Organic light-emitting diode display panel having the hole transport units corresponding to the light emitting devices of two different colors have different mobility

1. An organic light-emitting diode (OLED) display panel, comprising:

a first substrate;

a first electrode layer disposed on the first substrate and including a plurality of first electrodes;

a first hole transport layer disposed on a surface of the first electrode layer far away from the first substrate, and including a plurality of hole transport units, wherein the plurality of hole transport units are arranged in correspondence with the plurality of first electrodes respectively;

a plurality of light-emitting devices disposed on a surface of the first hole transport layer far away from the first electrode layer, wherein the plurality of the light-emitting devices are arranged in correspondence with the plurality of hole transport units respectively, the light-emitting devices include m number of colors, where m is a positive integer, one light-emitting device corresponds to one color, and the hole transport units corresponding to the light-emitting devices of two different colors have different mobility; and

a second electrode layer disposed on a surface of the plurality of light-emitting devices far away from the first hole transport layer.

2. The OLED display panel according to claim 1 , wherein:

the plurality of light-emitting devices further include a plurality of red light-emitting devices, a plurality of green light-emitting devices, and a plurality of blue light-emitting devices.

3. The OLED display panel according to claim 2 , wherein:

a mobility Mobility R of a hole transport unit corresponding to a red light-emitting device and a mobility Mobility G of a hole transport unit corresponding to a green light-emitting device are respectively smaller than a mobility Mobility B of a hole transport unit corresponding to a blue light-emitting device.

4. The OLED display panel according to claim 3 , wherein a ratio of Mobility B to Mobility G is approximately greater than or equal to 5.

5. The OLED display panel according to claim 4 , wherein a ratio of Mobility B to Mobility G is approximately greater than or equal to 10.

6. The OLED display panel according to claim 3 , wherein Mobility G is smaller than Mobility R .

7. The OLED display panel according to claim 6 , wherein a ratio of Mobility R to Mobility G is approximately greater than 1.

8. The OLED display panel according to claim 7 , wherein the ratio of Mobility R to Mobility G is approximately greater than 1.2.

9. The OLED display panel according to claim 2 , wherein a hole transport unit is formed by at least one of a first hole transport material and a second hole transport material.

10. The OLED display panel according to claim 9 , wherein the first hole transport material includes carbazole-containing compounds, and the second hole transport material includes triphenylamine-containing compounds.

11. The OLED display panel according to claim 10 , wherein:

the hole transport unit corresponding to the green light-emitting device is formed by the second hole transport material including a compound (2);

the hole transport unit corresponding to the blue light-emitting device is formed of the first hole transport material including a compound (1); and

the hole transport unit corresponding to the red light-emitting device is formed by mixing the first hole transport material including the compound (1) and the second hole transport material including the compound (2),

wherein the compound (1) is

and

the compound (2) is

12. The OLED display panel according to claim 2 , wherein:

both the red light-emitting device and the green light-emitting include phosphorescent materials; and

the blue light-emitting device includes fluorescent materials.

13. The OLED display panel according to claim 12 , wherein:

the red light-emitting device includes at least one first host material, and the at least one first host material includes carbazole-containing compounds;

the green light-emitting device includes at least two second host materials, and the at least two second host materials include carbazole-containing compounds; and

the blue light-emitting device includes at least two third host materials, and the at least two third host materials includes aromatic compounds.

14. The OLED display panel according to claim 1 , wherein the first electrode further includes at least:

a reflective film disposed on the first substrate and including silver; and

a transparent conductive film disposed on the surface of the reflective film far away from the first substrate, and including indium tin oxide or indium zinc oxide,

wherein the second electrode includes at least any one of a magnesium-silver alloy, a silver metal, a silver-ytterbium alloy, and a silver-rare earth metal alloy.

15. The OLED display panel according to claim 1 , wherein the first substrate is a ftexible substrate or a rigid substrate.

16. The OLED display panel according to claim 15 , wherein the flexible substrate includes polyimide or polyethylene terephthalate resin.

17. The OLED display panel according to claim 1 , further including:

a second hole transport layer disposed on a surface of the first electrode layer far away from the first substrate; and

an electron transport layer disposed on a surface of the plurality of light-emitting devices far away from the first hole transport layer.

18. The OLED display panel according to claim 17 , further including:

a hole blocking layer disposed between the plurality of light-emitting devices and the electron transport layer.

19. The OLED display panel according to claim 18 , wherein the hole blocking layer includes star-shaped aromatic compounds.

20. An organic light-emitting diode (OLED) display device, comprising the OLED display panel according to claim 1 .