CN100346496C - Organic electroluminescent component - Google Patents
Organic electroluminescent component Download PDFInfo
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- CN100346496C CN100346496C CNB021416990A CN02141699A CN100346496C CN 100346496 C CN100346496 C CN 100346496C CN B021416990 A CNB021416990 A CN B021416990A CN 02141699 A CN02141699 A CN 02141699A CN 100346496 C CN100346496 C CN 100346496C
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Abstract
The present invention relates to an organic electroluminescent element which is composed of a cathode, an indium-tin oxide anode, a luminescent layer, an electric hole transmission layer, an electron transmission layer, an electric hole injection layer and an intermediate layer, wherein the luminescent layer is positioned between the cathode and the indium-tin oxide anode, and the electric hole transmission layer is positioned between the luminescent layer and the indium-tin oxide anode; the electron transmission layer is positioned between the luminescent layer and the cathode, the electric hole injection layer is positioned between the electric hole transmission layer and the indium-tin oxide anode, and the intermediate layer is positioned between the electric hole injection layer and the electric hole transmission layer.
Description
Technical field
The invention relates to a kind of light-emitting component, and be particularly to a kind of organic electroluminescent (organic electroluminescent is called for short OEL) element.
Background technology
Organic electroluminescent has characteristics such as self-luminous, wide viewing angle (reaching 160 degree), high answer speed, low driving voltage, full color, but practicability at present, can be applicable to the color plane display element, for example small-sized display floater, outdoor display board, computer and video screen etc.And organic electroluminescent device is to utilize two electrode package anchor clamps that the organic membrane of the characteristics of luminescence is arranged, when applying direct voltage, the hole can electronics can be injected by negative electrode (cathode) by anode (anode) injection, because the potential difference that extra electric field caused, make charge carrier (carrier) move and produce combination again in film, part can be excited light emitting molecule in conjunction with the energy of being emitted by the electron hole again and form single excite state molecule.When single excite state molecule releases energy when getting back to ground state, wherein a certain proportion of energy can be emitted and luminous in the mode of photon, and this is the element principle of organic electroluminescent.
The essential structure of known organic electroluminescent device is as substrate by a glass, then by negative electrode and transparent indium-tin-oxide (indium tin oxide, abbreviation ITO) folder one deck has the organic compound of the characteristics of luminescence as luminescent layer (emitting layer is called for short EML) in the anode.In addition, for injection and the transmission that makes charge carrier reaches balance, in the structure of organic electroluminescent device, more comprise the hole transmission layer (hole transport layer is called for short HTL) that is positioned between luminescent layer and anode, in order to the hole is injected and transmission by electrode; Be positioned at the electron transfer layer (electron transport layer is called for short ETL) between luminescent layer and negative electrode, inject and transmission by electrode in order to electronics; And be positioned at hole injection layer between hole transmission layer and anode (hole injectinglayer is called for short HIL), and be when voltage is low, still luminescent layer can be injected in the hole.
The present hole injection layer that uses, the material of multiselect as CuPc (Copper phthalocyanine).And after changing the material of hole transmission layer, as shown in Figure 1, Fig. 1 is known employing CuPc/NPB as the organic electroluminescent device (be code name with " A ") of hole injection layer/hole transmission layer and uses CuPc/2T-NATA as the current density (mA/cm as the organic electroluminescent device (being code name with " B ") of hole injection layer/hole transmission layer
2) to the data and curves figure of driving voltage (V).The material of high transfer rate characteristic have as shown in Figure 1 during as hole transmission layer, can obviously promote hole injection rate, can reduce driving voltage simultaneously.Yet, when utilizing as the material of the tool high transfer rate characteristic of 2T-NATA during as hole transmission layer, the situation that the charge carrier compounding efficiency is not cited but can take place.
Summary of the invention
Therefore, the purpose of this invention is to provide a kind of organic electroluminescent device,, promote the efficient of organic electroluminescent device with when hole injection rate increases.
According to above-mentioned and other purpose, the present invention proposes a kind of organic electroluminescent device, be made up of a negative electrode, an anode, one deck luminescent layer, one deck hole transmission layer, one deck electron transfer layer, one deck hole injection layer and one deck intermediate layer, its configuration luminescent layer is positioned between negative electrode and anode; Hole transmission layer is positioned between luminescent layer and anode; Electron transfer layer is positioned between luminescent layer and negative electrode; The intermediate layer of tool high transfer rate characteristic is positioned between hole transmission layer and hole injection layer; Wherein the transmission rate in intermediate layer is than hole transmission layer and hole injection layer transmission rate height.
The present invention is because add the higher intermediate layer of one deck transmission rate, so can promote the efficient of organic electroluminescent device when increasing hole injection rate in the material of two tool hole transport characteristics.
