A kind of white light OLED device and display deviceTechnical field
The present invention relates to field of display technology, and in particular to a kind of white light OLED device and display device.
Background technique
Organic light emitting display panel (full name in English is Organic Light-Emitting Display, abbreviation OLED) toolHave actively that luminous, frivolous, visual angle is big, fast response time, energy conservation, temperature tolerance range is big, Flexible Displays can be achieved and transparent showThe advantages that showing is considered to be next-generation most potential novel flat-plate display technology.
In existing organic light emitting display panel true color method, red, green, blue (three primary colours Red, Green,Blue, abbreviation RGB) pixel juxtaposition method and colored filter (full name in English colorfilter, referred to as CF) method be to send out at presentOpen up most mature two methods.Rgb pixel juxtaposition method needs high-precision metal mask to realize high-resolution, and cost is very high,And it is difficult to realize the uniform preparation of large area.And using white organic LED as backlight, it is filtered again abovePiece can be good at solving the above problems with real red, green, the colored filter method of blue subpixels.
However, causing display panel power consumption to increase since light is by having biggish energy loss after colored filter；Simultaneously as white light be complex light, spectrum covering visible light range, therefore, need to consider when designing white light molecule it is following becauseElement: 1,2 kinds of single-shots in molecule are at least needed to penetrate group；2, the ratio that these single-shots penetrate group how is controlled；3, these lists are matchedEmit the service life of group.In addition, importantly, intramolecular and intermolecular energy transmission can not in luminous organic materialTherefore prediction is difficult design, synthesis white light monomolecular material under the conditions of existing research and development.In the prior art usually using a variety ofThe device architecture that monochromatic luminescent material is blended or monochromatic luminescent layer is stacked realizes white light emission, complex process, yield of devices compared withIt is low.
Summary of the invention
Therefore, the invention solves technology in colored filter display technology power consumption it is big, the problem of complex process.
For this purpose, at least one blue light including being disposed on the substrate is organic the present invention provides a kind of white light OLED deviceLight emitting diode further includes being set up directly on the side of the blue light organic emissive diode far from the substrate, and to describedThe encapsulation function layer that blue light organic emissive diode is packaged；
The light-emitting surface of the blue light organic emissive diode is arranged close to the encapsulation function layer；
It further include quantum dot layer in the encapsulation function layer.
Optionally, the quantum dot layer includes the gold-tinted quantum dot being blended and green light quantum point, or the feux rouges amount being blendedSon point and green light quantum point perhaps yellowish green light quanta point or red-green glow quantum dot.
Optionally, the encapsulation function layer includes the first encapsulated layer, and the quantum dot layer is stacked in first envelopeFill side of the layer far from the blue light organic emissive diode.
Optionally, the encapsulation function layer further includes the second encapsulated layer, and second encapsulated layer is stacked in the amountSon point side of the layer far from first encapsulated layer.
Optionally, the blue light organic emissive diode includes at least one layer of luminescent layer.
Optionally, first encapsulated layer and second encapsulated layer are thin-film encapsulation layer.
The present invention also provides a kind of display device, including the blue light organic emissive diode array layer being disposed on the substrate,And it is stacked encapsulation function layer and filter layer on the array layer light-emitting surface；
The encapsulation function layer is for being packaged the array layer, wherein further include quantum dot layer, for it is describedThe light that array layer issues is mixed to form white light；
The filter layer includes at least two kinds of monochromatic optical conversion elements；Along perpendicular to the orientation substrate, each monochromatic lightThe projection of converting unit on the substrate is overlapped with the projection of each sub-pixel unit in the array layer on the substrate.
Optionally, the quantum dot layer includes the gold-tinted quantum dot being blended and green light quantum point, or the feux rouges amount being blendedSon point and green light quantum point perhaps yellowish green light quanta point or red-green glow quantum dot.
Optionally, the encapsulation function layer includes the first encapsulated layer, and the quantum dot layer is stacked in first envelopeFill side of the layer far from the blue light organic emissive diode.
Optionally, the encapsulation function layer further includes the second encapsulated layer, and second encapsulated layer is stacked in the amountSon point side of the layer far from first encapsulated layer.
Technical solution of the present invention has the advantages that
1. the present invention provides a kind of white light OLED device, including at least one blue light organic emissive being disposed on the substrateDiode further includes being set up directly on the side of the blue light organic emissive diode far from the substrate, and to the blue lightThe encapsulation function layer that Organic Light Emitting Diode is packaged；The light-emitting surface of the blue light organic emissive diode is close to the encapsulationLayer setting；It further include quantum dot layer in the encapsulation function layer.According to Einstein's photon theory: E=h γ=hc/ λ, photonEnergy is inversely proportional with wavelength, and the wavelength of photon is smaller, and energy is bigger.The blue light that blue light organic emissive diode issues in the applicationWavelength is relatively short in visible light, and energy is larger, can excite that quantum dot layer medium wavelength is relatively long, energy is relatively smallColour mixture forms white light to the light that quantum dot light emitting, blue light and quantum dot issue again, due to not being related to single point of white light in production processSub- design of material and different luminous organic material blending technologies, production cost and process costs are lower.
Simultaneously as blue light organic emissive diode and quantum dot layer shine, and therefore, white light OLED provided by the inventionDevice luminous efficiency and luminous brightness with higher.
In addition, that is, blue light organic emissive diode is independent device since quantum dot layer is formed directly on the first encapsulated layerTherefore part even if occurring bad in the attachment or production process of quantum dot layer, can also repeat the workshop section, device production atThis is low.
2. the present invention also provides a kind of display device, including the blue light organic emissive diode array being disposed on the substrateLayer, and the encapsulation function layer and filter layer that are stacked on the array layer light-emitting surface；The encapsulation function layer for pairThe array layer is packaged, wherein further including quantum dot layer, for forming white light with the array layer；The filter layer includesAt least two kinds of monochrome optical conversion elements；Along perpendicular to the orientation substrate, each monochromatic optical conversion element is on the substrateThe projection of light opening on the substrate that goes out with each blue light organic emissive diode is projected to be overlapped.Display dress provided by the inventionIt sets and provides white light, luminous efficiency with higher and luminance by blue light organic emissive diode array layer and quantum dot layer colour mixtureDegree can effectively increase gamut area, so that display device simultaneously as quantum dot has narrow and symmetrical fluorescence emission peakColor is more abundant, beautiful.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior artEmbodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described belowAttached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative laborIt puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of white light OLED device described in the embodiment of the present invention 1；
Fig. 2 is the structural schematic diagram of white light OLED device described in the embodiment of the present invention 2；
Fig. 3 is the structural schematic diagram of display device described in the embodiment of the present invention 3；
Fig. 4 is the structural schematic diagram of display device described in the embodiment of the present invention 4.
Appended drawing reference:
1- substrate, 2- blue light organic emissive diode, the first encapsulated layer of 3-, 4- quantum dot layer, 5- cover board, 6- second are encapsulatedLayer, 7- filter layer；
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementationExample is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skillPersonnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely toConvenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second "," third " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.It should be noted that of the inventionIn description, " device ", which should be understood as that at least one Organic Light Emitting Diode or several juxtaposed light directions are in the same direction, to be hadMachine light emitting diode；" coating " should be understood as being formed by film on the first encapsulated layer by printing technique, coating technique.
Embodiment 1
The present embodiment provides a kind of white light OLED devices, as shown in Figure 1, including substrate 1 and being arranged on substrate 1 at leastOne blue light organic emissive diode 2 further includes being set up directly on side of the blue light diode 2 far from substrate 1, and have to blue lightThe encapsulation function layer that machine light emitting diode is packaged.The light-emitting surface of blue light organic emissive diode 2 is close to encapsulation one functional layerSetting, encapsulation function layer include the first encapsulated layer 3 being formed directly on blue light organic emissive diode 2 and are stacked in the first envelopeFill the quantum dot layer 4 on layer 3.
According to Einstein's photon theory: E=h γ=hc/ λ, photon energy are inversely proportional with wavelength, and the wavelength of photon is got overSmall, energy is bigger.The emission wavelength of quantum dot layer 4 is relatively long, energy is relatively small, sends out in blue light organic emissive diode 2It shines under the excitation of the relatively small blue light of wavelength out, and is blended to be formed with the light that blue light organic emissive diode 2 issuesWhite light.
Substrate 1 in the application is selected from but not limited to glass substrate or flexible substrate or sheet metal, wherein flexibleSubstrate is selected from but not limited to polyethylene terephthalate (PET), polyethylene naphthalate (PEN) or poly-succinic secondDiol ester (PES) etc..
Blue light organic emissive diode 2 is selected from but not limited to the Organic Light Emitting Diode that can arbitrarily emit blue light, knotStructure includes anode, organic luminous layer and cathode and hole injection layer, hole transmission layer, electron transfer layer, electron injecting layer etc.One of carrier functional layer is a variety of.
Blue light organic emissive diode 2 can also be tandem multi-luminescent layer blue light organic emissive diode, i.e., multiple to shineDiode series are connected by articulamentum (charge generation layer, CGL) between adjacent emissive layers.
Quantum dot layer 4 is selected from but not limited to the gold-tinted quantum dot and green light quantum point being blended, or the red quantum being blendedPoint and green light quantum point perhaps yellowish green light quanta point or red-green glow quantum dot；It can be sent out with blue light organic emissive diode 2Light out, which is blended, to be formed the quantum-dot structure of white light the purpose of the application may be implemented, and the protection scope of the application is belonged to.
