CN108511617A - Organnic electroluminescent device - Google Patents
Organnic electroluminescent device Download PDFInfo
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- CN108511617A CN108511617A CN201810470032.6A CN201810470032A CN108511617A CN 108511617 A CN108511617 A CN 108511617A CN 201810470032 A CN201810470032 A CN 201810470032A CN 108511617 A CN108511617 A CN 108511617A
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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
- 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
- H10K50/13—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 comprising stacked EL layers within one EL unit
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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
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/852—Arrangements for extracting light from the devices comprising a resonant cavity structure, e.g. Bragg reflector pair
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Abstract
The present invention relates to display technology fields, disclose a kind of Organnic electroluminescent device, including the monochromatic light Organic Light Emitting Diode of m kind difference emission wavelengths or the white organic LED for being provided with optical filter；The Organic Light Emitting Diode of at least one emission wavelength with micro-cavity structure includes at least two luminescent layers；The microcavity light path L of Organic Light Emitting Diode with micro-cavity structure and the emission wavelength λ of corresponding luminescence unit meet following relationship：Li=niλi；Wherein, n >=2, n are positive integer, and the corresponding n of at least one Organic Light Emitting Diode is more than or equal to 3；M >=i >=1, i, m are positive integer.N rank microcavity effects can be achieved i.e. in the Organic Light Emitting Diode with micro-cavity structure, and n is the positive integer more than or equal to 2, you can realizes second order microcavity, three rank microcavitys, quadravalence microcavity or higher order microcavity, enhances microcavity effect, further narrowed spectrum, and then improves gamut area.
Description
Technical field
The present invention relates to display technology fields, and in particular to a kind of Organnic electroluminescent device.
Background technology
Display of organic electroluminescence (full name in English Organic Light Emitting Display, abbreviation OLED) is
Active luminous display unit since it has many advantages, such as that high contrast, wide viewing angle, low-power consumption, volume are thinner, and can pass through spray
Prepared by black printing technique and roll-to-roll (roll to roll) technique, it is easy to accomplish Flexible Displays are current flat panel displays
In attract attention most one of technologies.
With the continuous development of OLED technology, increasingly higher demands are proposed to display device performance.For example, improving color
Domain etc..So-called colour gamut is also to refer to the summation for the color that a technological system can generate to a kind of method that color is encoded.
Fig. 1 is NTSC (National Television Standards Committee (U.S.) National Television Standards Committee) systems
Fixed chromaticity coordinates figure, it can be seen from the figure that gamut area is bigger, the display color of display device is abundanter, and viewing experience is got over
It is good.
In order to adapt to the development trend in epoch, in the prior art generally by way of improving three primary colours excitation purity, improve
Gamut area.Specifically：The first, synthesis of narrow spectral luminescence material improves pixel light emission excitation purity using narrow spectral luminescence material；
The second, quantum dot is introduced, excitation purity is improved using the narrow spectral characteristic of quantum dot.
But above-mentioned solution all has respective defect, for example, in scheme one, luminous organic material design, synthesis
Heavy workload, low yield, it is also necessary to pass through a large amount of experimental verification, R＆D costs are high；In scheme two, the introducing of technology of quantum dots
Although colour gamut can be improved, it is substantially luminescence generated by light, not electroluminescent, and luminous efficiency is relatively low, in addition, the program is big
Increase process complexity greatly, it is difficult to realize high density pixel arrangement.
Invention content
For this purpose, the technical problem to be solved by the present invention is in the prior art, OLED device colour gamut is not high enough.
In order to solve the above technical problems, the technical solution adopted by the present invention is as follows：
An embodiment of the present invention provides a kind of Organnic electroluminescent devices, include the luminescence unit of m kind difference emission wavelengths,
The luminescence unit is monochromatic light Organic Light Emitting Diode or the white organic LED for being provided with optical filter；
At least one Organic Light Emitting Diode has micro-cavity structure；At least one emission wavelength with micro-cavity structure
Organic Light Emitting Diode include at least two luminescent layers；
The microcavity light path L of the Organic Light Emitting Diode with the micro-cavity structure and the corresponding luminescence unit
Emission wavelength λ meet following relationship：
Li=niλi
Wherein, n >=2, n are positive integer, and the corresponding n of at least one Organic Light Emitting Diode is more than or equal to 3；M >=i >=1, i,
M is positive integer.
Optionally, 577nm >=λ >=492nm, the corresponding Organic Light Emitting Diode include two luminescent layers.
Optionally, the microcavity chamber of the corresponding Organic Light Emitting Diode of the luminescence unit of different emission wavelengths grows infull phase
Together.
Optionally, luminescent layer described in the corresponding Organic Light Emitting Diode of the luminescence unit of different emission wavelengths
Quantity is not all the same.
Optionally, luminescent layer described in the corresponding Organic Light Emitting Diode of the luminescence unit of different emission wavelengths
Thickness is not all the same.
Optionally, the light path of the luminescent layer and reflection electrode layer in the Organic Light Emitting Diode is λ/4 a*；Wherein, a
For odd number.
Optionally, transparent articulamentum, institute are provided between the luminescent layer adjacent in each Organic Light Emitting Diode
The thickness for stating transparent articulamentum is 5nm-100nm.
Optionally, the refractive index of the transparent articulamentum is at least one of metal layer, carrier functional layer or more
The stepped construction of kind.
Optionally, the luminescent layer in the Organic Light Emitting Diode with the micro-cavity structure includes at least one
Kind hot activation postpones (TADF) material.
Optionally, the luminescent layer includes two kinds of hot activation delay (TADF) materials, two kinds of hot activation delays
(TADF) material can form exciplex.
Optionally, it is provided with light removing layer on the light-emitting surface of each Organic Light Emitting Diode.
