# US 11,999,762 B2 · Phosphine precursor for preparing quantum dot and quantum dot prepared therefrom

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- Number: US 11,999,762 B2
- Document ID: US11999762B2
- Status: Granted
- Kind: B2
- Application number: 17/715,470
- Filed: 2022-04-07
- Published: 2022-07-28
- Granted: 2024-06-04
- Earliest claimed: 2017-05-18
- Assignees: SK Chemicals Co., Ltd.
- Applicants: SK Chemicals Co., Ltd.
- Inventors: Jeong Ho Park; Hee Il Chae; Kyung Sil Yoon; Ju-Sik Kang; Yu Mi Chang; Nam-Choul Yang; Jae Kyun Park; Song Lee
- Web page: https://patentgrep.com/patent/US11999762B2

## CPC

- C07F 9/06: without P—C bonds
- C09K 11/565: {with zinc cadmium}
- C07F 19/00: Metal compounds according to more than one of main groups C07F1/00 - C07F17/00
- C09K 11/70: containing phosphorus
- Y02E 10/549: Organic PV cells
- Y02E 60/10: Energy storage using batteries
- C07F: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM (metal-containing porphyrins C07D487/22)
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

The present invention relates to a phosphine precursor for the preparation of a quantum dot, and a quantum dot prepared therefrom. Using the phosphine precursor for the preparation of a quantum dot of the present invention, a quantum dot with improved luminous efficiency and higher luminous color purity can be provided.

## Claims

### Claim 1

A method for preparing a phosphine precursor represented by the following Chemical Formula 1, comprising the steps of:
preparing a mixture of (i) a primary phosphine compound having the formula Q1PH2 or a secondary phosphine compound having the formula Q1Q2PH, (ii) an ether solvent, and (iii) alkyl lithium; and
adding a silyl halide compound to the mixture:
in the Chemical Formula 1,
Q1 is
Q2 iS
Q3 is
wherein R1 to R9 are identical to or different from each other, and each independently, C1-20 linear or branched alkyl, C6-30 aryl, C7-30 alkylaryl, or C7-30 arylalkyl, and
wherein at least one pair selected from the group consisting of (i) Q1 and Q2, (ii) Q1 and Q3, and (iii) Q2 and Q3 are different from each other.

### Claim 2 (depends on 1)

The method for preparing a phosphine precursor according to claim 1, wherein the ether solvent is tetrahydrofuran and the alkyl lithium is butyl lithium.

### Claim 3 (depends on 1)

The method for preparing a phosphine precursor according to claim 1, wherein R1 to R9 are each independently C1-6 linear alkyl, C3-6 branched alkyl, or C6-12 aryl.

### Claim 4 (depends on 1)

The method for preparing a phosphine precursor according to claim 1, wherein R1 to R9 are each independently methyl, ethyl, n-propyl, iso-propyl, n-butyl, tert-butyl, iso-butyl, or phenyl.

### Claim 5 (depends on 1)

The method for preparing a phosphine precursor according to claim 1, wherein the compound of the Chemical Formula 1 is selected from the group consisting of the following Structural Formulas:

### Claim 6 (depends on 1)

The method for preparing a phosphine precursor according to claim 1, wherein the compound of the Chemical Formula 1 is selected from the group consisting of the following Structural Formulas: