Blue top emitting quantum dot light-emitting device and display apparatus

1. A blue top emitting quantum dot light-emitting device, comprising: a cathode and an anode oppositely arranged, a blue quantum dot light-emitting layer between the cathode and the anode, an electron transport layer between the cathode and the blue quantum dot light-emitting layer, and a hole transport layer between the blue quantum dot light-emitting layer and the anode; wherein:

a material of the blue quantum dot light-emitting layer is ZnSe 1-x :Te x /ZnSe/ZnS, wherein ZnSe 1-x :Te x means that a molar ratio of Se to Te is 1-x:x, and x is 0.03 to 0.07;

a thickness of the hole transport layer is 10 nm to 35 nm, a thickness of the electron transport layer is 25 nm to 50 nm, and a sum of thicknesses of the hole transport layer and the electron transport layer is 55 nm to 65 nm.

2. The blue top emitting quantum dot light-emitting device according to claim 1 , wherein x=0.03 to 0.04, and the thickness of the hole transport layer is less than the thickness of the electron transport layer.

3. The blue top emitting quantum dot light-emitting device according to claim 2 , wherein a luminescence peak of a photoluminescence spectrum corresponding to a maximum luminous intensity of the blue quantum dot light-emitting layer is 455 nm, and a luminescence peak of an electroluminescence spectrum corresponding to a maximum luminous intensity of the blue top emitting quantum dot light-emitting device is 460 nm.

4. The blue top emitting quantum dot light-emitting device according to claim 3 , wherein the thickness of the hole transport layer is 10 nm, and the thickness of the electron transport layer is 48 nm.

5. The blue top emitting quantum dot light-emitting device according to claim 3 , wherein the thickness of the hole transport layer is 25 nm, and the thickness of the electron transport layer is 35 nm.

6. The blue top emitting quantum dot light-emitting device according to claim 4 , further comprising a hole injection layer between the hole transport layer and the anode, wherein a distance between the cathode and the anode is 90 nm to 100 nm.

7. The blue top emitting quantum dot light-emitting device according to claim 3 , wherein the blue quantum dot light-emitting layer has a valence band position of −6.8 eV to −6.9 eV and a conduction band position of −3.8 eV to −3.9 eV.

8. The blue top emitting quantum dot light-emitting device according to claim 1 , wherein x=0.05 to 0.06, a luminescence peak of a photoluminescence spectrum corresponding to a maximum luminous intensity of the blue quantum dot light-emitting layer is 460 nm, and a luminescence peak of an electroluminescence spectrum corresponding to a maximum luminous intensity of the blue top emitting quantum dot light-emitting device is 475 nm.

9. The blue top emitting quantum dot light-emitting device according to claim 8 , further comprising a hole injection layer between the hole transport layer and the anode, wherein a distance between the cathode and the anode is 95 nm to 105 nm.

10. The blue top emitting quantum dot light-emitting device according to claim 8 , wherein the blue quantum dot light-emitting layer has a valence band position of −6.5 eV to −6.6 eV and a conduction band position of −3.7 eV to −3.8 eV.

11. The blue top emitting quantum dot light-emitting device according to claim 1 , wherein x=0.06 to 0.07, a luminescence peak of a photoluminescence spectrum corresponding to a maximum luminous intensity of the blue quantum dot light-emitting layer is 470 nm, and a luminescence peak of an electroluminescence spectrum corresponding to a maximum luminous intensity of the blue top emitting quantum dot light-emitting device is 485 nm.

12. The blue top emitting quantum dot light-emitting device according to claim 11 , further comprising a hole injection layer between the hole transport layer and the anode, wherein a distance between the cathode and the anode is 95 nm to 110 nm.

13. The blue top emitting quantum dot light-emitting device according to claim 11 , wherein the blue quantum dot light-emitting layer has a valence band position of −6.4 eV to −6.5 eV and a conduction band position of −3.6 eV to −3.7 eV.

14. The blue top emitting quantum dot light-emitting device claim 6 , wherein a thickness of the hole injection layer is 20 nm to 24 nm, and a thickness of the blue quantum dot light-emitting layer is 8 nm to 12 nm.

15. The blue top emitting quantum dot light-emitting device according to claim 14 , wherein the thickness of the hole injection layer is 22 nm, and the thickness of the blue quantum dot light-emitting layer is 10 nm.

16. The blue top emitting quantum dot light-emitting device according to claim 1 , wherein the hole transport layer has a valence band position of −5.8 eV and a conduction band position of −2.9 eV; and the electron transport layer has a valence band position of −7.36 eV and a conduction band position of −3.86 eV.

17. The blue top emitting quantum dot light-emitting device according to claim 1 , wherein the anode comprises a transparent conductive layer, a metal layer and a transparent conductive layer stacked, a material of the metal layer comprises Ag, a thickness of the metal layer is 80 nm to 120 nm, a material of the transparent conductive layer comprises indium tin oxide, and a thickness of the transparent conductive layer is 8 nm to 12 nm.

18. The blue top emitting quantum dot light-emitting device according to claim 1 , wherein a material of the cathode comprises Mg/Ag alloy, and a thickness of the cathode is 8 nm to 12 nm.

19. The blue top emitting quantum dot light-emitting device according to claim 1 , wherein the blue top emitting quantum dot light-emitting device is an upright structure.

20. A display apparatus, comprising a red quantum dot light-emitting device, a green quantum dot light-emitting device, and a blue top emitting quantum dot light-emitting device according to claim 1 .