CN108807459A - A kind of Organnic electroluminescent device and preparation method thereof - Google Patents
A kind of Organnic electroluminescent device and preparation method thereof Download PDFInfo
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- CN108807459A CN108807459A CN201710295724.7A CN201710295724A CN108807459A CN 108807459 A CN108807459 A CN 108807459A CN 201710295724 A CN201710295724 A CN 201710295724A CN 108807459 A CN108807459 A CN 108807459A
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
- H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2102/00—Constructional details relating to the organic devices covered by this subclass
- H10K2102/301—Details of OLEDs
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- H—ELECTRICITY
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Abstract
The present invention relates to display technology field, the Organnic electroluminescent device includes array, and the array includes multiple white organic LEDs；Each white organic LED includes the first electrode being stacked, organic luminous layer and second electrode；At least side of the first electrode is provided with the light path control layer for regulating and controlling light path, the ratio for regulating and controlling to correspond to wave band light in the white organic LED emergent ray.The wavelength of Organic Light Emitting Diode can be changed by adjusting optical thickness by light path control layer, light path control layer is arranged in at least side of the first electrode of white organic LED in Organnic electroluminescent device provided in an embodiment of the present invention, the ratio for being conducive to correspond to wave band light in the emergent ray to white organic LED regulates and controls, so that the white organic LED launches the light of actually required color, to effectively increase the luminous efficiency of the Organnic electroluminescent device.
Description
Technical field
The present invention relates to display technology fields, and in particular to a kind of Organnic electroluminescent device and preparation method thereof.
Background technology
Display of organic electroluminescence (full name in English Organic Light Emitting Display, abbreviation OLED) is
Active luminous display unit has many advantages, such as that high contrast, wide viewing angle, low-power consumption, volume are thinner, is expected to become next-generation mainstream
Flat panel display is most one of technology that attracts attention in current flat panel display.
Currently, OLED display technologies realize that the mode of colored display is broadly divided into three kinds, first, three primary colors (RGB) are independent
Pixel light emission, second is that color conversion shines, third, the white luminous mode combined with optical filter.Wherein, color conversion shines
Color display technology is limited by high-quality color converter development difficulty, is not used on a large scale；Three primary colors (RGB) are independent
Pixel light emission technology needs to use high-accuracy metal mask version (Fine Metal Mask, FMM), is limited to FMM sizes,
RGB independent pixel luminescence technologies can be only applied to small size display screen at present；In the white luminous mode combined with optical filter, hair
Photosphere only has white light-emitting diode, coats the trichromatic filter coatings of RGB on the top of white light-emitting diode, and then formed and regarded
Three primary colors in feel shine, and this mode technical difficulty and cost are relatively low, but light utilization efficiency is low, brightness, contrast and color
Three important display indexs are all relatively low.To solve the above problems, increasing white light pixel in the prior art, that is, use tetra- pictures of RGBW
It usually improves display effect and improves light utilization efficiency, but effect is still undesirable.
It shows luminous efficiency in conclusion how to improve the colored of OLED and ensures that display effect is that solution is badly in need of in this field
One of certainly the problem of.
Invention content
For this purpose, to be solved by this invention is how to improve the colored of OLED to show luminous efficiency and ensure display effect
The technical issues of.
In order to solve the above technical problems, the technical solution adopted by the present invention is as follows：
The present invention provides a kind of Organnic electroluminescent device, including array, the array includes the organic hair of multiple white lights
Optical diode；
Each white organic LED includes the first electrode being stacked, organic luminous layer and second electrode；
At least side of the first electrode is provided with the light path control layer for regulating and controlling light path, for regulating and controlling the white light
The ratio of wave band light is corresponded in Organic Light Emitting Diode emergent ray.
Optionally, the array includes several monochromatic sub-pixels of at least one color and several recombination photons pictures
Element；The light-emitting surface of each monochromatic sub-pixels is provided with optical filter.
Optionally, the monochromatic sub-pixels include at least one in feux rouges sub-pixel, green light sub-pixel, blue light sub-pixel
Kind；Each recombination photons pixel includes at least two sub-pixes, is mixed to form white light sub-pixel.
Optionally, the refractive index of the light path control layer is 1.4~2.3.
Optionally, the light path control layer thickness in the feux rouges sub-pixel is more than the light path control in the green light sub-pixel
The thickness of layer is more than the thickness of the light path control layer in the blue light sub-pixel.
Optionally, the thickness of the corresponding light path control layer of each sub-pix differs entirely.
Optionally, each sub-pix area equation.
The present invention also provides a kind of preparation methods of above-mentioned Organnic electroluminescent device, include the following steps：
Monochromatic light subpixel area and recombination photons pixel region are divided on substrate；
It is respectively formed optical filter in the monochromatic light subpixel area；
Form the first electrode of white organic LED；
Form light path control layer；
Form the organic luminous layer and second electrode of white organic LED.
Optionally, further include the steps that forming protective layer before forming light path control layer step.
Optionally, further include the steps that forming carrier functional layer, the carrier functional layer includes hole injection layer, sky
At least one of cave transport layer, electronic barrier layer, hole blocking layer, electron transfer layer, electron injecting layer.
The above technical solution of the present invention has the following advantages over the prior art：
1, Organnic electroluminescent device provided in an embodiment of the present invention, in the first electrode of white organic LED
At least light path control layer is arranged in side, since Organic Light Emitting Diode is layer structure, easily forms Fabry-Perot type microcavitys,
Its luminescent spectrum has following formula：
EoutGo out luminous intensity, EinDyestuff luminous intensity in a free state, L in organic layeriComplex centre distance is anti-
The distance of radio pole, L- optical thicknesses, RmFirst electrode reflectivity, RdSecond electrode reflectivity.
As shown from the above formula, the wave of Organic Light Emitting Diode can be changed by adjusting optical thickness L by light path control layer
It is long.Therefore, Organnic electroluminescent device provided in an embodiment of the present invention white organic LED first electrode extremely
Light path control layer is arranged in few side, is conducive to the ratio that wave band light is corresponded in the emergent ray to white organic LED
Regulated and controled, so that the white organic LED launches the light of actually required color, to effectively increase
The luminous efficiency of the Organnic electroluminescent device.
In addition, light path control layer is arranged in at least side of first electrode, including being arranged in the upside of first electrode
Or downside or upper and lower both sides are respectively provided with, when the Organnic electroluminescent device is top illuminating device, light path control layer can be arranged
The upside of first electrode；When the Organnic electroluminescent device is bottom luminescent device, light path control layer can be arranged in first electrode
Downside；When the Organnic electroluminescent device is dual emission device, light path control layer can be simultaneously arranged in first electrode
Any position between optical filter and reflecting electrode can also be arranged in upper and lower both sides, certainly, light path control layer.Therefore,
The application field of Organnic electroluminescent device provided in an embodiment of the present invention is wide, is suitable for a plurality of types of luminescent devices.
2, Organnic electroluminescent device provided in an embodiment of the present invention, in white organic LED array, including extremely
A kind of several monochromatic sub-pixels of few color and several recombination photons pixels, and be equipped in the light-emitting surface of monochromatic sub-pixels
Therefore optical filter in monochromatic light subpixel area, regulates and controls white organic LED emergent ray by light path control layer
In certain monochromatic wavelength correspondence ratio after, then filter out by optical filter the light of monochromatic sub-pixels corresponding wavelength, in turn
Launch the monochromatic light of efficient different colours；
In recombination photons pixel region, each Asia picture in white organic LED is regulated and controled by light path control layer respectively
In plain emergent ray after the ratio of particular light ray, it is mixed into recombined white light.Both it had solved and has been not easy to prepare efficient white-light emitting
The problem of diode component, also avoiding white light, recombined white light is this inefficient again by filtering out monochromatic light after colored filter
Mode.The luminous efficiency for increasing effectively white light sub-pixel, improves display effect.
3, Organnic electroluminescent device provided in an embodiment of the present invention, monochromatic sub-pixels include feux rouges sub-pixel, green light
At least one of sub-pixel, blue light sub-pixel, RGB are the three primary colours in color system, using in these three one kind or
The monochromatic sub-pixels of a variety of formation, are easy to overlapping and generate miscellaneous color, improve display performance and display effect；
In addition, recombination photons pixel is controlled in recombination photons pixel region by light path including at least 2 sub-pixes
Layer regulates and controls in each sub-pix respectively after the ratio of particular light ray, recombined white light is remixed into, in this way, effectively increasing white light
Utilization rate and whole luminous efficiency.
Wherein, white light sub-pixel area is more than each monochrome sub-pixels area, and white light is corresponded to reduce white light sub-pixel
The current density of Organic Light Emitting Diode, and then effectively increase device lifetime.
4, Organnic electroluminescent device provided in an embodiment of the present invention is realized full-color aobvious using the structure of white light plus optical filter
Show, it is simple in structure, process costs are low, product yield is high.
5, the preparation method of Organnic electroluminescent device provided in an embodiment of the present invention, without changing existing maturation process,
The improvement that device performance can be realized in light path control layer, technique letter need to be only set on the light-emitting surface of white organic LED
List, production cost are low, are suitble to industrial production application.
Description of the drawings
In order to make the content of the present invention more clearly understood, it below according to specific embodiments of the present invention and combines
Attached drawing, the present invention is described in further detail, wherein
Fig. 1 is the structural schematic diagram for the bottom light-emitting organic electroluminescent device that embodiment 1 provides；
Fig. 2 is the spectrogram that embodiment 1 provides；
Fig. 3 is the structural schematic diagram for the top light-emitting organic electroluminescent device that embodiment 2 provides；
Fig. 4 is the structural schematic diagram for the double-sided light emitting organic electroluminescence device that embodiment 3 provides；
Fig. 5 is the pixel arrangement structure schematic diagram of Organnic electroluminescent device provided in an embodiment of the present invention；
Reference numeral is expressed as in figure：101- first electrodes；102- organic luminous layers；103- second electrodes；2- light path controls
Preparative layer；3- monochrome sub-pixels；301- feux rouges pixels；302- green light pixels；303- blue light pixels；4- recombination photons pixels；
401- sub-pixes；501- Red lightscreening plates；502- green color filters；503- blue color filters；6- protective layers.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the reality of 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.
On the contrary, providing 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, the areas Ceng He can be exaggerated
The size and relative size in domain.
It should be understood that " structure is identical " described herein refers to that the device number of plies is identical, and function correspond to it is identical.
For example, each diode is made of first electrode, hole injection layer, luminescent layer, second electrode, so-called structure is identical, not
Be limited to material and/or thickness correspond to it is identical.
