Organic electroluminescent device

• US 20030118866A1
• Filed: 09/26/2002
• Published: 06/26/2003
• Est. Priority Date: 10/30/2001
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Sung Koo, Kim, Myung Seop, Park, Chun Gun, Seo, Jeong Dae, Oh, Hyoung Yun
• Granted Patent: US 7,507,485 B2
• Time in Patent Office: Days
• US Class Current: 428/690
• CPC Class Codes: C09B 1/00 Dyes with anthracene nucleus not condensed with any other ring
• CPC Class Codes: C09B 15/00 Acridine dyes
• CPC Class Codes: C09B 23/148 Stilbene dyes containing the moiety -C6H5-CH=CH-C6H5 stilbene azo dyes C09B29/00
• CPC Class Codes: C09B 3/14 Perylene derivatives
• CPC Class Codes: C09B 57/001 Pyrene dyes
• CPC Class Codes: C09B 57/007 Squaraine dyes
• CPC Class Codes: C09B 69/008 Dyes containing a substituent, which contains a silicium atom
• CPC Class Codes: H10K 2101/90 Multiple hosts in the emissive layer
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 85/311 Phthalocyanine
• CPC Class Codes: H10K 85/324 comprising aluminium, e.g. Alq3
• CPC Class Codes: H10K 85/40 Organosilicon compounds, e.g. TIPS pentacene
• CPC Class Codes: H10K 85/623 containing five rings, e.g. pentacene
• CPC Class Codes: H10K 85/626 containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene
• CPC Class Codes: H10K 85/633 comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom
• CPC Class Codes: H10K 85/636 comprising heteroaromatic hydrocarbons as substituents on the nitrogen atom
• CPC Class Codes: H10K 85/653 comprising only oxygen as heteroatom
• CPC Class Codes: H10K 85/657 Polycyclic condensed heteroaromatic hydrocarbons
• CPC Class Codes: Y10S 428/917 Electroluminescent

Abstract

Disclosed is an organic electroluminescent device including a first electrode, a second electrode, and a light-emitting layer having a guest material of a red luminescent material and at least two host materials so as to be formed between the first and second electrodes. One of the host materials is a composite including the following structural formula:

Moreover, one of the host materials can be a substituted or non-substituted quinoline derivative.

Claims

1. An organic electroluminescent device comprising:

a first electrode;

a second electrode; and

a light-emitting layer having a guest material of a red luminescent material and at least two host materials so as to be formed between the first and second electrodes.

2. The organic electroluminescent device of claim 1, wherein a composition of the light-emitting layer includes 0.01˜

30 wt/% of the guest material and 0.05˜

99.9 wt/% of the host materials.

3. The organic electroluminescent device of claim 1, wherein the guest material is selected from the group consisting of a DCM derivative, a Nile red derivative, a Coumarine derivative, a Phodamine derivative, a pyrromethene derivative, and a benzothioxanphene derivative.

4. The organic electroluminescent device of claim 1, wherein one of the host materials is a composite including the following structural formula:

5. The organic electroluminescent device of claim 1, wherein one of the host materials is a substituted or non-substituted quinoline derivative.

6. An organic electroluminescent device comprising:

a first electrode;

a second electrode;

a light-emitting layer having a guest material of a red luminescent material and at least two host materials so as to be formed between the first and second electrodes; and

a hole injection/transport layer formed between the first electrode and light-emitting layer.

7. The organic electroluminescent device of claim 6, wherein an electron injection/transport layer is formed between the second electrode and light-emitting layer.

8. The organic electroluminescent device of claim 6, wherein the light-emitting layer has a composition of 0.01˜

30 wt/% of the guest, 0.05˜

99.9 wt/% of the first host, and 0.05˜

99.9 wt/% of the second host.

9. The organic electroluminescent device of claim 6, wherein the first host is a compound having the following structural formula:

10. The organic electroluminescent device of claim 9, wherein the element of the groups IIIB, IVB, VB, and VIB is selected from the group consisting of B, C, Si, N, O, S, and Se.

