ORGANIC LIGHT-EMITTING DEVICE

• US 20090218934A1
• Filed: 09/05/2008
• Published: 09/03/2009
• Est. Priority Date: 03/03/2008
• Status: Abandoned Application

• Current Assignee: Samsung Mobile Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung SDI Company Limited
• Inventors: Song, Won-Jun, Park, Soo-Jin
• Application Number:
  US12/205,119
• Publication Number:
  US 20090218934A1
• Time in Patent Office: Days
• US Class Current: 313/504
• CPC Class Codes: H10K 2102/103 comprising indium oxides, e.g. ITO
• CPC Class Codes: H10K 2102/351 Thickness
• CPC Class Codes: H10K 50/14 Carrier transporting layers
• CPC Class Codes: H10K 50/17 Carrier injection layers
• CPC Class Codes: H10K 71/164 using vacuum deposition
• CPC Class Codes: H10K 71/30 Doping active layers, e.g. electron transporting layers
• CPC Class Codes: H10K 85/324 comprising aluminium, e.g. Alq3

Abstract

An organic light-emitting device comprising: a first electrode; a second electrode; an emissive layer; a first hole injecting layer disposed between the first electrode and the emissive layer; a second hole injecting layer disposed between the first electrode and the emissive layer; and an electron transporting layer disposed between the emissive layer and the second electrode, wherein the first hole injecting layer comprises a metal fluoride, the second hole injecting layer comprises molybdenum oxide, and the electron transporting layer comprises a metal compound represented by Formula 1 below:

X_aY_b   <Formula 1>

X is one of an alkaline metal, an alkaline earth metal, and a transition metal,

Y is one of a Group 7 element and a C₁-C₂₀ organic group,

• • a is 1 to 3, and
  • b is 1 to 3.

Claims

1. An organic light-emitting device, comprising:

a first electrode;

a second electrode;

an emissive layer disposed between the first electrode and the second electrode;

a first hole injecting layer disposed between the first electrode and the emissive layer, the first hole injecting layer comprising a metal fluoride and a first hole injecting material;

a second hole injecting layer disposed between the first electrode and the emissive layer, the second hole injecting layer comprising molybdenum oxide and a second hole injecting material; and

an electron transporting layer disposed between the emissive layer and the second electrode, the electron transporting layer comprising an electron transporting material and a metal compound represented by Formula 1 below;

X_aY<sub>b tm <

Formula</sub> 1>

in which X is one selected from the group consisting of an alkaline metal, an alkaline earth metal, and a transition metal, Y is one selected from the group consisting of a Group 7 element and a C₁-C₂₀ organic group, a is 1 to 3, and b is 1 to 3.

2. The organic light-emitting device of claim 1, wherein a mixing ratio of the metal fluoride and the first hole injecting material is 1:

1 to 3;

1.

3. The organic light-emitting device of claim 1, wherein a mixing ratio of the molybdenum oxide and the second hole injecting material is 1:

1 to 3;

1.

4. The organic light-emitting device of claim 1, wherein a metal of the metal fluoride is a Group 1 element or a Group 2 element.

5. The organic light-emitting device of claim 1, wherein the first hole injecting material and the second hole injecting material are each independently selected from the group consisting of copper phthalocyanine, 1,3,5-tricarbazolylbenzene, 4,4′

-biscarbazolylbiphenyl, polyvinylcarbazole, m-biscarbazolylphenyl, 4,4′

-biscarbazolyl-2,2′

-dimethylbiphenyl, 4,4′

,4″

-tri(N-carbazolyl)triphenylamine (TCTA), 4,4′

,4″

-tris(3-methylphenylamino)triphenylamine (m-MTDATA), 1,3,5-tri(2-carbazolylphenyl)benzene, 1,3,5-tris(2-carbazolyl-5-methoxyphenyl)benzene, bis(4-carbazolylphenyl)silane, N,N′

-bis(3-methylphenyl)-N,N′

-diphenyl-[1,1-biphenyl]-4,4′

-diamine (TPD), N,N′

-di(naphthalen-1-yl)-N,N′

-diphenyl benzidine (α

-NPD), N,N′

-diphenyl-N,N′

-bis(1-naphthyl)-(1,1′

-biphenyl)-4,4′

-diamine (NPB), poly(9,9-dioctylfluorene-co-N-(4-butylphenyl)diphenylamine) (TFB) and poly(9,9-dioctylfluorene-co-bis-N,N-phenyl-1,4-phenylenediamine) (PFB).

6. The organic light-emitting device of claim 5, wherein a thickness ratio of the first hole injecting layer and the second hole injecting layer is 1:

9 to 9;

1.

7. The organic light-emitting device of claim 1, wherein X of Formula 1 is one of Li, Cs, Na, Ba, and Mg.

8. The organic light-emitting device of claim 1, wherein Y is one of F, quinolate, and acetoacetate.

9. The organic light-emitting device of claim 1, wherein the metal compound represented by Formula 1 is at least one selected from the group consisting of lithium quinolate, sodium quinolate, lithium acetoacetate, magnesium acetoacetate, lithium fluoride, cesium fluoride, and sodium fluoride.

10. The organic light-emitting device of claim 1, wherein the amount of the metal compound represented by Formula 1 in the electron transporting layer is 30 to 60 parts by weight based on 100 parts by weight of the electron transporting material.

11. The organic light-emitting device of claim 1, wherein electron mobility of the electron transporting material is 10⁻

8 cm/V or greater at an electric field of 800 to 1000 (V/cm)^1/2.