First encapsulated layer 3 is thin-film encapsulation layer, can be organic planarization film or the single layer of inorganic water oxygen barrier filmOr the encapsulation of multi-layer transparent film layer, can also be multi-layer transparent thin-film package, as be spaced the organic planarization film that is stacked andInorganic water oxygen barrier film.
As a kind of embodiment of the application, the first encapsulated layer 3 includes that the spaced inorganic water oxygen barrier of stacking is thinFilm/organic planarization film/inorganic water oxygen barrier film, encapsulation function layer are as follows: inorganic water oxygen barrier film/organic planarizationization is thinFilm/inorganic water oxygen barrier film/4 structure of quantum dot layer；As convertible embodiment of the invention, inorganic water oxygen barrier film andThe quantity and intervening sequences of organic planarization film are without being limited thereto, are able to achieve the purpose of the application, belong to the guarantor of the applicationProtect range.
As the another embodiment of the application, the first encapsulated layer 3 is at least one layer of inorganic water oxygen barrier film, encapsulationFunctional layer are as follows: organic water oxygen barrier film/4 structure of quantum dot layer.
As the another embodiment of the application, the first encapsulated layer 3 is at least one layer of organic planarization film, encapsulates functionErgosphere are as follows: organic planarization film/4 structure of quantum dot layer.
Quantum dot layer 4 is selected from but not limited to commercial attachment quantum dot film, and passes through coating or printable technique systemStandby film.
As a kind of embodiment of the application, as shown in Figure 1, being additionally provided with cover board 5, cover board 5 on the first encapsulated layer 3For transparent glass or flexible substrate, wherein flexible substrate be can be polyethylene terephthalate (PET), poly- naphthalenedicarboxylic acidGlycol ester (PEN) or polyethylene glycol succinate (PES) etc..
The blue light wavelength that blue light organic emissive diode 2 issues in the application is shorter, can excite quantum in quantum dot layer 4Point shine, then with blue light colour mixture formed white light, due to be not related in production process white light monomolecular material be related to it is difference organicLuminescent material blending technology, production cost and process costs are lower.Simultaneously as blue light organic emissive diode 2 and quantumPoint layer 4 shines, therefore, white light OLED device luminous efficiency and luminous brightness with higher provided by the invention.
In addition, that is, blue light organic emissive diode 2 is independent since quantum dot layer 4 is formed directly on the first encapsulated layer 3Therefore device even if occurring bad in the attachment or production process of quantum dot layer 4, can also repeat the workshop section, device productionIt is at low cost.
The preparation method of above-mentioned white light OLED device includes:
S1, anode is formed by sputtering or coating process on substrate 1；
S2, organic luminous layer and carrier functional layer are formed on anode by evaporation process or InkJet printing processes；
S3, cathode is re-formed by inkjet printing or evaporation process；
S4, the first encapsulated layer 3 is formed on cathode by coating or InkJet printing processes；
S5, quantum dot layer 4 is mounted on the first encapsulated layer 3 or forms quantum dot layer by techniques such as printable, vapor depositions4；
S6, cover board 5 is formed on quantum dot layer 4.
Embodiment 2
The present embodiment provides a kind of white light OLED devices, as shown in Fig. 2, including the blue light of substrate 1 and setting on substrate 1Organic Light Emitting Diode 2 is formed in the first encapsulated layer 3, the quantum dot of side of the blue light organic emissive diode 2 far from substrate 1The 4, second encapsulated layer 6 of layer and cover board 5.That is, encapsulation function layer includes the first encapsulated layer 3 of stacking, the encapsulation of quantum dot layer 4, secondLayer 6.Quantum dot layer 4 is located at 2 light-emitting surface of blue light organic emissive diode, in the blue light that blue light organic emissive diode 2 issuesWhite light is formed under excitation.
Second encapsulated layer 6 is also thin-film encapsulation layer, can be organic planarization film or inorganic water with the first encapsulated layer 3The encapsulation of oxygen barrier film single-layer and transparent film layer.It can also be multi-layer transparent thin-film package, as being spaced the organic planarization being stackedChange film and inorganic water oxygen barrier film.
As a kind of embodiment of the application, the second encapsulated layer 6 includes that the spaced inorganic water oxygen barrier of stacking is thinFilm/organic planarization film/inorganic water oxygen barrier film, encapsulation function layer are as follows: the inorganic water of 3/ quantum dot layer of the first encapsulated layer 4/Oxygen barrier film/organic planarization film/inorganic water oxygen barrier film structures；It is inorganic as convertible embodiment of the inventionThe quantity and intervening sequences of water oxygen barrier film and organic planarization film are without being limited thereto, are able to achieve the purpose of the application,Belong to the protection scope of the application.
