Display panel

A display panel comprising:

• a substrate;
• a first electrode provided on the substrate;
• a light-emitting functional layer arranged on a side of the first electrode away from the substrate, wherein the light-emitting functional layer comprises a first light-emitting layer, a charge generation layer, and a second light-emitting layer sequentially arranged on the first electrode, the first light-emitting layer comprises a first light-emitting sublayer, and the second light-emitting layer comprises a second light-emitting sublayer;
• and
• a second electrode arranged on a side of the second light-emitting layer away from the charge generation layer;
• wherein the first light-emitting sublayer has a first film compactness parameter, the first film compactness parameter is greater than or equal to a first threshold, the second light-emitting sublayer has a second film compactness parameter, and the second film compactness parameter is greater than or equal to a second threshold, and the first film compactness parameter and the second film compactness parameter are determined by an amount of change generated by the film under a unit force condition, and wherein the first film compactness parameter and the second film compactness parameter are characterized by atomic force microscopy;
• wherein the first film compactness parameter is calculated by the following formula:
• X1=ΔF1/ΔH1;
• wherein ΔF1 is a difference of different forces in a thickness direction of a film;
• ΔH1 is a thickness difference of a stressed portion of the film under the different forces;
• and
• the second film compactness parameter is calculated by the following formula:
• X2=ΔF2/ΔH2;
• wherein ΔF2 is a difference of different forces in a thickness direction of a film;
• ΔH2 is a thickness difference of a stressed portion of the film under the different forces;
• wherein the first threshold is −1.7, and the first film compactness parameter is less than 0;
• and
• the second threshold is −1.7, and the second film compactness parameter is less than 0;
• wherein the first light-emitting layer comprises a first hole injection sublayer, a first hole transport sublayer, the first light-emitting sublayer, a first electron transport sublayer, and a first electron injection sublayer stacked sequentially;
• and
• the second light-emitting layer comprises a second hole injection sublayer, a second hole transport sublayer, the second light-emitting sublayer, a second electron transport sublayer, and a second electron injection sublayer stacked sequentially;
• and
• wherein the first light-emitting sublayer is doped with an organic light-emitting material with a dosage concentration being less than 2%, and a thickness of the first light-emitting sublayer ranges from 10 nm to 30 nm;
• the second light-emitting sublayer is doped with an organic light-emitting material with a dosage concentration being less than 2%, and a thickness of the second light-emitting sublayer ranges from 10 nm to 30 nm.

A display panel, comprising:

• a substrate;
• a first electrode provided on the substrate;
• and
• a light-emitting functional layer arranged on a side of the first electrode away from the substrate, wherein the light-emitting functional layer comprises a first light-emitting layer, a charge generation layer, and a second light-emitting layer sequentially arranged on the first electrode, the first light-emitting layer comprises a first light-emitting sublayer, and the second light-emitting layer comprises a second light-emitting sublayer;
• and
• a second electrode arranged on a side of the second light-emitting layer away from the charge generation layer;
• wherein the first light-emitting layer comprises a first hole injection sublayer, a first hole transport sublayer, the first light-emitting sublayer, a first electron transport sublayer, and a first electron injection sublayer stacked sequentially;
• and
• the second light-emitting layer comprises a second hole injection sublayer, a second hole transport sublayer, the second light-emitting sublayer, a second electron transport sublayer, and a second electron injection sublayer stacked sequentially;
• wherein the charge generation layer comprises a first charge generation layer and a second charge generation layer, the first charge generation layer is arranged on a side of the first light-emitting layer away from the first electrode, the first charge generation layer comprises an n-type charge generation material, the second charge generation layer is arranged on a side of the first charge generation layer away from the first light-emitting layer, and the second charge generation layer comprises a p-type charge generation material;
• wherein the n-type charge generation material comprises TPBi doped with 5% Yb, and a thickness of the first charge generation layer is 100 nm;
• the p-type charge generation material comprises NPB doped with 5% HATCN, and a thickness of the second charge generation layer is 100 nm;
• wherein the first light-emitting sublayer is doped with an organic light-emitting material with a dosage concentration being less than 2%, and a thickness of the first light-emitting sublayer ranges from 10 nm to 30 nm;
• the second light-emitting sublayer is doped with an organic light-emitting material with a dosage concentration being less than 2%, and a thickness of the second light-emitting sublayer ranges from 10 nm to 30 nm;
• and
• wherein the second electrode is doped with Mg with a dosage concentration being 9%, and a thickness of the second electrode ranges from 10 nm to 50 nm.