Technical scheme of the present invention has the following advantages that：
Organnic electroluminescent device provided in an embodiment of the present invention includes the luminescence unit of m kind difference emission wavelengths, i.e. m
The light of the different emission wavelengths of kind mixes, and realizes full-color display.Wherein, luminescence unit is the list with different emission wavelengths
Coloured light Organic Light Emitting Diode or the white organic LED for being provided with optical filter, that is, can be it is a variety of have different hairs
The monochromatic light Organic Light Emitting Diode of optical wavelength is composed, and realizes full-color display；Can also be by multiple white-light organic light-emittings
Diode combinations form, and the light of different wave length is filtered out through optical filter, are mixed into full-color display；It can also be by different emission wavelengths
Monochromatic light Organic Light Emitting Diode and white organic LED collectively constitute full-color display.Therefore have suitable for different
Machine light emitting diode, application range are wider.
In the microcavity of Organic Light Emitting Diode, when the wavelength of chamber length and light wave is in the same order of magnitude, specific wavelength
Light can be selected and be reinforced, and realized spectrum narrowing, that is, generated microcavity effect.
Each Organic Light Emitting Diode microcavity light path L and emission wavelength λ with micro-cavity structure meets following relationship：
Li=niλi
Wherein, n >=2, n are positive integer, and the corresponding n of at least one Organic Light Emitting Diode is more than or equal to 3；M >=i >=1, i,
M is positive integer.
I other words the microcavity light path L of the Organic Light Emitting Diode with micro-cavity structure, which is it, corresponds to shining for luminescence unit
N times of wavelength, i.e., can be achieved n rank microcavity effects in the Organic Light Emitting Diode with micro-cavity structure, and n be more than or equal to
2 positive integer, you can realize second order microcavity, three rank microcavitys, quadravalence microcavity or higher order microcavity, microcavity effect is enhanced, into one
The spectrum that narrowed is walked, and then improves gamut area.
In addition, at least two luminescent layers at least one Organic Light Emitting Diode with micro-cavity structure, you can root
According to actual demand, two luminescent layers or three luminescent layers or more luminescent layer are set in certain or a variety of Organic Light Emitting Diodes.
The microcavity light path on the one hand increasing certain or a variety of Organic Light Emitting Diodes as a result, plays enhancing microcavity effect, improves colour gamut
The effect of area ensures the high colour gamut of Organnic electroluminescent device entirety；On the other hand, luminous flux is significantly increased, is improved
Luminous efficiency and illumination effect.
Organnic electroluminescent device provided in an embodiment of the present invention, the corresponding organic hair of luminescence unit of different emission wavelengths
The microcavity chamber length of optical diode is not all the same.Wherein, a key factor of a length of regulation and control microcavity light path of chamber, different emission wavelengths
The corresponding Organic Light Emitting Diode of luminescence unit microcavity chamber length it is not all the same so that its corresponding microcavity light path is not yet
Exactly the same, i.e. microcavity exponent number is not all the same, you can is arranged according to the attribute (such as wavelength, spectrum etc.) of different emergent lights different
Microcavity effect exponent number, and then realize best spectrum narrowing effect and best gamut area.
Organnic electroluminescent device provided in an embodiment of the present invention, the corresponding organic hair of luminescence unit of different emission wavelengths
The luminous layer number of optical diode is not all the same, you can according to the attribute (such as wavelength, spectrum etc.) of different emergent lights be difference
The luminescent layer of the Organic Light Emitting Diode setting different number of emission wavelength, and then adjust what emergent light was propagated in corresponding microcavity
Light path, the Organic Light Emitting Diode for realizing different emergent lights correspond to different microcavity intensity.Similarly, the embodiment of the present invention carries
The Organnic electroluminescent device of confession, light emitting layer thickness is not in the corresponding Organic Light Emitting Diode of luminescence unit of different emission wavelengths
It is exactly the same, it can be according to the Organic Light Emitting Diode that the attribute (such as wavelength, spectrum etc.) of different emergent lights is different emission wavelengths
The luminescent layer of different-thickness is set, and then adjusts the light path that emergent light is propagated in corresponding microcavity, realizes different emergent lights
Organic Light Emitting Diode corresponds to different microcavity intensity.
Organnic electroluminescent device provided in an embodiment of the present invention, luminescent layer and reflection electrode layer in Organic Light Emitting Diode
Light path be λ/4 a*；Wherein, a is odd number.Luminescent layer is located at the position of microcavity medium wave peak or trough as a result, effectively increases hair
Light efficiency.
Organnic electroluminescent device provided in an embodiment of the present invention has the hair in the Organic Light Emitting Diode of micro-cavity structure
Photosphere includes at least one hot activation delay (TADF) material.Relative to traditional emitting layer material, hot activation delayed fluorescence
Material at room temperature can convert the triplet excitons that originally cannot be shone to utilizable singlet exciton, therefore shine
Increase hot activation delay material in layer and help to realize higher luminous efficiency, while can ensure higher excitation purity.
Organnic electroluminescent device provided in an embodiment of the present invention is provided with light on the light-emitting surface of each Organic Light Emitting Diode
Removing layer, the setting of light removing layer improve the utilization rate of light, improve the luminous efficiency of Organnic electroluminescent device.
Description of the drawings
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 art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in being described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, other drawings may also be obtained based on these drawings.
Fig. 1 is existing NTSC color gamut figure；
Fig. 2 a are a kind of structural schematic diagram of embodiment of Organnic electroluminescent device provided in an embodiment of the present invention；
Fig. 2 b are a kind of structural schematic diagram of embodiment of Organnic electroluminescent device provided in an embodiment of the present invention；
Fig. 3 is a kind of structural schematic diagram of embodiment of Organnic electroluminescent device provided in an embodiment of the present invention；
Fig. 4 is the structural schematic diagram of luminescent layer in Organnic electroluminescent device provided in an embodiment of the present invention；
Fig. 5 is a kind of structural schematic diagram of embodiment of Organnic electroluminescent device provided in an embodiment of the present invention；
Fig. 6 is a kind of structural schematic diagram of embodiment of Organnic electroluminescent device provided in an embodiment of the present invention；
Fig. 7 is a kind of structural schematic diagram of embodiment of Organnic electroluminescent device provided in an embodiment of the present invention.
Reference numeral：
1- Organic Light Emitting Diodes；11- first electrode layers；The reflecting layer 111-；112- anode layers；12- luminescent layers；121- master
Body material；122- guest materials；13- the second electrode lays；131- metal oxide layers；132- metal layers；The transparent articulamentums of 14-；
15- light compensation layers；151- hole injection layers；152- hole transmission layers；153- electronic barrier layers；154- hole blocking layers；155-
Electron transfer layer；156- electron injecting layers；16- optical filters；17- light removing layers.
Specific implementation mode
Technical scheme of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
The every other embodiment that personnel are 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 " first ", " second " are used for description purposes only, and cannot
It is interpreted as indicating or implying relative importance.
As long as in addition, technical characteristic involved in invention described below different embodiments non-structure each other
It can be combined with each other at conflict.
An embodiment of the present invention provides a kind of Organnic electroluminescent devices, include the luminescence unit of m kind difference emission wavelengths,
Luminescence unit is monochromatic light Organic Light Emitting Diode 1 or is provided with the white organic LED 1 of optical filter 16, as needed
The type of the wavelength selection optical filter of emergent light is Red lightscreening plate or green light optical filter or blue filter.
That is, in the Organnic electroluminescent device m kinds difference emission wavelength luminescence unit, i.e. m kinds difference emission wavelength
Light mixes, and realizes full-color display.As shown in Figure 2 a, luminescence unit can be a variety of monochromes with different emission wavelengths
Light Organic Light Emitting Diode is composed, and realizes full-color display, such as feux rouges Organic Light Emitting Diode, green light organic light-emitting diodes
Pipe, blue light organic emissive diode combinations realize full-color display；As shown in Figure 2 b, can also be by multiple white-light organic light-emittings two
Pole pipe is composed, and the light of different wave length is filtered out through optical filter, and full-color display is mixed into after such as filtering out feux rouges, green light, blue light；Also
Can be that full-color show is collectively constituted by the monochromatic light Organic Light Emitting Diode and white organic LED of different emission wavelengths
Show.Therefore it is suitable for different Organic Light Emitting Diodes, application range is wider.
In the present embodiment, at least one Organic Light Emitting Diode has micro-cavity structure, two pole of feux rouges and blue light organic emissive
Pipe does not have micro-cavity structure, and green light Organic Light Emitting Diode has micro-cavity structure.In the microcavity of Organic Light Emitting Diode, work as chamber
In the same order of magnitude, the light of specific wavelength can be selected and be reinforced long and light wave wavelength, realized spectrum narrowing, that is, generated
Microcavity effect.
Specifically, Organic Light Emitting Diode 1 includes first electrode layer 11, luminescent layer 12 and the second electrode lay being stacked
13, wherein first electrode layer 11 is reflection electrode layer, and the second electrode lay 13 is half-reflection and half-transmission electrode layer, 11 He of first electrode layer
Micro-cavity structure is formed between the second electrode lay 13.
The emission wavelength λ of the microcavity light path L of Organic Light Emitting Diode with micro-cavity structure and corresponding luminescence unit
Meet following relationship：
Li=niλi
Wherein, n >=2, n are positive integer, and the corresponding n of at least one Organic Light Emitting Diode is more than or equal to 3；M >=i >=1, i,
M is positive integer.
L specifically refers to the light that luminescent layer is sent out and is reflected by first electrode layer, reflects, has returned to using the second electrode lay
Equivalent road caused by the distance and first electrode layer and the reflection phase shift of the second electrode lay that beginning position is propagated during this
Journey.Wherein, the distance of propagation is generally the thickness of each layer that light is passed through and the sum of products of corresponding refractive index twice.
I other words the microcavity light path L of the Organic Light Emitting Diode with micro-cavity structure, which is it, corresponds to shining for luminescence unit
N times of wavelength, i.e., can be achieved n rank microcavity effects in the Organic Light Emitting Diode with micro-cavity structure, and n be more than or equal to
2 positive integer, you can realize second order microcavity, three rank microcavitys, quadravalence microcavity or higher order microcavity, microcavity effect is enhanced, into one
The spectrum that narrowed is walked, and then improves gamut area.
Preferably, niNot all the same, i.e., exponent number, that is, intensity of microcavity effect is not all the same in each Organic Light Emitting Diode, i.e.,
The exponent number of different microcavity effects can be set according to the attribute (such as wavelength, spectrum etc.) of different emergent lights, and then realized most
Good spectrum narrowing effect and best gamut area.
For example, the indigo plant of the chromaticity coordinates and high gamut standards due to the corresponding Organic Light Emitting Diode of blue light emitting wavelength itself
Photochromic coordinate is closer to, and the corresponding Organic Light Emitting Diode of red light-emitting wavelength can realize colour gamut by spectral red shift
Extension, and the corresponding Organic Light Emitting Diode of green luminescence wavelength is due to the limitation of itself, it is difficult to as red light-emitting wavelength pair
The Organic Light Emitting Diode answered realizes the extension of colour gamut as blue light organic emissive diode.It therefore, can be by green luminescence
The microcavity exponent number of the corresponding Organic Light Emitting Diode of wavelength is set greater than feux rouges and the corresponding organic light emission of blue light emitting wavelength
The microcavity exponent number of diode.Such as the microcavity exponent number n of the corresponding Organic Light Emitting Diode of green luminescence wavelength is set as 3 or more
The microcavity exponent number of height, feux rouges and the corresponding Organic Light Emitting Diode of blue light emitting wavelength is then set as 2, thus can realize that green light is sent out
The microcavity intensity of the corresponding Organic Light Emitting Diode of optical wavelength Organic Light Emitting Diode corresponding with feux rouges and blue light emitting wavelength
Microcavity intensity match, realize the high colour gamut of entire Organnic electroluminescent device.
In the present embodiment, as shown in figures 2 a and 2b, the organic light emission two of at least one emission wavelength with micro-cavity structure
Pole pipe 1 includes at least two luminescent layers 12.It can be arranged in certain or a variety of Organic Light Emitting Diodes according to actual demand
Two luminescent layers or three luminescent layers or more luminescent layer.Certain or a variety of Organic Light Emitting Diodes are on the one hand increased as a result,
Microcavity light path, play the role of enhance microcavity effect, improve gamut area, ensure Organnic electroluminescent device entirety high color
Domain；On the other hand, luminous flux is significantly increased, luminous efficiency and illumination effect are improved.
For example, two luminescent layers, green luminescence wavelength X will be arranged in the corresponding Organic Light Emitting Diode of green luminescence wavelength
For 492nm-577nm；A luminescent layer, feux rouges hair are respectively provided in feux rouges and the corresponding Organic Light Emitting Diode of blue light emitting wavelength
Light wavelength lambda is 600nm-760nm, and blue light emitting wavelength X is 435-480nm；Or green light and red light-emitting wavelength is corresponding has
Two luminescent layers are respectively provided in machine light emitting diode, setting one is luminous in the corresponding Organic Light Emitting Diode of blue light emitting wavelength
Layer.
As a kind of optional embodiment, the corresponding Organic Light Emitting Diode of the luminescence units of different emission wavelengths 1 it is micro-
Chamber chamber length is not all the same.Wherein, a key factor of a length of regulation and control microcavity light path of chamber, the luminescence unit pair of different emission wavelengths
The microcavity chamber length for the Organic Light Emitting Diode answered is not all the same so that its corresponding microcavity light path is also not all the same, i.e., micro-
Chamber exponent number is not all the same, you can different microcavity effects is arranged according to the attribute (such as wavelength, spectrum etc.) of different emergent lights
Exponent number, and then realize best spectrum narrowing effect and best gamut area.
It is provided between adjacent luminescent layer 12 as a kind of optional embodiment, in each Organic Light Emitting Diode 1 transparent
Articulamentum 14, transparent articulamentum 14, which is selected from, is selected from but not limited to Li2CO3、HAT-CN、TAPC、Li2CO3、HAT-CN、TAPC:
One kind in the materials such as HAT-CN, Ag, ITO being formed by film layer, can also be multilayer laminated composite construction, for example, stacking is set
The Li set2CO3/ HAT-CN/TAPC etc..The thickness of transparent articulamentum 14 is 5nm-100nm.
HAT-CN is six cyano -1,4,5,8,9,12- of 2,3,6,7,10,11-, six azepine benzophenanthrenes；
TAPC is 4,4'- cyclohexyl two [N, N- bis- (4- aminomethyl phenyls) aniline].
As a kind of optional embodiment, sent out in the corresponding Organic Light Emitting Diode of the luminescence units of different emission wavelengths 1
12 quantity of photosphere is not all the same.Can be different emission wavelengths according to the attribute (such as wavelength, spectrum etc.) of different emergent lights
The luminescent layer of different number is arranged in Organic Light Emitting Diode, and then adjusts the light path that emergent light is propagated in corresponding microcavity, realizes
The Organic Light Emitting Diode of different emergent lights corresponds to different microcavity intensity.For example, the corresponding organic hair of green luminescence wavelength
Two luminescent layers are set in optical diode, a hair is respectively provided in feux rouges and the corresponding Organic Light Emitting Diode of blue light emitting wavelength
Photosphere.
As a kind of optional embodiment, as shown in figure 3, Organnic electroluminescent device provided in an embodiment of the present invention, no
With the luminescence unit of emission wavelength, 12 thickness of luminescent layer is not all the same in corresponding Organic Light Emitting Diode 1, can be gone out according to difference
The attribute (such as wavelength, spectrum etc.) for penetrating light is that shining for different-thickness is arranged in the Organic Light Emitting Diode of different emission wavelengths
Layer, and then the light path that emergent light is propagated in corresponding microcavity is adjusted, the Organic Light Emitting Diode for realizing different emergent lights corresponds to
Different microcavity intensity.
For example, by the thickness of the luminescent layer of the corresponding Organic Light Emitting Diode of green luminescence wavelength be set greater than feux rouges and
The thickness of the luminescent layer of the corresponding Organic Light Emitting Diode of blue light emitting wavelength.
As a kind of optional embodiment, the light path of luminescent layer 12 and reflection electrode layer in Organic Light Emitting Diode 1 is a*
λ/4；Wherein, a is odd number.Luminescent layer is located at the position of microcavity medium wave peak or trough as a result, effectively increases luminous efficiency.Example
Such as, the light path of luminescent layer and reflection electrode layer can be λ/4,3 λ/4,5 λ/4,7 λ/4 etc..
As a kind of optional embodiment, the luminescent layer 12 in the Organic Light Emitting Diode 1 with micro-cavity structure includes
At least one hot activation postpones (TADF) material.Relative to traditional emitting layer material, hot activation delayed fluorescence material is in room temperature
Down the triplet excitons that originally cannot be shone can be converted to utilizable singlet exciton, therefore increase heat in luminescent layer
Activation delay material helps to realize higher luminous efficiency, while can ensure higher excitation purity.
When practical application, hot activation delay material can be added in the corresponding luminescent layer of red light-emitting wavelength, it can also
Hot activation is added in the corresponding luminescent layer of green luminescence wavelength and postpones material, it can also be corresponding luminous in blue light emitting wavelength
Hot activation is added in layer and postpones material.
