CN102184938A - Organic electroluminescent device and manufacturing method thereof - Google Patents
Organic electroluminescent device and manufacturing method thereof Download PDFInfo
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- CN102184938A CN102184938A CN2011101196487A CN201110119648A CN102184938A CN 102184938 A CN102184938 A CN 102184938A CN 2011101196487 A CN2011101196487 A CN 2011101196487A CN 201110119648 A CN201110119648 A CN 201110119648A CN 102184938 A CN102184938 A CN 102184938A
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Abstract
The invention relates to a colorized organic electroluminescent device. The colorized organic electroluminescent device comprises a substrate, a first electrode, a second electrode, and an organic functional layer arranged between the first electrode and the second electrode; and the organic functional layer at least comprises a red sub-pixel organic functional area, a green sub-pixel organic functional area and a blue sub-pixel organic functional area, wherein the at least one sub-pixel organic functional area comprises a phosphorescent luminous layer which is a non-blue luminous layer, and a blue luminous layer which covers the phosphorescent luminous layer. The invention also relates to a manufacturing method of the colorized organic electroluminescent device, wherein the phosphorescent luminous layer is manufactured on a phosphorescent sub-pixel part by using a precise mask, the blue luminous layer is manufactured by using a third open mask, and the blue luminous layer covers phosphorescent sub-pixels and blue sub-pixels.
Description
Technical field
The present invention relates to organic electroluminescence device, the preparation method of especially color organic electroluminescence device, and this organic electroluminescence device.
Background technology
In recent years, Organic Light Emitting Diode (OLED) display receives very big concern in the flat panel display field, show boundless application prospect, this is because it is compared with traditional LCD, possess a lot of distinct advantages, as, self-luminous, low-power consumption, wide viewing angle, fast, the wide colour gamut of response speed, can be prepared into flexible display etc.OLED realizes that the method for colorize is a lot, comprises RGB three primary colors method, look transformation approach, colored filter method, microresonator adjusting method etc., and wherein RGB three primary colors method is the most ripe at present method, is also used by domestic and international manufacturer.Its preparation process requirement, when layer shared at evaporation needs open mask (open mask), such as, hole injection layer (HIL), hole transmission layer (HTL), electron transfer layer (ETL) material that evaporation is shared, and evaporation metal electrode.In addition, when the non-shared RGB luminescent layer of evaporation, need three accurate contrapositions, also need three precision mask (shadow mask).Along with more and more higher requirement to display picture element resolution, alignment system and precision mask to the OLED evaporated device have also proposed higher challenge, the equipment of high accuracy alignment system and high accuracy mask are all very expensive, have increased the cost of manufacture of OLED greatly.
Summary of the invention
The objective of the invention is to propose a kind of organic electroluminescence device, it has low cost of manufacture and the high advantage of luminous efficiency.
According to an aspect of the present invention, the invention provides a kind of color organic electroluminescence device, comprising: substrate; First electrode; Second electrode; And be arranged at organic function layer between this first and second electrode, this organic function layer comprises three kinds of sub-pix organic functionses of red, green, blue district at least, wherein at least a sub-pix organic functions district comprises: the phosphorescence luminescent layer, and this phosphorescence luminescent layer is non-blue light-emitting; And blue light-emitting, wherein, this blue light-emitting covers this phosphorescence luminescent layer.
On the other hand, the phosphorescence luminescent layer comprises red light luminescent layer or green luminescence layer.
On the other hand, blue light-emitting comprises blue light fluorescence radiation layer.
On the other hand, organic electroluminescence device is the luminous organic electroluminescence device in the end.
On the other hand, first electrode is an anode, and second electrode is a negative electrode.
On the other hand, organic function layer comprises: hole injection layer/hole transmission layer/phosphorescence luminescent layer/blue light fluorescence coating/electron transfer layer and/or electron injecting layer.
On the other hand, organic function layer comprises: hole injection layer/hole transmission layer/blue light fluorescence coating/phosphorescence luminescent layer/electron transfer layer and/or electron injecting layer.
On the other hand, this organic electroluminescence device is the luminous organic electroluminescence device in top.
On the other hand, first electrode is a reflection anode, and second electrode is the transmission negative electrode.
