selected from any one or more of an amide group, an ether group, a carbonyl group, and an ester group.
6 . The quantum dot material according to claim 1 , wherein
the ligand is a linear aliphatic hydrocarbon ligand having the following general formula:
n 1 =1 or 2, n 2 =4 to 12 in the primary ligand A″ and n 2 =0 or 1 in the secondary ligand B″; or
the ligand is an aliphatic hydrocarbon ligand containing a branched chain having the following general formula:
n 3 =4 to 12 in the primary ligand A″ and n 3 =0 or 1 in the secondary ligand B″;
R 1 is a thioether group, an alcoholamine group, an ether group, an amide group or an epoxy group;
R 2 is an amide group, an ether group, a carbonyl group or an ester group.
7 . The quantum dot material according to claim 1 , wherein the primary ligand A″ is
the secondary ligand B″ is
8 . A quantum dot material, the quantum dot material comprising:
a quantum dot body and a primary ligand A″ and a secondary ligand B″ coated on a surface of the quantum dot body, wherein
a molar ratio of the primary ligand A″ to the secondary ligand B″ ranges from 1:10 to 10:1 for reducing steric hindrance and improving ligand coverage rate on a surface of the quantum dot body;
the primary ligand A″ and the secondary ligand B″ have polar groups with a same polarity level and have a same number of the polar groups.
9 . The quantum dot material according to claim 8 , wherein the primary ligand A″ and the secondary ligand B″ have similar polarity; and/or
the polar group is selected from any one or more of an amide group, an ether group, a carbonyl group, and an ester group.
10 . A quantum dot display device comprising a quantum dot material according to claim 1 .
11 . The quantum dot display device according to claim 10 , comprising: an anode, a cathode, and a light emitting layer disposed between the anode and the cathode, wherein the material of the light emitting layer is the quantum dot material.
12 . A display apparatus comprising a plurality of quantum dot display devices according to claim 10 .