WHITE OLED DEVICE WITH IMPROVED FUNCTIONS

• US 20080176099A1
• Filed: 01/18/2007
• Published: 07/24/2008
• Est. Priority Date: 01/18/2007
• Status: Abandoned Application

• Current Assignee: Global OLED Technology LLC (LG Display Co., Ltd.)
• Original Assignee: Global OLED Technology LLC (LG Display Co., Ltd.)
• Inventors: Spindler, Jeffrey P., Hatwar, Tukaram K., Begley, William J.
• Application Number:
  US11/624,426
• Publication Number:
  US 20080176099A1
• Time in Patent Office: Days
• US Class Current: 428/690
• CPC Class Codes: H10K 50/13 comprising stacked EL layers within one EL unit
• CPC Class Codes: H10K 50/14 Carrier transporting layers
• CPC Class Codes: H10K 85/30 Coordination compounds
• CPC Class Codes: H10K 85/322 comprising boron
• CPC Class Codes: H10K 85/622 containing four rings, e.g. pyrene
• CPC Class Codes: H10K 85/626 containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene
• CPC Class Codes: H10K 85/6572 comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole

Abstract

A white light-emitting OLED device having a spaced anode and cathode and comprising: a blue light-emitting layer disposed between the anode and cathode; a green light-emitting layer in contact with the blue light-emitting layer; a red light-emitting layer in contact with either the blue light-emitting layer or the green light-emitting layer; and an electron-transporting layer disposed between the light-emitting layers and the cathode, wherein the red light-emitting layer, green light-emitting layer, blue light-emitting layer, and the electron-transporting layer each include an independently selected anthracene compound.

Claims

1. A white light-emitting OLED device having a spaced anode and cathode and comprising:

(a) a blue light-emitting layer disposed between the anode and cathode;

(b) a green light-emitting layer in contact with the blue light-emitting layer;

(c) a red light-emitting layer in contact with either the blue light-emitting layer or the green light-emitting layer; and

(d) an electron-transporting layer disposed between the light-emitting layers and the cathode, wherein the red light-emitting layer, green light-emitting layer, blue light-emitting layer, and the electron-transporting layer each include an independently selected anthracene compound of Formula (1);

2. The OLED device of claim 1 wherein the blue light-emitting layer is disposed closer to the cathode than to the anode.

3. The OLED device of claim 1 wherein the electron-transporting layer has a thickness in a range of 10 to 100 nm.

4. The OLED device of claim 1 wherein the anthracene compound in the electron-transporting layer comprises greater than 10% of the layer by volume.

5. The OLED device of claim 1 wherein the anthracene compound in the red light-emitting layer comprises from 10% to 50% of the layer by volume.

6. The OLED device of claim 1 wherein the anthracene compound in the green light-emitting layer comprises from 50% to 99.5% of the layer by volume.

7. The OLED device of claim 1 wherein the anthracene compound in the blue light-emitting layer comprises from 50% to 99.5% of the layer by volume.

8. The OLED device of claim 1 wherein, the anthracene compound in the red light-emitting layer, green light-emitting layer, blue light-emitting layer, and electron-transporting layer are the same.

9. The OLED device of claim 8 wherein the electron-transporting layer further contains at least one salt or complex of an element selected from Group 1, 2, 12 or 13 of the Periodic Table.

10. The OLED device of claim 1 further including an electron-injecting layer.

11. The OLED device of claim 1 wherein the electron-transporting layer further contains at least one salt or complex of an element selected from Group 1, 2, 12 or 13 of the Periodic Table.

12. The OLED device of claim 11 wherein the salt or complex is a metal complex represented by Formula (2):

(M)_m(Q)_n 

 

(2)

wherein;

M represents an alkali or alkaline earth metal,

each Q represents an independently selected ligand; and

m and n are integers selected to provide a neutral charge on the complex (2).

13. The OLED device of claim 12 wherein M represents Li+ and Q represents an 8-quinolate group.

14. The OLED device of claim 1 wherein W₉ and W₁₀ are independently selected from phenyl, biphenyl, naphthyl or anthracenyl groups, and W₁-W₈ are independently selected from hydrogen, alkyl or phenyl groups.

15. The OLED device of claim 1 wherein the anthracene compound in the electron-transporting layer is selected from the following compounds or their derivatives:

16. The OLED device of claim 1 further including a hole-transporting layer disposed between the light-emitting layers and the anode.

17. The OLED device of claim 16 wherein the hole-transporting layer includes from 10 to 50% by volume of an anthracene compound of Formula (1).

18. A white light-emitting OLED device comprising:

a) an anode and a cathode;

b) at least four light-emitting layers provided between the anode and the cathode, wherein each of the four light-emitting layers produces a different emission spectrum when current passes between the anode and cathode, and such spectra combine to form white light; and

c) wherein the four light-emitting layers include a red light-emitting layer, a yellow light-emitting layer, a blue light-emitting layer, and a green light-emitting layer, arranged such that;

i) each of the light-emitting layers is in contact with at least one other light-emitting layer,

ii) the blue light-emitting layer is in contact with the green light-emitting layer,

iii) the red light-emitting layer is in contact with only one other light-emitting layer; and

d) an electron-transporting layer disposed between the light-emitting layers and the cathode, wherein the yellow light-emitting layer, blue light-emitting layer, red light-emitting layer, green light-emitting layer and electron-transporting layer each include an independently selected anthracene compound of Formula (1);

19. The OLED device of claim 18 wherein, the anthracene compound in the red light-emitting layer, yellow light-emitting layer, blue light-emitting layer, green light-emitting layer, and electron-transporting layer are the same.

20. The OLED device of claim 18 wherein the electron-transporting layer further contains at least one salt or complex of an element selected from Group 1, 2, 12 or 13 of the Periodic Table.

21. The OLED device of claim 18 wherein W₉ and W₁₀ are independently selected from phenyl, biphenyl, naphthyl or anthracenyl groups, and W₁-W₈ are independently selected from hydrogen, alkyl or phenyl groups.