Embodiment 1
A kind of Organnic electroluminescent device is present embodiments provided, as shown in Figure 1, including white organic LED group
At array, array includes several monochromatic 3 regions of sub-pixels and several 4 regions of recombination photons pixel, wherein monochromatic photon
Pixel 3 includes feux rouges sub-pixel 301, green light sub-pixel 302 and blue light sub-pixel 303, and the light-emitting surface of each monochrome sub-pixels 3 is set
It is equipped with optical filter, i.e. the light-emitting surface of feux rouges sub-pixel 301 is equipped with the Red lightscreening plate 501 that can filter out feux rouges, green light sub-pixel
302 light-emitting surface is equipped with the green color filter 502 that can filter out green light, and the light-emitting surface of blue light sub-pixel 303 is equipped with and can filter out
The blue color filter 503 of blue light, each recombination photons pixel 4 include three sub-pixes 401 of RGB, are mixed to form white light picture
Element.
As the alternative embodiment of the present invention, monochromatic sub-pixels 3 include feux rouges sub-pixel 301, green light sub-pixel
302, at least one of blue light sub-pixel 303, or be one or more combinations in arbitrary monochromatic light pixels；It is each compound
Sub-pixels 4 include at least two sub-pixes 401, and the purpose of the present invention may be implemented, belong to the scope of protection of the present invention.
In the present embodiment, each white organic LED includes the first electrode 101 being stacked, organic luminous layer
102 and second electrode 103, first electrode 101 is ITO (indium tin oxide) transparent anode, and second electrode 103 is reflective cathode,
The downside of first electrode 101 is provided directly with the light path control layer 2 for regulating and controlling light path, for regulating and controlling two pole of white-light organic light-emitting
The ratio of wave band light is corresponded in pipe emergent ray, the downside of the light path control layer 2 in monochrome sub-pixels region further respectively has
Red lightscreening plate 501, green color filter 502 and blue color filter 503, each optical filter be provided on substrate (substrate is being schemed
In do not mark).
As the alternative embodiment of the present invention, light path control layer 2 can also be arranged optical filter and second electrode 103 it
Between any position, can be achieved the purpose of the present invention, belong to the scope of protection of the present invention.
Organnic electroluminescent device provided in an embodiment of the present invention is bottom luminescent device, since Organic Light Emitting Diode is layer
Shape structure, easily forms Fabry-Perot type microcavitys, and luminescent spectrum has following formula：
EoutGo out luminous intensity, EinDyestuff luminous intensity in a free state, L in organic layeriComplex centre distance is anti-
The distance of radio pole, L- optical thicknesses, RmFirst electrode reflectivity, RdSecond electrode reflectivity.
As shown from the above formula, the wave of Organic Light Emitting Diode can be changed by adjusting optical thickness L by light path control layer 2
It is long, therefore, first electrode 101 of the Organnic electroluminescent device provided in an embodiment of the present invention in white organic LED
Light path control layer 2 is arranged in downside, is conducive to the ratio that wave band light is corresponded in the emergent ray to white organic LED
Regulated and controled, so that the white organic LED launches the light of actually required color, to effectively increase
The luminous efficiency of the Organnic electroluminescent device.
Specifically, in 3 region of monochromatic sub-pixels, two pole of white-light organic light-emitting is regulated and controled by light path control layer 2 simultaneously
In pipe emergent ray after the correspondence ratio of feux rouges, green light, blue light wavelength, then pass through Red lightscreening plate 501, green color filter respectively
502 and blue color filter 503 filter out the light of 303 corresponding wavelength of feux rouges sub-pixel 301, green light sub-pixel 302 and blue light sub-pixel
Line, and then launch three kinds of monochromatic light of RGB from bottom device, realize full-color display, Organic Electricity provided in an embodiment of the present invention
Electroluminescent devices add the structure of optical filter to realize full-color display using white light, simple in structure, low in energy consumption, product yield is high.
In 4 region of recombination photons pixel, regulate and control the outgoing of white organic LED respectively by light path control layer 2
Recombined white light is remixed into after the ratio of particular light ray in each sub-pix 401 in light, is gone out from bottom emission, without logical
Cross the mode that white light is combined with optical filter so that the white-light emitting efficiency of recombination photons pixel greatly improves.The Organic Electricity as a result,
The mixed light being made of the monochromatic light and recombined white light of three kinds of colors of RGB that electroluminescent devices are launched, improves white light
Utilization rate, and effectively increase the luminous efficiency of Organnic electroluminescent device entirety, effectively strengthen display effect, improve
Display performance.
As an embodiment of the present invention, in the present embodiment, 2 thickness of light path control layer in feux rouges sub-pixel 301 is big
The thickness of light path control layer 2 in green light sub-pixel 302 is more than the thickness of the light path control layer 2 in blue light sub-pixel 303.Tool
Body, the thickness of the light path control layer 2 in feux rouges sub-pixel 301 is 170nm, the light path control layer 2 in green light sub-pixel 302
Thickness is 140nm, and the thickness of the light path control layer 2 in blue light sub-pixel 303 is 60nm.
As the alternative embodiment of the present invention, 2 thickness of light path control layer, green light sub-pixel in feux rouges sub-pixel 301
The thickness of light path control layer 2 in 302 and the thickness of the light path control layer 2 in blue light sub-pixel 303 are not all the same, can be real
The existing purpose of the present invention, belongs to the scope of protection of the present invention.
As an embodiment of the present invention, in the present embodiment, the light path control corresponding to three sub-pixes 401 of RGB
The thickness of layer 2 is respectively 170nm, 140nm, 60nm.