On the other hand, organic function layer comprises: hole injection layer/hole transmission layer/phosphorescence luminescent layer/blue light fluorescence radiation layer/electron transfer layer and/or electron injecting layer.
On the other hand, organic function layer comprises: hole injection layer/hole transmission layer/blue light fluorescence radiation layer/phosphorescence luminescent layer/electron transfer layer and/or electron injecting layer.
On the other hand, has the barrier layer between blue light fluorescence radiation layer and the phosphorescence luminescent layer.
On the other hand, the triplet of the material on barrier layer is more than or equal to the triplet of the material of phosphorescence luminescent layer.
On the other hand, the material on barrier layer is electronic property or hole character.
On the other hand, the character of blue light-emitting is electronic property or hole character.
According to a further aspect in the invention, the invention provides a kind of method for preparing color organic electroluminescence device, comprise step at least: a) on substrate, prepare anode layer; B) on anode layer, prepare insulating barrier, form a plurality of light emitting pixels, comprise phosphorescence sub-pix and blue light sub-pix in each pixel; C) aforesaid substrate is sent to the plasma treatment chamber of evaporated device, carries out plasma treatment; D), load onto the first open mask and carry out the preparation of hole injection layer with aforesaid substrate; E), load onto the second open mask and carry out the preparation of hole transmission layer with aforesaid substrate; F) utilize precision mask partly to carry out the preparation of phosphorescence luminescent layer at the phosphorescence sub-pix, and utilize the 3rd open mask to be prepared blue light-emitting, this blue light-emitting covers phosphorescence sub-pix and blue light sub-pix; G), load onto the 4th open mask and carry out the preparation of electron transfer layer with aforesaid substrate; H), load onto the 5th open mask and carry out the preparation of negative electrode with aforesaid substrate; I) encapsulation.
On the other hand, the phosphorescence sub-pix comprises ruddiness sub-pix and green glow sub-pix.
On the other hand, utilize first precision mask to prepare red light luminescent layer, the corresponding ruddiness sub-pix of the openwork part of this first precision mask; Utilize second precision mask to prepare the green luminescence layer, the corresponding green glow sub-pix of the openwork part of this second precision mask.
On the other hand, this method also is included in the step on preparation barrier layer between phosphorescence luminescent layer and the blue light-emitting.
On the other hand, the triplet of the material on barrier layer is more than or equal to the triplet of the material of described phosphorescence luminescent layer.
Description of drawings
Fig. 1 schematically shows the structure chart of the color organic electroluminescence device of prior art;
Fig. 2 schematically shows the device preparing process of Fig. 1;
Fig. 3 schematically shows the structure chart according to color organic electroluminescence device of the present invention;
Fig. 4 schematically shows the device preparing process of Fig. 3.
Reference numeral
01 ' substrate
02 ' anode
03 ' negative electrode
04 ' hole injection layer
05 ' hole transmission layer
06 ' luminescent layer
08 ' electron transfer layer
101 ' precision mask
102 ' precision mask
103 ' precision mask
01 substrate
02 anode
03 negative electrode
04 hole injection layer
05 hole transmission layer
06 phosphorescence luminescent layer
07 blue light-emitting
08 ' electron transfer layer
101 precision mask
102 precision mask
103 open masks
104 precision mask
105 open masks
Embodiment
The structural formula of main chemical substance that the application at first is described is as follows:
The general structure of organic electroluminescence device of the present invention
The basic structure of organic electroluminescence device of the present invention as shown in Figure 3, comprising substrate 01, this substrate 01 can be glass or flexible substrate, flexible substrate adopts a kind of material in polyesters, the polyamide-based compound; Anode layer 02 can adopt inorganic material or organic conductive polymer, preferably adopts inorganic material tin indium oxide (being called for short ITO); Cathode layer 03 generally adopts the alloy of the lower metal of work functions such as lithium, calcium, strontium, aluminium, indium or they and copper, gold, silver, and perhaps the electrode layer that alternately forms of metal and metal fluoride is preferably according to this LiF layer, Al layer.