11. The organic electroluminescent device of claim 9, wherein each of the aliphatic hydrocarbon groups connecting the A₁/A₂/A₃/N, A₂/Q, and A₃/Q, respectively has 1 to 12 carbon atoms.

12. The organic electroluminescent device of claim 11, wherein the aliphatic hydrocarbon group is selected from the group consisting of methylene, ethylene, trimethylene, cyclohexanediyl, adamanthanediyl, and vinylene groups.

13. The organic electroluminescent device of claim 9, wherein a substituent of the A₁, A₂, A₃, or Q is selected from the group consisting of aryloxy, arylcarbonyl, aryloxycarbonyl, arylcarboxy, aralkyl, arylaminocarbonyl, arylcarbonylamino, arylsilyl, alkyl, alkoxy, alkoxycarbonyl, acyl, acyloxy, acylamino, alkylamino, alkylaminocarbonyl, alkylsulfanyl, alkylsilyl, carbamoyl, hydroxy, amino, cyano, nitro, and thiol groups and halogen atoms.

14. The organic electroluminescent device of claim 13, wherein the substituent is selected from the group consisting of phenoxy, naphthyloxy, phenylcarbonyl, naphthyloxycarbonyl, phenylcarboxy, benzyl, styryl, vinyl, anilinocarbonyl, benzoylamino, tri-phenylsilyl, methyl, ethyl, propyl, 1-propyl, t-butyl, cyclohexyl, methoxy, ethoxy, propoxy, butoxy, methoxycarbonyl, ethoxycarbonyl, formyl, propionyl, acetyloxy, propionylamino, dimethylamino, di-I-propylamino, ethylsulfanyl, and trimethylsilyl groups, F, and Cl.

15. The organic electroluminescent device of claim 9, wherein each of the A₁, A₂, A₃, and Q has at least two of the substituents and wherein at least two of the substituents are boned to each other so as to form a saturated or unsaturated ring.

16. The organic electroluminescent device of claim 9, wherein the aliphatic hydrocarbon group of the A₁ or Q is selected from the group consisting of methylene, ethylene, cyclohexanediyl, and adamanthanediyl groups and wherein an aromatic hydrocarbon or heterocyclic group of each of the A₁, A₂, A₃, and Q is selected from the group consisting of compounds having the following structural formulas:

17. The organic electroluminescent device of claim 9, wherein each of the L1, L2, L3, and L4 is independently selected from the group consisting of compounds having the following structural formulas:

18. The organic electroluminescent device of claim 9, wherein each substituent of the L1, L2, L3, and L4 is selected from the group consisting of aryloxy, arylamino, alkoxy, alkyl, alkylamino, hydroxy, amino, carbonyl, amide, and carboxy groups and halogen atoms.

19. The organic electroluminescent device of claim 18, wherein the substituent is selected from the group consisting of phenoxy, tolyloxy, vinyl, aldehyde, methyl, ethyl, propyl, i-propyl, t-butyl, cyclohexyl, diphenylamino, methoxy, ethoxy, propoxy, butoxy, dimethylamino, and carboxylic acid groups, F, and Cl.

20. The organic electroluminescent device of claim 6, wherein the first host is selected from the group consisting of the following structural compounds:

21. The organic electroluminescent device of claim 6, wherein second host is a substituted or non-substituted quinoline derivative.

22. The organic electroluminescent device of claim 21, wherein the second host is 8-hydroxyquinoline metal complex including the metal selected from the group consisting of Al, Zn, Mg, and Li.

23. The organic electroluminescent device of claim 22, wherein the second host is tris(8-quinolinolate)aluminum.

24. The organic electroluminescent device of claim 6, wherein a maximum PL luminescence peak of the guest is equal to or greater than 550 nm.

25. The organic electroluminescent device of claim 24, wherein the guest is selected from the group consisting of DCM, Nile red, Coumarine, Rhodamine, pyrromethene, and benzothioxanphene derivatives.

26. The organic electroluminescent device of claim 25, wherein the DCM derivative has the following structural formula:

27. The organic electroluminescent device of claim 6, wherein the first and second host materials have maximum PL luminescent peaks of 500-600 nm, respectively.