ORGANIC LIGHT EMITTING DIODE AND ORGANIC LIGHT EMITTING DEVICE HAVING THE SAME

• US 20200136059A1
• Filed: 07/22/2019
• Published: 04/30/2020
• Est. Priority Date: 10/25/2018
• Status: Active Grant

• Current Assignee: LG Chem Limited (LG Corporation), LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Hong, Tae-Ryang, Choi, Hyong-Jong, Kim, Jun-Yun, Hong, Wan-Pyo, Kim, Jin-Joo, Yoon, Hong-Sik
• Granted Patent: US 11,588,113 B2
• Time in Patent Office: Days
• CPC Class Codes: C07D 405/14 containing three or more hetero rings
• CPC Class Codes: C07D 409/14 containing three or more hetero rings
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: C09K 2211/1018 Heterocyclic compounds
• CPC Class Codes: H10K 2101/10 Triplet emission
• CPC Class Codes: H10K 2101/27 Combination of fluorescent and phosphorescent emission
• CPC Class Codes: H10K 2101/30 Highest occupied molecular orbital [HOMO], lowest unoccupied molecular orbital [LUMO] or Fermi energy values
• CPC Class Codes: H10K 2101/40 Interrelation of parameters between multiple constituent active layers or sublayers, e.g. HOMO values in adjacent layers
• CPC Class Codes: H10K 2102/351 Thickness
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/13 comprising stacked EL layers within one EL unit
• CPC Class Codes: H10K 50/19 Tandem OLEDs
• CPC Class Codes: H10K 85/322 comprising boron
• CPC Class Codes: H10K 85/6572 comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole
• CPC Class Codes: H10K 85/6574 comprising only oxygen in the heteroaromatic polycondensed ring system, e.g. cumarine dyes
• CPC Class Codes: H10K 85/6576 comprising only sulfur in the heteroaromatic polycondensed ring system, e.g. benzothiophene

Abstract

Disclosed is an organic light emitting diode (OLED) includes a first emitting material layer, which includes a first compound and a second compound, and a second emitting material layer, which includes a third compound and a fourth compound, wherein a HOMO energy level of the first compound is higher than a HOMO energy level of the second compound and a HOMO energy level of the third compound is lower than a HOMO energy level of the fourth compound, and an organic light emitting device having the OLED. The OLED and the organic light emitting device disclosed have enhanced luminous efficiency, color purity and luminous life span as well as low driving voltage by applying the emitting material layer.

Claims

1. An organic light emitting diode, comprising:

a first electrode and a second electrode, wherein the first and the second electrodes face each other; and

an emitting material layer disposed between the first and second electrodes,

wherein the emitting material layer includes a first emitting material layer and a second emitting material layer, the first emitting material layer including a first compound and a second compound, and the second emitting material layer including a third compound and a fourth compound,

wherein an excited state singlet energy level of the first compound is higher than an excited state singlet energy level of the second compound,

wherein an excited state singlet energy level and an excited state triplet energy level of the third compound are each higher than an excited state singlet energy level and an excited state triplet energy level of the fourth compound, respectively,

wherein a Highest Occupied Molecular Orbital (HOMO) energy level of the first compound is higher than a HOMO energy level of the second compound, and

wherein a HOMO energy level of the third compound is lower than a HOMO energy level of the fourth compound.

2. The organic light emitting diode of claim 1, wherein a Lowest Unoccupied Molecular Orbital (LUMO) energy level of the third compound is higher than a LUMO energy level of the fourth compound.

3. The organic light emitting diode of claim 1, wherein a HOMO energy level and a Lowest Unoccupied Molecular Orbital (LUMO) energy level of the first compound are each higher than a HOMO energy level and a LUMO energy level of the third compound, respectively.

4. The organic light emitting diode of claim 1, wherein an energy level bandgap between the excited state singlet energy level and the excited state triplet energy level of the fourth compound is equal to or less than about 0.3 eV.