Description of drawings
Fig. 1-A is known employing CuPc/NPB as the organic electroluminescent device of hole injection layer/hole transmission layer and Fig. 1-B is the known CuPc/2T-NATA of employing as the current density of the organic electroluminescent device of the hole injection layer/hole transmission layer data and curves figure to driving voltage;
Fig. 2 is the structural representation according to the organic electroluminescent device of a preferred embodiment of the present invention;
Figure 3 shows that according to the organic electroluminescent device of a preferred embodiment of the present invention and known employing CuPc/NPB as the organic electroluminescent device efficient of hole injection layer/hole transmission layer data and curves figure voltage;
Figure 4 shows that according to the organic electroluminescent device of a preferred embodiment of the present invention and known employing CuPc/NPB as the organic electroluminescent device hole injection rate of hole injection layer/hole transmission layer data and curves figure driving voltage.
200: organic electroluminescent device
202: anode
204: negative electrode
206: luminescent layer
208: hole transmission layer
210: electron transfer layer
212: the intermediate layer
214: hole injection layer
Embodiment
Fig. 2 is the structural representation according to the organic electroluminescent device of a preferred embodiment of the present invention, please refer to Fig. 2, organic electroluminescent device 200 is by an anode 202, one negative electrode 204, one deck luminescent layer (emitting layer, be called for short EML) 206, one deck hole transmission layer (holetransport layer, be called for short HTL) 208, one deck electron transfer layer (electron transportlayer, be called for short ETL) 210, one deck hole injection layer (hole injecting layer, be called for short HIL) 214 and one deck intermediate layer 212 form, it is configured to luminescent layer 206 and is positioned at 202 on negative electrode 204 and indium tin oxide anode; Hole transmission layer 208 is positioned at 202 on luminescent layer 206 and indium tin oxide anode; Electron transfer layer 210 is positioned at 204 on luminescent layer 206 and negative electrode; Hole injection layer 214 is positioned at 202 on hole transmission layer 208 and indium tin oxide anode; And the intermediate layer 212 of tool high transfer rate is positioned at 214 of hole transmission layer 208 and hole injection layers, and wherein the transmission rate in intermediate layer 212 (mobility) is than the transmission rate height of hole transmission layer 208.
Please continue with reference to Fig. 2, wherein the material of anode 202 for example is indium tin oxide (indiumtin oxide is called for short ITO); The material of negative electrode 204 for example is magnesium silver alloy (Mg/Ag), lithium fluoride and aluminium (LiF/Al) or other metal material; And the material of luminescent layer 206 for example is Alq:DCJTB ((8-hydroxyquinoline): (4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran)); The material of hole transmission layer 208 for example is a nitrogen, nitrogen '-two (1-naphthyl)-nitrogen, nitrogen ' two-(phenyl)-benzidine (N '-diphenyl-benzidine is called NPB again for N, N '-Di (naphthalene-1-yl)-N); The material of electron transfer layer 210 then for example is that (tri-(8-hydroxyquinoline) aluminum claims Alq again to three-(oxine) aluminium
3), PPV (poly (p-phenylenevinylene)) etc.; The material of hole injection layer 214 for example is the derivative CuPc (Copper phthalocyanine) of benzene dimethylan element (Phthalocyanine); And the material in intermediate layer 212 is derivatives of triphenylamine (Tri-phenyamine), for example is 3-4,4 ' 4 "-(2-naphthyl)-triphenylamine (Tris-4,4 ' 4 "-(2-naphthyl)-triphenylamine, claim 2T-NATA again).And, please refer to shown in Figure 3 for the organic electroluminescent device 200 that proves present embodiment has more efficient with CuPc/NPB as the known configurations of hole injection layer/hole transmission layer than known.
Figure 3 shows that organic electroluminescent device (is code name with " C ") and known employing CuPc/NPB according to a preferred embodiment of the present invention is as organic electroluminescent device (is code name with " the A ") efficient (cd/A) of the hole injection layer/hole transmission layer data and curves figure to voltage (V), by this figure as can be known, when voltage rises to 4V, the about 3.5cd/A of the efficiency value of organic electroluminescent device of the present invention, and known organic electroluminescent device can't be luminous under so low voltage, even if voltage rises gradually, the efficient of organic electroluminescent device of the present invention is still greater than known elements.Therefore, organic electroluminescence assembly of the present invention is simple more efficient as the known configurations of hole injection layer/electron transfer layer with CuPc/NPB really.
And, as shown in Figure 4, Figure 4 shows that organic electroluminescent device (is code name with " C ") and organic electroluminescent device (with " A " the is code name) current density (mA/cm of known employing CuPc/NPB as hole injection layer/hole transmission layer according to a preferred embodiment of the present invention
2) to the data and curves figure of driving voltage (V), because the organic electroluminescent device of present embodiment 200 adopts the hole mobile material 212 of one deck tool high transfer rate characteristics, so the hole injection rate height of the more known general organic electroluminescent device (A) of its hole injection rate.
As mentioned above, feature of the present invention is by add the higher intermediate layer of one deck transmission rate between hole injection layer and hole transmission layer, therefore can be when increasing hole injection rate, promote the efficient of organic electroluminescent device, and can not have higher driving voltage as known elements.
