Compound, display panel and display apparatus
The present disclosure belongs to the technical field of organic light-emitting diods (OLEDs), and provides a compound used as an electron transmission material of OLEDs. Molecules of the compounds include an aromatic ring (or aromatic fused ring) and a phenanthroline group that are connected to each other. In an embodiment, the compound according to the present disclosure includes two types of groups, i.e., an aromatic ring (or aromatic fused ring) and a phenanthroline (or benzoquinoline) group. These two groups not only have good electron accepting ability, but also can be well doped with metals. The planarity of the two groups is conducive to the stacking of molecules, which facilitates the combination of holes and electrons and generates excitons, thereby increasing the electron mobility of the material and improving efficiency of device.
1. A compound, having a general structure according to [Chemical Formula 1]:
wherein A has a structure according to [Chemical Formula 2-1] or [Chemical Formula 2-2]:
B has a structure according to [Chemical Formula 3-1] or [Chemical Formula 3-2]:
L is selected from the group as follows:
q, s, t and u are each an integer independently selected from 1 or 2;
m, n and p are each an integer independently selected from 1 or 2;
in the above [Chemical Formula 2-1] or [Chemical Formula 2-2], Y 1 and Y 2 are each independently a nitrogen atom; and R 1 to R 5 and R 7 are each independently a hydrogen atom or benzyl;
R 9 -R 12 are each independently hydrogen, or pyridyl;
in the above [Chemical Formula 3-1], X 1 -X 5 are each independently a carbon atom or a nitrogen atom, and only one of X 1 -X 5 is a nitrogen atom, X 6 is a carbon atom; and X 7 -X 11 are each independently selected from a carbon atom and a nitrogen atom, and only one of X 7 -X 11 is a nitrogen atom;
in the above [Chemical Formula 3-2], X 12 -X 14 are each independently a carbon atom or a nitrogen atom, only one of X 12 -X 14 is a nitrogen atom, X 15 is a carbon atom; X 16 -X 18 are each independently selected from a carbon atom and a nitrogen atom, only one of X 16 -X 18 is a nitrogen atom; and Ar 1 and Ar 2 are each a fused benzene ring; and
# indicates a bonding position.
2. The compound according to claim 1 , wherein among X 1 -X 5 and X 7 -X 11 , X 2 and X 10 are each a nitrogen atom, and X 1 -X 3 -X 5 , X 7 -X 9 and X 11 are each a carbon atom.
3. The compound according to claim 1 , wherein among R 1 -R 5 and R 7 , R 3 is benzyl, and R 1 , R 2 , R 4 , R 5 and R 7 are each independently a hydrogen atom.
4. The compound according to claim 1 , wherein L is any one of the following groups:
and
B is any one of the following groups:
5. The compound according to claim 1 , wherein the compound is selected from any one of the following compounds:
6. The compound according to claim 1 , wherein the compound has a glass transition temperature greater than or equal to 120° C.
7. A display panel, comprising an organic light-emitting device, wherein the organic light-emitting device comprises an anode, a cathode opposite to the anode, an electron transmission layer, an electron injection layer, and a light-emitting layer that are disposed between the anode and the cathode, wherein a material of the electron transmission layer and/or a material of the electron injection layer comprise one or more of compounds according to claim 1 .
8. The display panel according to claim 7 , wherein an energy level difference between a lowest unoccupied molecular orbital (LUMO) energy level value of a material of the electron transmission layer and a LUMO energy level value of a material of the light-emitting layer or the electron injection layer is smaller than 0.2 eV; and a highest occupied molecular orbital (HOMO) energy level of the material of the electron transmission layer is at least 0.3 eV higher than a HOMO level value of the material of the electron injection layer.
9. The display panel according to claim 8 , wherein the electron injection layer further comprises a doped metal.
10. The display panel according to claim 9 , wherein the doped metal is selected from the group consisting of sodium, potassium, calcium, cesium, ytterbium, and combinations thereof.
11. The display panel according to claim 9 , wherein a content of the doped metal in the electron injection layer is 1 wt % to 5 wt %.
12. The display panel according to claim 9 , wherein a content of the doped metal in the electron injection layer is 3 wt %.
13. A display apparatus comprising the display panel according to claim 7 .