Display device with metal-organic mixed layer anodes

• US 7,943,244 B2
• Filed: 05/20/2005
• Issued: 05/17/2011
• Est. Priority Date: 05/20/2005
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Paine, Anthony J., Stefanovic, Nemanja, Popovic, Zoran D., Aziz, Hany, Coggan, Jennifer A.
• Primary Examiner(s): Tarazano; D. Lawrence
• Assistant Examiner(s): Wilson; Michael H
• Application Number:
  US11/133,977
• Publication Number:
  US 20060263628A1
• Time in Patent Office: 2,188 Days
• Field of Search: 428/690, 428/917, 427/58, 427/66, 313502-509, 257/40, 257 88-103, 257E51001-E51052, 25230116-30135
• US Class Current: 428/690
• CPC Class Codes: H10K 50/17 Carrier injection layers
• CPC Class Codes: H10K 50/81 Anodes
• CPC Class Codes: H10K 50/818 Reflective anodes, e.g. ITO combined with thick metallic layers
• CPC Class Codes: H10K 50/865 comprising light absorbing layers, e.g. light-blocking layers
• CPC Class Codes: H10K 85/324 comprising aluminium, e.g. Alq3
• CPC Class Codes: H10K 85/621 Aromatic anhydride or imide compounds, e.g. perylene tetra-carboxylic dianhydride or perylene tetracarboxylic di-imide
• CPC Class Codes: Y10S 428/917 Electroluminescent

Abstract

A display device comprises an anode, a cathode, and a luminescent region disposed between the anode and the cathode, wherein the anode comprises a metal-organic mixed layer operatively combined with an electron-accepting material. An anode may comprise a mixture of a metal-organic mixed layer and an electron-accepting material within a single layer of the anode. Alternatively, the anode may have a multilayer configuration comprising a metal-organic mixed layer and a buffer layer adjacent the metal-organic mixed layer, wherein the buffer layer comprises an electron-accepting material and optionally a hole transport material.

Claims

1. An organic light emitting device comprising;

an anode;

a cathode; and

a luminescent region comprising an organic electroluminescent material disposed between the anode and the cathode,

wherein the anode consists of a metal-organic mixed layer comprising i) a metal material, ii) an organic material, and iii) an electron accepting material,

wherein the electron-accepting material is selected from the group consisting of trinitrofluorenone, 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane and combinations thereof,

wherein the electron-accepting material oxidizes an organic compound used in the luminescent region.

2. The device according to claim 1, further comprising a hole transport material selected from the group consisting of N,Ni-di(naphthalene-1-yl)-N,NI-diphenyl-benzidine (NPB), 4,4′

4″

-tris(N,N-diphenylamino)triphenylamine (mTDATA), 2,5-di-tert-butylphenyl-N,NI-diphenyl-N,N′

bis(3-methylphenyl-(1,1Ibiphenyl)-4,4′

-diamine (BP-TPD), N,N′

-diphenyl-N,N1-bis(3)methylphenyl-(1,1′

-biphenyl)-4,4′

-diamine (TPD), copper phthalocyanine (CuPc), vanadylphthalocyanine (VOPc), poly(3,4-ethylenedioxythiophene (PEDOT), polyaniline (PAni), and combinations thereof.

3. The device according to claim 1, wherein the metal material comprises a metal selected from the group consisting of Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr, Ba, Sc, Y, La, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Tc, Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, B, Al, Ga, In, Sn, Pb, Sb, Bi, Se, Te, Ce, Nd, Sm, Eu, and combinations thereof.

4. The device according to claim 1, wherein the metal-organic mixed layer is present in an amount of from about 5 to about 95 volume percent by volume of the anode, and the electron-accepting material is present in an amount of from about 95 to about 5 percent by volume of the anode.

5. The device according to claim 1, wherein the anode has a thickness in the range of from about 100 to about 5,000 angstroms.

6. The device according to claim 1, wherein the anode is light-absorbing, and the metal-organic mixed layer is selected such that the device reduces light reflection by at least about 30%.

7. The device according to claim 1, wherein the anode is substantially transparent, and the metal-organic mixed layer is selected such that the anode light transmittance in the visible range is at least 50%.

8. The device according to claim 1, wherein the anode is substantially reflective, and the metal-organic mixed layer is selected such that the anode reflectance in the visible range is at least 50%.

9. A display device comprising the device of claim 1.

10. An organic light emitting device comprising;

an anode;

a cathode; and

a luminescent region comprising an organic electroluminescent material disposed between the anode and the cathode,

wherein the anode comprises a metal-organic mixed layer comprising a mixture of i) a metal material, ii) an organic material, iii) an electron-accepting material,

wherein the metal-organic mixed layer is operatively combined with the electron-accepting material, and

wherein the electron-accepting material is selected from the group consisting of FeCl₃, AlCl₃, InCl₃, GaCl₃, SbCl₅, trinitrofluorenone, 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane and combinations thereof.