Organic light-emitting structure and display device
An organic light-emitting structure is described herein. The organic light emitting structure includes a first light-emitting unit, a second light-emitting unit, a third light-emitting unit, and a fourth light-emitting unit. An emission wavelength of the first light-emitting unit, an emission wavelength of the second light-emitting unit, an emission wavelength of the third light-emitting unit, and an emission wavelength of the fourth light-emitting unit successively increase. Each of a luminous efficiency of the second light-emitting unit, and a luminous efficiency of the third light-emitting unit is greater than each of a luminous efficiency of the first light-emitting unit and a luminous efficiency of the fourth light-emitting unit. The color gamut range of the organic light-emitting structure is increased, the color saturation of the light-emitting device is improved, and quantity of colors is increased, so that the development trend of color reproducibility for the display devices can be satisfied.
1. An organic light-emitting structure, comprising:
a first light-emitting unit,
a second light-emitting unit,
a third light-emitting unit, and
a fourth light-emitting unit,
wherein each of the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and the fourth light-emitting unit comprises a first electrode, a second electrode, and an organic laminated body placed between the first electrode and the second electrode, and one of the first electrode and the second electrode is a translucent electrode;
an emission wavelength of the first light-emitting unit, an emission wavelength of the second light-emitting unit, an emission wavelength of the third light-emitting unit, and an emission wavelength of the fourth light-emitting unit successively increase; and
each of a luminous efficiency of the second light-emitting unit and a luminous efficiency of the third light-emitting unit is greater than each of a luminous efficiency of the first light-emitting unit and a luminous efficiency of the fourth light-emitting unit,
wherein the organic laminated body comprises a common hole injection layer, a common hole transmission layer, a monochromic hole transmission layer, a light-emitting layer, and a common electron transmission layer; the common hole injection layer, the common hole transmission layer, the monochromic hole transmission layer, the light-emitting layer, and the common electron transmission layer are successively stacked; and the common hole injection layer is closer to the first electrode than the common electron transmission layer;
wherein the monochromic hole transmission layer of the first light-emitting unit is a first monochromic hole transmission layer; the monochromic hole transmission layer of the second light-emitting unit is a second monochromic hole transmission layer; the monochromic hole transmission layer of the third light-emitting unit is a third monochromic hole transmission layer; the monochromic hole transmission layer of the fourth light-emitting unit is a fourth monochromic hole transmission layer; and
wherein a thickness of the first monochromic hole transmission layer, a thickness of the second monochromic hole transmission layer, a thickness of the third monochromic hole transmission layer, and a thickness of the fourth monochromic hole transmission layer successively increase.
2. The organic light-emitting structure according to claim 1 , a sum of an area of the light-emitting layer of the second light-emitting unit and an area of the light-emitting layer of the third light-emitting unit is smaller than a sum of an area of the light-emitting layer of the first light-emitting unit and an area of the light-emitting layer of the fourth light-emitting unit.
3. The organic light-emitting structure according to claim 1 , wherein the first light-emitting unit is a blue-light emitting unit; the second light-emitting unit is a green-light emitting unit; the third light-emitting unit is a yellow-light emitting unit; and the fourth light-emitting unit is a red-light emitting unit.
4. The organic light-emitting structure according to claim 3 , wherein the first light-emitting unit is a fluorescent light-emitting unit; the second light-emitting unit, the third light-emitting unit, and the fourth light-emitting unit are phosphorescent light-emitting units.
5. The organic light-emitting structure according to claim 3 , wherein the organic light-emitting structure emits white light by at least one of:
the first light-emitting unit, the second light-emitting unit, and the fourth light-emitting unit emitting light at the same time; and
the first light-emitting unit and the third light-emitting unit emitting light at the same time.
6. The organic light-emitting structure according to claim 3 , wherein at least one of the first light-emitting unit and the fourth light-emitting unit is placed between the second light-emitting unit and the third light-emitting unit.
