Quantum dot and manufacturing method for the same and application using the same

1. A quantum dot, comprising:

a core being at least one selected from the group consisting of a XII-XV group compound semiconductor nano-crystal, a XII-XVI group compound semiconductor nano-crystal, a XIII-XV group compound semiconductor nano-crystal and a XIII-XVI group compound semiconductor nano-crystal, wherein the core contains a cadmium element and a selenium element; and

a shell layer containing a zinc element and a sulfur element, and enclosing the core, wherein based on a total content of the cadmium element, the selenium element, the zinc element and the sulfur element of the quantum dot, a content of the zinc element is in a range of 51 at %-64 at %, a content of the sulfur element is in a range of 32 at %-38 at %.

2. The quantum dot according to claim 1 , wherein in the quantum dot, a content ratio of the zinc element to the sulfur element is in a range of 1.34-2.

3. The quantum dot according to claim 1 , wherein based on the total content of the cadmium element, the selenium element, the zinc element and the sulfur element of the quantum dot, a content of the cadmium element is in a range of 0.5 at %-5 at %, a content of the selenium element is in a range of 3 at %-16 at %.

4. The quantum dot according to claim 1 , wherein the shell layer has a thickness of 2 nm-8 nm.

5. The quantum dot according to claim 1 , wherein the shell layer comprises a secondary particle formed by conjoining primary particles.

6. The quantum dot according to claim 1 , wherein the shell layer has an irregular concave-convex outer surface.

7. A luminescent material, comprising the quantum dot according to claim 1 .

8. A light-emitting element, comprising:

a light source; and

an encapsulating material comprising the luminescent material according to claim 7 , wherein the encapsulating material covers the light source.

9. A display device, comprising the light-emitting element according to claim 8 , wherein the display device is at least one selected from the group consisting of a television, a digital photo camera, a digital video camera, a digital photo frame, a mobile phone, a notebook, a mobile computer, a computer screen, a portable game console, a portable information terminal, a portable audio player, a game console, a car display and a wearable device.

10. A quantum dot, comprising:

a core being at least one selected from the group consisting of a XII-XV group compound semiconductor nano-crystal, a XII-XVI group compound semiconductor nano-crystal, a XIII-XV group compound semiconductor nano-crystal and a XIII-XVI group compound semiconductor nano-crystal; and

a shell layer containing a zinc element and a sulfur element, and enclosing the core, wherein the core and the shell layer have a core-shell element, based on a total content of the core-shell element, a content of a zinc element of the core-shell element is in a range of 51 at %-64 at %, a content of a sulfur element of the core-shell element is in a range of 32 at %-38 at %.

11. The quantum dot according to claim 10 , wherein the core-shell element further comprises a cadmium element and a selenium element, based on a total content of the cadmium element, the selenium element, the zinc element and the sulfur element of the core-shell element, a content of the cadmium element is in a range of 0.5 at %-5 at %, a content of the selenium element is in a range of 3 at %-16 at %.

12. The quantum dot according to claim 10 , wherein in the quantum dot, a content ratio of the zinc element to the sulfur element is in a range of 1.34-2.

13. The quantum dot according to claim 10 , wherein the shell layer has a thickness of 2 nm-8 nm.

14. The quantum dot according to claim 10 , wherein the shell layer comprises a secondary particle formed by conjoining primary particles.

15. The quantum dot according to claim 10 , wherein the shell layer has an irregular concave-convex outer surface.

16. A light-emitting element, comprising:

a light source; and

an encapsulating material comprising a luminescent material, comprising the quantum dot according to claim 10 ,

wherein the encapsulating material covers the light source.

17. A display device, comprising the light-emitting element according to claim 16 , wherein the display device is at least one selected from the group consisting of a television, a digital photo camera, a digital video camera, a digital photo frame, a mobile phone, a notebook, a mobile computer, a computer screen, a portable game console, a portable information terminal, a portable audio player, a game console, a car display and a wearable device.

18. A method for manufacturing a quantum dot, comprising:

providing a core-shell solution, wherein the core-shell solution contains a core, the core is at least one selected from the group consisting of a XII-XV group compound semiconductor nano-crystal, a XII-XVI group compound semiconductor nano-crystal, a XIII-XV group compound semiconductor nano-crystal and a XIII-XVI group compound semiconductor nano-crystal;

providing a zinc element raw material solution, wherein the zinc element raw material solution has zinc acetate and a rest substance, the zinc acetate has a weight of Q mg, the rest substance has a volume of R mL, Q/R=150-400;

providing a sulfur element raw material solution; and

mixing the core-shell solution, the zinc element raw material solution, and the sulfur element raw material solution.

19. The method for manufacturing the quantum dot according to claim 18 , wherein the rest substance of the zinc element raw material solution comprises oleate and octadecene.

20. The method for manufacturing the quantum dot according to claim 18 , which is used for manufacturing the quantum dot according to claim 1 .