Method for synthesizing colloidal InSb quantum dots

Abstract

The present invention relates to a method for synthesizing colloidal InSb quantum dots (InSb QDs), comprising the step of premixing an In precursor and an Sb precursor at a temperature of less than 100°C while stirring.

Claims

1. A method for synthesizing colloidal InSb quantum dots (InSb QDs), comprising the following steps: (1) A step of premixing the In precursor and the Sb precursor, a) Sb(NR １ R ２ )) ３ (where R １ and R ２ are independently C １ -C ８ alkyl and / or C ６ -C １０ aryl), into a solution containing a saturated fatty amine having 4 to 20 carbon atoms, or an unsaturated fatty amine having 12 to 20 carbon atoms and 1 to 3 unsaturated double bonds b) Add In(I)X (where X is Cl, Br, or I) to a solution containing a saturated fatty amine having 12 to 20 carbon atoms, or an unsaturated fatty amine having 12 to 20 carbon atoms and 1 to 3 unsaturated double bonds, or a saturated fatty alkane having 12 to 30 carbon atoms, or an unsaturated fatty alkene having 12 to 30 carbon atoms and 1 to 6 unsaturated double bonds, or a mixture of several of these compounds. The process involves heating the resulting mixture to a temperature of less than 100°C while stirring, (2) A step of synthesizing InSb quantum dots (InSb QDs), a) A solvent or solvent mixture selected from the group consisting of saturated fatty amines having 12 to 20 carbon atoms, or unsaturated fatty amines having 12 to 20 carbon atoms and 1 to 3 unsaturated double bonds, and unsaturated fatty alkenes having 12 to 30 carbon atoms and 1 to 6 unsaturated double bonds is heated to a temperature of 150°C to 400°C. b) The solution obtained in (1), and C ４ ~C ２５ Alkylphosphine, C ４ ~C ２５ Alkylphosphine oxide, C ４ ~C ２５ Alkylphosphonic acid, and C ４ ~C ２５ A coordinating agent selected from the group consisting of alkylphosphinic acids is added to the solvent or solvent mixture. i) Introduce at a temperature of 150°C to 400°C, and hold the resulting mixture at a temperature of 150°C to 400°C for 1 minute to 5 hours while stirring, or ii) A process in which the mixture is introduced at a temperature of 20°C to 30°C, the temperature of the resulting mixture is raised to 150°C to 400°C and heated, and the resulting mixture is held at a temperature of 150°C to 400°C for 1 minute to 5 hours while stirring. Methods that include...

2. The method according to claim 1, wherein the unsaturated fatty amine having 12 to 20 carbon atoms and 1 to 3 unsaturated double bonds is selected from the group consisting of palmitrailamine, oleylamine, linolylamine, linolenylamine, and petroselinylamine.

3. The method according to claim 1 or 2, wherein the unsaturated fatty alkene having 12 to 20 carbon atoms and 1 to 6 unsaturated double bonds is selected from the group consisting of 1-octadecene, 1-eicosene, and squalene.

4. The method according to any one of claims 1 to 3, wherein the saturated fatty alkane having 12 to 30 carbon atoms is selected from the group consisting of octadecane and squalane.

5. The method according to any one of claims 1 to 4, wherein the saturated fatty amine having 12 to 20 carbon atoms may be selected from the group consisting of dodecylamine, tetradecylamine, hexadecylamine, and octadecylamine.

6. The method according to any one of claims 1 to 5, wherein the coordinating agent is selected from the group consisting of tri-n-octylphosphine (TOP), tri-n-butylphosphine (TBP), tri-n-octylphosphine oxide (TOPO), dodecylphosphonic acid (DDPA), tetradecylphosphonic acid (TDPA), hexadecylphosphonic acid (HDPA), and octadecylphosphonic acid (ODPA).

7. In process (1) InX:Sb(NR １ R ２ ) ３ The method according to any one of claims 1 to 6, wherein the molar ratio of is between 3:1 and 6:

1.

8. The method according to any one of claims 1 to 7, wherein the molar ratio of InX to the coordinating agent in step (2) is between 1:1 and 1:

3.

9. The method according to any one of claims 1 to 8, wherein the mixture in step (1)b) is heated to a temperature of 25°C to 100°C.

10. The method according to any one of claims 1 to 9, wherein the mixture in step (1)b) is heated for 30 minutes to 3 hours.

11. The solvent in step (2) a) is first heated to a temperature of 100°C to 130°C for 10 －１ mbar~10 －２ The method according to any one of claims 1 to 10, wherein the material is degassed under a vacuum of mbar for 30 minutes to 2 hours, and then heated to 150°C to 400°C.

12. The method according to any one of claims 1 to 11, comprising introducing the solution obtained in (1) and the coordinating agent in step (2)b) into the solvent or solvent mixture at a temperature of 150°C to 400°C, and holding the resulting mixture at a temperature of 150°C to 400°C for 1 minute to 5 hours.

13. Use of the method according to any one of claims 1 to 12 for manufacturing infrared biological imaging devices, NIR / SWIR photodetectors, (1.4 μm) detectors for telecommunications, solar cells, infrared light-emitting diodes (LEDs), field-effect transistors, or thermoelectric devices.

14. A method for manufacturing infrared biological imaging devices, NIR / SWIR photodetectors, detectors compatible with wavelengths used in telecommunications (1.4 μm) detectors / optical fibers (1.3 μm and 1.55 μm), solar cells, infrared light-emitting diodes (LEDs), field-effect transistors, or thermoelectric devices, a) A step of synthesizing colloidal InSb quantum dots (InSb QDs) according to the method of the present invention, b) A process for performing surface engineering on InSb QD, c) A process for fabricating an InSb QD thin film, d) A step of incorporating the QD thin film into the (optical) electronic device, Methods that include...

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