White light quantum dot complex particle and process for preparing same

Patent metadata

Field	Value
Publication number	US-9257600-B2
Application number	US-201314368159-A
Country	US
Kind code	B2
Filing date	Nov 14, 2013
Priority date	Aug 16, 2013
Publication date	Feb 9, 2016
Grant date	Feb 9, 2016

Abstract

A white light quantum dot complex particle, comprising a seed particle ( 1 ) in the core, and a first shell layer ( 2 ), a second shell layer ( 3 ) and a third shell layer ( 4 ) wrapped around the seed particle ( 1 ) in order; in the first shell layer ( 2 ), the second shell layer ( 3 ) and the third shell layer ( 4 ) are one of a red light quantum dot layer, a green light quantum dot layer and a blue light quantum dot layer respectively, and are different from one another. Also disclosed is the process for preparing the white light quantum dot complex particle.

First claim

The invention claimed is:

1. A white light quantum dot complex particle, comprising a seed particle in a core, and a first shell layer, a second shell layer and a third shell layer wrapped around the seed particle in order,
wherein in the first shell layer, the second shell layer and the third shell layer are respectively one of a red light quantum dot layer, a green light quantum dot layer and a blue light quantum dot layer, and are different from one another;
wherein the seed particle has a particle size of 10-500 nm, and a range of a thickness of the first shell layer, the second shell layer and the third shell layer is 5-50 nm;
a ratio of amounts of the red light, green light and blue light quantum dots in the complex particle is 0.5˜0.8: 1:1.2˜1.5;
the red light quantum dots comprise CdSe quantum dots with an emission wavelength of 600˜700 nm; the green light quantum dots comprise CdSe quantum dots with an emission wavelength of 490˜570 nm; and the blue light quantum dots comprise CdSe quantum dots with an emission wavelength of 430˜460 nm.

2. The white light quantum dot complex particle according to claim 1 , wherein the seed particle is a silicon dioxide nanoparticle, an Al 2 O 3 nanoparticle or a ZnO nanoparticle.

3. The white light quantum dot complex particle according to claim 1 , wherein the seed particle is a silicon dioxide nanoparticle having its surface modified with polymerizable double bonds.

4. The white light quantum dot complex particle according to claim 1 , wherein the seed particle has a particle size of 20-50 nm; and a range of a thickness of the first shell layer, the second shell layer and the third shell layer is 10-20 nm.

5. The white light quantum dot complex particle according to claim 1 , wherein the ratio of amount of the red light, green light and blue light quantum dots in the complex particle is 0.65˜0.74:1:1.25˜1.35.

6. The white light quantum dot complex particle according to claim 1 , wherein the red light quantum dots comprise CdSe quantum dots with an emission wavelength of 613 nm; the green light quantum dots comprise CdSe quantum dots with an emission wavelength of 555 nm; and the blue light quantum dots comprise CdSe quantum dots with an emission wavelength of 452 nm.

7. A process for preparing a white light quantum dot complex particle according to claim 1 , comprising:
dispersing a seed particle in water to obtain a seed suspension;
mixing red light quantum dots, green light quantum dots and blue light quantum dots with a monomer, an initiator, a surfactant and water, respectively, for emulsification to obtain three emulsion systems respectively, which are designated as the emulsion system A, the emulsion system B and the emulsion system C, respectively;
heating the seed suspension to 60-90° C., to which the emulsion system A is dripped, and then reacting with constant temperature for 2-10 h; then dripping the emulsion system B into the seed suspension, and then reacting with constant temperature for 2-10 h; then dripping the emulsion system C into the seed suspension, and then reacting with constant temperature for 2-10 h, to form the first shell layer, second shell layer and third shell layer in order; and
washing the product after conclusion of the reaction to obtain the white light quantum dot complex particle.

8. The preparative process according to claim 7 , wherein a weight percent concentration of the seed particle in the seed suspension is 5-8%.

9. The preparative process according to claim 8 , wherein the weight percent concentration of the seed particle in the seed suspension is 5.5-7%.

10. The preparative process according to claim 7 , wherein the monomer is at least one of the alkenes having a total of 4-24 carbon atoms, and a weight percentage of the monomer in each emulsion system is 0.1-20%.

11. The preparative process according to claim 10 , wherein the monomer is styrene, and the weight percentage of the monomer in each emulsion system is 0.2-10%.

12. The preparative process according to claim 7 , wherein the initiator is at least one of potassium persulfate, ammonium persulfate, sodium persulfate or hydrogen peroxide, and a weight percentage of the initiator is 0.1%-8% by weight of the monomer.

13. The preparative process according to claim 12 , wherein the initiator is at least one of potassium persulfate, ammonium persulfate, sodium persulfate or hydrogen peroxide, and a weight percentage of the initiator is 0.5%-4% by weight of the monomer.

14. The preparative process according to claim 7 , wherein the surfactant is at least one of sodium dodecyl sulfate, sodium dodecyl sulfonate or cetyltrimethylammonium bromide, and a weight percentage of the surfactant in each emulsion system is 0.1-10%.

15. The preparative process according to claim 14 , wherein the surfactant is sodium dodecyl sulfate, sodium dodecyl sulfonate or cetyltrimethylammonium bromide, and a weight percentage of the surfactant in each emulsion system is 0.5-5%.

16. The preparative process according to claim 7 , wherein a weight percentage of the red light quantum dots, the blue light quantum dots and the green light quantum dots in each emulsion system is 0.08-12%.

17. The preparative process according to claim 7 , wherein a weight ratio between the seed particle and the green light quantum dots is 10-12.5:1.

18. The preparative process according to claim 7 , wherein a rate for dripping each emulsion system is 0.01-5ml/min.

19. The preparative process according to claim 18 , wherein a rate for dripping each emulsion system is 0.1-0.5ml/min.

Assignees

• Boe Technology Group Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Tang Chen
• Gu Jingxia
• Wang Xuelan

Classifications

• C09K11/025 Primary

  non-luminescent particle coatings or suspension media · CPC title

• H10H20/813

  having a plurality of light-emitting regions, e.g. multi-junction LEDs or light-emitting devices having photoluminescent regions within the bodies · CPC title

• H10H20/012

  having light-emitting regions comprising only Group II-IV materials · CPC title

• H10H20/812 Primary

  within the light-emitting regions, e.g. having quantum confinement structures · CPC title

• H01L33/06 Primary

  Electricity · mapped topic