Organic electroluminescence device among Fig. 3 also comprises organic function layer, and this organic function layer comprises three kinds of sub-pix organic functionses of red, green, blue district.Wherein, ruddiness and green glow sub-pix organic functions district comprise hole injection layer (HIL) 04, hole transmission layer (HTL) 05, phosphorescence luminescent layer 06 (this phosphorescence luminescent layer can comprise Yellow light emitting floor (corresponding to non-blue light sub-pix part), perhaps comprises red light luminescent layer and green luminescence layer (corresponding respectively to the ruddiness sub-pix and the green glow sub-pix part of pixel)), cover blue light-emitting 07 (can be the fluorescence radiation layer), the electron transfer layer (ETL) 08 of red, green and blue sub-pix part.Wherein, blue light sub-pix organic functions district comprises hole injection layer (HIL) 04, hole transmission layer (HTL) 05, blue light-emitting 07, electron transfer layer (ETL) 08, and blue light-emitting 07 covering red, green and blue sub-pix part, can be the fluorescence radiation layer.There are common hole injection layer (HIL) 04, hole transmission layer (HTL) 05, blue light-emitting 07, electron transfer layer (ETL) 08 in ruddiness, green glow sub-pix organic functions district and blue light sub-pix organic functions district.Although not shown, can also comprise electron injecting layer EIL.
Structure corresponding to ruddiness sub-pix and green glow sub-pix organic functions district has been shown among Fig. 3, wherein, phosphorescence luminescent layer 06 is near anode layer 02 1 sides, blue light-emitting 07 is near cathode layer 03 1 sides, requiring blue light-emitting in this case is electronic property, that is, the electron mobility of blue light-emitting is greater than hole mobility, preferably, at least greater than an order of magnitude.In another embodiment, the phosphorescence luminescent layer is near negative electrode one side, and blue light-emitting is near anode one side, requiring blue light-emitting in this case is hole character, that is, the hole mobility of blue light-emitting is greater than electron mobility, preferably, at least greater than an order of magnitude.
When phosphorescence luminescent layer 06 directly contacts with blue light-emitting 07, and phosphorescence luminescent layer 06 is near anode one side, and blue light-emitting 07 is during near negative electrode one side, and in order to realize higher efficient, preferred, the material of main part of this phosphorescence luminescent layer is the material of electronic property.Preferred, the HOMO energy level of blue light-emitting is lower than the HOMO energy level of phosphorescence luminescent layer.
Phosphorescence luminescent layer 06 can directly not contact with blue light-emitting 07 yet, between phosphorescence luminescent layer and blue light-emitting, has barrier layer BL, the electron mobility on this barrier layer is greater than hole mobility, and the triplet of the material on barrier layer is more than or equal to the triplet of phosphorescence luminescent layer material of main part.Because the existence on independent barrier layer, to the HOMO energy level of the material of blue light-emitting without limits, just can realize higher device efficiency.
Below emphasis is set forth at non-blue light sub-pix organic functions plot structure, enumerate luminous two types of luminous and top, the end respectively, and introduce its preparation method.
The concrete structure of the organic electroluminescence device of end emission type and preparation method
The concrete structure of the organic electroluminescence device of end emission type is: anode/hole injection layer/hole transmission layer/phosphorescence luminescent layer/blue light fluorescence radiation layer/electron transfer layer and/or electron injecting layer/negative electrode; Or anode/hole injection layer/hole transmission layer/blue light fluorescence radiation layer/phosphorescence luminescent layer/electron transfer layer and/or electron injecting layer/negative electrode.
Wherein the phosphorescence luminescent layer is non-blue light-emitting, is preferably the phosphorescence luminescent layer of ruddiness, orange red, gold-tinted, green-yellow light, green glow.
When not having the barrier layer between phosphorescent layer and the blue light fluorescence coating, require:
When the phosphorescence luminescent layer near anode one side, blue light fluorescence radiation layer is during near negative electrode one side, the electron mobility of the material of main part of phosphorescence luminescent layer is greater than hole mobility, preferred, at least one is more than the order of magnitude.When the phosphorescence luminescent layer near negative electrode one side, blue light fluorescence radiation layer is during near anode one side, the hole mobility of phosphorescence luminescent layer is greater than electron mobility, preferred, at least one is more than the order of magnitude.