12. The organic light-emitting device of claim 1, wherein the electron transporting material is at least one selected from the group consisting of bis(10-hydroxebenzo[h]quinolinatoberyllium) represented by Formula 2 below, and derivatives thereof:

13. The organic light-emitting device of claim 1, wherein the electron transporting layer comprises:

a first electron transporting layer comprising the metal compound represented by Formula 1 and a first electron transporting material, the first electron transporting material being the same as the electron transporting material; and

a second electron transporting layer disposed between the first electron transport layer and the second electrode, the second electron transporting layer comprising a second electron transporting material.

14. The organic light-emitting device of claim 13, wherein electron mobility of the second electron transporting material is 10⁻

8 cm/V or greater at an electric field of 800 to 1000 (V/cm)^1/2.

15. The organic light-emitting device of claim 13, wherein the electron mobility of the second electron transporting material is 10⁻

8 to 10<sup>−

3</sup> cm/V at an electric field of 800 to 1000 (V/cm)^1/2.

16. The organic light-emitting device of claim 13, wherein a thickness ratio of the first electron transporting layer and the second electron transporting layer is 2:

1 to 1;

2.

17. The organic light-emitting device of claim 13, wherein the content of the metal compound represented by Formula 1 in the first electron transporting layer is 30 to 60 parts by weight based on 100 parts by weight of the first electron transporting material.

18. The organic light-emitting device of claim 1, further comprising at least one layer selected from the group consisting of a hole injecting layer, a hole transporting layer, an electron blocking layer, an emissive layer, a hole blocking layer, and an electron transporting layer.

19. The organic light-emitting device of claim 1, wherein the device has one structure selected from the group consisting of first electrode/hole transporting layer/emissive layer/electron transporting layer/second electrode, first electrode/first hole injecting layer/second hole injecting layer/hole transporting layer/emissive layer/electron transporting layer/second electrode, and first electrode/hole injecting layer/hole transporting layer/emissive layer/hole blocking layer/electron transporting layer /second electrode.

20. An organic light-emitting device, comprising:

a first electrode;

a second electrode;

an emissive layer disposed between the first and second electrodes;

a first hole injecting layer disposed between the first electrode and the emissive layer, the first hole injecting layer comprising a first metal fluoride and a first hole injecting material; and

a second hole injecting layer disposed between the first hole injecting layer and the first electrode, the second hole injecting layer comprising a second metal fluoride and a second hole injecting material.

21. The organic light-emitting device of claim 20, wherein metals of the first metal fluoride and the second metal fluoride are independently selected from the group consisting of Group 1 and Group 2 elements.

22. The organic light-emitting device of claim 20, wherein the first metal fluoride and the second metal fluoride are independently selected from the group consisting of LiF, NaF, MgF₂, F₁₆—

CuPc, F₈—

CuPc, F₄-TCNQ, and CsF.

23. The organic light-emitting device of claim 20, further comprising:

a first electron transporting layer disposed between the second electrode and the emissive layer, the first electron transporting layer comprising a metal compound represented by Formula 1 below and a first electron transporting material; and

a second electron transporting layer disposed between the first electron transport layer and the second electrode, the second electron transporting layer comprising a metal compound represented by Formula 1 below and a second electron transporting material,

X_aY_b  

 

<

Formula 1>

in which X is one selected from the group consisting of an alkaline metal, an alkaline earth metal, and a transition metal, Y is one selected from the group consisting of a Group 7 element and a C₁-C₂₀ organic group, a is 1 to 3, and b is 1 to 3.

24. The organic light-emitting device of claim 23, wherein the first electron transporting material is BeBq2 and the second electron transporting material is Alq3.

25. An organic light-emitting device, comprising:

a first electrode;

a second electrode;

an emissive layer disposed between the first and second electrodes;

a first electron transporting layer disposed between the second electrode and the emissive layer, the first electron transporting layer comprising a metal compound represented by Formula 1 below and a first electron transporting material; and

a second electron transporting layer disposed between the first electron transport layer and the second electrode, the second electron transporting layer comprising a metal compound represented by Formula 1 below and a second electron transporting material,

X_aY_b  

 

<

Formula 1>

in which X is one selected from the group consisting of an alkaline metal, an alkaline earth metal, and a transition metal, Y is one selected from the group consisting of a Group 7 element and a C₁-C₂₀ organic group, a is 1 to 3, and b is 1 to 3.

26. The organic light-emitting device of claim 25, wherein the first electron transporting material is BeBq2 and the second electron transporting material is Alq3.

27. An organic light-emitting device, comprising:

a first electrode;

a second electrode;

an emissive layer disposed between the first and second electrodes;

a first hole injecting layer disposed between the first electrode and the emissive layer, the first hole injecting layer comprising a first metal fluoride and a first hole injecting material;

a second hole injecting layer disposed between the first hole injecting layer and the first electrode, the second hole injecting layer comprising a second metal fluoride and a second hole injecting material; and

an electron transporting layer disposed between the emissive layer and the second electrode, the electron transporting layer comprising a metal compound represented by Formula 1 below and an electron transporting material,

X_aY_b  

 

<

Formula 1>

in which X is one selected from the group consisting of an alkaline metal, an alkaline earth metal, and a transition metal, Y is one selected from the group consisting of a Group 7 element and a C₁-C₂₀ organic group, a is 1 to 3, and b is 1 to 3,

wherein the organic light-emitting device does not include an electron injection layer disposed between the electron transporting layer and the second electrode.