Organic light-emitting display panel and display device
Organic light-emitting display panel and device are provided for improving performance of the organic light-emitting device. The organic functional layer comprises an organic light-emitting layer and a first electron transmission layer between the cathode and the organic light-emitting layer. The first electron transmission layer comprises a first doping agent, and the first doping agent contains alkaline earth metal elements or rare earth metal elements. A second electron transmission layer is located between the first electron transmission layer and the organic light-emitting layer, and the second electron transmission layer is undoped with the first doping agent. A lowest unoccupied molecular orbital LUMO1 in the first electron transmission layer and a lowest unoccupied molecular orbital LUMO2 in the second electron transmission layer satisfy: |LUMO1−LUMO2|<0.18 eV. A highest occupied molecular orbital HOMO2 in the second electron transmission layer and a highest occupied molecular orbital HOMO3 of the organic light-emitting layer satisfy: |HOMO2−HOMO3|<1 eV.
1. An organic light-emitting display panel, comprising:
an array substrate comprising a plurality of driving elements;
a plurality of organic light-emitting components corresponding to the plurality of driving elements, wherein each of the plurality of organic light-emitting components comprises an anode, a cathode and an organic functional layer between the anode and the cathode, wherein the organic functional layer comprises an organic light-emitting layer and a first electron transmission layer between the cathode and the organic light-emitting layer, wherein the first electron transmission layer comprises a first doping agent, and the first doping agent contains an alkaline earth metal element or rare earth metal element,
wherein each of the plurality of organic light-emitting components further comprises a second electron transmission layer located between the first electron transmission layer and the organic light-emitting layer, and the second electron transmission layer is undoped with the first doping agent,
wherein a lowest unoccupied molecular orbital LUMO1 of an electron transmission matrix in the first electron transmission layer and a lowest unoccupied molecular orbital LUMO2 of an electron transmission matrix in the second electron transmission layer satisfy: |LUMO1−LUMO2|<0.18 eV,
wherein a highest occupied molecular orbital HOMO2 of the electron transmission matrix in the second electron transmission layer and a highest occupied molecular orbital HOMO3 of a host material of the organic light-emitting layer satisfy: |HOMO2−HOMO3|<1 eV,
wherein in at least one of the plurality of organic light-emitting components, the highest occupied molecular orbital HOMO2 of the electron transmission matrix in the second electron transmission layer and the highest occupied molecular orbital HOMO3 of the host material of the organic light-emitting layer satisfy: |HOMO2−HOMO3|>0.2 eV, and
wherein each of the plurality of organic light-emitting components further comprises a third electron transmission layer located between the first electron transmission layer and the second electron transmission layer, and a doping concentration of the first doping agent in the third electron transmission layer is less than a doping concentration of the first doping agent in the first electron transmission layer.
2. The organic light-emitting display panel according to claim 1 , wherein a highest occupied molecular orbital HOMO1 of the electron transmission matrix in the first electron transmission layer and the highest occupied molecular orbital HOMO2 of the electron transmission matrix in the second electron transmission layer satisfy: 0 eV<|HOMO1−HOMO2|<0.8 eV.
3. The organic light-emitting display panel according to claim 1 , wherein the lowest unoccupied molecular orbital LUMO2 of the electron transmission matrix in the second electron transmission layer and a lowest unoccupied molecular orbital LUMO3 of the host material of the organic light-emitting layer satisfy: |LUMO2−LUMO3|<0.8 eV.
4. The organic light-emitting display panel according to claim 1 , wherein the second electron transmission layer has a thickness d in a range of 2 nm<d<60 nm.
5. The organic light-emitting display panel according to claim 1 , wherein in a direction perpendicular to the organic light-emitting display panel, a thickness of the first electron transmission layer is larger than a thickness of the second electron transmission layer.
6. The organic light-emitting display panel according to claim 1 , wherein a doping volume ratio of the first doping agent in the first electron transmission layer is in a range of 0.5%-7%.
7. The organic light-emitting display panel according to claim 1 , wherein an electron mobility Em and a hole mobility Hm in the second electron transmission layer satisfy: Em>Hm*100.
8. The organic light-emitting display panel according to claim 1 , wherein the electron transmission matrix in the second electron transmission layer is made of a same material as that of the electron transmission matrix in the first electron transmission layer.
9. The organic light-emitting display panel according to claim 1 , wherein a material of the electron transmission matrix in the second electron transmission layer is different from a material of the electron transmission matrix in the first electron transmission layer.
10. The organic light-emitting display panel according to claim 1 , wherein a doping concentration of the first doping agent at a side of the third electron transmission layer close to the first electron transmission layer is larger than a doping concentration of the first doping agent at a side of the third electron transmission layer away from the first electron transmission layer.
11. The organic light-emitting display panel according to claim 1 , wherein an electron transmission matrix in the third electron transmission layer is made of a same material as that of the electron transmission matrix in the first electron transmission layer, or the electron transmission matrix in the third electron transmission layer is made of the same material as that of the electron transmission matrix in the second electron transmission layer.
12. The organic light-emitting display panel according to claim 1 , wherein in a direction perpendicular to the organic light-emitting display panel, a thickness of the second electron transmission layer is larger than a thickness of the third electron transmission layer.
13. The organic light-emitting display panel according to claim 1 , wherein the first doping agent comprises at least one element of Mg, Ga, Yb, Sm, Y, Tm, Gd, or Lu.
14. The organic light-emitting display panel according to claim 13 , wherein the first doping agent is an alkaline earth metal monomer or rare earth metal monomer.
15. The organic light-emitting display panel according to claim 13 , wherein the first doping agent is a metallic compound.
16. The organic light-emitting display panel according to claim 1 , wherein the plurality of organic light-emitting components comprises a red light-emitting component, a green light-emitting component and a blue light-emitting component, and
wherein a highest occupied molecular orbital HOMO31 of a host material in a red light-emitting layer of the red light-emitting component and a highest occupied molecular orbital HOMO2 of the electron transmission matrix in the second electron transmission layer satisfy: 0.2 eV<|HOMO2−HOMO31|<1 eV.
17. The organic light-emitting display panel according to claim 16 , wherein a highest occupied molecular orbital HOMO32 of a host material in a green light-emitting layer of the green light-emitting component and the highest occupied molecular orbital HOMO2 of the electron transmission matrix in the second electron transmission layer satisfy: 0.2 eV<|HOMO2−HOMO32|<1 eV.
18. The organic light-emitting display panel according to claim 16 , wherein a highest occupied molecular orbital HOMO33 of a host material in a blue light-emitting layer of the blue light-emitting component and the highest occupied molecular orbital HOMO2 of the electron transmission matrix in the second electron transmission layer satisfy: |HOMO2−HOMO33|<0.95 eV.
19. An organic light-emitting display device, comprising the organic light-emitting display panel according to claim 1 .