Organic electroluminescence device

• US 20050140275A1
• Filed: 12/23/2004
• Published: 06/30/2005
• Est. Priority Date: 12/29/2003
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Park, Jae Yong
• Granted Patent: US 7,696,681 B2
• Time in Patent Office: Days
• US Class Current: 313/504
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 50/125 specially adapted for multicolour light emission, e.g. for emitting white light
• CPC Class Codes: H10K 50/865 comprising light absorbing layers, e.g. light-blocking layers
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/127 comprising two substrates, e.g. display comprising OLED array and TFT driving circuitry on different substrates
• CPC Class Codes: H10K 59/32 Stacked devices having two or more layers, each emitting at different wavelengths
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 59/8792 comprising light absorbing layers, e.g. black layers

Abstract

An organic electronluminescence device includes an array element divided into sub-pixels and including thin film transistors formed in the sub-pixels; a color conversion portion disposed below a second substrate and including a red (R), green (G) and blue (B) conversion layer for converting white light into three primary colors of red (R), green (G) and blue (B); a first electrode disposed below the color conversion portion and including a transparent conductive material; an organic EL layer disposed below the first electrode in the sub-pixels and including a plurality of stack units each including a charge generation layer, an electrode transporting layer, a hole transporting layer and an emission layer; a second electrode patterned below the organic EL layer in the sub-pixels; and a conductive spacer electrically connecting the thin film transistors with the second electrode.

Claims

1. An organic electroluminescence (EL) device, comprising:

a first substrate and a second substrate spaced apart from each other by a predetermined interval and facing each other;

an array element divided into sub-pixels and including thin film transistors formed in the sub-pixels;

a color conversion portion disposed below the second substrate and including a red (R), green (G) and blue (B) conversion layer for converting white light into three primary colors of red (R), green (G) and blue (B);

a first electrode disposed below the color conversion portion and including a transparent conductive material;

an organic EL layer disposed below the first electrode in the sub-pixels and including a plurality of stack units each including a charge generation layer, an electrode transporting layer, a hole transporting layer and an emission layer;

a second electrode patterned below the organic EL layer in the sub-pixels; and

a conductive spacer electrically connecting the thin film transistors with the second electrode.

2. The organic EL device according to claim 1, wherein the emission layer includes any one of red (R), green (G) and blue (B) emission materials.

3. The organic EL device according to claim 1, wherein, when the first electrode is an anode and the second electrode is a cathode, the organic EL layer includes:

a first unit including a first electron transporting layer contacting the first electrode, a first emission layer containing a blue emission material, a first hole transporting layer and a first charge generation layer that are sequentially disposed starting from the first electron transporting layer;

a second unit including a second electron transporting layer, a second emission layer containing a green emission material, a second hole transporting layer, and a second charge generation layer that are disposed below the first charge generation layer; and

a third unit including a third electron transporting layer, a third emission layer containing a red emission material and a third hole transporting layer that are disposed below the second charge generation layer.

4. The organic EL device according to claim 1, wherein, when power is applied to the first and second electrodes, the charge generation layer generates and supplies electrons and holes to the electron transporting layer and the hole transporting layer.

5. The organic EL device according to claim 1, wherein the charge generation layer includes V₂O₅.

6. The organic EL device according to claim 1, wherein the electron transporting layer includes Cs:

BCP.

7. The organic EL device according to claim 1, wherein the hole transporting layer includes α

-NPD.

8. An organic electroluminescence (EL) device, comprising:

a first substrate and a second substrate spaced apart from each other by a predetermined interval and facing each other;

an array element divided into sub-pixels and including thin film transistors formed in the sub-pixels;

color filters disposed below the second substrate;

a first electrode disposed below the color filters and including a transparent conductive material;

an organic EL layer disposed below the first electrode in the sub-pixels and including a plurality of stack units each including a charge generation layer (CGL), an electrode transporting layer (ETL), a hole transporting layer (HTL) and an emission layer (EMT);

a second electrode patterned below the organic EL layer in the sub-pixels; and

a conductive spacer electrically connecting the thin film transistors with the second electrode.

9. The organic EL device according to claim 8, wherein the emission layer includes any one of red (R), green (G) and blue (B) emission materials.

10. The organic EL device according to claim 8, wherein, when the first electrode and the second electrode are designed to be cathode and anode, respectively, the organic EL layer includes:

a first unit including a first electron transporting layer (ETL), a first emission layer (EML) containing a blue emission material, a first hole transporting layer (HTL), and a first charge generation layer (CGL) that are sequentially disposed starting from the first ETL contacting the first electrode;

a second unit including a second ETL, a second EML containing a green emission material, a second HTL, and a second CGL that are disposed below the first CGL; and

a third unit including a third ETL, a third EML containing a red emission material and a third HTL that are disposed below the second CGL.

11. The organic EL device according to claim 8, wherein, when power is applied to the first and second electrodes, the CGL generates and supplies electrons and holes to the adjacent ETL and HTL.

12. The organic EL device according to claim 8, wherein the CGL includes V₂O₅.

13. The organic EL device according to claim 8, wherein the ETL includes Cs:

BCP.

14. The organic EL device according to claim 8, wherein the HTL includes α

-NPD.