CN1825662A - Organic electroluminescent device - Google Patents
Organic electroluminescent device Download PDFInfo
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- CN1825662A CN1825662A CN 200610007137 CN200610007137A CN1825662A CN 1825662 A CN1825662 A CN 1825662A CN 200610007137 CN200610007137 CN 200610007137 CN 200610007137 A CN200610007137 A CN 200610007137A CN 1825662 A CN1825662 A CN 1825662A
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Abstract
The invention reveals an organic electroluminescent device, comprising: a metallic anode, a composite cathode and a multilayer organic material layer between the two electrodes, where the organic material layer comprises a fluorocarbon layer contacting with the metallic anode and the composite cathode comprises: a low power functional metallic layer, a low-activity metallic layer on the low power functional metallic layer and a covering layer on the low-activity metallic layer.
Description
Technical field
The present invention relates to a kind of flat display apparatus, particularly relate to a kind of Organic Light-Emitting Device (organic electro-luminescence device, OELD), in order to improve the quality of colors of image.
Background technology
(organic light-emitting diode OLED), is a kind of emissive type element that uses organic material for Organic Light-Emitting Device (OELD) or light-emitting diode.Need the strict brilliant requirement of length compared to traditional inorganic light-emitting diode (LED), Organic Light-Emitting Device can be produced on the large-area substrates easily, forms noncrystalline (amorphous) film.On the other hand, Organic Light-Emitting Device also differs from lcd technology, does not need backlight (backlight), therefore can simplify technology.Along with technology develops rapidly, following Organic Light-Emitting Device will be applied on the full-color display floaters of small size such as personal digital assistant, digital camera,, can extend on large-sized computer and the video screen, even be applied to flexible display during maturation in case this technology more becomes.
Please refer to Fig. 1, it shows existing Organic Light-Emitting Device.Organic Light-Emitting Device 10 comprises: an anode 100, a negative electrode 114 and be arranged at anode 100 and negative electrode 114 between multilayer organic material layer 110.Wherein, multilayer organic material layer 110 comprises: hole transmission layer (the hole transport layer of a contiguous anode 100, HTL) electron transfer layer of 104, one adjacent cathodes (electrontransport layer, ETL) 108 and be arranged at electroluminescence layer (electro-luminescence layer, EL) 106 between hole transmission layer 104 and the electron transfer layer 108.In addition,, an indium tin oxide (ITO) layer 102 is set between anode 100 and hole transmission layer 104 optionally, the work function of anode 100 can be complementary with multilayer organic material layer 110 if anode 100 is a metal material.
When applying a current potential and be worse than between negative electrode 114 and the anode 100, electronics can inject electron transfer layers 108 from negative electrode 114, and passes through electron transfer layer 108 and electroluminescence layer 106.Simultaneously, hole transmission layer 104 can and be passed through from anode 100 injections in the hole.Afterwards, electronics and hole can combine (recombine) again with the interface of hole transmission layer 104 and release energy with luminous form in contiguous electroluminescence layer 106.
Typical Organic Light-Emitting Device is divided into two types of bottom-emission (bottom-emitting) and top light emittings (top-emitting).In full-color active matrix type organic electroluminescent display (AM-OELDs), in conjunction with white light organic electroluminescence device and filter and constitute it.Yet for full-color active matrix type organic electroluminescent display, the drive current that uniformity is provided is considerable.In order to obtain the drive current of uniformity, must in drive circuit, use the electric capacity of thin-film transistor collocation more than four.The light-emitting area of bottom-emission Organic Light-Emitting Device is subject to thin-film transistor.When the thin-film transistor quantity of device increased, (aperture ratio AR) can dwindle the aperture opening ratio of Organic Light-Emitting Device.In order to keep panel luminance, power consumption meeting thereby increase makes the lost of life of electro photo-luminescent apparatus.On the contrary, the light-emitting area of top light emitting organic electroluminescence display device is not subject to thin-film transistor, so can not shorten its life-span.Yet, for white light top light emitting electro photo-luminescent apparatus, because microcavity effect (microcavity effect), generating white light interfered and become monochromatic light (mono-chromatic light).That is microcavity effect can reduce the halfwidth of spectrum, and (full width at halfmaxima FWHM), and can't produce the have wide emission band white light of (broademissive band), reduces the efficient of Organic Light-Emitting Device.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of Organic Light-Emitting Device, it utilizes the combination of specific negative electrode and multilayer organic material layer, increases the efficient of device to improve its emission photochromic (light emitting color).