As the alternative embodiment of the present invention, the thickness phase of the light path control layer 2 corresponding to red blue two sub-pixes 401
Together, the difficulty of preparation process is so simplified.
As the alternative embodiment of the present invention, three sub-pixes of RGB, the 401 corresponding light in recombination photons pixel 4
The thickness of program-controlled preparative layer 2 is not all the same.
As an embodiment of the present invention, in the present embodiment, the area equation of each complex light sub-pix 401, when compound
The area of light sub-pix 401 is 1:1:When 1, white light sub-pixel is combined by partially red, partially green, partially blue three parts " pseudo- white light " respectively
It forms, spectrum is constituted as shown in Fig. 2, luminous efficiency is high, and illumination effect is good.
As the alternative embodiment of the present invention, when the area of complex light sub-pix 401 can be according to the hair of white light sub-pixel
Light situation carries out the adjustment of white balance, to ensure good illumination effect.
As an embodiment of the present invention, in the present embodiment, light path control layer 2 is made by transparent indium-tin-oxide (ITO)
Standby to form, the refractive index of light path control layer 2 is 1.8；As the alternative embodiment of the present invention, light path control layer 2 is by titanium dioxide
Silicon layer, silicon nitride layer, polyimide layer or the above material composite layer be prepared, the refractive index of light path control layer 2 is 1.4
Within the scope of~2.3.
In the present embodiment, the thickness of light path control layer 2 is within the scope of 0~350nm.
As an embodiment of the present invention, in the present embodiment, the structure of white organic LED is：
ITO(150nm)/HAT-CN(5nm)/NPB(30nm)/MADN(30nm):DAS-Ph (5%)/Bhpen (10nm):
Li (2%)/HAT-CN (10nm)/NPB (30nm)/CBP (30nm):Ir(ppy)3(15%):Ir(piq)3(0.5%)/LiF
(0.5nm)/Al(150nm)；
Wherein, 2 HAT-CN, 3,6,7,10,11- six cyano-Isosorbide-5-Nitrae, 5,8,9,12- six azepine benzophenanthrenes；
NPB is diphenyl-N, N'- (1- naphthalenes) -1,1'- biphenyl -4,4'- diamines；
MADN is bis- (naphthalene -2- bases) anthracenes of 2- methyl -9,10-；
CBP is 4,4'- bis- (9- carbazoles) biphenyl；
Bhpen structural formulas are 4,7- diphenyl -1,10- phenanthrolines；
DAS-Ph is 4,4'- [1,4- phenylenes two-(1E) -2,1- ethylene diyl] two [N, N- diphenyl aniline]；
Ir(ppy)3Iridium is closed for three (2- phenylpyridines)；
Ir(piq)3Iridium (III) is closed for three (1- phenyl-isoquinolin)；
Above-mentioned material is commercially available.
As the convertible embodiment of the present invention, mesh of the present invention may be implemented in arbitrary structures white organic LED
, belong to the scope of the present invention.
As an embodiment of the present invention, the pixel arrangement structure of the Organnic electroluminescent device in the present embodiment is as schemed
Shown in 5, that is, Organnic electroluminescent device includes the pixel unit of several array arrangements, and each pixel unit includes three monochromes
Sub-pixels 3 and a recombination photons pixel 4；Monochromatic sub-pixels 3 are feux rouges sub-pixel 301, green light sub-pixel 302, blue light
Sub-pixel 303, recombination photons pixel 4 are white light sub-pixel.
As the convertible embodiment of the present invention, include the picture of arbitrary monochrome sub-pixels 3 and arbitrary recombination photons pixel 4
Plain unit, and arbitrarily the purpose of the present invention may be implemented in arrangement combination between pixel unit, belongs to the protection model of the present invention
It encloses.
The present embodiment additionally provides the preparation method of above-mentioned Organnic electroluminescent device, includes the following steps：
S1：Monochromatic 3 region of sub-pixels and 4 region of recombination photons pixel are divided on substrate, wherein monochromatic sub-pixels
3 regions include feux rouges sub-pixel 301, green light sub-pixel 302 and blue light sub-pixel 303, and 4 region of recombination photons pixel includes three
Sub-pix 401.
As an embodiment of the present invention, the substrate in the present embodiment is that TFT drives backboard (not marked in figure).
S2：It is respectively formed optical filter in 3 region of monochromatic sub-pixels, the picture of the Organnic electroluminescent device in the present embodiment
Plain arrangement is as shown in figure 4, when monochromatic 3 region of sub-pixels includes red, green and blue pixel, i.e., in monochromatic photon picture
Plain 3 regions are respectively formed Red lightscreening plate 501, green color filter and blue color filter.
S3：In Red lightscreening plate 501, green color filter 502 and blue color filter 503 and 4 region of recombination photons pixel
Upper formation light path control layer 2 is formed on Red lightscreening plate 501, green color filter 502 and blue color filter 503 thick respectively
Different light path control layers 2 is spent, and 2 thickness of light path control layer in feux rouges sub-pixel 301 is more than the light in green light sub-pixel 302
The thickness of program-controlled preparative layer 2 is more than the thickness of the light path control layer 2 in blue light sub-pixel 303.
As an embodiment of the present invention, in the present embodiment, the thickness of the light path control layer 2 in feux rouges sub-pixel 301
For 170nm, the thickness of the light path control layer 2 in green light sub-pixel 302 is 140nm, the light path control layer in blue light sub-pixel 303
2 thickness is 60nm；The thickness of the light path control layer 2 corresponding to three sub-pixes 401 in recombination photons pixel 4 is respectively
170nm, 140nm, 60nm, in the present embodiment, light path control layer 2 is ITO layer, refractive index 1.8.
