Organic light-emitting diode and display panel
The present disclosure provides an organic light-emitting diode and a display panel, the organic light-emitting diode including: a first electrode, a second electrode, a light-emitting layer, a hole blocking layer and an electron transport layer; the first electrode and the second electrode are oppositely arranged; the light-emitting layer is between the first electrode and the second electrode; the hole blocking layer is between the light-emitting layer and the second electrode; the electron transport layer is between the hole transport layer and the second electrode, wherein the energy level difference between the HOMO energy level of the hole blocking layer and the HOMO energy level of the light-emitting layer is larger than or equal to 0.1 eV, and the energy level difference between the HOMO energy level of the electron transport layer and the HOMO energy level of the hole blocking layer is larger than or equal to 0.1 eV.
1 . An organic light-emitting diode, comprising:
a first electrode;
a second electrode opposite to the first electrode;
a light-emitting layer between the first electrode and the second electrode;
a hole blocking layer between the light-emitting layer and the second electrode; and
an electron transport layer between the hole blocking layer and the second electrode,
wherein an energy level difference between a HOMO energy level of the hole blocking layer and a HOMO energy level of the light-emitting layer is larger than or equal to 0.1 eV; and
an energy level difference between a HOMO energy level of the electron transport layer and the HOMO energy level of the hole blocking layer is larger than or equal to 0.1 eV;
wherein the light-emitting layer comprises a blue luminescent material; and
wherein the blue luminescent material comprises a blue luminescent host material and a blue luminescent guest material, and a T1 energy level of the electron transport layer is higher than a T1 energy level of the hole blocking layer, the T1 energy level of the hole blocking layer is higher than a T1 energy level of the blue luminescent guest material, and the T1 energy level of the blue luminescent guest material is higher than a T1 energy level of the blue luminescent host material;
the blue luminescent host material comprises BH (9-(4-(naphthalen-1-yl)phenyl)-10-phenylanthracene) which has the following formula:
the blue luminescent guest material comprises BD (N1,N1,N6-tris(2,4-dimethylphenyl)-N6-(o-toyl)pyrene-1,6-diamine) which has the following formula:
the hole blocking layer comprises a material of TPBI which has the following formula:
and
the electron transport layer comprises an electron transport material having one of the following chemical formulas 1-1 to 1-8:
2 . The organic light-emitting diode according to claim 1 , wherein an energy level difference between a LUMO energy level of the electron transport layer and a LUMO energy level of the hole blocking layer is larger than or equal to 0.2 eV.
3 . The organic light-emitting diode according to claim 2 , wherein the LUMO energy of the hole blocking layer is less than a LUMO energy level of the blue luminescent host material.
4 . The organic light-emitting diode according to claim 1 , further comprising a hole injection layer, a hole transport layer, and an electron blocking layer, which are sequentially disposed between the first electrode and the light-emitting layer, and an electron injection layer between the electron transport layer and the second electrode.
5 . The organic light-emitting diode according to claim 4 , further comprising a light extraction layer on a side of the second electrode distal to the first electrode, wherein
the hole injection layer comprises a material of p-type doping F4TCNQ which has the following formula:
the hole transport layer comprises a material of m-MTDATA which has the following formula:
the electron blocking layer comprises a material of mCBP which has the following formula:
the light extraction layer comprises a light extraction material having one of the following chemical formulas 2-1 to 2-6:
6 . A display panel, comprising the organic light-emitting diode according to claim 1 .
7 . The organic light-emitting diode according to claim 1 , further comprising a light extraction layer on a side of the second electrode distal to the first electrode,
wherein the light extraction layer comprises a light extraction material having a following formula:
where L is selected from one of a single bond, a substituted or un-substituted arylene group having 6 to 18 carbon atoms, and a substituted or un-substituted heteroarylene group having 3 to 18 carbon atoms; and
Ar1, Ar2, Ar3 and Ar4 are independently selected from one of a substituted or un-substituted aryl group having 6 to 60 carbon atoms and a substituted or un-substituted heteroaryl group having 2 to 60 carbon atoms.
8 . The organic light-emitting diode according to claim 7 , wherein at least one of Ar1, Ar2, Ar3 and Ar4 is selected from a following group:
where R5, R6, R7 and R8 are selected from one of a substituted or un-substituted alkyl group having 1 to 30 carbon atoms and a substituted or un-substituted aryl group having 6 to 30 carbon atoms.
9 . The organic light-emitting diode according to claim 8 , wherein at least one pair of adjacent groups among R5, R6, R7, R8 are linked to form a ring.
10 . The organic light-emitting diode according to claim 7 , wherein the light extraction layer comprises a light extraction material having one of the following chemical formulas 2-1 to 2-6: