Light-emitting device and display panel

1. A light-emitting device, wherein a light-emitting color of the light-emitting device is a primary color of either red or green, and the light-emitting device comprises:

a light-emitting layer comprising a host material, and

a compensation layer for carrying holes and disposed on a hole injection side of the light-emitting layer;

wherein the light-emitting device has a starting state and an operating state, and a starting voltage of the light-emitting device in the starting state is lower than an operating voltage of the light-emitting device in the operating state;

wherein, in the starting state, there is a first activation energy difference value ΔEa1 between activation energies of the host material and the compensation layer, and the first activation energy difference value ΔEa1<0 eV;

wherein the light-emitting device further comprises a hole transport layer disposed on the hole injection side of the light-emitting layer, and the compensation layer is disposed between the hole transport layer and the light-emitting layer;

wherein, in the starting state, the activation energy of the compensation layer is higher than activation energies of the hole transport layer and the host material; and

wherein in the starting state, there is a second activation energy difference value ΔEa2 between activation energies of the compensation layer and the hole transport layer, and a value range of the second activation energy difference value ΔEa2 is 0.2 eV˜0.3 eV.

2. The light-emitting device according to claim 1 , wherein a value of the first activation energy difference value ΔEa1 is −0.12 eV˜−0.08 eV.

3. The light-emitting device according to claim 1 , wherein the light-emitting device further comprises:

a hole injection layer disposed on the hole injection side of the light-emitting layer, wherein along a hole injection direction of the light-emitting layer, the hole injection layer, the hole transport layer and the compensation layer are successively stacked.

4. The light-emitting device according to claim 1 , wherein

the light-emitting layer further comprises a guest material doped in the host material.

5. A display panel comprising the light-emitting device according to claim 1 .

6. A light-emitting device, wherein a light-emitting color of the light-emitting device is a primary color of either red or green, and the light-emitting device comprises:

a light-emitting layer comprising a host material, and

a compensation layer for carrying holes and disposed on a hole injection side of the light-emitting layer;

wherein the light-emitting device has a starting state and an operating state, and a starting voltage of the light-emitting device in the starting state is lower than an operating voltage of the light-emitting device in the operating state;

wherein, in the starting state, there is a first activation energy difference value ΔEa1 between activation energies of the host material and the compensation layer, and the first activation energy difference value ΔEa1<0 eV;

wherein the light-emitting device further comprises a hole transport layer disposed on the hole injection side of the light-emitting layer, and the compensation layer is disposed between the hole transport layer and the light-emitting layer;

wherein, in the starting state, the activation energy of the compensation layer is higher than activation energies of the hole transport layer and the host material; and

wherein, in the starting state, there is a third activation energy difference value ΔEa3 between activation energies of the host material and the hole transport layer, and a value range of the ΔEa3 is 0.1 eV˜0.2 eV.

7. A display panel comprising the light-emitting device according to claim 6 .

8. A light-emitting device, wherein a light-emitting color of the light-emitting device is a primary color of either red or green, and the light-emitting device comprises:

a light-emitting layer comprising a host material, and

a compensation layer for carrying holes and disposed on a hole injection side of the light-emitting layer;

wherein the light-emitting device has a starting state and an operating state, and a starting voltage of the light-emitting device in the starting state is lower than an operating voltage of the light-emitting device in the operating state;

wherein, in the starting state, there is a first activation energy difference value ΔEa1 between activation energies of the host material and the compensation layer, and the first activation energy difference value ΔEa1<0 eV; and

wherein, in the operating state, there is a fourth activation energy difference value ΔEa4 between activation energies of the host material and the compensation layer, and the fourth activation energy difference value ΔEa4>0 eV.

9. The light-emitting device according to claim 8 , wherein the activation energy of the compensation layer is between the activation energies of the hole transport layer and the host material.

10. The light-emitting device according to claim 8 , wherein a value range of the fourth activation energy difference value ΔEa4 is 0 eV˜0.05 eV.

11. The light-emitting device according to claim 9 , wherein

in the operating state, the activation energy of the hole transport layer stacked on a hole injection side of the compensation layer is lower than the activation energy of the compensation layer.

12. The light-emitting device according to claim 11 , wherein

in the operating state, there is a fifth activation energy difference value ΔEa5 between the activation energies of the compensation layer and the hole transport layer, and a value range of the fifth activation energy difference value ΔEa5 is 0.08 eV˜0.12 eV.

13. The light-emitting device according to claim 12 , wherein in the operating state, there is a sixth activation energy difference value ΔEa6 between the activation energies of the host material and the hole transport layer, and a value range of the sixth activation energy difference value ΔEa6 is 0.1 eV˜0.2 eV.

14. A display panel comprising the light-emitting device according to claim 8 .