S4：The first electrode 101 that white organic LED is formed on light path control layer 2, in the present embodiment, first
Electrode 101 is ITO (indium tin oxide) transparent anode.
S5：The organic luminous layer 102 and second electrode 103 of white organic LED are formed in first electrode 101,
In the present embodiment, second electrode 103 is cathode.
As an embodiment of the present invention, further comprising the steps of in the present embodiment：
S21：Protective layer 6 is formed before forming light path control layer 2.Wherein, protective layer 6 is acrylic or polyimides material
Matter is made, and the setting of 2 μm of thickness, protective layer 6 makes light path control layer 2 not directly form on filter plate, is light path control layer 2
Formation provide good basis, play the role of protection, protective layer 6 is being protected by the methods of printing or etching again after being formed
Light path control layer 2 is prepared on sheath 6.
The present embodiment is the Organnic electroluminescent device of bottom light emitting-type, and light is launched from first electrode 101, then passes through
Light path control layer 2 regulates and controls wavelength.In 3 region of monochromatic sub-pixels, white-light organic light-emitting is adjusted by light path control layer respectively
In diode emergent ray with feux rouges sub-pixel 301, the ratio of green light sub-pixel 302 and the corresponding light of 303 wavelength of blue light sub-pixel
Example, then feux rouges sub-pixel 301, green light picture are filtered out by Red lightscreening plate 501, green color filter 502 and blue color filter 503
The light of element 302 and 303 corresponding wavelength of blue light sub-pixel, effectively increases the luminous efficiency in 3rd area of monochromatic sub-pixels.Compound
In 4 region of sub-pixels, regulate and control each Asia picture in the emergent ray of white organic LED respectively by light path control layer 2
In element 401 after the ratio of particular light ray, recombined white light is remixed into, is gone out from bottom emission.The Organnic electroluminescent device as a result,
The mixed light being made of the monochromatic light and recombined white light of three kinds of colors of RGB launched, improves the utilization rate of white light,
And the luminous efficiency of Organnic electroluminescent device entirety is effectively increased, display effect is effectively strengthened, display performance is improved.
As an embodiment of the present invention, further comprising the steps of in step S5 in the present embodiment：
S51：Carrier functional layer is formed in the both sides up and down of organic luminous layer 102, wherein carrier functional layer includes sky
At least one of cave implanted layer, hole transmission layer, electronic barrier layer, hole blocking layer, electron transfer layer, electron injecting layer.
Embodiment 2
A kind of Organnic electroluminescent device is present embodiments provided, as shown in figure 3, including white organic LED group
At array, array includes several monochromatic 3 regions of sub-pixels and several 4 regions of recombination photons pixel, wherein monochromatic photon
Pixel 3 includes feux rouges sub-pixel 301, green light sub-pixel 302 and blue light sub-pixel 303, and the light-emitting surface of each monochrome sub-pixels 3 is set
It is equipped with optical filter, i.e. the light-emitting surface of feux rouges sub-pixel 301 is equipped with the Red lightscreening plate 501 that can filter out feux rouges, green light sub-pixel
302 light-emitting surface is equipped with the green color filter 502 that can filter out green light, and the light-emitting surface of blue light sub-pixel 303 is equipped with and can filter out
The blue color filter 503 of blue light, each recombination photons pixel 4 include three sub-pixes 401, are mixed to form white light sub-pixel.
As the alternative embodiment of the present invention, monochromatic sub-pixels 3 include feux rouges sub-pixel 301, green light sub-pixel
302, at least one of blue light sub-pixel 303, each recombination photons pixel 4 include at least two sub-pixes 401.
As the convertible embodiment of the present invention, in the present embodiment, monochromatic sub-pixels 3 can also be arbitrary monochromatic light image
One or more combinations in element.
Organnic electroluminescent device provided in an embodiment of the present invention is top illuminating device, and in the present embodiment, each white light is organic
Light emitting diode includes the first electrode 101 being stacked from bottom to top, organic luminous layer 102 and second electrode 103, the first electricity
Pole 101 is the ITO/Ag/ITO reflection anodes (substrate does not mark in figure) being disposed on the substrate, and second electrode 103 is transparent the moon
Pole is provided directly between the upside of first electrode 101, i.e. first electrode 101 and organic luminous layer 102 for regulating and controlling light path
Light path control layer 2, the ratio for regulating and controlling to correspond to wave band light in white organic LED emergent ray, monochrome sub-pixels
The upside of second electrode 103 of white organic LED in region, i.e. light direction, be respectively equipped with Red lightscreening plate 501,
Green color filter 502 and blue color filter 503.
First electrode 101 of the Organnic electroluminescent device provided in an embodiment of the present invention in white organic LED
Light path control layer 2 is arranged in upside, is conducive to the ratio that wave band light is corresponded in the emergent ray to white organic LED
Regulated and controled, so that the white organic LED goes out the light of actually required color from top-emission, to effectively
Improve the luminous efficiency of the Organnic electroluminescent device.
As the alternative embodiment of the present invention, optics control layer 2 can also be arranged optical filter and first electrode 101 it
Between any position, can be achieved the purpose of the present invention, belong to the scope of protection of the present invention.