Claims (16)
1. an organic electroluminescent device is characterized in that, this element comprises:
One negative electrode;
One anode is positioned under this negative electrode;
One luminescent layer is between this negative electrode and this anode;
One hole transmission layer is positioned between this luminescent layer and this anode;
One electron transfer layer is positioned between this luminescent layer and this negative electrode;
One hole injection layer is positioned between this hole transmission layer and this anode; And
One intermediate layer, between this hole injection layer and hole transmission layer, wherein the transmission rate in this intermediate layer is than the transmission rate height of this hole transmission layer.
2. organic electroluminescent device as claimed in claim 1 is characterized in that, the material in this intermediate layer comprises the derivative of triphenylamine.
3. organic electroluminescent device as claimed in claim 2 is characterized in that the material in this intermediate layer comprises 3-4,4 ' 4 "-(2-naphthyl)-triphenylamine.
4. organic electroluminescent device as claimed in claim 1 is characterized in that the material of this negative electrode comprises lithium fluoride and aluminium.
5. organic electroluminescent device as claimed in claim 1 is characterized in that the material of this anode comprises indium tin oxide.
6. organic electroluminescent device as claimed in claim 1 is characterized in that the material of this hole transmission layer comprises nitrogen, nitrogen '-two (1-naphthyl)-nitrogen, nitrogen ' two-(phenyl)-benzidine.
7. organic electroluminescent device as claimed in claim 1 is characterized in that, the material of this electron transfer layer comprises three-(oxine) aluminium.
8. organic electroluminescent device as claimed in claim 1 is characterized in that the material of this hole injection layer comprises the derivative of benzene dimethylan element.
9. an organic electroluminescent device is characterized in that, this element comprises:
One negative electrode;
One anode is positioned under this negative electrode;
One luminescent layer is between this negative electrode and this anode;
One electron transfer layer is positioned between this luminescent layer and this negative electrode;
One hole transmission layer is positioned between this luminescent layer and this anode;
One hole injection layer is positioned between this hole transmission layer and this anode; And
One intermediate layer, between this hole injection layer and hole transmission layer, wherein the transmission rate in this intermediate layer is than the transmission rate height of this hole injection layer.
10. organic electroluminescent device as claimed in claim 9 is characterized in that, the material in this intermediate layer comprises the derivative of triphenylamine.
11. organic electroluminescent device as claimed in claim 9 is characterized in that, the material in this intermediate layer comprises 3-4,4 ' 4 "-(2-naphthyl)-triphenylamine.
12. organic electroluminescent device as claimed in claim 9 is characterized in that, the material of this negative electrode comprises lithium fluoride and aluminium.
13. organic electroluminescent device as claimed in claim 9 is characterized in that, the material of this anode comprises indium tin oxide.
14. organic electroluminescent device as claimed in claim 9 is characterized in that, the material of this hole injection layer comprises the derivative of benzene dimethylan element.
15. organic electroluminescent device as claimed in claim 9, wherein the material of this hole transmission layer comprises nitrogen, nitrogen '-two (1-naphthyl)-nitrogen, nitrogen ' two-(phenyl)-benzidine.
16. organic electroluminescent device as claimed in claim 9, wherein the material of this electron transfer layer comprises three-(oxine) aluminium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021416990A CN100346496C (en) | 2002-09-13 | 2002-09-13 | Organic electroluminescent component |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021416990A CN100346496C (en) | 2002-09-13 | 2002-09-13 | Organic electroluminescent component |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1482839A CN1482839A (en) | 2004-03-17 |
| CN100346496C true CN100346496C (en) | 2007-10-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021416990A Expired - Lifetime CN100346496C (en) | 2002-09-13 | 2002-09-13 | Organic electroluminescent component |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0948063A2 (en) * | 1998-03-02 | 1999-10-06 | Kido, Junji | Organic electroluminescent devices |
| CN1236489A (en) * | 1996-11-07 | 1999-11-24 | 达勒姆大学 | Polymer light emitting diode |
| JP2001267081A (en) * | 2000-03-16 | 2001-09-28 | Matsushita Electric Ind Co Ltd | Organic electroluminescence element |
| EP1227527A2 (en) * | 2001-01-26 | 2002-07-31 | Xerox Corporation | Organic light emitting devices |
-
2002
- 2002-09-13 CN CNB021416990A patent/CN100346496C/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1236489A (en) * | 1996-11-07 | 1999-11-24 | 达勒姆大学 | Polymer light emitting diode |
| EP0948063A2 (en) * | 1998-03-02 | 1999-10-06 | Kido, Junji | Organic electroluminescent devices |
| JP2001267081A (en) * | 2000-03-16 | 2001-09-28 | Matsushita Electric Ind Co Ltd | Organic electroluminescence element |
| EP1227527A2 (en) * | 2001-01-26 | 2002-07-31 | Xerox Corporation | Organic light emitting devices |
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| CN1482839A (en) | 2004-03-17 |
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