CN104600094B - A kind of Organnic electroluminescent device with four color sub-pixs - Google Patents
A kind of Organnic electroluminescent device with four color sub-pixs Download PDFInfo
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Abstract
The present invention relates to a kind of Organnic electroluminescent device with four color sub-pixs, a part for the deep blue light-emitting is physically contacted with first organic function layer, and another part formation is in the top of the red light luminescent layer, green light emitting layer and shallow blue light-emitting；Exciton barrier-layer is provided between the feux rouges, green glow and light blue light and the dark blue light, the exciton barrier-layer includes the first barrier material and the second barrier material with cavity transmission ability, T1 >=2.6eV, HOMO energy level≤5.6eV of first barrier material；The second barrier material HOMO energy levels≤5.4eV, hole mobility >=5 × 10‑4cm/Vs.Organnic electroluminescent device preparation technology with four color sub-pixs is simple, and with higher luminous efficiency and relatively low power consumption.
Description
Technical field
The present invention relates to Organnic electroluminescent device technical field, particularly a kind of organic electroluminescence with four color sub-pixs
Light-emitting device.
Background technology
The usual of Organnic electroluminescent device OLED is made up of three kinds of pixels of red, green, blue, because the material of phosphorescence system can
It is luminescent layer common used material to realize higher luminous efficiency.Current red light luminescent layer and green light emitting layer mainly use full phosphorus
Luminescent material, the full phosphor material that light blue luminescent layer is used is also more ripe.But it is currently used as the phosphorus of navy blue luminescent material
Luminescent material is low (only 25%) due to short life and efficiency, therefore navy blue luminescent material often uses fluorescent material.Full fluorescent material
Colourity and the life-span although have a stronger advantage, but the structure being used in mixed way with full phosphor layer, efficiency is relatively low.
CN201080065975 discloses a kind of novel OLED device, and the luminescent layer of the device has four sub-pixels, point
Wei not red phosphorescent sub-pixel, green phosphorescent sub-pixel, light blue phosphor sub-pixels and navy blue fluorescence sub-pixel.With existing skill
The OLED of tri- sub-pixels of RGB of art is compared, and adds light blue phosphor sub-pixels, can make its color more horn of plenty,
With higher luminous efficiency, the power consumption of display screen is reduced.But the luminescent layer of four sub-pixels is steamed using juxtaposition is made
Four groups of accurate mask plates are needed to use during plating, each sub-pixel is required for exactitude position, therefore adds technology difficulty and manufacture
Cost, mistake probability increase during accurate mask plate contraposition, yields reduction.
To solve the contraposition number of times of accurate mask plate, US20100244069 puts forward using while two sub-pixs are deposited
The method that the mode of luminescent layer makes four color display devices, i.e., be deposited white light simultaneously when using the luminescent layer of evaporation R/G/B pixels
Pixel light emission layer, its evaporation mode is：The red light luminescent layer of red pixel and the red light emitting layer of white light pixel is deposited, in evaporation
The green light emitting layer of green pixel and the green light emitting layer of white light pixel, be then deposited again the blue light-emitting of blue pixel with it is white
The blue light-emitting layer of light pixel, the evaporation order of certain RGB luminescent layer can be adjusted.But the program can only realize the 4th picture
Element is white light.If its white light pixel is replaced with into dark blue light pixel, it still needs 4 groups of accurate mask plates and four contrapositions are
Evaporation can be realized.
CN2013103644792 discloses a kind of oganic light-emitting display device shown in Fig. 2, and the organic light emitting display is set
It is standby to include：Substrate；The multiple pixels limited in the substrate, pixel includes red sub-pixel, green sub-pixels, blue sub- picture
Element and white sub-pixels, the pixel also include：Form anode on the substrate；The negative electrode relative with the anode；Across
Each red formed crossed in red sub-pixel area, green sub-pixels area, blue subpixels area and white sub-pixels area is public
Common luminescent layer 146, green common light layer 144 and blue common light layer 142, wherein, the blue common light layer is by cloth
Put above the anode and adjacent with the anode, the green common light layer is disposed in the blue common light
Layer top, and red common light layer be disposed in the green common light layer top and with the negative electrode phase
Neighbour, wherein, it is stacked on the red common light layer, the green common light layer and the indigo plant in the white sub-pixels
Color common light layer sends feux rouges, green glow and blue light so that export white light from the white sub-pixels.The three of each pixel region
Hole transmission layer or electron transfer layer are set between layer emission layer, and the display device structure is complicated, and preparation technology needs cumbersome.It is right
In preparing the high OLED of precision, complex process means that mistake probability increases, yields reduction.