When having the barrier layer between phosphorescence luminescent layer and the blue light fluorescence radiation layer, require:
When the phosphorescence luminescent layer near anode one side, blue light fluorescence radiation layer is during near negative electrode one side, the electron mobility on barrier layer is greater than hole mobility, preferred, at least one is more than the order of magnitude; When close negative electrode one side of phosphorescence luminescent layer, blue light fluorescence radiation layer is when anode one side, and the hole mobility on barrier layer is greater than electron mobility, and is preferred, at least one is more than the order of magnitude, and the triplet of barrier material is more than or equal to the triplet of phosphorescent layer material of main part.
There is not the emission of blue light fluorescence in the electroluminescent spectrum of above-mentioned device architecture.
The material of main part of the phosphorescence luminescent layer in the above-mentioned device architecture can be a kind of material, also can be two or more material, the dyestuff of phosphorescence luminescent layer also can be one or both or two or more material, and its barrier layer also can be a kind of material or two or more material.
Comparative Examples 1 and embodiment 1:
The device architecture of table 1-1 Comparative Examples 1 and embodiment 1
The device architecture that the technical program adopts is:
Anode/hole injection layer/hole transmission layer/phosphorescence luminescent layer/electron transfer layer/electron injecting layer/negative electrode (Comparative Examples 1-1)
Anode/hole injection layer/hole transmission layer/phosphorescence luminescent layer/blue light fluorescence radiation layer/electron transfer layer/electron injecting layer/negative electrode (embodiment 1-1)
Anode/hole injection layer/hole transmission layer/phosphorescence luminescent layer/barrier layer/blue light fluorescence radiation layer/electron transfer layer/electron injecting layer/negative electrode (embodiment 1-2 to 1-5)
The preparation process of embodiment 1-2 is as follows:
1. utilize the ultrasonic and ultrasonic method of deionized water of the washing agent boil that glass substrate 01 is cleaned, and be placed on infrared lamp under and dry.As anode 02, thickness is 180nm at sputter one deck ITO on glass;
2. the above-mentioned glass substrate that has anode is placed in the vacuum chamber, be evacuated to 1 * 10
-5Pa, the method that adopts double source to steam altogether on above-mentioned anode tunic continues evaporation one deck hole injection layer 04, and speed is 0.1nm/s, and the evaporation thickness is 150nm;
3. on above-mentioned hole injection layer film, continue evaporation one deck hole transmission layer 05, speed is 0.1nm/s, and the evaporation thickness is 20nm;
4. the method that adopts double source to steam is altogether again carried out the evaporation of phosphorescence luminescent layer 06;
5. on above-mentioned phosphorescence luminescent layer, continue evaporation one deck barrier layer;
6. the method that adopts double source to steam is altogether again carried out the evaporation of blue light fluorescence radiation layer 07;
7. on blue light fluorescence radiation layer, continue evaporation one deck electron transport material as electron transfer layer 08;
8. last, evaporation LiF layer and Al layer are as the cathode layer 03 of device successively on above-mentioned luminescent layer, and wherein the evaporation speed of LiF layer is 0.01～0.02nm/s, and thickness is 0.7nm, and the evaporation speed of Al layer is 2.0nm/s, and thickness is 150nm.
The device performance of table 1-2 Comparative Examples 1 and embodiment 1
Comparative Examples 1-1 is independent gold-tinted device, has only the emission of dyestuff YD-1 in the electroluminescent spectrum of device.Comparative Examples 1-1 is used for comparing with all the other devices as the normal component of simple gold-tinted device.Among the embodiment 1-1, after the gold-tinted phosphorescent layer, directly added blue light fluorescence coating BH-1:BD-1, still had only the emission of gold-tinted in the spectrum of device, do not had the emission of blue light, chromaticity coordinates and Comparative Examples basically identical.This be because: the character of the material of main part of gold-tinted phosphorescent layer is electronic property, its electron mobility is greater than hole mobility, and the material of main part of blu-ray layer also is an electronic property, so its recombination region is partial in the gold-tinted layer near in the zone of anode one side, and gold-tinted layer and hole transport bed boundary, at gold-tinted layer and blu-ray layer interface, effectively not compound, so do not have the emission of blue light in the spectrum of device, have only the emission of simple gold-tinted.And owing to added the extra blu-ray layer of one deck, the hole of device inside and electronics be balance more, and the efficient of device is improved.
