Organic light emitting diode and organic light emitting display device including the same
An organic light emitting diode and an organic light emitting display device, the organic light emitting diode including a first electrode and a second electrode facing each other; an emission layer between the first electrode and the second electrode; and a hole transport layer between the first electrode and the emission layer, wherein the hole transport layer includes an organic material and a dipole material, the dipole material including a first component and a second component, the first component having a polarity different from that of the second component and the first component and the second component being combined with each other.
1. An organic light emitting diode, comprising:
a first electrode and a second electrode facing each other;
an emission layer between the first electrode and the second electrode; and
a hole transport layer between the first electrode and the emission layer,
wherein the hole transport layer includes an organic material and a dipole material, the dipole material including a first component and a second component, the first component having a polarity different from that of the second component and the first component and the second component being combined with each other.
2. The organic light emitting diode as claimed in claim 1 , wherein:
the first component includes a metal or a non-metal and has a work function of 4.0 eV or more, and
the second component includes a halogen.
3. The organic light emitting diode as claimed in claim 2 , wherein the first component includes an element selected from Ag, Au, B, Be, C, Co, Cr, Cu, Fe, Hg, Ir, Mo, Nb, Ni, Os, Pd, Pt, Re, Rh, Ru, Sb, Se, Si, Sn, Ta, Te, Ti, V, W, In, and Zn.
4. The organic light emitting diode as claimed in claim 3 , wherein the second component includes an element selected from F, Cl, Br, and I.
5. The organic light emitting diode as claimed in claim 4 , wherein the dipole material includes one selected from NiI 2 , CoI 2 , CuI, AgI, SnI 2 , and InI 3 .
6. The organic light emitting diode as claimed in claim 2 , further comprising an electron injection layer between the emission layer and the second electrode,
wherein the electron injection layer:
has a work function of 3.0 eV or less, and
includes at least one selected from an alkali metal, an alkaline earth metal, a rare earth element, a transition metal, or an alloy thereof.
7. The organic light emitting diode as claimed in claim 6 , wherein the electron injection layer includes at least one selected from Li, Na, K, Rb, Cs, Ca, Sr, Ba, Ce, Sm, Eu, Gd, Yb, and an alloy thereof.
8. The organic light emitting diode as claimed in claim 1 , wherein a dipole moment of the first component and the second component is 5 Debye or greater.
9. The organic light emitting diode as claimed in claim 8 , wherein:
the first component includes at least one selected from an alkali metal, an alkaline earth metals, a rare earth element, a transition metal, and an alloy thereof, and
the second component includes a halogen.
10. The organic light emitting diode as claimed in claim 9 , wherein the first component:
has a work function of 3.0 eV or less, and
includes at least one selected from Li, Na, K, Rb, Cs, Ca, Sr, Ba, Ce, Sm, Eu, Gd, and Yb, and an alloy thereof.
11. The organic light emitting diode as claimed in claim 1 , further comprising a hole injection layer between the first electrode and the hole transport layer, wherein the hole injection layer includes an organic material and another dipole material, the other dipole material including a third component and a fourth component, the third component having a polarity different from that of the fourth component, and the third component and the fourth component being combined with each other.
12. The organic light emitting diode as claimed in claim 11 , wherein:
the third component includes a metal or a non-metal having a work function of 4.0 eV or more, and
the fourth component includes a halogen.
13. The organic light emitting diode as claimed in claim 1 , wherein:
the hole transport layer has a structure formed of a plurality of layers and when the organic material and the dipole material each are a first material and a second material,
the plurality of layers each comprise at least one of the first material and the second material.
14. The organic light emitting diode as claimed in claim 1 , wherein the hole transport layer is formed by a co-depositing the organic material and the dipole material.
15. An organic light emitting display device, comprising:
a substrate,
a gate line on the substrate;
a data line and a driving voltage line intersecting the gate line;
a switching thin film transistor connected to the gate line and the data line;
a driving thin film transistor connected to the switching thin film transistor and the driving voltage line; and
an organic light emitting diode connected to the driving thin film transistor,
wherein the organic light emitting diode includes:
a first electrode and a second electrode facing each other;
an emission layer between the first electrode and the second electrode; and
a hole transport layer between the first electrode and the emission layer, and wherein:
the hole transport layer includes an organic material and a dipole material,
the dipole material includes a first component and a second component, and
the first component has a polarity different from that of the second component, the first component and the second component being combined with each other.
16. The organic light emitting display device as claimed in claim 15 , wherein:
the first component includes a metal or a non-metal, the metal or non-metal having a work function of 4.0 eV or more, and
the second component includes halogen.
17. The organic light emitting display device as claimed in claim 16 , wherein the first component includes an element selected from Ag, Au, B, Be, C, Co, Cr, Cu, Fe, Hg, Ir, Mo, Nb, Ni, Os, Pd, Pt, Re, Rh, Ru, Sb, Se, Si, Sn, Ta, Te, Ti, V, W, In, and Zn.
18. The organic light emitting display device as claimed in claim 17 , wherein the second component includes an element selected from F, Cl, Br, and I.
19. The organic light emitting display device as claimed in claim 18 , wherein the dipole material includes one selected from NiI 2 , CoI 2 , CuI, AgI, SnI 2 , and InI 3 .
20. The organic light emitting display device as claimed in claim 15 , wherein a dipole moment of the first component and the second component is 5 Debye or greater.
21. The organic light emitting display device as claimed in claim 20 , wherein:
the first component includes at least one selected from an alkali metal, an alkaline earth metals, a rare earth element, a transition metal, and an alloy thereof, and
the second component includes a halogen.
22. The organic light emitting display device as claimed in claim 21 , wherein the first component:
has a work function of 3.0 eV or less, and
includes at least one selected from Li, Na, K, Rb, Cs, Ca, Sr, Ba, Ce, Sm, Eu, Gd, and Yb, and an alloy thereof.
23. The organic light emitting display device as claimed in claim 15 , wherein:
the emission layer includes a red emission layer, a green emission layer, and a blue emission layer, and
the organic light emitting display device further includes an auxiliary layer on a lower end of the blue emission layer.
24. The organic light emitting display device as claimed in claim 23 , wherein the auxiliary layer includes a compound represented by the following Chemical Formula 1:
wherein, in Chemical Formula 1,
A1, A2, and A3 each independently include an alkyl group, an aryl group, a carbazole group, a dibenzothiophene group, a dibenzofuran group, or a biphenyl group, and
a, b, and c are each independently an integer of 0 to 4.
25. The organic light emitting display device as claimed in claim 23 , wherein the auxiliary layer includes a compound represented by the following Chemical Formula 2:
wherein, in Chemical Formula 2,
a, b, and c are each independently an integer of 0 to 3, and
each X is independently selected from O, N, and S.
26. The organic light emitting display device as claimed in claim 15 , wherein:
the hole transport layer has a structure formed of a plurality of layers and when the organic material and the dipole material each are a first material and a second material, and
the plurality of layers each comprise at least one of the first material and the second material.