Organic light-emitting diode display device including a plurality of stacks
An organic light-emitting diode display device includes a first electrode, a first stack emitting blue light, a first charge generation layer on the first stack; a second stack emitting yellow-green light, a second charge generation layer on the second stack, a third stack emitting blue light, and a second electrode on the third stack, wherein at least one of the first stack and the third stack further emits red light, wherein the at least one of the first stack and the third stack includes a first red emitting material layer and a blue emitting material layer, and wherein each of the first red emitting material layer and the blue emitting material layer includes a host and a dopant, and a T 1 energy of the host of the blue emitting material layer is greater than a T 1 energy of the dopant of the first red emitting material layer.
1 . An organic light-emitting diode display device comprising:
a first electrode;
a first stack on the first electrode, including a first light emitting material layer, and emitting at least blue light;
a first charge generation layer on the first stack;
a second stack on the first charge generation layer, including a second light emitting material layer, and emitting at least yellow-green light;
a second charge generation layer on the second stack;
a third stack on the second charge generation layer, including a third light emitting material layer, and emitting at least blue light; and
a second electrode on the third stack,
wherein the third light emitting material layer of and the third stack further emits red light,
wherein the third light emitting material layer of the third stack includes a first red emitting material layer and a first blue emitting material layer, and
wherein each of the first red emitting material layer and the first blue emitting material layer includes a host and a dopant, and a triplet excited state T 1 energy of the host of the first blue emitting material layer is greater than a T 1 energy of the dopant of the first red emitting material layer,
wherein both the dopant of the first red emitting material layer and the dopant of the first blue emitting material layer are phosphorescent dopants,
wherein the first blue emitting material layer including the phosphorescent dopant is positioned between the second electrode and the first red emitting material layer including the phosphorescent dopant, and
wherein number of layers between the second charge generation layer and the third light emitting material layer is greater than number of layers between the first charge generation layer and the second light emitting material layer and smaller than number of layers between the first electrode and the first light emitting material.
2 . The organic light-emitting diode display device of claim 1 ,
wherein the first stack includes a hole injecting layer, a first hole transporting layer, and a second hole transporting layer between the first electrode and the first light emitting material layer,
wherein the second stack includes a third hole transporting layer between the first charge generation layer and the second light emitting material layer, and
wherein the third stack includes a fourth hole transporting layer and a fifth hole transporting layer between the second charge generation layer and the third light emitting material layer.
3 . The organic light-emitting diode display device of claim 1 , wherein a difference between the T 1 energy of the host of the first blue emitting material layer and the T 1 energy of the dopant of the first red emitting material layer is 0.2 eV to 1.2 eV.
4 . The organic light-emitting diode display device of claim 1 , wherein the host of the first red emitting material layer includes a hole-type (H-type) host and an electron-type (E-type) host, and a ratio of the H-type host is equal to or greater than a ratio of the E-type host in the first red emitting material layer.
5 . The organic light-emitting diode display device of claim 4 , wherein the ratio of the H-type host in the first red emitting material layer is 50 to 80 Vol %.
6 . The organic light-emitting diode display device of claim 1 , wherein a thickness of the first red emitting material layer is 50 Å to 100 Å.
7 . The organic light-emitting diode display device of claim 1 , wherein the first blue emitting material layer is disposed above the first red emitting material layer.
8 . The organic light-emitting diode display device of claim 1 , wherein the second stack further emits red light, and
wherein the second light emitting material layer of the second stack includes a second red emitting material layer.
9 . The organic light-emitting diode display device of claim 1 , wherein the first light emitting material layer of the first stack includes a second red emitting material layer and a second blue emitting material layer.
10 . The organic light-emitting diode display device of claim 9 , wherein the second stack further emits red light, and
wherein the second light emitting material layer of the second stack includes a third red emitting material layer.
11 . The organic light-emitting diode display device of claim 1 ,
wherein the second light emitting material layer of the second stack includes a first yellow-green emitting material layer and a second yellow-green emitting material layer,
wherein the first yellow-green emitting material layer is disposed between the first charge generation layer and the second yellow-green emitting material layer, and wherein a content of a dopant of the first yellow-green emitting material layer is greater than a content of a dopant of the second yellow-green emitting material layer.
12 . The organic light-emitting diode display device of claim 11 , wherein the second light emitting material layer of the second stack further includes a second red emitting material layer, and a dopant of the second red emitting material layer, the dopant of the first yellow-green emitting material layer, and the dopant of the second yellow-green emitting material layer are phosphorescent dopants.
13 . The organic light-emitting diode display device of claim 1 ,
wherein the second stack further emits green light, wherein the second light emitting material layer of the second stack includes a yellow-green emitting material layer and a green emitting material layer, and
wherein the yellow-green emitting material layer is disposed between the first charge generation layer and the green emitting material layer.
14 . The organic light-emitting diode display device of claim 1 , further comprising a color filter layer or a color conversion layer disposed on the second electrode or disposed under the first electrode.
15 . The organic light-emitting diode display device of claim 1 , wherein a distance between the first electrode to the second electrode is from 4,000 Å to 4,500 Å.
16 . The organic light-emitting diode display device of claim 1 ,
wherein the first light emitting material layer of the first stack further includes a second red emitting material layer and a second blue emitting material layer, and
wherein each of the second red emitting material layer and the second blue emitting material layer includes a host and a dopant, and both the dopant of the second red emitting material layer and the dopant of the second blue emitting material layer are phosphorescent dopants.
17 . The organic light-emitting diode display device of claim 1 , wherein the first light emitting material layer of the first stack includes a second red emitting material layer including a phosphorescent dopant and a second blue emitting material layer including a phosphorescent dopant, and
wherein the second red emitting material layer including the phosphorescent dopant is positioned between the first electrode and the second blue emitting material layer including the phosphorescent dopant.
18 . The organic light-emitting diode display device of claim 17 , wherein the second stack further emits red light,
wherein the second light emitting material layer of the second stack includes a third red emitting material layer including a phosphorescent dopant, and
wherein the first red emitting material layer including the phosphorescent dopant is positioned between the first blue emitting material layer including the phosphorescent dopant and the third red emitting material layer including the phosphorescent dopant.
19 . The organic light-emitting diode display device of claim 18 ,
wherein the second blue emitting material layer including the phosphorescent dopant is positioned between the second red emitting material layer including the phosphorescent dopant and the third red emitting material layer including the phosphorescent dopant.