Method for producing core-shell structure including CdSe core based on glyme solvent and core-shell structure including CdSe core produced thereby

Patent metadata

Field	Value
Publication number	US-11421155-B2
Application number	US-201716301283-A
Country	US
Kind code	B2
Filing date	May 19, 2017
Priority date	May 25, 2016
Publication date	Aug 23, 2022
Grant date	Aug 23, 2022

Abstract

The present invention relates to a method for producing a core-shell structure including a CdSe core based on a glyme solvent. The method of the present invention enables the production of a core-shell structure including a CdSe core in a simple and economical manner. The present invention also relates to a core-shell structure including a CdSe core produced by the method. The core-shell structure of the present invention includes a large amount of CdSe and is uniform in size. Particularly, the core-shell structure of the present invention can be coated on a flexible plastic substrate of an optical device or semiconductor device due to its high stability.

First claim

What is claimed is:

1. A method for producing a core-shell structure comprising a CdSe core and sequential layers of CdS, ZnCdS, and ZnS shells, wherein the core-shell structure emits a blue light, a green light, an orange light, or a red light, the method comprising the steps of:
a) dissolving a Cd precursor and a Zn precursor in a glyme solvent and stirring the solution,
b) adding 1-octadecene and oleic acid to the solution of step a) and primarily heating the mixture with stirring,
c) secondarily heating the solution of step b), and
d) dissolving a Se powder in trioctylphosphine (TOP), dissolving a S powder in trioctylphosphine (TOP), and adding dropwise the Se-TOP solution and the S-TOP solution to the solution of step c),
wherein the molar ratio of Cd present in the Cd precursor to Zn present in the Zn precursor is adjusted to 1:20 in step a) and the molar ratio of Se present in the Se-TOP solution to S present in the S-TOP solution is adjusted to 1:20 in step d) to produce a blue light emitting core-shell structure,
wherein the molar ratio of Cd present in the Cd precursor to Zn present in the Zn precursor is adjusted to 1:10 in step a) and the molar ratio of Se present in the Se-TOP solution to S present in the S-TOP solution is adjusted to 1:10 in step d) to produce a green light emitting core-shell structure, and
wherein the molar ratio of Cd present in the Cd precursor to Zn present in the Zn precursor is adjusted to 1:4 in step a) and the molar ratio of Se present in the Se-TOP solution to S present in the S-TOP solution is adjusted to 1:10 in step d) to produce an orange or red light emitting core-shell structure.

2. The method according to claim 1 , wherein the Cd precursor is selected from the group consisting of CdO, CdF, CdCl, CdBr, CdI, CdS, Cd(CH 3 CO 2 ) 2 , Cd(OH) 2 , Cd(NO 3 ) 2 , Cd(CN) 2 , and mixtures thereof and the Zn precursor is selected from the group consisting of ZnF 2 , ZnCl 2 , ZnBr 2 , ZnI 2 , Zn(NO 3 ) 2 , Zn(ClO 3 ) 2 , ZnSO 4 , Zn 3 (PO 4 ) 2 , Zn(O 2 CCH 3 ) 2 , and mixtures thereof.

3. The method according to claim 1 , wherein the glyme solvent used in step a) is selected from the group consisting of monoglyme, diglyme, triglyme, tetraglyme, and mixtures thereof.

4. The method according to claim 1 , wherein, in step b), the primary heating with stirring is performed at 120° C. to 160° C. for 10 minutes to 30 minutes.

5. The method according to claim 1 , wherein, in step c), the secondary heating is performed at 270° C. to 330° C. for 10 minutes to 30 minutes.

6. The method according to claim 1 , wherein the Se-TOP solution and the S-TOP solution are sequentially added dropwise in step d) to produce an orange or red light emitting core-shell structure.

7. The method according to claim 6 , wherein the S-TOP solution is added dropwise 10 minutes after dropwise addition of the Se-TOP solution in step d) to produce an orange light emitting core-shell structure.

8. The method according to claim 6 , wherein the S-TOP solution is added dropwise 30 seconds after dropwise addition of the Se-TOP solution in step d) to produce a red light emitting core-shell structure.

Assignees

• Univ Korea Res & Business Foundation Sejong Campus

Inventors

• Yi Seung Jun
• Kang Sang Ook
• Son Ho-Jin

Classifications

• B01J13/0026

  containing a liquid organic phase · CPC title

• C09K11/883 Primary

  with zinc or cadmium · CPC title

• B01J19/0013

  Controlling the temperature of the process · CPC title

• C09K11/02 Primary

  Use of particular materials as binders, particle coatings or suspension media therefor · CPC title

• C09K11/88

  containing selenium, tellurium or unspecified chalcogen elements · CPC title