Organic light-emitting diode array substrate and display apparatus
An organic light-emitting diode (OLED) array substrate and a display apparatus are provided. The OLED array substrate includes a plurality of OLEDs; the OLED includes an anode, a light-emitting layer and a cathode which are provided sequentially; the light-emitting layers are divided into a plurality of types by color (that is, the light-emitting layers are configured for emitting light of a plurality of colors), and are made of a host material and a guest material doped in the host material; and the OLED further includes an exciton blocking layer provided between the cathode and the light-emitting layer and in contact with the light-emitting layer, which is made of a host material of one light-emitting layer, and the host material of the one light-emitting layer has the biggest highest occupied molecular orbital energy level and the biggest triplet state energy level in the host materials of all light-emitting layers.
1. An organic light-emitting diode (OLED) array substrate, comprising a plurality of OLEDs, each of the OLEDs including an anode, a light-emitting layer and a cathode which are provided in this order, the light-emitting layers of the OLEDs being configured for emitting light of a plurality of colors, each of the light-emitting layers configured for emitting light of the plurality of colors being made of a host material and a guest material doped in the host material, wherein each of the OLEDs further includes:
an exciton blocking layer provided between the cathode and the light-emitting layer and in contact with the light-emitting layer, the exciton blocking layer being made of a material same as a host material of one light-emitting layer in the light-emitting layers configured for emitting light of the plurality of colors, and the host material of the one light-emitting layer having a biggest highest occupied molecular orbital energy level and a biggest triplet state energy level among host materials of the light-emitting layers configured for emitting light of the plurality of colors.
2. The OLED array substrate according to claim 1 , wherein
the exciton blocking layer has a thickness from 1 nm to 50 nm.
3. The OLED array substrate according to claim 1 , wherein
the light-emitting layers of the OLEDs are divided into a red light-emitting layer, a green light-emitting layer and a blue light-emitting layer;
the exciton blocking layer is made of a material same as a host material of the blue light-emitting layer.
4. The OLED array substrate according to claim 3 , wherein
the green light-emitting layer and the blue light-emitting layer have a same host material.
5. The OLED array substrate according to claim 3 , wherein the host material of the blue light-emitting layer comprises at least one selected from the group consisting of bis(2-methyl-8-quinolinolato-N1,O8)-(1,1′-biphenyl-4-olato) aluminum, 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl) benzene, 4,7-diphenyl-1,10-phenanthroline, 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline, and 3-(biphenyl-4-yl)-5-(4-tert-butylphenyl)-4-phenyl-4H-1,2,4-triazole.
6. The OLED array substrate according to claim 3 , wherein
the blue light-emitting layer is a fluorescent light-emitting layer.
7. The OLED array substrate according to claim 3 , wherein the red light-emitting layer and the green light-emitting layer are phosphorescent light-emitting layers.
8. The OLED array substrate according to claim 1 , wherein each of the OLEDs further comprises:
a hole transport layer provided between the anode and the light-emitting layer; and
an electron transport layer provided between the cathode and the exciton blocking layer.
9. The OLED array substrate according to claim 8 , wherein each of the OLEDs further includes:
a hole injection layer provided between the hole transport layer and the anode; and
an electron injection layer provided between the electron transport layer and the cathode.
10. A display apparatus, comprising:
the OLED array substrate according to claim 1 .
11. The OLED array substrate according to claim 2 , wherein
the light-emitting layers of the OLEDs are divided into a red light-emitting layer, a green light-emitting layer and a blue light-emitting layer;
the exciton blocking layer is made of a material same as a host material of the blue light-emitting layer.
12. The OLED array substrate according to claim 2 , wherein each of the OLEDs further comprises:
a hole transport layer provided between the anode and the light-emitting layer; and
an electron transport layer provided between the cathode and the exciton blocking layer.
13. The display apparatus according to claim 10 , wherein
the exciton blocking layer has a thickness from 1 nm to 50 nm.
14. The display apparatus according to claim 10 , wherein
the light-emitting layers of the OLEDs are divided into a red light-emitting layer, a green light-emitting layer and a blue light-emitting layer;
the exciton blocking layer is made of a material same as a host material of the blue light-emitting layer.
15. The display apparatus according to claim 14 , wherein
the green light-emitting layer and the blue light-emitting layer have a same host material.
16. The display apparatus according to claim 14 , wherein the host material of the blue light-emitting layer comprises at least one selected from the group consisting of bis(2-methyl-8-quinolinolato-N1,O8)-(1,1′-biphenyl-4-olato) aluminum, 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl) benzene, 4,7-diphenyl-1,10-phenanthroline, 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline, and 3-(biphenyl-4-yl)-5-(4-tert-butylphenyl)-4-phenyl-4H-1,2,4-triazole.
17. The display apparatus according to claim 14 , wherein
the blue light-emitting layer is a fluorescent light-emitting layer.
18. The display apparatus according to claim 14 , wherein
the red light-emitting layer and the green light-emitting layer are phosphorescent light-emitting layers.
19. The display apparatus according to claim 10 , wherein each of the OLEDs further comprises:
a hole transport layer provided between the anode and the light-emitting layer; and
an electron transport layer provided between the cathode and the exciton blocking layer.
20. The display apparatus according to claim 19 , wherein each of the OLEDs further includes:
a hole injection layer provided between the hole transport layer and the anode; and
an electron injection layer provided between the electron transport layer and the cathode.