The content of the invention
Therefore, the technical problems to be solved by the invention are the phosphorescence for having in four color sub-pix devices in the prior art
Triplet mismatch easily occurs between luminescent layer and fluorescent light-emitting layer causes the problem of luminous efficiency is low, and then provides
A kind of Organnic electroluminescent device with four color sub-pixs, it has higher luminous efficiency and relatively low power consumption.
In order to solve the above technical problems, the present invention is adopted the following technical scheme that：
A kind of Organnic electroluminescent device with four color sub-pixs, including substrate, set first on the substrate
Electrode layer, organic function layer and the second electrode lay, the organic function layer include first be sequentially formed in first electrode layer
Organic function layer, luminescent layer and the second organic function layer, the luminescent layer include red light luminescent layer, green light emitting layer, light blue light
Luminescent layer and deep blue light-emitting, a part for the deep blue light-emitting are physically contacted with first organic function layer, separately
A part is formed in the top of the red light luminescent layer, green light emitting layer and shallow blue light-emitting；
It is provided between the red light luminescent layer, green light emitting layer and shallow blue light-emitting and the deep blue light-emitting sharp
Sub- barrier layer, the exciton barrier-layer includes the first barrier material and the second barrier material with cavity transmission ability, described
T1 >=2.6eV, the HOMO energy levels≤- 5.6eV of first barrier material；The second barrier material HOMO energy levels≤- 5.4eV, sky
Cave mobility >=5 × 10-4cm/Vs。
Preferably, HOMO energy level differences >=0.2eV of first barrier material and the second barrier material.
It is further preferred that first barrier material and the second barrier material mass ratio stated is 3: 7-7: 3.
The thickness of the exciton barrier-layer is 3nm-10nm.
First barrier material is Bphen (4,7- diphenyl -1,10- phenanthroline) or BCP (Bathocuproine).
Second barrier material is formula (1), formula (2), formula (3), formula (4) or structure shown in formula (5)：
Wherein, the A and B are respectively and independently selected from phenyl, naphthyl or anilino-；
R1、R2、R3、R4、R5、R6、R7、R8、R15、R16、R17And R18It is identical or different, it is respectively and independently selected from protium, halogen family
Element, CN, NO2, amino, C6-C30Sub- fused ring aryl, C6-C30Sub- condensed hetero ring aryl, C6-C20Alkyl or C6-C30Alcohol
Base；
R9、R10、R11And R12It is identical or different, it is respectively and independently selected from C6-C30Aryl；
R13For C1-C6Alkyl or hydroxyl.
Preferably, second barrier material is formula (HTL2-1)-structure shown in (HTL2-23)：
The red light luminescent layer, green light emitting layer, shallow blue light-emitting are phosphorescence luminescent layer, the deep blue light-emitting
For fluorescent light-emitting layer.
Some pixel confining layers are provided with the substrate, the pixel confining layers form continuous network, filled
Organic function layer in the network constitutes feux rouges sub-pix, and green glow sub-pix, light blue smooth sub-pix or dark blue light are sub-
Pixel.
First organic function layer includes hole injection layer and/or hole transmission layer (3), and second organic function layer is electricity
Sub- transport layer and/or electron injecting layer.
A kind of preparation method of Organnic electroluminescent device, comprises the steps：
S1, make pixel confining layers on substrate, it is graphical after using aperture mask plate be deposited successively first electrode layer and
First organic function layer；
S2, red light luminescent layer, green light emitting layer and light blue luminescent layer be deposited using accurate mask plate；
S3, exciton blocking prepared above red light luminescent layer, green light emitting layer and light blue luminescent layer using aperture mask plate
The deep blue light-emitting of layer, evaporation makes a part for deep blue light-emitting be formed in the physical contact of the first organic function layer, another portion
Point formed above the exciton barrier-layer, the second organic function layer and the second electrode lay.
