OLED display panel and electronic device comprising the same
The present invention relates to an OLED display panel comprising a first electrode, and a first hole transporting layer, a second hole transporting layer, and an electron transporting layer stacked on the first electrode, and a second electrode formed; at least two light emitting units are provided on the second hole transporting layer; the electron transporting layer covers the light emitting units; the material of the electron transporting layer fills the gap(s) between adjacent light emitting units; the first hole transporting layer comprises a hole transporting material which has a hole mobility of 9×10 −5 -5×10 −4 cm 2 /V·S, and a solubility of 10 g/L or more in a cleaning solvent at 25° C. The present invention utilizes a hole transporting material having a specific hole mobility as a common hole transporting layer, avoiding crosstalks between different pixels.
1. An OLED display panel, comprising:
a first electrode, a first hole transporting layer, a second hole transporting layer, an electron transporting layer and a second electrode stacked in sequence;
at least two light emitting units disposed between the second hole transporting layer and the electron transporting layer, wherein a material of the electron transporting layer fills a gap between adjacent light emitting units;
wherein the first hole transporting layer comprises a hole transporting material with a hole mobility in a range of 9×10 −5 to 5×10 −4 cm 2 /V·S; and
wherein the hole transporting material has a solubility of 10 g/L or more in a cleaning solvent at 25° C. during cleaning;
wherein the hole transporting material includes anyone of
and a combination of at least two of them.
2. The OLED display panel of claim 1 , wherein the cleaning solvent is anyone selected from the group consisting of N-methylpyrrolidone, cyclohexanone, substituted or unsubstituted furan, and isopropanol, and a mixture of at least two of them.
3. The OLED display panel of claim 1 , wherein the second hole transporting layer comprises at least two independent hole transporting units, wherein the independent hole transporting units are provided between the first hole transporting layer and the light emitting units.
4. The OLED display panel of claim 3 , one of the two independent hole transporting units is disposed between one of the two light emitting units and the first hole transporting layer.
5. The OLED display panel of claim 3 , wherein each hole transporting unit is independently selected to be the same as or different from the first hole transporting layer.
6. The OLED display panel of claim 1 , wherein a thickness of the first hole transporting layer is in the range of 600-2300 Å.
7. The OLED display panel of claim 1 , wherein the first hole transporting layer is doped with a P-type organic material in the hole transporting material.
8. The OLED display panel of claim 7 , wherein the p-type organic material has a doping ratio of 1 to 10 wt % in the first hole transporting layer.
9. The OLED display panel of claim 1 , wherein the at least two light emitting units are selected from the group consisting of a blue light emitting unit, a green light emitting unit and a red light emitting unit, or a combination of at least two of them.
10. The OLED display panel of claim 9 , wherein the green light emitting unit and the red light emitting unit each comprises a phosphorescent material, and wherein the blue light emitting unit comprises a fluorescent material.
11. The OLED display panel of claim 9 , wherein the OLED display panel has a red light external quantum efficiency of 16% or more, a green light external quantum efficiency of 16% or more, and a blue light external quantum efficiency of 10% or more.
12. The OLED display panel of claim 1 , wherein the second hole transporting layer comprises a red light independent hole transporting unit, a blue light independent hole transporting unit, and a green light independent hole transporting unit, wherein a red light emitting unit is provided on the red light independent hole transporting unit, a green light emitting unit is provided on the green light independent hole transporting unit, and a blue light emitting unit is provided on the blue light independent hole transporting unit.
13. The OLED display panel of claim 12 , wherein the red light independent hole transporting unit, the green light independent hole transporting unit and the blue light independent hole transporting unit are disposed on the first hole transporting layer.
14. The OLED display panel of claim 1 , wherein the first electrode is anode and the second electrode is cathode.
15. An electronic device comprising the OLED display panel of claim 1 .