The invention provides a kind of Organic Light-Emitting Device, comprising: a metal anode, a multilayer organic material layer and a composite cathode.The multilayer organic material layer is positioned on the metal anode, and it comprises that a fluorocarbon layer contacts with metal anode.Composite cathode is positioned on the multilayer organic material layer, and it comprises: cap rock on a low workfunction metal layer, the low activity metal level and.The low activity metal level is positioned on the low workfunction metal layer.Be positioned on the low activity metal level and go up cap rock.
For above and other objects of the present invention, feature and advantage can be become apparent, following conjunction with figs. and preferred embodiment are to illustrate in greater detail the present invention.
Description of drawings
Fig. 1 shows the generalized section of existing Organic Light-Emitting Device.
Fig. 2 shows the generalized section according to the Organic Light-Emitting Device of the embodiment of the invention.
Fig. 3 shows the graph of relation of anode reflectivity (%) and optical wavelength (nm).
Fig. 4 shows the graph of relation of electroluminescence intensity (a.u.) and optical wavelength (nm).
The simple symbol explanation
Existing
10～Organic Light-Emitting Device; 100～anode; 102～indium tin oxide layer; 104～hole transmission layer; 106～electroluminescence layer; 108～electron transfer layer; 110～multilayer organic material layer; 114～negative electrode.
The present invention
20～Organic Light-Emitting Device; 200～metal anode; 201～fluorocarbon layer; 210～multilayer organic material layer; 212～low workfunction metal layer; 214～low activity metal level; 216～upward cap rocks; 218～composite cathode.
Embodiment
Below cooperate Fig. 2 that the Organic Light-Emitting Device of the embodiment of the invention is described.Please refer to Fig. 2, Organic Light-Emitting Device 20 comprises: a metal anode 200, a composite cathode 218 and the multilayer organic material layer 210 between metal anode 200 and composite cathode 218.The material of metal anode 200 comprises silver or aluminum metal.
In the present embodiment, multilayer organic material layer 210 comprises: the hole injection layer of an adjacent metal anode 200 (hole injection layer, HIL) 201, one is positioned at hole transmission layer (HTL) (not illustrating), on the hole injection layer 201 and is positioned at electroluminescence layer (EL) (not illustrating), on the hole transmission layer and is positioned at electron transfer layer (ETL) (not illustrating) on the electroluminescence layer and the electron injecting layer between electron transfer layer and composite cathode 218 (electron injection layer EIL) (does not illustrate).The thickness of multilayer organic material layer 210 is about the scope of 1000 to 5000 dusts ().
Moreover, the hole injection layer 201 that is arranged at metal anode 200 tops and is in contact with it, its material comprises fluorocarbon (CF
x), for example hydrogeneous fluorocarbon (CHF
3).This fluorocarbon layer 201 as hole injection layer can reduce the energy barrier between multilayer organic material layer 210 and the metal anode 200.Moreover fluorocarbon layer 201 can reduce the reflectivity of metal anode 200 to relax the interference of light effect.
Please refer to Fig. 3, it shows the graph of relation of anode reflectivity (%) and optical wavelength (nm), wherein solid line represents that thickness is the single silver metal level of 200nm, and dotted line represents that thickness is the silver metal layer of 200nm and the double-decker of the fluorocarbon layer that is positioned at the top.As shown in Figure 3, under different optical wavelength, fluorocarbon layer 201 can reduce the reflectivity of metal anode 200.In the present embodiment, the material of the electroluminescence layer in the multilayer organic material layer 210 is a white light emitting material, and it comprises two or more alloys.
Composite cathode 218 comprises: a low workfunction metal layer 212 and is positioned at the low activity metal level 214 on the low workfunction metal layer 212.Compared to single thin metal layer as negative electrode, can increase the electrical conductivity of negative electrode.In the present embodiment, the material of low workfunction metal layer 212 comprises alkali gold or alkaline-earth metal, for example the calcium metal.Moreover the thickness of low workfunction metal layer 212 is in the scope of 50 to 200 dusts.What herein, " low work function " was represented is that work function is not more than 3.0eV.
