# US 2018/0022994 A1 · Method for manufacturing carbonaceous luminescent material

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- Number: US 2018/0022994 A1
- Document ID: US20180022994A1
- Status: Published application
- Kind: A1
- Application number: 15/549,844
- Filed: 2016-02-02
- Published: 2018-01-25
- Earliest claimed: 2015-02-10
- Assignees: Nissan Chemical Industries, Ltd.
- Applicants: Nissan Chemical Industries, Ltd.
- Inventors: Tadayuki ISAJI; Naoki OTANI; Masahiro UEDA; Takayoshi KAWASAKI
- Web page: https://patentgrep.com/patent/US20180022994A1

## CPC

- C09K 11/65: containing carbon (in organic compounds C09K11/06)
- C01B 32/184: Preparation
- C09K 11/08: containing inorganic luminescent materials
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}

## Abstract

Provided is a method for manufacturing a carbonaceous luminescent material in which a polycarboxylic-acid-containing starting material, an acid catalyst, and a solvent are mixed together and heated.

## Claims

### Claim 1

A method for manufacturing a carbonaceous luminescent material, comprising the step of mixing together and heating a polycarboxylic acid-containing starting material, an acid catalyst and a solvent.

### Claim 2 (depends on 1)

The method for manufacturing a carbonaceous luminescent material of claim 1, wherein the polycarboxylic acid is citric acid.

### Claim 3 (depends on 1, 2)

The method for manufacturing a carbonaceous luminescent material of claim 1 or 2, wherein the starting material further contains an amino group-containing compound.

### Claim 4 (depends on 3)

The method for manufacturing a carbonaceous luminescent material of claim 3, wherein the amino group-containing compound is an amino acid.

### Claim 5 (depends on 4)

The method for manufacturing a carbonaceous luminescent material of claim 4, wherein the amino acid is cysteine.

### Claim 6 (depends on 1)

The method for manufacturing a carbonaceous luminescent material of claim 1, wherein the acid catalyst is a heterogeneous acid catalyst formed as a porous body having pores.

### Claim 7 (depends on 1)

The method for manufacturing a carbonaceous luminescent material of claim 1, wherein a surfactant is further admixed.

### Claim 8 (depends on 1)

The method for manufacturing a carbonaceous luminescent material of claim 1, wherein the carbonaceous luminescent material has a graphene structure.

### Claim 9 (depends on 1)

The method for manufacturing a carbonaceous luminescent material of claim 1, wherein the carbonaceous luminescent material emits light having a wavelength of from 380 to 480 nm.