The above-mentioned technical proposal of the present invention has advantages below compared with prior art：
(1) Organnic electroluminescent device that the present invention is provided includes feux rouges sub-pix, green glow sub-pix, light blue smooth sub-pix
With dark blue smooth four kinds of colors of sub-pix, dark blue light covers red, green, light blue luminescent layer simultaneously, and red, green, light blue luminescent layer is phosphorus
Light luminescent layer, dark blue gloss fluorescent light-emitting layer uses exciton barrier-layer between phosphorescence luminescent layer and fluorescent light-emitting layer, described
Exciton barrier-layer uses the first barrier material doped with the second barrier material of cavity transmission ability, first barrier material
T1 >=2.6eV, HOMO energy levels≤- 5.6eV；The second barrier material HOMO energy levels≤- 5.4eV, hole mobility >=5 ×
10-4Cm/Vs, the exciton barrier-layer that both combinations of materials are constituted is not only able to improve the distribution of electric charge, and is effectively stopping
While exciton transfer, it is ensured that hole is effectively transferred in deep blue light-emitting, the luminous effect of el light emitting device is improved
Rate, the power consumption of low display screen.
(2) four color sub-pixs of Organnic electroluminescent device of the present invention only have red light luminescent layer, green glow in preparation process
Luminescent layer, shallow blue light-emitting need to use three groups of accurate mask plates, and aperture mask plate is used when prepared by deep blue light-emitting.
The dark blue smooth sub-pix with high-accuracy mask plate equal resolution can be made using the aperture mask plate, or is covered using high-accuracy
Diaphragm plate makes the display device that resolution ratio is higher by many times.Accurate mask plate cost and its costliness, often reduce by one group of accurate mask plate,
Preparation cost can be greatly lowered.In addition, if four sub-pixs are using four contrapositions, contraposition every time can all have certain mistake
Difference.Therefore contraposition number of times is fewer, and error is fewer, and product yield is just high, and the present invention only needs to red green shallow blue light-emitting
Contraposition, without especially aligning when prepared by deep blue light-emitting, therefore reduces the generation of error to a certain extent.With background skill
Art is compared, it is possible to reduce one group of accurate mask plate, also reduces once the contraposition of accurate mask plate, therefore be conducive to improving finished product
Rate.
(3) when each luminescent layer meets certain relationship between energy levels, it can cause dark blue in red, green, light blue sub-pix
Light luminescent layer does not light, and still obtains feux rouges, green glow and light blue light.
Brief description of the drawings
In order that present disclosure is easier to be clearly understood, specific embodiment and combination below according to the present invention
Accompanying drawing, the present invention is further detailed explanation, wherein
Fig. 1 is emitting device structure schematic diagram of the invention；
Fig. 2 is prior art construction schematic diagram；
The deep blue light-emitting of 1- substrates, 2- first electrode layers, 3- hole transmission layers, 4- exciton barrier-layers, 5-, 6- electronics are passed
Defeated layer, 7- the second electrode lays, 8- red light luminescent layers, 9- green light emitting layers, the shallow blue light-emittings of 10-, 11- pixel confining layers.
Embodiment
In order that the object, technical solutions and advantages of the present invention are clearer, below in conjunction with reality of the accompanying drawing to the present invention
The mode of applying is described in further detail.
The present invention can be embodied in many different forms, and should not be construed as limited to embodiment set forth herein.
Opposite there is provided these embodiments so that the disclosure will be thorough and complete, and the design of the present invention will be fully conveyed to
Those skilled in the art, the present invention will only be defined by the appended claims.In the accompanying drawings, for clarity, Ceng He areas can be exaggerated
The size and relative size in domain.It should be appreciated that when element such as layer, region or substrate are referred to as " formation " or " set
Gone up at " another element " " when, the element can be arranged directly on another element, or can also have intermediary element.
On the contrary, when element is referred to as on " being formed directly into " or " being set directly at " another element, in the absence of intermediary element.
As shown in figure 1, Organnic electroluminescent device of the present invention includes substrate 1, the first electrode on the substrate 1 is arranged on
Layer 2, organic function layer and the second electrode lay 7, what the organic function layer included sequentially forming on the first electrode layer 2 first has
Machine functional layer, luminescent layer and the second organic function layer, the luminescent layer include red light luminescent layer 8, green light emitting layer 9, light blue light
Luminescent layer 10 and deep blue light-emitting (5), a part and the first organic function layer physics of the deep blue light-emitting 5 connect
Touch, another part formation is in the top of the red light luminescent layer 8, green light emitting layer 9 and shallow blue light-emitting 10；
Set between the red light luminescent layer 8, green light emitting layer 9 and shallow blue light-emitting 10 and the deep blue light-emitting 5
Exciton barrier-layer 4 is equipped with, the exciton barrier-layer 4 includes the first barrier material and the second stop material with cavity transmission ability
Material, T1 >=2.6eV, the HOMO energy levels≤- 5.6eV of first barrier material；The second barrier material HOMO energy levels≤-
5.4eV, hole mobility >=5 × 10-4cm/Vs。
HOMO energy level differences >=0.2eV of first barrier material and the second barrier material.