5. The organic light emitting diode of claim 1, further comprising a third emitting material layer disposed between the second emitting material layer and the second electrode and including a fifth compound and a sixth compound.

6. The organic light emitting diode of claim 5, wherein an excited state singlet energy level of the fifth compound is higher than an excited state singlet energy level of the sixth compound.

7. The organic light emitting diode of claim 1, wherein the first compound comprises an organic compound having the following structure of Chemical Formula 1:

8. The organic light emitting diode of claim 1, wherein the third compound comprises an organic compound having the following structure of Chemical Formula 3:

9. The organic light emitting diode of claim 8, wherein the third compound comprises an organic compound having the following structure of Chemical Formula 4 or Chemical Formula 5:

10. The organic light emitting diode of claim 1, wherein the second compound comprises any one of the following structures of Chemical Formula 7 or Chemical Formula 8:

11. The organic light emitting diode of claim 1, wherein the fourth compound comprises any one of the following structures of Chemical Formula 9:

23. An organic light emitting device, comprising:

a substrate; and

the organic light emitting diode according to claim 1 disposed over the substrate.

24. The organic light emitting device of claim 23, wherein the organic light emitting device comprises an organic light emitting display device.

12. An organic light emitting diode, comprising:

a first electrode and a second electrode, wherein the first electrode and the second electrode face each other; and

an emitting material layer disposed between the first and second electrodes,

wherein the emitting material layer includes a first emitting material layer and a second emitting material layer, the first emitting material layer including a first compound and a second compound, and the second emitting material layer including a third compound and a fourth compound,

wherein an excited state singlet energy level of the first compound is higher than an excited state singlet energy level of the second compound,

wherein an excited state singlet energy level and an excited state triplet energy level of the third compound are each higher than an excited state singlet energy level and an excited state triplet energy level of the fourth compound, respectively,

wherein a Highest Occupied Molecular Orbital (HOMO) energy level of the first compound is higher than a HOMO energy level of the second compound, and

wherein the third compound includes an organic compound having the following structure of Chemical Formula 3;

13. The organic light emitting diode of claim 12, wherein a Lowest Unoccupied Molecular Orbital (LUMO) energy level of the third compound is higher than a LUMO energy level of the fourth compound.

14. The organic light emitting diode of claim 13, wherein a HOMO energy level of the third compound is lower than a HOMO energy level of the fourth compound.

15. The organic light emitting diode of claim 12, wherein a HOMO energy level and a Lowest Unoccupied Molecular Orbital (LUMO) energy level of the first compound are each higher than a HOMO energy level and a LUMO energy level of the third compound, respectively.

16. The organic light emitting diode of claim 12, wherein an energy level bandgap between the excited state singlet energy level and the excited state triplet energy level of the fourth compound is equal to or less than about 0.3 eV.

17. The organic light emitting diode of claim 12, further comprise a third emitting material layer disposed between the second emitting material layer and the second electrode, wherein the third emitting material layer comprises a fifth compound and a sixth compound.

18. The organic light emitting diode of claim 17, wherein an excited state singlet energy level of the fifth compound is higher than an excited state singlet energy level of the sixth compound.

19. The organic light emitting diode of claim 12, wherein the first compound includes an organic compound having the following structure of Chemical Formula 1:

20. The organic light emitting diode of claim 12, wherein the third compound comprises an organic compound having the flowing structure of Chemical Formula 4 or Chemical Formula 5:

21. The organic light emitting diode of claim 12, wherein the second compound comprises any one of the following structures of Chemical Formula 7 or Chemical Formula 8:

22. The organic light emitting diode of claim 12, wherein the fourth compound comprises any one of the following structures of Chemical Formula 9:

25. An organic light emitting device, comprising:

a substrate; and

the organic light emitting diode according to claim 12 disposed over the substrate.

26. The organic light emitting device of claim 25, wherein the organic light emitting device comprises an organic light emitting display device.