Specifically, as shown in figure 4, luminescent layer 12 includes material of main part 121 and guest materials 122, material of main part 121 wraps
At least one hot activation delay material is included, guest materials 122 is fluorescent material.Be compared to it is traditional using fluorescent material both as
The material of main part of luminescent layer is used as guest materials, the embodiment of the present invention that hot activation delay material is added in material of main part again, with
Fluorescent material at room temperature can convert the triplet excitons that originally cannot be shone to as guest materials, hot activation delay material
Utilizable singlet exciton, and then improve luminous efficiency.In addition, due to the narrow spectral characteristic of fluorescent material, Ke Yibao
Demonstrate,proving the organic electroluminescence device has relatively narrow spectrum, higher excitation purity and higher gamut area.
Optionally, the material of main part 121 of luminescent layer 12 includes two kinds of hot activation delay (TADF) materials, two kinds of hot activations
Delay (TADF) material can form exciplex.Thus it can further improve the luminous efficiency of Organic Light Emitting Diode.This is
Due to being using fluorescent material as object, according to Direct Acquisition luminous mechanism, for object fluorescent material in luminescent layer
Speech, a large amount of triplet excitons cannot be utilized effectively, and the embodiment of the present invention uses two kinds of hot activation delay materials as master
Body material, and the two can form exciplex, and object thus can be inhibited to capture luminous mechanism, improve energy transfer
Efficiency further increases luminous efficiency.
Wherein, hot activation delay material can be selected from but not limited to the arbitrary heat shocks such as 4CZ-IPN, PIC-TRZ, 2PXZ-OXD
Delay material living, fluorescent material may be selected from but not limited to Alq3, C545T, DPVBi, the arbitrary fluorescent material such as DCJTB.
As a kind of optional embodiment, taken as shown in figure 5, being provided with light on the light-emitting surface of each Organic Light Emitting Diode 1
Go out layer 17.Specifically, light removing layer is arranged in Organic Light Emitting Diode on the second electrode lay, and the setting of light removing layer improves
The utilization rate of light improves the luminous efficiency of Organnic electroluminescent device.
In the present embodiment, the thickness of light removing layer 17 is preferably 20-100nm, and the refractive index of light removing layer is 1.4-3.0.
Light removing layer, which is selected from, is selected from but not limited to TAPC, NPB, TPBi etc..
As a kind of optional embodiment, as shown in fig. 6, first electrode layer 11 includes stacked reflecting layer 111 and anode
Layer 112, anode layer 112 are arranged close to luminescent layer 12.The reflecting layer 111 of the corresponding Organic Light Emitting Diode of different emission wavelengths 1
Thickness is identical, and 112 thickness of anode layer is not all the same.Reflecting layer and anode layer collectively constitute first electrode layer, on the one hand increase
The thickness of first electrode layer increases microcavity light path, and then enhances microcavity effect；On the other hand, reflecting layer is separately provided, has
The reflecting effect for helping enhance first electrode layer, further enhances microcavity effect.In addition, by the way that different anode layer thicknesses is arranged
It realizes different first electrode layer thickness, and then realizes strong to the microcavity of the corresponding Organic Light Emitting Diode of different emission wavelengths
The control of degree.
Usually, by the anode layer thickness of the corresponding Organic Light Emitting Diode of green luminescence wavelength be set greater than feux rouges and
The anode layer thickness of the corresponding Organic Light Emitting Diode of blue light emitting wavelength, the thickness by adjusting anode layer realize corresponding shine
The adjustment of the microcavity chamber length of wavelength.
Wherein, reflecting layer 111 can be metal material layer, such as metallic silver layer etc..Anode layer 112 can be high work function
Layer, such as ITO layer.
As a kind of optional embodiment, as shown in fig. 6, the second electrode lay 13 includes the metal of at least two-layer laminate setting
Oxide skin(coating) 131 and/or metal layer 132.As a result, by the way that multiple layer metal oxide or metal layer is arranged, second electrode is increased
The thickness of layer, increases light path, and then enhance microcavity effect.
For example, the second electrode lay may include one layer of metal oxide layer being stacked and one layer of metal layer；It can also
Including the two metal oxide layers being stacked；Can also include one layer of metal oxide layer, the one layer of metal being stacked
Layer and one layer of metal oxide layer, can also be other combinations, can be set according to actual demand.
Wherein, metal oxide layer 131 can be MoO3Or WO3Or IZO etc.；Metal layer 132 can be Ag or Mg etc..The
The concrete structure of two electrode layers 13 can be MoO3/Ag/MoO3Or IZO/Ag/IZO etc..
As a kind of optional embodiment, the second electrode lay 13 of the corresponding Organic Light Emitting Diode of different emission wavelengths 1
Thickness is not all the same.Specifically refer to, the metal oxide layer 131 of the corresponding Organic Light Emitting Diode of different emission wavelengths and/or
The thickness of metal layer 132 is not all the same.It can be realized not by the way that metal oxide layer and/or the metal layer of different-thickness is arranged
Different microcavity chamber length and microcavity intensity are corresponded to emission wavelength.
As a kind of optional embodiment, as shown in fig. 7, being additionally provided between first electrode layer 11 and the second electrode lay 13
Light compensation layer 15, wherein light compensation layer 15 includes hole injection layer 151, hole transmission layer 152, electronic barrier layer 153, hole
At least one of barrier layer 154, electron transfer layer 155 and electron injecting layer 156.Realizing raising gamut area as a result,
While, the efficiency of transmission of carrier is improved, and then improve the luminous efficiency of Organic Light Emitting Diode.In addition, can basis
One or two layers or more layer is arranged in actual demand, and flexibility and selectivity are strong.