First barrier material and the second barrier material mass ratio stated is 3: 7-7: 3.
The thickness of the exciton barrier-layer 4 is 3nm-10nm.
First barrier material is Bphen, BCP.
Second barrier material is formula (1), formula (2), formula (3), formula (4) or structure shown in formula (5)：
Wherein, the A and B are respectively and independently selected from phenyl, naphthyl or anilino-；
R1、R2、R3、R4、R5、R6、R7、R8、R15、R16、R17And R18It is identical or different, it is respectively and independently selected from protium, halogen family
Element, CN, NO2, amino, C6-C30Sub- fused ring aryl, C6-C30Sub- condensed hetero ring aryl, C6-C20Alkyl or C6-C30Alcohol
Base；
R9、R10、R11And R12It is identical or different, it is respectively and independently selected from C6-C30Aryl；
R13For C1-C6Alkyl or hydroxyl.
The second barrier material is stated for formula (HTL2-1)-structure shown in (HTL2-23)：
The red light luminescent layer red light luminescent layer 8, green light emitting layer 9, shallow blue light-emitting 10 are phosphorescence luminescent layer, institute
Deep blue light-emitting 5 is stated for fluorescent light-emitting layer.
Some pixel confining layers 11 are provided with the substrate 1, the pixel confining layers 11 form continuous network,
The organic function layer being filled in the network constitutes feux rouges sub-pix, green glow sub-pix, light blue smooth sub-pix or dark blue
Light sub-pix.
First organic function layer includes hole injection layer and/or hole transmission layer 3, and second organic function layer is electronics
Transport layer 6 and/or electron injecting layer.
The preparation method of above-mentioned Organnic electroluminescent device, comprises the steps：
S1, on substrate 1 making pixel confining layers 11, it is graphically rear that first electrode layer is deposited using aperture mask plate successively
2 and first organic function layer；
S2, red light luminescent layer 8, green light emitting layer 9 and light blue luminescent layer 10 be deposited using accurate mask plate；
S3, the preparation preparation above red light luminescent layer 8, green light emitting layer 9 and light blue luminescent layer 10 using aperture mask plate
The deep blue light-emitting 5 of exciton barrier-layer 4, evaporation makes a part for deep blue light-emitting 5 be formed in the first organic function layer physics
Contact, another part formation is in the top of exciton barrier-layer 4, the second organic function layer and the second electrode lay 7.
The structure of the Organnic electroluminescent device of four color sub-pixs is：
Wherein HTL1 is the first barrier material, and HTL2 is the second barrier material.
Embodiment 1-6, its structure be the same as Example 1, the composition of wherein exciton barrier-layer 4 is as follows.
| HTL1 structural formulas | HTL1 accountings (wt%) | HTL2 structural formulas | HTL2 accountings (wt%) | |
| Embodiment 1 | Bphen | 30 | HTL2-1 | 70 |
| Embodiment 2 | BCP | 70 | HTL2-7 | 30 |
| Embodiment 3 | Bphen | 65 | HTL2-8 | 35 |
| Embodiment 4 | Bphen | 45 | HTL2-19 | 55 |
| Embodiment 5 | BCP | 65 | HTL2-20 | 35 |
| Embodiment 6 | BCP | 24 | HTL2-23 | 76 |
Obviously, above-described embodiment is only intended to clearly illustrate example, and the not restriction to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of change or
Change.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change thus extended out or
Among changing still in the protection domain of the invention.
Claims (12)
1. a kind of Organnic electroluminescent device with four color sub-pixs, including substrate (1), are arranged on the substrate (1)
First electrode layer (2), organic function layer and the second electrode lay (7), the organic function layer include being sequentially formed at first electrode
The first organic function layer, luminescent layer and the second organic function layer on layer (2), the luminescent layer include red light luminescent layer (8), green
Light luminescent layer (9), shallow blue light-emitting (10) and deep blue light-emitting (5), it is characterised in that：
A part for the deep blue light-emitting (5) is physically contacted with first organic function layer, and another part formation is in institute
State the top of red light luminescent layer (8), green light emitting layer (9) and shallow blue light-emitting (10).