Among the embodiment 1-2, between gold-tinted layer and blu-ray layer, add the barrier layer Bphen of the electronic property of 5nm, also do not had the emission of blue light in the spectrum of device, consistent with the spectrum of independent gold-tinted device Comparative Examples 1-1.The adding on the barrier layer of very thin 5nm, still do not change the chromaticity coordinates of device, and efficient has obtained further raising, this be because: because the character of barrier layer and gold-tinted phosphorescent layer material of main part all be electronic property, so at this moment, its recombination region still is positioned at the zone of gold-tinted layer near anode one side, and gold-tinted layer and hole transport bed boundary, at the interface of barrier layer and blu-ray layer, effectively not compound, so it is luminous that blue light is not just realized, guaranteed the colorimetric purity of gold-tinted.
Embodiment 1-3, Bphen is replaced by TPBI, and gold-tinted layer main body material is replaced by CBP, the character that TPBI has is the same with Bphen, that is, high electron mobility and high triplet, the result has reached same effect, have only the emission of gold-tinted in the spectrum of device, do not have the emission of blue light.But different with embodiment 1-2 is, this moment is because the character of gold-tinted layer main body material is bipolarity, so its recombination region is positioned at the gold-tinted layer, and the interface on gold-tinted layer and barrier layer.Embodiment 1-4 has used the doped forms of Bphen and TPBI, still can reach same effect.This explanation just can be applied in this scheme as long as the barrier layer possesses electronic property, and the kind of material is wide in range.
Embodiment 1-5 has mixed the TPBI of concentration 40% in CBP after, compare, changed the material on barrier layer, but, still can reach the same effect of embodiment 1-4 as long as guarantee that the character on barrier layer is electronic property with embodiment 1-4.
To sum up explanation covers one deck blue light fluorescence coating after the phosphorescence luminescent layer, can be so that the efficient of device be higher, and the chromaticity coordinates of device is constant substantially.The above results is that the adjusting by recombination region realizes.Preferably, add one deck barrier layer between phosphorescence luminescent layer and blue light fluorescence coating, the amplitude of improved efficiency is bigger, and effect is more excellent.
And, no matter be blue light fluorescence radiation layer when covering phosphorescent layer, or phosphorescent layer compare with the device that has only the phosphorescence luminescent layer separately when covering blue light fluorescence radiation layer, efficient all can get a promotion, and chromaticity coordinates all can be consistent.
Why preferably between blue light fluorescence radiation layer and phosphorescent layer, add the barrier layer, be because:
The independent barrier layer of one deck is arranged between phosphorescent layer and blue light fluorescence coating, this barrier layer possesses high triplet, its triplet is higher than the triplet of fluorescence coating and phosphorescent layer, thereby the triplet energy state that has stoped the phosphorescent layer material is delivered on the blue light fluorescence coating, avoid the waste of triplet excitons energy, improved device efficiency.In addition, because the effect of HBL layer separately, recombination region can be positioned at the EML/HBL interface, so also can avoid exciton compound near HTL, thereby has further promoted device efficiency, and the stability of device is also had the improvement effect.Moreover the balance of charge carrier can be regulated by barrier layer thickness, can also regulate by the size of barrier material carrier mobility, so charge carrier is more prone to balance, also makes the efficient of device get a promotion.
Comparative Examples 2 and embodiment 2
Comparative Examples 2-1, and the preparation process of embodiment 2-1 to 2-4 is identical with the preparation process of embodiment 1-2, except changing gold-tinted layer double source evaporation into three source evaporations.
Embodiment 2-1 to 2-4, its mechanism and implementation result and embodiment 1-1 to 1-5, basically identical.
Can illustrate that by Comparative Examples 2 and embodiment 2 the technical program is not only applicable to single main body device, also be applicable to two main body devices.
The device architecture of table 2-1 Comparative Examples 2 and embodiment 2
The device performance of table 2-2 Comparative Examples 2 and embodiment 2
Comparative Examples 3 and embodiment 3
Comparative Examples 3-1, and the preparation process of embodiment 3-1 to 3-3 is identical with the preparation process of embodiment 1-2, except changing the gold-tinted layer material into the green glow layer material.
