CN208489238U - Organnic electroluminescent device - Google Patents
Organnic electroluminescent device Download PDFInfo
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- CN208489238U CN208489238U CN201820730133.8U CN201820730133U CN208489238U CN 208489238 U CN208489238 U CN 208489238U CN 201820730133 U CN201820730133 U CN 201820730133U CN 208489238 U CN208489238 U CN 208489238U
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Abstract
The utility model relates to field of display technology, disclose a kind of Organnic electroluminescent device, the luminescence unit including m kind emission wavelength, and 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；The emission wavelength λ of the microcavity light path L of the Organic Light Emitting Diode with the micro-cavity structure and the corresponding luminescence unit 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 are positive integer.N rank microcavity effect 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, and second order microcavity, three rank microcavitys, quadravalence microcavity or higher order microcavity can be realized, enhance microcavity effect, further narrowed spectrum, and then improves gamut area.
Description
Technical field
The utility model relates to field of display technology, and in particular to a kind of Organnic electroluminescent device.
Background technique
Display of organic electroluminescence (full name in English Organic Light Emitting Display, abbreviation OLED)
It 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 passes through
Inkjet printing technology and the preparation of roll-to-roll (roll to roll) technique, it is easy to accomplish Flexible Displays are current FPD skills
Attract attention most one of technologies in art.
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) system
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, improves excitation purity 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, research and develop at high cost；In scheme two, the introducing of technology of quantum dots
Although can be improved colour gamut, it is substantially luminescence generated by light, not electroluminescent, and luminous efficiency is lower, in addition, which is also
Process complexity is improved, and is difficult to realize high density pixel arrangement.
Utility model content
For this purpose, technical problem to be solved in the utility model is that in the prior art, OLED device colour gamut is not high enough.
In order to solve the above technical problems, the technical solution adopted in the utility model is as follows:
The utility model provides a kind of Organnic electroluminescent device, the luminescence unit including m kind difference emission wavelength, institute
Stating 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；
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, 3, λ m1> λ2> λ3；And n2> n1, n2> n3。
Optionally, 577nm >=λ2>=492nm, n2≥3。
Optionally, the Organic Light Emitting Diode includes the first electrode layer being cascading, luminescent layer and second
Electrode layer forms the micro-cavity structure between the first electrode layer and the second electrode lay.
Optionally, the thickness H of luminescent layer described in each Organic Light Emitting Diode of different emission wavelengthsiMeet with
Lower relational expression: H2>H1, H2>H3。
Optionally, there is luminescent layer described at least two at least one Organic Light Emitting Diode；It is adjacent described luminous
Articulamentum is additionally provided between layer.
It optionally, include that hot activation postpones material in the luminescent layer of at least one Organic Light Emitting Diode.
Optionally, light compensation layer is additionally provided in the micro-cavity structure of at least one Organic Light Emitting Diode.
Optionally, the smooth compensation layer is hole injection layer, hole transmission layer, electronic barrier layer, hole blocking layer, electronics
At least one of transport layer and electron injecting layer.
Optionally, the first electrode layer of at least one Organic Light Emitting Diode (1) is reflection electrode layer, described second
Electrode layer is half-reflection and half-transmission electrode layer.
Optionally, the infull phase of thickness of the reflection electrode layer in each Organic Light Emitting Diode of different emission wavelengths
Together.
Optionally, the reflection electrode layer of at least one Organic Light Emitting Diode (1) includes stacked reflecting layer and sun
Pole layer；
The anode layer thickness in each Organic Light Emitting Diode of different emission wavelengths is not all the same, the reflection
Thickness degree is identical.
Optionally, the half-reflection and half-transmission electrode layer of at least one Organic Light Emitting Diode (1) include at least two layers successively
The metal oxide layer and/or metal layer being stacked.
Optionally, the light transmittance of the half-reflection and half-transmission electrode layer of at least one Organic Light Emitting Diode (1) is not less than
15%.
The technical solution of the utility model has the advantages that
Organnic electroluminescent device provided by the embodiment of the utility model, the luminescence unit including m kind difference emission wavelength,
That is the light of m kind difference emission wavelength mixes, and realizes full-color display.Wherein, luminescence unit is monochromatic light organic light emission two
Pole pipe or the white organic LED for being provided with optical filter, that is, can be a variety of monochromatic light with different emission wavelengths
Organic Light Emitting Diode is composed, and realizes full-color display；It is also possible to be composed of multiple white organic LEDs,
The light that different wave length is filtered out through optical filter is mixed into full-color display；It can also be the organic hair of monochromatic light by different emission wavelengths
Optical diode and white organic LED collectively constitute full-color display.Therefore it is suitable for different Organic Light Emitting Diodes,
Application range is wider.
Each Organic Light Emitting Diode microcavity light path L and emission wavelength λ with micro-cavity structure 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.