The material of low activity metal level 214 comprises silver, aluminium or copper metal.Moreover the thickness of low activity metal level 214 is in the scope of 50 to 200 dusts.Herein, what " low activity " was represented is the electron affinity of work function greater than oxygen, is about 3.5eV.
In the present embodiment, photochromic for the emission that further improves Organic Light-Emitting Device 20, composite cathode 218 need comprise further that one has the last cap rock 216 of suitable refractive index and penetrance, and it is positioned at low activity metal level 214 tops.For example, last cap rock 216 refractive indexes need greater than 2.0, and its penetrance needs greater than 8.0.Therefore, the material of last cap rock 216 can comprise: tin oxide (SnO
2), tungsten oxide (WO
3), zinc sulphide (ZnS) or zinc selenide (ZnSe).In addition, the thickness of last cap rock 216 must be controlled at a particular range, avoids its serious penetrance that reduces composite cathode 218.In the present embodiment, last cap rock 216 thickness are in 7.5 to 30nm scope, and are preferably 15 to 22.5nm scope.
Please refer to Fig. 4, it shows the graph of relation of electroluminescence intensity (a.u.) and optical wavelength (nm), and wherein curve A is represented existing white light organic electroluminescence device 10, as shown in Figure 1; Curve B is represented the white light organic electroluminescence device 20 according to the embodiment of the invention, as shown in Figure 2.As shown in Figure 4, do not go up the Organic Light-Emitting Device 10 of cap rock and fluorocarbon layer, the white light that its electroluminescence layer is sent becomes monochromatic light because of microcavity effect makes the halfwidth of white-light spectrum reduce.On the contrary, have the Organic Light-Emitting Device 20 of last cap rock 216 and fluorocarbon layer 201, the white light that the electroluminescence layer is sent still has wide emission band.
Therefore, can apply to full-color active matrix type organic electroluminescent display according to Organic Light-Emitting Device of the present invention, the organic electro-luminescent display that particularly has top lighting structure, with when the drive current of uniformity is provided, the emission that still can improve display is photochromic, and then promotes the efficient of display.
Though the present invention discloses as above with preferred embodiment; yet it is not in order to limit the present invention; those skilled in the art can do a little change and retouching without departing from the spirit and scope of the present invention, thus protection scope of the present invention should with accompanying Claim the person of being defined be as the criterion.
Claims (10)
1, a kind of Organic Light-Emitting Device comprises:
Metal anode;
The multilayer organic material layer is positioned on this metal anode, and it comprises that the fluorocarbon layer contacts with this metal anode; And
Composite cathode is positioned on this multilayer organic material layer, and it comprises:
The low workfunction metal layer;
The low activity metal level is positioned on this low workfunction metal layer; And
Last cap rock is positioned on this low activity metal level.
2, Organic Light-Emitting Device as claimed in claim 1, wherein this metal anode comprises silver or aluminum metal.
3, Organic Light-Emitting Device as claimed in claim 1, wherein this multilayer organic material layer comprises white light emitting material.
4, Organic Light-Emitting Device as claimed in claim 1, wherein this multilayer organic material layer comprises luminescent material, it comprises two or more alloys.
5, Organic Light-Emitting Device as claimed in claim 1, wherein this low workfunction metal layer comprises alkali gold or alkaline-earth metal.
6, Organic Light-Emitting Device as claimed in claim 5, wherein this low workfunction metal layer comprises the calcium metal level.
7, Organic Light-Emitting Device as claimed in claim 5, wherein the thickness of this low workfunction metal layer is in the scope of 50 to 200 dusts.
8, Organic Light-Emitting Device as claimed in claim 1, wherein this low activity metal level comprises silver, aluminium or copper metal.
9, Organic Light-Emitting Device as claimed in claim 8, wherein this low activity metal layer thickness is in the scope of 50 to 200 dusts.