Embodiment 3-1 to 3-3, its mechanism and implementation result and embodiment 1-1 to 1-5, basically identical.
Can illustrate that by Comparative Examples 3 and embodiment 3 the technical program is not only applicable to yellow device, also be applicable to other color, as green device.
The device architecture of table 3-1 Comparative Examples 3 and embodiment 3
The device performance of table 3-2 Comparative Examples 3 and embodiment 3
Comparative Examples 4 and embodiment 4
Comparative Examples 4-1, and the preparation process of embodiment 4-1 to 4-3 is identical with the preparation process of embodiment 1-2, except changing the gold-tinted layer material into the ruddiness layer material.
Embodiment 4-1 to 4-3, its mechanism and implementation result and embodiment 1-1 to 1-5, basically identical.
Can illustrate that by Comparative Examples 4 and embodiment 4 the technical program is not only applicable to yellow, green device, is applicable to other color yet, as the ruddiness device.
The device architecture of table 4-1 Comparative Examples 4 and embodiment 4
The device performance of table 4-2 Comparative Examples 4 and embodiment 4
Comparative Examples 5 and embodiment 5
Comparative Examples 5-1, and the preparation process of embodiment 5-1 to 5-3 is identical with the preparation process of embodiment 1-2, except the gold-tinted layer is changed into the structure of green glow sensitization ruddiness by single gold-tinted dyestuff.
Embodiment 5-1 to 5-3, its mechanism and implementation result and embodiment 1-1 to 1-5, basically identical.
Can illustrate that by Comparative Examples 5 and embodiment 5 the technical program is not only applicable to the monochrome devices of homogencous dyes structures such as yellow, green, redness, also be applicable to the device of sensitization structure.
The device architecture of table 5-1 Comparative Examples 5 and embodiment 5
The device performance of table 5-2 Comparative Examples 5 and embodiment 5
Be directed to the concrete Comparative Examples and the embodiment of top-illuminating OLED
In the described top illuminating device structure, the feature of reflection anode is reflectivity＞90%, serves as preferred with reflectivity＞95%.Material therefor comprises silver (Ag) and alloy, aluminium (Al) and alloy thereof, for example silver (Ag), silver and the alloy (Al:Nd) of plumbous alloy (Ag:Pb), aluminium and neodymium, the alloy (Ag:Pt:Cu) of silver-colored platinoid etc.When using Ag and alloy thereof, between reflector and substrate, can comprise one deck ITO as the reflector.
In the described top illuminating device structure, the light transmittance of negative electrode is at 30%-90%, preferred 50%-80%.Under the condition of this light transmittance, can either realize optical resonator, the emergent light efficient that can obtain again.Used material be in all band scope extinction coefficient less than 4.5 metal, within the blue wave band scope, preferably extinction coefficient is less than 2.75, within the green light band scope preferably extinction coefficient less than 3.5, within the red spectral band scope preferably extinction coefficient less than 4.2.Satisfy the material of above-mentioned extinction coefficient, can avoid launching light by the time loss.Select for use on the negative electrode of above-mentioned material to comprise one deck antireflection layer, its refractive index＞1.6, the material of preferred index＞1.8 is emphasized to strengthen transmitted light, and is regulated spectrum.
The device architecture of table 6-1 Comparative Examples 6 and embodiment 6
The device performance of table 6-2 Comparative Examples 6 and embodiment 6
| Brightness (cd/m2) | Voltage (V) | Current efficiency (cd/A) | Chromaticity coordinates (x, y) | |
| Comparative Examples 6 | 1000 | 3.56 | 13.7 | (0.66，0.33) |
| Embodiment 6 | 1000 | 3.6 | 15.6 | (0.66，0.33) |
Comparative Examples 6 and embodiment 6 explanations, the technical program is applicable to ruddiness top ray structure, and efficient is improved, colourity can remain unchanged.