2. the Organnic electroluminescent device with four color sub-pixs according to claim 1, it is characterised in that the feux rouges
Exciton is provided between luminescent layer (8), green light emitting layer (9) and shallow blue light-emitting (10) and the deep blue light-emitting (5)
Barrier layer (4), the exciton barrier-layer (4) includes the first barrier material and the second barrier material with cavity transmission ability,
T1 >=2.6eV, the HOMO energy levels≤- 5.6eV of first barrier material；The second barrier material HOMO energy levels≤-
5.4eV, hole mobility >=5 × 10-4cm/Vs。
3. there is the Organnic electroluminescent device of four color sub-pixs according to claim 2, it is characterised in that first resistance
HOMO energy level differences >=0.2eV of obstructing material and the second barrier material.
4. there is the Organnic electroluminescent device of four color sub-pixs according to claim 2, it is characterised in that first resistance
Obstructing material and the second barrier material mass ratio are 3: 7-7: 3.
5. there is the Organnic electroluminescent device of four color sub-pixs according to claim 2, it is characterised in that the exciton resistance
The thickness of barrier (4) is 3nm-10nm.
6. there is the Organnic electroluminescent device of four color sub-pixs according to claim 2-5 is any, it is characterised in that：It is described
First barrier material is Bphen or BCP.
7. there is the Organnic electroluminescent device of four color sub-pixs according to claim 2-5 is any, it is characterised in that：It is described
Second barrier material is formula (1), formula (2), formula (3), formula (4) or structure shown in formula (5)：
Wherein, the A and B are respectively and independently selected from phenyl, naphthyl or anilino-；
R1、R2、R3、R4、R5、R6、R7、R8、R15、R16、R17And R18It is identical or different, be respectively and independently selected from protium, halogen,
CN、NO2, amino, C6-C30Sub- fused ring aryl, C6-C30Sub- condensed hetero ring aryl, C6-C20Alkyl or C6-C30Alcohol radical；
R9、R10、R11And R12It is identical or different, it is respectively and independently selected from C6-C30Aryl；
R13Selected from C1-C6Alkyl or hydroxyl.
8. there is the Organnic electroluminescent device of four color sub-pixs according to claim 6, it is characterised in that：Second resistance
Obstructing material is formula (HTL2-1)-structure shown in (HTL2-23)：
9. there is the Organnic electroluminescent device of four color sub-pixs according to claim 1 is any, it is characterised in that：It is described red
Light luminescent layer (8), green light emitting layer (9), shallow blue light-emitting (10) are phosphorescence luminescent layer, the deep blue light-emitting (5)
For fluorescent light-emitting layer.
10. there is the Organnic electroluminescent device of four color sub-pixs according to claim 1, it is characterised in that：The substrate
(1) some pixel confining layers (11) are provided with, the pixel confining layers (11) form continuous network, be filled in described
Organic function layer in network constitutes feux rouges sub-pix, green glow sub-pix, light blue smooth sub-pix or dark blue smooth sub-pix.
11. there is the Organnic electroluminescent device of four color sub-pixs according to claim 1 is any, it is characterised in that：First
Organic function layer includes hole injection layer and/or hole transmission layer (3), and second organic function layer is electron transfer layer (6)
And/or electron injecting layer.
12. a kind of preparation method of the Organnic electroluminescent device with four color sub-pixs, it is characterised in that including following steps
Suddenly：
S1, the making pixel confining layers (11) on substrate (1), it is graphically rear that first electrode layer is deposited using aperture mask plate successively
And the first organic function layer (2)；
S2, red light luminescent layer (8), green light emitting layer (9) and light blue luminescent layer (10) be deposited using accurate mask plate；
S3, prepared and swashed above red light luminescent layer (8), green light emitting layer (9) and light blue luminescent layer (10) using aperture mask plate
Sub- barrier layer (4), the deep blue light-emitting (5) of evaporation makes a part for deep blue light-emitting (5) be formed in the first organic function layer
Physical contact, another part formation is in the exciton barrier-layer (4) top, the second organic function layer and the second electrode lay (7).
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| CN103904100A (en) * | 2012-12-27 | 2014-07-02 | 乐金显示有限公司 | Organic light emitting diode display device and method of fabricating the same |
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| CN102224591A (en) * | 2008-10-01 | 2011-10-19 | 通用显示公司 | Novel OLED display architecture |
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