As the another embodiment of the application, the second encapsulated layer 6 is at least one layer of inorganic water oxygen barrier film, encapsulationFunctional layer are as follows: the organic water oxygen barrier film structures of 3/ quantum dot layer of the first encapsulated layer 4/.
As the another embodiment of the application, the second encapsulated layer 6 is at least one layer of organic planarization film, encapsulates functionErgosphere are as follows: 3/ quantum dot layer of the first encapsulated layer, 4/ organic planarization membrane structure.
It is provided with the double-deck encapsulated layer in the application, effectively plays and blue light organic emissive diode 2 is protected, avoidErosion of the water oxygen to it.The second encapsulated layer 6 is set simultaneously on quantum dot layer 4, effectively plays the protection to quantum dot layer 4,Subsequent workshop section is effectively avoided to extend the service life of quantum dot layer 4 to the abrasion of quantum dot layer 4.
Embodiment 3
The present embodiment provides a kind of display devices, as shown in figure 3, including the organic hair of blue light being stacked on substrate 1Light diode array layer, and the encapsulation function layer, filter layer 7 and the cover board 5 that are stacked on array layer light-emitting surface.
Array layer includes the blue light organic emissive diode 2 of several array arrangements；Encapsulation function layer is used for the arrayLayer is packaged, and including the first encapsulated layer 3 being stacked and quantum dot layer 4, quantum dot layer 4 is used for and the blue light in array layerOrganic Light Emitting Diode 2 forms white light.
Each of array layer or several adjacent blue light organic emissive diodes 2 form a sub-pixel listMember, adjacent several sub-pixel units form a pixel unit, and the sub-pixel unit quantity in each pixel unit can be withIt is identical or different, it can be 1-4.Filter layer 7 includes at least two kinds of monochromatic optical conversion elements, for filtering out feux rouges, green light, indigo plantThe primary colours such as light shine；Along the direction perpendicular to 7 place plane of filter layer, each projection of the monochrome optical conversion element on substrate and eachProjection of the sub-pixel unit on substrate is overlapped, and is used for the corresponding blue light organic emissive diode 2 of each sub-pixel unit and amountThe blending white light that son point layer 4 issues is filtered into monochromatic light respectively, that is, realizes that the primary colours of each sub-pixel shine.Each pixel unit packet1-4 sub-pixel unit is included, to realize full-color display.
The application is fairly set out for convenience, as one embodiment of the application, in the present embodiment, each pixel unitIn include 3 sub-pixel units, contain only a blue light organic emissive diode 2 in each sub-pixel unit, pixel unit is in battle arrayArray arrangement is formed in column layer.Filter layer 7 includes 3 kinds of monochromatic optical conversion elements, respectively red, green and blue.Along verticalIn the direction of 7 place plane of filter layer, projection and each blue light organic emissive diode 2 of each monochrome optical conversion element on substrateThe projection of (i.e. sub-pixel unit) on substrate 1 is overlapped, for filtering out sub-pixel corresponding to each blue light organic emissive diode 2Primary colours light required by unit.
Embodiment 4
The present embodiment provides a kind of display device, as shown in figure 4, structure is with embodiment 3, unlike: on quantum dot layer 4It is additionally provided with the second encapsulated layer 6,6 structure of the second encapsulated layer is the same as embodiment 2.
Filter layer 7 is arranged on the second encapsulated layer 6, is located at 2 light-emitting surface of blue light organic emissive diode, for blue light to haveThe white light that machine light emitting diode 2 and quantum dot layer 4 are formed is converted to monochromatic light；For example, being converted to feux rouges, green light, blue light etc.Primary lights.
Each of array layer or several adjacent blue light organic emissive diodes 2 form a sub-pixel listMember, adjacent several sub-pixel units form a pixel unit, and the sub-pixel unit quantity in each pixel unit can be withIt is identical or different, it can be 1-4.Filter layer 7 includes at least two kinds of monochromatic optical conversion elements, is put down along perpendicular to where filter layer 7The direction in face, the projection of each monochrome optical conversion element on substrate 1 are overlapped with the projection of each sub-pixel unit on substrate 1.
Further include the first barrier rib for separating each sub-pixel unit in array layer, further includes separating respectively in filter layer 7Second barrier rib of monochromatic optical conversion element.Along perpendicular to in-plane where array layer, the throwing of the second barrier rib on substrate 1Shadow is overlapped with the projection of the first barrier rib on substrate 1.
The white light that blue light organic emissive diode and quantum dot layer are formed is filtered by place using filter layer in the applicationReason, so as to so that its light for issuing different colours, and then realizes full-color display.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is rightFor 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 orIt changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation orIt changes still within the protection scope of the invention.