For example, when first electrode layer is anode, when the second electrode lay is cathode, set between first electrode layer and luminescent layer
Set in hole injection layer, hole transmission layer and electronic barrier layer it is arbitrary one or more layers, luminescent layer and the second electrode lay it
Between in setting hole blocking layer, electron transfer layer and electron injecting layer it is arbitrary one or more layers.
It should be noted that generally can be long further to adjust microcavity chamber by adjusting the thickness of hole transmission layer, this is
Since the size of the thickness of hole transmission layer is smaller on the influence of the electric property of Organic Light Emitting Diode, in adjustment microcavity intensity
Meanwhile also ensuring good electric property.
Embodiment 1
An embodiment of the present invention provides a kind of specific examples of Organnic electroluminescent device.Organic electroluminescence in the present embodiment
Light-emitting device includes the monochromatic light Organic Light Emitting Diode of 3 kinds of emission wavelengths, and being feux rouges Organic Light Emitting Diode, green light respectively has
Machine light emitting diode and blue light organic emissive diode.Wherein, three kinds of Organic Light Emitting Diodes all have micro-cavity structure.
Each Organic Light Emitting Diode includes the first electrode layer being stacked, luminescent layer and the second electrode lay.Wherein, green
Tool is connected, transparent articulamentum between two luminescent layers by transparent articulamentum there are two luminescent layer in light Organic Light Emitting Diode
For Li2CO3/ HAT-CN/TAPC, thickness 50nm, refractive index 1.8.It is respectively provided in blue light and feux rouges Organic Light Emitting Diode
One luminescent layer.
In the present embodiment, the corresponding λ of feux rouges Organic Light Emitting Diode1=630nm, n1=2, L1=1260nm；
The corresponding λ of green light Organic Light Emitting Diode2=520nm, n2=3, L2=1560nm；
The corresponding λ of blue light organic emissive diode3=460nm, n3=2, L3=920nm.
The device architecture of feux rouges Organic Light Emitting Diode is in the present embodiment：ITO(10nm)/Ag(100nm)/ITO
(10nm)/CuPc(20nm)/TPD(200nm)/CBP:Ir(piq)3(3%, 30nm)/TPBi (40nm)/LiF (1nm)/Mg:Ag
(20%, 15nm)/NPB (60nm).
The device architecture of green light Organic Light Emitting Diode is in the present embodiment：ITO(10nm)/Ag(100nm)/ITO
(10nm)/CuPc(20nm)/TPD(100nm)/CBP:Ir(ppy)3(10%, 30nm)/TPBi (40nm)/Li2CO3(1nm)/
HAT-CN(10nm)/CuPc(20nm)/TPD(100nm)/CBP:Ir(ppy)3(3%, 30nm)/TPBi (40nm)/LiF
(1nm)/Mg:Ag (20%, 15nm)/NPB (60nm).
The device architecture of blue light organic emissive diode is ITO (10nm)/Ag (100nm)/ITO in the present embodiment
(10nm)/CuPc(20nm)/TPD(110nm)/CBP:DPVBi (3%, 30nm)/TPBi (40nm)/LiF (1nm)/Mg:Ag
(20%, 15nm)/NPB (60nm).
Embodiment 2
An embodiment of the present invention provides a kind of specific examples of Organnic electroluminescent device.Its structure is with embodiment 1, with reality
Apply example 1 offer Organnic electroluminescent device difference lies in：
Two luminescent layers are all had in feux rouges and green light Organic Light Emitting Diode, have one in blue light organic emissive diode
A luminescent layer.
The device architecture of feux rouges Organic Light Emitting Diode is in the present embodiment：ITO(10nm)/Ag(100nm)/ITO
(10nm)/CuPc(20nm)/TPD(70nm)/CBP:Ir(piq)3(3%, 30nm)/TPBi (40nm)/Li2CO3(1nm)/HAT-
CN(10nm)/CuPc(20nm)/TPD(70nm)/CBP:Ir(piq)3(3%, 30nm)/TPBi (40nm)/LiF (1nm)/Mg:
Ag (20%, 15nm)/NPB (60nm).
Embodiment 3
An embodiment of the present invention provides a kind of specific examples of Organnic electroluminescent device.Its structure is with embodiment 1, with reality
Apply example 1 offer Organnic electroluminescent device difference lies in：The thickness of green light Organic Light Emitting Diode hole-transporting layer is not
Together.
The device architecture of green light Organic Light Emitting Diode is in the present embodiment：ITO(10nm)/Ag(100nm)/ITO
(10nm)/CuPc(20nm)/TPD(30nm)/CBP:Ir(ppy)3(10%, 30nm)/TPBi (40nm)/Li2CO3(1nm)/
HAT-CN(10nm)/CuPc(20nm)/TPD(30nm)/CBP:Ir(ppy)3(3%, 30nm)/TPBi (40nm)/LiF (1nm)/
Mg:Ag (20%, 15nm)/NPB (60nm)
Embodiment 4
An embodiment of the present invention provides a kind of specific examples of Organnic electroluminescent device.Its structure is with embodiment 1, with reality
Apply example 1 offer Organnic electroluminescent device difference lies in：
Transparent articulamentum is Liq/HAT-CN/TAPC, thickness 30nm, refractive index 1.8.
Embodiment 5
An embodiment of the present invention provides a kind of specific examples of Organnic electroluminescent device.Its structure is with embodiment 1, with reality
Apply example 1 offer Organnic electroluminescent device difference lies in：
Contain a kind of hot activation in luminescent layer in three kinds of Organic Light Emitting Diodes and postpones (TADF) material.The hot activation
Delay (TADF) material is 4CZ-IPN.
Embodiment 6
An embodiment of the present invention provides a kind of specific examples of Organnic electroluminescent device.Its structure is with embodiment 1, with reality
Apply example 1 offer Organnic electroluminescent device difference lies in：
Hot activation postpones (TADF) material, two kinds of heat shocks there are two types of containing in luminescent layer in three kinds of Organic Light Emitting Diodes
Delay (TADF) material living can form exciplex.Two kinds of hot activations delay (TADF) material in the present embodiment is 4CZ-
IPN and PIC-TRZ.