Specifically, in 3 region of monochromatic sub-pixels, two pole of white-light organic light-emitting is regulated and controled by light path control layer 2 simultaneously
In pipe emergent ray after the correspondence ratio of feux rouges, green light, blue light wavelength, then pass through Red lightscreening plate 501, green color filter respectively
502 and blue color filter 503 filter out the light of 303 corresponding wavelength of feux rouges sub-pixel 301, green light sub-pixel 302 and blue light sub-pixel
Line, and then launch three kinds of monochromatic light of RGB from top device, realize full-color display, Organic Electricity provided in an embodiment of the present invention
Electroluminescent devices add the structure of optical filter to realize full-color display using white light, simple in structure, low in energy consumption, product yield is high.
In 4 region of recombination photons pixel, regulate and control the outgoing of white organic LED respectively by light path control layer 2
Recombined white light is remixed into after the ratio of particular light ray in each sub-pix 401 in light, is gone out from top-emission.This has as a result,
The mixed light being made of the monochromatic light and recombined white light of three kinds of colors of RGB that organic electro luminescent device is launched, improves
The utilization rate of white light, and the luminous efficiency of Organnic electroluminescent device entirety is effectively increased, display effect is effectively strengthened, is carried
High display performance.
Also, the aperture opening ratio of top illuminating device is higher, and light penetration is good, and display effect and luminous efficiency are sent out the bottom of relative to
Optical device is more excellent, is widely used in following art technology general.
As an embodiment of the present invention, in the present embodiment, 2 thickness of light path control layer in feux rouges sub-pixel 301 is big
The thickness of light path control layer 2 in green light sub-pixel 302 is more than the thickness of the light path control layer 2 in blue light sub-pixel 303.Tool
Body, the thickness of the light path control layer 2 in feux rouges sub-pixel 301 is 170nm, the light path control layer 2 in green light sub-pixel 302
Thickness is 140nm, and the thickness of the light path control layer 2 in blue light sub-pixel 303 is 60nm.
As the alternative embodiment of the present invention, 2 thickness of light path control layer, green light sub-pixel in feux rouges sub-pixel 301
The thickness of light path control layer 2 in 302 and the thickness of the light path control layer 2 in blue light sub-pixel 303 are not all the same, can be real
The existing purpose of the present invention, belongs to the scope of protection of the present invention.
As an embodiment of the present invention, in the present embodiment, the light path control corresponding to three sub-pixes 401 of RGB
The thickness of layer 2 is respectively 170nm, 140nm, 60nm.
As the alternative embodiment of the present invention, the thickness phase of the light path control layer 2 corresponding to red blue two sub-pixes 401
Together, the difficulty of preparation process is so simplified.
As the alternative embodiment of the present invention, three sub-pixes of RGB, the 401 corresponding light in recombination photons pixel 4
The thickness of program-controlled preparative layer 2 is not all the same.
As an embodiment of the present invention, in the present embodiment, the area equation of each complex light sub-pix 401, when compound
The area of light sub-pix 401 is 1:1:When 1, white light sub-pixel is combined by partially red, partially green, partially blue three parts " pseudo- white light " respectively
It forms, spectrum is constituted as shown in Fig. 2, luminous efficiency is high, and illumination effect is good.In addition, the area of complex light sub-pix 401 can basis
The luminous situation of white light sub-pixel, carries out the adjustment of white balance, to ensure good illumination effect.
As an embodiment of the present invention, in the present embodiment, light path control layer 2 is made by transparent indium-tin-oxide (ITO)
Standby to form, the refractive index of light path control layer 2 is 1.8；As the alternative embodiment of the present invention, light path control layer 2 is by titanium dioxide
Silicon layer, silicon nitride layer, polyimide layer or the above material composite layer be prepared, the refractive index of light path control layer 2 is 1.4
Within the scope of~2.3.
In the present embodiment, the thickness of light path control layer 2 is within the scope of 0~350nm.
As an embodiment of the present invention, in the present embodiment, the structure of white organic LED is：
ITO/Ag/ITO(30nm/50nm/70nm)/HAT-CN(5nm)/NPB(30nm)/MADN(30nm):DAS–Ph
(5%)/Bhpen (10nm):Li (2%)/HAT-CN (10nm)/NPB (30nm)/CBP (30nm):Ir(ppy)3(15%):Ir
(piq)3(0.5%)/Mg:Ag(150nm).
As the convertible embodiment of the present invention, mesh of the present invention may be implemented in arbitrary structures white organic LED
, belong to the scope of the present invention.
As an embodiment of the present invention, the pixel arrangement structure of the Organnic electroluminescent device in the present embodiment is as schemed
Shown in 5, that is, Organnic electroluminescent device includes the pixel unit of several array arrangements, and each pixel unit includes three monochromes
Sub-pixels 3 and a recombination photons pixel 4；Monochromatic sub-pixels 3 are feux rouges sub-pixel 301, green light sub-pixel 302, blue light
Sub-pixel 303, recombination photons pixel 4 are white light sub-pixel.
As the convertible embodiment of the present invention, include the picture of arbitrary monochrome sub-pixels 3 and arbitrary recombination photons pixel 4
Plain unit, and arbitrarily the purpose of the present invention may be implemented in arrangement combination between pixel unit, belongs to the protection model of the present invention
It encloses.
The present embodiment additionally provides the preparation method of above-mentioned Organnic electroluminescent device, includes the following steps：
S1：Monochromatic 3 region of sub-pixels and 4 region of recombination photons pixel are divided on substrate, wherein monochromatic sub-pixels
3 regions include feux rouges sub-pixel 301, green light sub-pixel 302 and blue light sub-pixel 303, and 4 region of recombination photons pixel includes three
Sub-pix 401.
