Compound, light extraction material and organic electroluminescent device

Abstract

The present application provides a compound of general formula (I), and the compound can be used in light extraction materials. Pyridine and connected aromatic groups in the parent nucleus structure of the compound have good planarity, and the compound can be used as a light extraction material to improve the luminous efficiency of an organic electroluminescent device. The invention further provides an organic electroluminescent device and a display device.

Description

technical field

[0001] The present application relates to the field of organic light-emitting display technology, in particular to a compound, a light extraction material and an organic electroluminescent device. Background technique

[0002] An organic electroluminescent device is a multilayer organic thin-film structure in which the light-emitting layer is located between the cathode and anode. After electrification, the light emitted by the light-emitting layer is transmitted from the side of the transparent electrode, and the light is lost due to waveguide effects such as total reflection between the various film layers. Adding a layer of light extraction layer with high refractive index on the transparent electrode can greatly improve the light extraction efficiency.

[0003] The light extraction layer may be an inorganic compound or an organic compound. Inorganic compounds are characterized by high refractive index, which is beneficial for light extraction, but the c...

Examples

Embodiment 1

[0170] A reflective anode electrode is set on the glass substrate, the anode electrode is an ITO electrode, and the thickness of the electrode is 130nm;

[0171] Then, vacuum-deposit a hole injection layer with a thickness of 10 nm on the anode electrode. The material of the hole injection layer is HT-21 and a p-type dopant p-3 with a mass ratio of 3%, wherein the evaporation rate is 0.1 nm / s, the selected hole injection layer material and p-type dopant are the following materials:

[0172]

[0173] Then, a hole transport layer of 112 nm is vacuum-evaporated on the hole injection layer, the material of the hole transport layer is the above-mentioned HT-32, wherein the evaporation rate is 0.1 nm / s;

[0174] Then, on the hole transport layer, the luminescent layer is vacuum-evaporated. The luminescent layer includes the host material BH-37 and the luminescent dye BD05. It is evaporated by multi-source co-evaporation, wherein the evaporation of the host material BH-37 is adjus...

Embodiment 2-5

[0183] Except that the thickness of the light extraction layer was changed as shown in Table 1, the rest was the same as in Example 1.

Embodiment 6

[0185] Except that the luminescent host material and the luminescent dye were replaced by GPH-77 and GD05, the rest was the same as that of Example 1.

[0186]

[0187] The organic electroluminescence device of this embodiment emits green light.

technical field

[0001] The present application relates to the field of organic light-emitting display technology, in particular to a compound, a light extraction material and an organic electroluminescent device. Background technique

[0002] An organic electroluminescent device is a multilayer organic thin-film structure in which the light-emitting layer is located between the cathode and anode. After electrification, the light emitted by the light-emitting layer is transmitted from the side of the transparent electrode, and the light is lost due to waveguide effects such as total reflection between the various film layers. Adding a layer of light extraction layer with high refractive index on the transparent electrode can greatly improve the light extraction efficiency.

[0003] The light extraction layer may be an inorganic compound or an organic compound. Inorganic compounds are characterized by high refractive index, which is beneficial for light extraction, but the c...

Examples

Embodiment 1

[0170] A reflective anode electrode is set on the glass substrate, the anode electrode is an ITO electrode, and the thickness of the electrode is 130nm;

[0171] Then, vacuum-deposit a hole injection layer with a thickness of 10 nm on the anode electrode. The material of the hole injection layer is HT-21 and a p-type dopant p-3 with a mass ratio of 3%, wherein the evaporation rate is 0.1 nm / s, the selected hole injection layer material and p-type dopant are the following materials:

[0172]

[0173] Then, a hole transport layer of 112 nm is vacuum-evaporated on the hole injection layer, the material of the hole transport layer is the above-mentioned HT-32, wherein the evaporation rate is 0.1 nm / s;

[0174] Then, on the hole transport layer, the luminescent layer is vacuum-evaporated. The luminescent layer includes the host material BH-37 and the luminescent dye BD05. It is evaporated by multi-source co-evaporation, wherein the evaporation of the host material BH-37 is adjus...

Embodiment 2-5

[0183] Except that the thickness of the light extraction layer was changed as shown in Table 1, the rest was the same as in Example 1.

Embodiment 6

[0185] Except that the luminescent host material and the luminescent dye were replaced by GPH-77 and GD05, the rest was the same as that of Example 1.

[0186]

[0187] The organic electroluminescence device of this embodiment emits green light.

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