The device architecture of table 7-1 Comparative Examples 7 and embodiment 7
The device performance of table 7-2 Comparative Examples 7 and embodiment 7
| Brightness (cd/m2) | Voltage (V) | Current efficiency (cd/A) | Chromaticity coordinates (x, y) | |
| Comparative Examples 7 | 1000 | 3.24 | 74 | (0.29，0.67) |
| Embodiment 7 | 1000 | 3.15 | 82 | (0.27，0.71) |
Comparative Examples 7 and embodiment 7 explanations, the technical program is applicable to green glow top ray structure, and efficient is improved, and it is purer that colourity can be regulated, this prepares organic electroluminescent LED (AMOLED) for the top ray structure, can improve colour gamut, the color that makes whole AMOLED display screen show is purer.
The device architecture of table 8-1 Comparative Examples 8 and embodiment 8-9
The device performance of table 8-2 Comparative Examples 8 and embodiment 8-9
| Brightness (cd/m2) | Voltage (V) | Current efficiency (cd/A) | Chromaticity coordinates (x, y) | |
| Comparative Examples 8 | 1000 | 3.05 | 65 | (0.52，0.47) |
| Embodiment 8 | 1000 | 3.1 | 14 | (0.65，0.33) |
| Embodiment 9 | 1000 | 3.12 | 71 | (0.30，0.67) |
Comparative Examples 8 and embodiment 8 explanations, the technical program is applicable to the top ray structure of green glow sensitization ruddiness, and the crest of ruddiness is not only arranged in the spectrum of device, the crest that also has green glow, when regulating light path, can use this structure, obtain simple ruddiness or green glow respectively.This can increase aperture opening ratio during for preparation top ray structure color screen, simplifies technology, saves cost.
Above Comparative Examples and embodiment are the execution mode that the present invention can take.
Describe a kind of preparation technology of organic electroluminescence device of the present invention below in conjunction with Fig. 4,, only show the evaporation schematic diagram that carries out ruddiness, green glow and blue light-emitting among the figure for clear.This preparation technology comprises step.
1) on substrate 01, prepares ito thin film;
2) etching ito anode figure;
3) the last preparation of ITO insulating barrier forms a plurality of light emitting pixels, and three sub-pixs of red, green, blue are arranged in each pixel;
4) aforesaid substrate is sent to the plasma treatment chamber of evaporated device, carries out plasma treatment;
5) with aforesaid substrate, load onto open mask and be sent to first organic chamber, carry out the evaporation of HIL layer;
6) with aforesaid substrate, load onto open mask and be sent to second organic chamber, carry out the evaporation of htl layer;
7) with aforesaid substrate, load onto precision mask 101, be sent to the 3rd organic chamber, carry out accurate contraposition then, the openwork part of precision mask 101 has just in time been covered the red sub-pixel part of substrate, carry out the red light luminescent layer evaporation then;
8) with aforesaid substrate, load onto precision mask 102, be sent to having ideals, morality, culture, and discipline machine chamber, carry out accurate contraposition then, the openwork part of precision mask 102 has just in time been covered the green sub-pix part of substrate, carry out green luminescence layer evaporation then;
With 9) with aforesaid substrate, load onto open mask 103, be sent to the 5th organic chamber, carry out the evaporation of blue light-emitting, the evaporation of this layer does not need precision mask;
10) with aforesaid substrate, load onto open mask and be sent to the 6th organic chamber, carry out the evaporation of ETL layer;
11) with aforesaid substrate, load onto the open mask of electrode and be sent to electrode chambers, carry out the evaporation of negative electrode;
12) substrate that above-mentioned evaporation is finished is sent to glove box, encapsulates.
Through after the above-mentioned steps, finished preparation process according to a kind of organic electroluminescence device of the present invention.
When organic electroluminescence device has the barrier layer, can be in above-mentioned steps 7) and 8) in carry out the evaporation on barrier layer.
Claims (20)
1. color organic electroluminescence device comprises:
Substrate;
First electrode;
Second electrode; With
Be arranged at the organic function layer between this first and second electrode, this organic function layer comprises three kinds of sub-pix organic functionses of red, green, blue district at least, and wherein at least a sub-pix organic functions district comprises:
The phosphorescence luminescent layer, this phosphorescence luminescent layer is non-blue light-emitting; With
Blue light-emitting,
Wherein, this blue light-emitting covers this phosphorescence luminescent layer.
