ORGANIC LIGHT EMITTING DIODE DISPLAY DEVICE AND METHOD OF FABRICATING THE SAME
Provided are an organic light emitting diode display device including an emission layer structure between a first electrode and a second electrode, in which a first emission layer and a second emission layer are stacked, wherein the first emission layer emits one of red, green and blue light, and the second emission layer comprises a host and dopants of two different colors other than the color of the light emitted from the first emission layer among the red, green, and blue light, capable of reducing a driving voltage and obtaining high emission intensity at each wavelength of red, green, and blue light to thereby efficiently implement full color.
1 . An organic light emitting diode display device, comprising:
a substrate;
a first electrode disposed over the substrate;
a second electrode disposed over the first electrode; and
an emission layer structure disposed between the first electrode and the second electrode, wherein,
the emission layer structure comprises a stack of a first emission layer and a second emission layer,
the first emission layer emits one of red, green and blue light, and
the second emission layer comprises a host and dopants for the other two of red, green, and blue light.
2 . The device of claim 1 , wherein the host of the second emission layer comprises a single material.
3 . The device of claim 1 , wherein the dopants of the second emission layer comprise fluorescent dopants.
4 . The device of claim 1 , wherein the dopants of the second emission layer comprise phosphorescent dopants.
5 . The device of claim 1 , wherein the first emission layer comprises a host and a dopant.
6 . The device of claim 1 , wherein the first emission layer is a blue emission layer.
7 . The device of claim 1 , wherein the second emission layer comprises a green dopant and a red dopant.
8 . The device of claim 1 , wherein the first electrode is an anode, the first emission layer is disposed on the anode, and the second emission layer is disposed on the first emission layer.
9 . The device of claim 8 , wherein the first emission layer is a blue emission layer, and the second emission layer comprises a green dopant and a red dopant.
10 . The device of claim 7 , wherein the second emission layer comprises a host selected from the group consisting of CBP, Balq, BCP, and DCB.
11 . The device of claim 7 , wherein a concentration of the green dopant is higher than a concentration of the red dopant.
12 . The device of claim 7 , wherein the green dopant has a concentration of from about 5 wt % to about 10 wt %, and the red dopant has a concentration of from about 0.1 wt % to about 3 wt %.
13 . The device of claim 1 , further comprising at least one of a color filter disposed below the first electrode and a color filter disposed above the second electrode.
14 . The device of claim 1 , wherein at least one of the first electrode and the second electrode comprises a transparent electrode material.
15 . The device of claim 14 , wherein the transparent electrode material is stacked on a reflective layer.
16 . A method for fabricating an organic light emitting diode display device, comprising:
providing a substrate;
forming a first electrode on the substrate;
forming an emission layer structure over the first substrate, wherein forming the emission layer structure comprises:
forming a first emission layer emitting one of red, green, and blue light, and
forming a second emission layer comprising a host and dopants of the other two of red, green, and blue light; and
forming a second electrode over the emission layer structure.
17 . The method of claim 16 , wherein forming the first emission layer comprises co-depositing a host and a dopant for one of red, green, and blue light.
18 . The method of claim 16 , wherein forming the second emission layer comprises co-depositing the host and the dopants of the other two of red, green, and blue light.
19 . The method of claim 16 , wherein forming the first emission layer and forming the second emission layer comprises vacuum-depositing the first emission layer and second emission layer.
20 . The method of claim 16 , further comprising at least one of forming a color filter below the first electrode and forming a color filter above the second electrode by laser induced thermal imaging.