7. The organic light-emitting structure according to claim 1 , wherein each of the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and the fourth light-emitting unit further comprises a thin film transistor, the thin film transistor of the first light-emitting unit is used for controlling light emission of the first light-emitting unit, the thin film transistor of the second light-emitting unit is used for controlling light emission of the second light-emitting unit, the thin film transistor of the third light-emitting unit is used for controlling light emission of the third light-emitting unit, and the thin film transistor of the fourth light-emitting unit is used for controlling light emission of the fourth light-emitting unit.
8. The organic light-emitting structure according to claim 1 , wherein each of the organic laminated body of the first light-emitting unit, the organic laminated body of the second light-emitting unit, the organic laminated body of the third light-emitting unit, and the organic laminated body of the fourth light-emitting unit is an organic laminated body for emitting white light;
each of the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and the fourth light-emitting unit further comprises a light filter, the light filter is placed on one side of the translucent electrode away from the organic laminated body, and colors of the light filter of the first light-emitting unit, the light filter of the second light-emitting unit, the light filter of the third light-emitting unit, and the light filter of the fourth light-emitting unit are different from each other.
9. The organic light-emitting structure according to claim 8 , wherein the light filter of the first light-emitting unit is a first light filter, the light filter of the second light-emitting unit is a second light filter, the light filter of the third light-emitting unit is a third light filter, the light filter of the fourth light-emitting unit is a fourth light filter, each of a transmittance of the second light filter and a transmittance of the third light filter is greater than each of a transmittance of the first light filter and a transmittance of the fourth light filter.
10. The organic light-emitting structure according to claim 1 , wherein the light-emitting layer of the first light-emitting unit is a first light-emitting layer; the light-emitting layer of the second light-emitting unit is a second light-emitting layer; the light-emitting layer of the third light-emitting unit is a third light-emitting layer; the light-emitting layer of the fourth light-emitting unit is a fourth light-emitting layer; and
a thickness of the first light-emitting layer is independently in a range of 18 nm-22 nm; a thickness of the second light-emitting layer is independently in a range of 31.5 nm-38.5 nm; a thickness of the third light-emitting layer is independently in a range of 31.5 nm-38.5 nm; and a thickness of the fourth light-emitting layer is independently in a range of 36 nm-44 nm.
11. A display device, comprising an organic light-emitting structure, wherein the organic light-emitting structure comprises:
a first light-emitting unit,
a second light-emitting unit,
a third light-emitting unit, and
a fourth light-emitting unit,
wherein each of the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and the fourth light-emitting unit comprises a first electrode, a second electrode, and an organic laminated body placed between the first electrode and the second electrode, and one of the first electrode and the second electrode is a translucent electrode;
an emission wavelength of the first light-emitting unit, an emission wavelength of the second light-emitting unit, an emission wavelength of the third light-emitting unit, and an emission wavelength of the fourth light-emitting unit successively increase; and
each of a luminous efficiency of the second light-emitting unit and a luminous efficiency of the third light-emitting unit is greater than each of a luminous efficiency of the first light-emitting unit and a luminous efficiency of the fourth light-emitting unit,
wherein the organic laminated body comprises a common hole injection layer, a common hole transmission layer, a monochromic hole transmission layer, a light-emitting layer, and a common electron transmission layer; the common hole injection layer, the common hole transmission layer, the monochromic hole transmission layer, the light-emitting layer, and the common electron transmission layer are successively stacked; and the common hole injection layer is closer to the first electrode than the common electron transmission layer;
wherein the monochromic hole transmission layer of the first light-emitting unit is a first monochromic hole transmission layer; the monochromic hole transmission layer of the second light-emitting unit is a second monochromic hole transmission layer; the monochromic hole transmission layer of the third light-emitting unit is a third monochromic hole transmission layer; the monochromic hole transmission layer of the fourth light-emitting unit is a fourth monochromic hole transmission layer; and
wherein a thickness of the first monochromic hole transmission layer, a thickness of the second monochromic hole transmission layer, a thickness of the third monochromic hole transmission layer, and a thickness of the fourth monochromic hole transmission layer successively increase.