Organic light-emitting diode display panel and organic light-emitting diode display device
An organic light-emitting diode (OLED) display panel and an OLED display device are provided. The OLED display panel comprises a first substrate; a first electrode layer disposed on the first substrate and including a plurality of first electrodes; a hole transport layer disposed on a surface of the first electrode layer far away from the first substrate, and formed by a first hole transport material and a second hole transport material having different carrier mobility; a plurality of light-emitting devices disposed on a surface of the hole transport layer far away from the first electrode layer and arranged in correspondence with the plurality of first electrodes respectively; an electron transport layer disposed on a surface of the plurality of light-emitting devices far away from the hole transport layer; and a second electrode layer disposed on a surface of the electron transport layer far away from the plurality of light-emitting devices.
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 hole transport layer disposed on a surface of the first electrode layer on a side away from the first substrate, and the hole transport layer being formed by a first hole transport material and a second hole transport material having different carrier mobility;
a plurality of light-emitting devices disposed on a surface of the hole transport layer on a side away from the first electrode layer and arranged in correspondence with the plurality of first electrodes respectively;
an electron transport layer disposed on a surface of the plurality of light-emitting devices on a side away from the hole transport layer; and
a second electrode layer disposed on a surface of the electron transport layer on a side away from the plurality of light-emitting devices.
2. The OLED display panel according to claim 1 , wherein:
an absolute value of a difference between a lowest unoccupied molecular orbital of the first hole transport material and a lowest unoccupied molecular orbital of the second hole transport material is greater than or equal to approximately 0.2 eV.
3. The OLED display panel according to claim 1 , wherein:
a ratio of a mobility of the first hole transport material to a mobility of the second hole transport material is greater than or equal to approximately 10.
4. The OLED display panel according to claim 1 , wherein:
the hole transport layer further includes a plurality of first hole transport units;
the plurality of first hole transport units are arranged in correspondence with the plurality of light-emitting devices, respectively; and
the plurality of light-emitting devices are disposed on a surface of the plurality of first hole transport units far away from the first electrode layer.
5. The OLED display panel according to claim 4 , wherein:
the plurality of light-emitting devices include m number of colors, where m is a positive integer great than or equal to 3;
one light-emitting device corresponds to one color;
the hole transport units corresponding to the light-emitting devices of at most (m-1) number of colors are formed by the first hole transport material or the second hole transport material; and
the hole transport units corresponding to the light-emitting devices of at least one color are formed by mixing the first hole transport material and the second hole transport material.
6. The OLED display panel according to claim 1 , wherein:
the light-emitting devices include m number of colors, where m is a positive integer great than or equal to 3;
one light-emitting device corresponds to one color; and
the light-emitting devices of at least one color each includes a second hole transport unit and a light-emitting unit, and the second hole transport unit is disposed on the hole transport layer on a side away from the first electrode layer.
7. The OLED display panel according to claim 6 , wherein:
the second hole transport unit is formed by at least one of the first hole transport material and the second hole transport material.
8. The OLED display panel according to claim 1 , wherein:
the first hole transport material includes a carbazole-containing compound or a triphenylamine-containing compound; and
the second hole transport material includes a carbazole-containing compound or a triphenylamine-containing compound.
9. The OLED display panel according to claim 8 , wherein:
the first hole transport material includes a compound having a chemical formula of
and the second hole transport material includes a compound having a chemical formula of
10. The OLED display panel according to claim 8 , wherein:
the first hole transport material includes a compound having a chemical formula of
and the second hole transport material includes a compound having a chemical formula of
11. The OLED display panel according to claim 1 , wherein:
the plurality of light-emitting devices include a plurality of red light-emitting devices, a plurality of green light-emitting devices, and a plurality of blue light-emitting devices.
12. The OLED display panel according to claim 11 , wherein:
the plurality of light-emitting devices further include a plurality of yellow light-emitting devices, or a plurality of white light-emitting devices.
13. The OLED display panel according to claim 11 , wherein:
a red light-emitting device comprises a white light-emitting element and a red filter film arranged in layers;
a green light-emitting device comprises a white light-emitting element and a green filter film arranged in layers; and
a blue light-emitting device comprises a white light-emitting element and a blue filter film arranged in layers.
14. The OLED display panel according to claim 11 , wherein:
both a red light-emitting device and a green light-emitting include a phosphorescent material; and
a blue light-emitting device includes a fluorescent material.
15. The OLED display panel according to claim 14 , wherein:
the red light-emitting device includes one type of first host material or two types of first host materials, and the first host material includes a carbazole-containing compound;
the green light-emitting device includes at least two types of second host materials, and the at least two types of second host materials include a carbazole-containing compound; and
the blue light-emitting device includes one type of third host material or two types of third host materials, and the third host material includes an aromatic compound.
16. 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 a surface of the reflective film on a side away from the first substrate, and including indium tin oxide or indium zinc oxide.
17. The OLED display panel according to claim 1 , 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.
18. The OLED display panel according to claim 1 , wherein:
the first substrate is a flexible substrate or a rigid substrate.
19. The OLED display panel according to claim 18 , wherein:
the flexible substrate includes polyimide or a polyethylene terephthalate resin.
20. An organic light-emitting diode (OLED) display device, comprising the OLED display panel according to claim 1 .