As an embodiment of the present invention, the substrate in the present embodiment is that TFT drives backboard (not marked in figure).
S2：The first electrode 101 that white organic LED is formed on substrate, in the present embodiment, first electrode 101
For ITO/Ag/ITO reflection anodes；
S3：Light path control layer 2 is formed in first electrode 101, specifically in feux rouges sub-pixel 301, green light sub-pixel
The 302 light path control layers 2 different with thickness is respectively formed in blue light sub-pixel 303, three sub- pictures in recombination photons pixel 4
The different light path control layer 2 of thickness is respectively formed in element 401, and 2 thickness of light path control layer in feux rouges sub-pixel 301 is more than green
The thickness of light path control layer 2 in sub-pixels 302 is more than the thickness of the light path control layer 2 in blue light sub-pixel 303, three Asias
The thickness of light path control layer 2 in pixel 401 is all identical；
As an embodiment of the present invention, in the present embodiment, the thickness of the light path control layer 2 in feux rouges sub-pixel 301
For 170nm, the thickness of the light path control layer 2 in green light sub-pixel 302 is 140nm, the light path control layer in blue light sub-pixel 303
2 thickness is 60nm；The thickness of the light path control layer 2 corresponding to three sub-pixes 401 in recombination photons pixel 4 is respectively
170nm, 140nm, 60nm, in the present embodiment, light path control layer 2 is ITO layer, refractive index 1.8.
S4：The organic luminous layer 102 and second electrode 103 of white organic LED are formed on light path control layer 2,
In the present embodiment, second electrode 103 is transparent cathode；
S5：In 3 region of monochromatic sub-pixels in feux rouges sub-pixel 301, green light sub-pixel 302 and blue light sub-pixel 303
Second electrode 103 on be respectively formed Red lightscreening plate 501, green color filter 502 and blue color filter 503.
As an embodiment of the present invention, further comprising the steps of in the present embodiment：
S21：It is formed before light path control layer 2, forms protective layer 6 in first electrode 101.Wherein, protective layer 6 is sub- gram
Power or polyimides material are made, and the setting of 2 μm of thickness, protective layer 6 makes light path control layer 2 not directly form in first electrode
On 101, good basis is provided for the formation of light path control layer 2, plays the role of protection, protective layer 6 passes through again after being formed
The methods of printing or etching prepare light path control layer 2 on protective layer 6.
The present embodiment is the Organnic electroluminescent device of top emission type, and light is sent out from 103 direction of second electrode from top
It is shot out, emits light first and light path control layer is passed through in 3 region of monochromatic sub-pixels by the regulation and control wavelength of light path control layer 2
2 respectively adjust white organic LED emergent ray in feux rouges sub-pixel 301, green light sub-pixel 302 and blue photons picture
Plain 303 wavelength correspond to the ratio of light, then are filtered out by Red lightscreening plate 501, green color filter 502 and blue color filter 503
The light of 303 corresponding wavelength of feux rouges sub-pixel 301, green light sub-pixel 302 and blue light sub-pixel, effectively increases monochromatic photon picture
The luminous efficiency in plain 3 regions.In 4 region of recombination photons pixel, white-light organic light-emitting two is regulated and controled by light path control layer 2 respectively
Recombined white light is remixed into after the ratio of particular light ray in each sub-pix 401 in the emergent ray of pole pipe, from top-emission
Go out.What the Organnic electroluminescent device went out from top-emission as a result, is by the monochromatic light and recombined white light of three kinds of colors of RGB
The mixed light of composition, improves the utilization rate of white light, and effectively increases the luminous efficiency of Organnic electroluminescent device entirety, has
Effect strengthens display effect, improves display performance.
Also, the aperture opening ratio of top illuminating device is higher, and light penetration is good, and display effect and luminous efficiency are sent out the bottom of relative to
Optical device is more excellent, is widely used in following art technology general.
As an embodiment of the present invention, further comprising the steps of in step S5 in the present embodiment：
S41：Carrier functional layer is formed in the both sides up and down of organic luminous layer 102, wherein carrier functional layer includes sky
At least one of cave implanted layer, hole transmission layer, electronic barrier layer, hole blocking layer, electron transfer layer, electron injecting layer.
The setting of carrier functional layer helps to improve compound effect of the carrier in luminescent layer of first electrode 101 and second electrode 103
Rate.
Embodiment 3
A kind of Organnic electroluminescent device is present embodiments provided, is dual emission device, as shown in figure 4, it is in structure
Difference lies in be equipped with and the first electricity Organnic electroluminescent device in upper and embodiment 1 between first electrode 101 and luminescent layer
The 2 corresponding light path control layer 2 of light path control layer of 101 downside of pole, 103 upside of second electrode are equipped with and the optical filter pair on substrate
The optical filter answered, also, first electrode 101 is transparent ito anode, second electrode 103 is transparent cathode.
As the alternative embodiment of the present invention, at least provided with one layer of light path control layer 2 between the optical filter of upper and lower both sides,
The purpose of the present invention may be implemented, belong to the scope of protection of the present invention.
Comparative example 1
This comparative example provides a kind of Organnic electroluminescent device, and structure is unique the difference is that monochromatic photon with embodiment 1
Light path control layer 2 is not set in pixel 3.