Embodiment 7
An embodiment of the present invention provides a kind of specific examples of Organnic electroluminescent device.Its structure is with embodiment 1, with reality
Apply example 1 offer Organnic electroluminescent device difference lies in：
Light removing layer is different.Light removing layer is TAPC, thickness 80nm, refractive index 1.8 in the present embodiment.
Embodiment 8
An embodiment of the present invention provides a kind of specific examples of Organnic electroluminescent device.Its structure is with embodiment 1, with reality
Apply Organnic electroluminescent device that 1-7 is provided difference lies in：
In the present embodiment, the corresponding λ of feux rouges Organic Light Emitting Diode1=630nm, n1=3, L1=1890nm；
The corresponding λ of green light Organic Light Emitting Diode2=520nm, n2=4, L2=2080nm；
The corresponding λ of blue light organic emissive diode3=460nm, n3=2, L3=1260nm.
The device architecture of feux rouges Organic Light Emitting Diode is in the present embodiment：ITO(10nm)/Ag(100nm)/ITO
(10nm)/CuPc(20nm)/TPD(380nm)/CBP:Ir(piq)3(3%, 30nm)/TPBi (40nm)/LiF (1nm)/Mg:Ag
(20%, 15nm)/NPB (60nm)
The device architecture of green light Organic Light Emitting Diode is in the present embodiment：ITO(10nm)/Ag(100nm)/ITO
(10nm)/CuPc(20nm)/TPD(170nm)/CBP:Ir(ppy)3(10%, 30nm)/TPBi (40nm)/Li2CO3(1nm)/
HAT-CN(10nm)/CuPc(20nm)/TPD(170nm)/CBP:Ir(ppy)3(3%, 30nm)/TPBi (40nm)/LiF
(1nm)/Mg:Ag (20%, 15nm)/NPB (60nm)
The device architecture of blue light organic emissive diode is in the present embodiment：ITO(10nm)/Ag(100nm)/ITO
(10nm)/CuPc(20nm)/TPD(110nm)/CBP:DPVBi (3%, 30nm)/TPBi (40nm)/LiF (1nm)/Mg:Ag
(20%, 15nm)/NPB (60nm)
Embodiment 9
An embodiment of the present invention provides a kind of specific examples of Organnic electroluminescent device.Device architecture is the same as embodiment 1.With
Embodiment 1 provide Organnic electroluminescent device difference lies in：
Organnic electroluminescent device in the present embodiment is made of white organic LED, two pole of white-light organic light-emitting
Feux rouges optical filter, green light optical filter and blue filter are respectively set on the light-emitting surface of pipe.
In the present embodiment, the device architecture of white organic LED is：
ITO(10nm)/Ag(100nm)/ITO(10nm)/CuPc(20nm)/TPD(170nm)/CBP:Ir(ppy)3
(15%):Ir(piq)3(0.2%) (30nm)/TPBi (40nm)/Li2CO3(1nm)/HAT-CN(10nm)/CuPc(20nm)/
TPD(170nm)/CBP:DPVBi (3%, 30nm)/TPBi (40nm)/LiF (1nm)/Mg:Ag (20%, 15nm)/NPB (60nm)
The wavelength of feux rouges optical filter, green light optical filter and blue filter is respectively：630nm、520nm、460nm.
Embodiment 10
An embodiment of the present invention provides a kind of specific examples of Organnic electroluminescent device.Its structure is with embodiment 1, with reality
Apply example 1 offer Organnic electroluminescent device difference lies in：
Two luminescent layers, feux rouges organic light emission are all had in green light Organic Light Emitting Diode and blue light organic emissive diode
There are one luminescent layers for tool in diode.In the present embodiment, the device architecture of blue light organic emissive diode is：
ITO(10nm)/Ag(100nm)/ITO(10nm)/CuPc(20nm)/TPD(70nm)/CBP:DPVBi (3%,
30nm)/TPBi(40nm)/Li2CO3(1nm)/HAT-CN(10nm)/CuPc(20nm)/TPD(110nm)/CBP:DPVBi (3%,
30nm)/TPBi(40nm)/LiF(1nm)/Mg:Ag (20%, 15nm)/NPB (60nm)
Embodiment 11
An embodiment of the present invention provides a kind of specific examples of Organnic electroluminescent device.Its structure with embodiment 10, with
Embodiment 10 provide Organnic electroluminescent device difference lies in：
Also there are two luminescent layers for tool in feux rouges Organic Light Emitting Diode.In the present embodiment, feux rouges Organic Light Emitting Diode
Device architecture is the same as embodiment 2.
Embodiment 12
An embodiment of the present invention provides a kind of specific examples of Organnic electroluminescent device.Its structure is with embodiment 1, with reality
Apply example 1 offer Organnic electroluminescent device difference lies in：
Feux rouges and blue light organic emissive diode do not have micro-cavity structure.
Comparative example 1
This comparative example provides a kind of Organnic electroluminescent device, and structure provides organic with embodiment 1 with embodiment 1
El light emitting device difference lies in：
Transparent articulamentum is Al/Ag/HAT-CN, thickness 20nm.
Comparative example 2
This comparative example provides a kind of Organnic electroluminescent device, and structure provides organic with embodiment 1 with embodiment 1
El light emitting device difference lies in：
A luminescent layer is all had in green light, feux rouges and blue light organic emissive diode.
Comparative example 3
This comparative example provides a kind of Organnic electroluminescent device, and structure provides organic with embodiment 1 with embodiment 1
El light emitting device difference lies in：n1=n2=n3=2.