2. color organic electroluminescence device as claimed in claim 1, wherein, described phosphorescence luminescent layer comprises red light luminescent layer or green luminescence layer.
3. color organic electroluminescence device as claimed in claim 1, wherein, described blue light-emitting comprises blue light fluorescence radiation layer.
4. as each described color organic electroluminescence device among the claim 1-3, wherein, described organic electroluminescence device is the luminous organic electroluminescence device in the end.
5. color organic electroluminescence device as claimed in claim 4, wherein, described first electrode is an anode, described second electrode is a negative electrode.
6. color organic electroluminescence device as claimed in claim 5, wherein, described at least a sub-pix organic functions district comprises:
Hole injection layer/hole transmission layer/phosphorescence luminescent layer/blue light fluorescence coating/electron transfer layer and/or electron injecting layer.
7. color organic electroluminescence device as claimed in claim 5, wherein, described at least a sub-pix organic functions district comprises:
Hole injection layer/hole transmission layer/blue light fluorescence coating/phosphorescence luminescent layer/electron transfer layer and/or electron injecting layer.
8. as each described color organic electroluminescence device among the claim 1-3, wherein, this organic electroluminescence device is the luminous organic electroluminescence device in top.
9. color organic electroluminescence device as claimed in claim 8, wherein, described first electrode is a reflection anode, described second electrode is the transmission negative electrode.
10. color organic electroluminescence device as claimed in claim 9, wherein, described at least a sub-pix organic functions district comprises:
Hole injection layer/hole transmission layer/phosphorescence luminescent layer/blue light fluorescence radiation layer/electron transfer layer and/or electron injecting layer.
11. color organic electroluminescence device as claimed in claim 9, wherein, the organic functions district of described at least a sub-pix comprises:
Hole injection layer/hole transmission layer/blue light fluorescence radiation layer/phosphorescence luminescent layer/electron transfer layer and/or electron injecting layer.
12., wherein, have the barrier layer between described blue light fluorescence radiation layer and the phosphorescence luminescent layer as each described color organic electroluminescence device in the claim 6,7,10 and 11.
13. color organic electroluminescence device as claimed in claim 12, wherein, the triplet of the material on described barrier layer is more than or equal to the triplet of the material of described phosphorescence luminescent layer.
14. color organic electroluminescence device as claimed in claim 12, wherein, the material on described barrier layer is electronic property or hole character.
15. color organic electroluminescence device as claimed in claim 1, wherein, the character of described blue light-emitting is electronic property or hole character.
16. a method for preparing color organic electroluminescence device comprises step at least:
A) on substrate, prepare anode layer;
B) on anode layer, prepare insulating barrier, form a plurality of light emitting pixels, comprise phosphorescence sub-pix and blue light sub-pix in each pixel;
C) aforesaid substrate is sent to the plasma treatment chamber of evaporated device, carries out plasma treatment;
D), load onto the first open mask and carry out the preparation of hole injection layer with aforesaid substrate;
E), load onto the second open mask and carry out the preparation of hole transmission layer with aforesaid substrate;
F) utilize precision mask partly to carry out the preparation of phosphorescence luminescent layer at the phosphorescence sub-pix, and utilize the 3rd open mask to be prepared blue light-emitting, this blue light-emitting covers phosphorescence sub-pix and blue light sub-pix;
G), load onto the 4th open mask and carry out the preparation of electron transfer layer with aforesaid substrate;
H), load onto the 5th open mask and carry out the preparation of negative electrode with aforesaid substrate;
I) encapsulation.
17. method as claimed in claim 16, wherein, described phosphorescence sub-pix comprises ruddiness sub-pix and green glow sub-pix.
18. method as claimed in claim 17 wherein, utilizes first precision mask to prepare red light luminescent layer, the corresponding ruddiness sub-pix of the openwork part of this first precision mask; Utilize second precision mask to prepare the green luminescence layer, the corresponding green glow sub-pix of the openwork part of this second precision mask.
19., also be included in the step on preparation barrier layer between phosphorescence luminescent layer and the blue light-emitting as each described method in the claim 16 to 18.
20. method as claimed in claim 19, wherein, the triplet of the material on barrier layer is more than or equal to the triplet of the material of described phosphorescence luminescent layer.
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