Comparative example 2
This comparative example provides a kind of Organnic electroluminescent device, and structure is unique the difference is that recombination photons with embodiment 1
Light path control layer 2 is not set in pixel 4.
Comparative example 3
This comparative example provides a kind of Organnic electroluminescent device, and structure is unique the difference is that monochromatic photon with embodiment 1
Light path control layer 2 is not set in pixel 3 and recombination photons pixel 4.
Comparative example 4
This comparative example provides a kind of Organnic electroluminescent device, and structure is unique the difference is that monochromatic photon with embodiment 2
Light path control layer 2 is not set in pixel 3.
Comparative example 5
This comparative example provides a kind of Organnic electroluminescent device, and structure is unique the difference is that recombination photons with embodiment 2
Light path control layer 2 is not set in pixel 4.
Comparative example 6
This comparative example provides a kind of Organnic electroluminescent device, and structure is unique the difference is that monochromatic photon with embodiment 2
Light path control layer 2 is not set in pixel 3 and recombination photons pixel 4.
Organnic electroluminescent device described in above-described embodiment and comparative example is tested, test result is as follows table institute
Show：
A kind of Organnic electroluminescent device of the present invention is can be seen that from upper table data to be not only able to effectively improve dress
The luminous efficiency set, and the chromaticity coordinates of each sub-pixel, closer to theoretical value, not only colour gamut is wide, and color it is more beautiful,
Level is abundant, improves using effect.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.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 variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
Variation is still in the protection scope of this invention.
Claims (10)
1. a kind of Organnic electroluminescent device, which is characterized in that including array, the array includes multiple white-light organic light-emittings two
Pole pipe；
Each white organic LED includes the first electrode (101) being stacked, organic luminous layer (102) and second
Electrode (103)；
At least side of the first electrode (101) is provided with the light path control layer (2) for regulating and controlling light path, described for regulating and controlling
The ratio of wave band light is corresponded in white organic LED emergent ray.
2. Organnic electroluminescent device according to claim 1, which is characterized in that the array includes at least one face
Several monochromatic sub-pixels (3) of color and several recombination photons pixels (4)；The light-emitting surface of each monochromatic sub-pixels (3) is set
It is equipped with optical filter.
3. Organnic electroluminescent device according to claim 2, which is characterized in that it is described monochrome sub-pixels (3) include
At least one of feux rouges sub-pixel (301), green light sub-pixel (302), blue light sub-pixel (303)；Each recombination photons picture
Plain (4) include at least two sub-pixes (401), are mixed to form white light sub-pixel.
4. according to claims 1 to 3 any one of them Organnic electroluminescent device, which is characterized in that the light path control layer
(2) refractive index is 1.4~2.3.
5. Organnic electroluminescent device according to claim 4, which is characterized in that in the feux rouges sub-pixel (301)
The thickness of light path control layer (2) in the thickness of light path control layer (2), the green light sub-pixel (302) and the blue photons
The thickness of light path control layer (2) in pixel (303) is not all the same.
6. Organnic electroluminescent device according to claim 4, which is characterized in that each sub-pix (401) is corresponding
The thickness of light path control layer (2) is not all the same.
7. Organnic electroluminescent device according to claim 6, which is characterized in that in the feux rouges sub-pixel (301)
The thickness that light path control layer (2) thickness is more than the light path control layer (2) in the green light sub-pixel (302) is more than the blue photons
The thickness of light path control layer (2) in pixel (303).
8. a kind of preparation method of such as claim 1~7 any one of them Organnic electroluminescent device, which is characterized in that packet
Include following steps：
Monochromatic sub-pixels (3) region and recombination photons pixel (4) region are divided on substrate；
It is respectively formed optical filter in described monochromatic sub-pixels (3) region；
Form the first electrode (101) of white organic LED；
Form light path control layer (2)；
Form the organic luminous layer (102) and second electrode (103) of white organic LED.
9. the preparation method of Organnic electroluminescent device according to claim 8, which is characterized in that forming light path control
The step of protective layer (6) being formed before layer (2) step.
10. the preparation method of Organnic electroluminescent device according to claim 8, which is characterized in that further include forming load
The step of flowing subfunction layer, the carrier functional layer include hole injection layer, hole transmission layer, electronic barrier layer, hole resistance
At least one of barrier, electron transfer layer, electron injecting layer.
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Citations (3)
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| US20090267494A1 (en) * | 2008-04-23 | 2009-10-29 | Samsung Electronics Co., Ltd. | Organic light emitting diode display and manufacturing method thereof |
| US20100053043A1 (en) * | 2008-08-29 | 2010-03-04 | Fujifilm Corporation | Color display and method for producing the same |
| CN102707481A (en) * | 2012-03-15 | 2012-10-03 | 京东方科技集团股份有限公司 | Liquid crystal display panel and manufacturing method thereof and liquid crystal display |
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2017
- 2017-04-28 CN CN201710295724.7A patent/CN108807459A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090267494A1 (en) * | 2008-04-23 | 2009-10-29 | Samsung Electronics Co., Ltd. | Organic light emitting diode display and manufacturing method thereof |
| US20100053043A1 (en) * | 2008-08-29 | 2010-03-04 | Fujifilm Corporation | Color display and method for producing the same |
| CN102707481A (en) * | 2012-03-15 | 2012-10-03 | 京东方科技集团股份有限公司 | Liquid crystal display panel and manufacturing method thereof and liquid crystal display |
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Application publication date: 20181113 |