The device architecture of feux rouges Organic Light Emitting Diode is in this comparative example：ITO(10nm)/Ag(100nm)/ITO
(10nm)/CuPc(20nm)/TPD(200nm)/CBP:Ir(piq)3(3%, 30nm)/TPBi (40nm)/LiF (1nm)/Mg:Ag
(20%, 15nm)/NPB (60nm).
The device architecture of green light Organic Light Emitting Diode is in this comparative example：ITO(10nm)/Ag(100nm)/ITO
(10nm)/CuPc(20nm)/TPD(140nm)/CBP:Ir(ppy)3(3%, 30nm)/TPBi (40nm)/LiF (1nm)/Mg:Ag
(20%, 15nm)/NPB (60nm).
The device architecture of blue light organic emissive diode is in this comparative example：ITO(10nm)/Ag(100nm)/ITO
(10nm)/CuPc(20nm)/TPD(110nm)/CBP:DPVBi (3%, 30nm)/TPBi (40nm)/LiF (1nm)/Mg:Ag
(20%, 15nm)/NPB (60nm).
Comparative example 4
This comparative example provides a kind of Organnic electroluminescent device, and structure provides organic with embodiment 1 with embodiment 1
El light emitting device difference lies in：n1=n2=n3=1.
The device architecture of feux rouges Organic Light Emitting Diode is in this comparative example：ITO(10nm)/Ag(100nm)/ITO
(10nm)/CuPc(10nm)/TPD(90nm)/CBP:Ir(piq)3(3%, 20nm)/TPBi (30nm)/LiF (1nm)/Mg:Ag
(20%, 15nm)/NPB (60nm).
The device architecture of green light Organic Light Emitting Diode is in this comparative example：ITO(10nm)/Ag(100nm)/ITO
(10nm)/CuPc(10nm)/TPD(40nm)/CBP:Ir(ppy)3(3%, 20nm)/TPBi (30nm)/LiF (1nm)/Mg:Ag
(20%, 15nm)/NPB (60nm).
The device architecture of blue light organic emissive diode is in this comparative example：ITO(10nm)/Ag(100nm)/ITO
(10nm)/CuPc(10nm)/TPD(10nm)/CBP:DPVBi (3%, 20nm)/TPBi (30nm)/LiF (1nm)/Mg:Ag
(20%, 15nm)/NPB (60nm).
The performance of above-mentioned device is tested, test result is as follows shown in table：
Can be seen that Organnic electroluminescent device provided in an embodiment of the present invention from upper table data can effectively improve colour purity
Degree increases gamut area；Meanwhile Organnic electroluminescent device provided in an embodiment of the present invention can also effectively improve the luminous effect of device
Rate.
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
It changes still within the protection scope of the invention.
Claims (11)
1. a kind of Organnic electroluminescent device, which is characterized in that include the luminescence unit of m kind difference emission wavelengths, it is described to shine
Unit is monochromatic light Organic Light Emitting Diode (1) or the white organic LED (1) for being provided with optical filter (16)；
At least one Organic Light Emitting Diode (1) has micro-cavity structure；At least one emission wavelength with micro-cavity structure
Organic Light Emitting Diode (1) include at least two luminescent layers (12)；
The microcavity light path L of the Organic Light Emitting Diode (1) with the micro-cavity structure and the corresponding luminescence unit
Emission wavelength λ meet following relationship：
Li=niλi
Wherein, n >=2, n are positive integer, and the corresponding n of at least one Organic Light Emitting Diode is more than or equal to 3；M >=i >=1, i, m are
Positive integer.
2. Organnic electroluminescent device according to claim 1, which is characterized in that 577nm >=λ >=492nm, it is corresponding
The Organic Light Emitting Diode (1) includes two luminescent layers (12).
3. Organnic electroluminescent device according to claim 1 or 2, which is characterized in that the hair of different emission wavelengths
The microcavity chamber length of the corresponding Organic Light Emitting Diode of light unit (1) is not all the same.
4. according to claim 1-3 any one of them Organnic electroluminescent devices, which is characterized in that the institute of different emission wavelengths
It is not all the same to state luminescent layer (12) quantity described in the corresponding Organic Light Emitting Diode (1) of luminescence unit.
5. according to claim 1-4 any one of them Organnic electroluminescent devices, which is characterized in that the institute of different emission wavelengths
It is not all the same to state luminescent layer (12) thickness described in the corresponding Organic Light Emitting Diode (1) of luminescence unit.
6. according to claim 1-5 any one of them Organnic electroluminescent devices, which is characterized in that the luminescent layer (12) with
The light path of reflection electrode layer is λ/4 a* in the Organic Light Emitting Diode (1)；Wherein, a is odd number.
7. according to claim 1-6 any one of them Organnic electroluminescent devices, which is characterized in that each organic light emission two
Transparent articulamentum (14), the thickness of the transparent articulamentum (14) are provided in pole pipe (1) between the adjacent luminescent layer (12)
Degree is 5nm-100nm.
8. according to claim 1-7 any one of them Organnic electroluminescent devices, which is characterized in that each organic light emission two
The transparent articulamentum (14) being arranged between the adjacent luminescent layer (12) in pole pipe (1) is in metal layer, carrier functional layer
At least one or more of stepped construction.
9. according to claim 1-8 any one of them Organnic electroluminescent devices, which is characterized in that have the micro-cavity structure
The Organic Light Emitting Diode (1) in the luminescent layer (12) include at least one hot activation delay (TADF) material.
10. according to claim 1-9 any one of them Organnic electroluminescent devices, which is characterized in that the luminescent layer (12)
Include two kinds of hot activation delay (TADF) materials, two kinds of described hot activation delay (TADF) materials can form exciplex.
11. according to claim 1-10 any one of them Organnic electroluminescent devices, which is characterized in that each organic light emission
Light removing layer (17) is provided on the light-emitting surface of diode (1).
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