10, Organic Light-Emitting Device as claimed in claim 1 wherein should go up cap rock and comprise SnO
2, WO
3, ZnS or ZnSe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610007137 CN1825662A (en) | 2006-02-09 | 2006-02-09 | Organic electroluminescent device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610007137 CN1825662A (en) | 2006-02-09 | 2006-02-09 | Organic electroluminescent device |
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| CN1825662A true CN1825662A (en) | 2006-08-30 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102569670A (en) * | 2012-03-21 | 2012-07-11 | 四川虹视显示技术有限公司 | Organic light-emitting diode (OLED) composite transparent cathode structure and preparation method thereof |
| CN102593373A (en) * | 2012-03-21 | 2012-07-18 | 四川虹视显示技术有限公司 | Organic light emitting diode (OLED) composite transparent negative pole structure and preparation method thereof |
| CN104124338A (en) * | 2013-04-24 | 2014-10-29 | 海洋王照明科技股份有限公司 | Organic light-emitting device and preparation method thereof |
| CN104124384A (en) * | 2013-04-28 | 2014-10-29 | 海洋王照明科技股份有限公司 | Organic electroluminescent device and preparation method thereof |
| CN104124345A (en) * | 2013-04-24 | 2014-10-29 | 海洋王照明科技股份有限公司 | Organic electroluminescent device and preparation method thereof |
| CN104701338A (en) * | 2013-12-09 | 2015-06-10 | 昆山国显光电有限公司 | Organic light-emitting display device and mask plate thereof |
| WO2018127127A1 (en) * | 2017-01-05 | 2018-07-12 | 昆山工研院新型平板显示技术中心有限公司 | Electrode and organic electroluminescent component applying same |
| CN108281562A (en) * | 2017-01-05 | 2018-07-13 | 昆山工研院新型平板显示技术中心有限公司 | A kind of electrode and apply its organic electroluminescence device |
| CN111211239A (en) * | 2018-11-22 | 2020-05-29 | 广东聚华印刷显示技术有限公司 | Composite cathode structure and organic electroluminescent device |
-
2006
- 2006-02-09 CN CN 200610007137 patent/CN1825662A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102569670A (en) * | 2012-03-21 | 2012-07-11 | 四川虹视显示技术有限公司 | Organic light-emitting diode (OLED) composite transparent cathode structure and preparation method thereof |
| CN102593373A (en) * | 2012-03-21 | 2012-07-18 | 四川虹视显示技术有限公司 | Organic light emitting diode (OLED) composite transparent negative pole structure and preparation method thereof |
| CN104124338A (en) * | 2013-04-24 | 2014-10-29 | 海洋王照明科技股份有限公司 | Organic light-emitting device and preparation method thereof |
| CN104124345A (en) * | 2013-04-24 | 2014-10-29 | 海洋王照明科技股份有限公司 | Organic electroluminescent device and preparation method thereof |
| CN104124384A (en) * | 2013-04-28 | 2014-10-29 | 海洋王照明科技股份有限公司 | Organic electroluminescent device and preparation method thereof |
| CN104701338A (en) * | 2013-12-09 | 2015-06-10 | 昆山国显光电有限公司 | Organic light-emitting display device and mask plate thereof |
| WO2018127127A1 (en) * | 2017-01-05 | 2018-07-12 | 昆山工研院新型平板显示技术中心有限公司 | Electrode and organic electroluminescent component applying same |
| CN108281562A (en) * | 2017-01-05 | 2018-07-13 | 昆山工研院新型平板显示技术中心有限公司 | A kind of electrode and apply its organic electroluminescence device |
| JP2020513660A (en) * | 2017-01-05 | 2020-05-14 | 昆山工研院新型平板顕示技術中心有限公司Ｋｕｎｓｈａｎ Ｎｅｗ Ｆｌａｔ Ｐａｎｅｌ Ｄｉｓｐｌａｙ Ｔｅｃｈｎｏｌｏｇｙ Ｃｅｎｔｅｒ Ｃｏ．， Ｌｔｄ． | Electrode and organic electroluminescence device using the same |
| US10658603B2 (en) | 2017-01-05 | 2020-05-19 | Kunshan New Flat Panel Display Technology Center Co., Ltd. | Electrode and an organic electroluminescent device using the same |
| US10957872B2 (en) | 2017-01-05 | 2021-03-23 | Kunshan New Flat Panel Display Technology Center Co. Ltd. | Electrode and organic electroluminescent device using same |
| CN111211239A (en) * | 2018-11-22 | 2020-05-29 | 广东聚华印刷显示技术有限公司 | Composite cathode structure and organic electroluminescent device |
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