In the microcavity of Organic Light Emitting Diode, when the long wavelength with light wave of chamber is in the same order of magnitude, specific wavelength
Light can be selected and be reinforced, and realize spectrum narrowing, i.e. generation microcavity effect.
With the Organic Light Emitting Diode of micro-cavity structure in Organnic electroluminescent device provided by the embodiment of the utility model
Microcavity light path L be n times of its corresponding emission wavelength, i.e., can be achieved in the Organic Light Emitting Diode with micro-cavity structure
N rank microcavity effect, and n is the positive integer more than or equal to 2, and second order microcavity, three rank microcavitys, quadravalence microcavity or higher order can be realized
Microcavity enhances microcavity effect, and further narrowed spectrum, and then improves gamut area.
Organic electroluminescence device provided by the embodiment of the utility model, m 3, λ1> λ2> λ3, i.e., the organic electroluminescence send out
In electro-optical device include the Organic Light Emitting Diode of three kinds of emission wavelengths, and there is unicity, such as λ between three kinds of wavelength1For
Red light wavelength, λ2For green wavelength, λ3For blue light wavelength, full-color display is realized by traditional three primary colours.
Wherein, n2> n1, n2> n3, i.e., the intensity of the microcavity effect of the corresponding Organic Light Emitting Diode of green light is greater than feux rouges
The intensity of the microcavity effect of Organic Light Emitting Diode corresponding with blue light.This is because the chromaticity coordinates of blue-light device itself and high color
The blue light chromaticity coordinates of domain standard is closer to, and red device can realize the extension of colour gamut by spectral red shift, and green light device
Limitation of the part due to itself, it is difficult to as red device realizes the extension of colour gamut, therefore the utility model as blue-light device
Embodiment focuses on to enhance the microcavity effect of green device, is matched with the high colour gamut with red device and blue-light device, realizes
The high colour gamut of entire organic electroluminescence device.
Organnic electroluminescent device provided by the embodiment of the utility model, 577nm >=λ2>=492nm, n2>=3, i.e. green light wave
The microcavity order of long Organic Light Emitting Diode is 3 ranks or higher order, by enhancing the microcavity of green light Organic Light Emitting Diode
Intensity extends its gamut area.
Organnic electroluminescent device provided by the embodiment of the utility model, Organic Light Emitting Diode include the first stacked electricity
Pole layer, luminescent layer and the second electrode lay, since first electrode layer and the second electrode lay have corresponding transmission or reflection attribute, the
It is capable of forming above-mentioned micro-cavity structure between one electrode layer and the second electrode lay, and then colour gamut face is improved by enhancing microcavity effect
Product.
Organnic electroluminescent device provided by the embodiment of the utility model, each Organic Light Emitting Diode of different emission wavelengths
The thickness H of middle luminescent layeriMeet following relationship: H2>H1, H2>H3.It is corresponding organic pointedly to adjust green luminescence wavelength
The light emitting layer thickness of light emitting diode, be larger than the corresponding Organic Light Emitting Diode of red light-emitting wavelength light emitting layer thickness and
The light emitting layer thickness of the corresponding Organic Light Emitting Diode of blue light emitting wavelength.Microcavity order is realized by the adjusting of light emitting layer thickness
That is the adjusting of microcavity intensity improves the gamut area of the corresponding Organic Light Emitting Diode of green luminescence wavelength, guarantees entire organic
The high colour gamut of el light emitting device.
Organnic electroluminescent device provided by the embodiment of the utility model has extremely at least one Organic Light Emitting Diode
Few 2 luminescent layers, on the one hand, can be long to increase microcavity chamber by increasing the quantity of luminescent layer, and then increase light path, improve microcavity
Intensity.On the other hand, luminous flux can be effectively increased, the luminous efficiency of Organic Light Emitting Diode is improved.
Organnic electroluminescent device provided by the embodiment of the utility model, the luminescent layer of at least one Organic Light Emitting Diode
In include that hot activation postpones (TADF) material, relative to traditional emitting layer material, increase hot activation in luminescent layer and postpone material
Material helps to realize higher luminous efficiency, while can guarantee higher excitation purity.
Organnic electroluminescent device provided by the embodiment of the utility model, the microcavity knot of at least one Organic Light Emitting Diode
Light compensation layer is additionally provided in structure.It is long that the setting of light compensation layer helps to increase microcavity chamber in corresponding Organic Light Emitting Diode, i.e.,
Increase microcavity light path, and then improve microcavity order, enhance microcavity effect, so realize chromatography narrow and gamut area
Extension.
Organnic electroluminescent device provided by the embodiment of the utility model, light compensation layer are hole injection layer, hole transport
At least one of layer, electronic barrier layer, hole blocking layer, electron transfer layer and electron injecting layer.Realizing raising as a result,
While gamut area, the efficiency of transmission of carrier is improved, and then improves the luminous efficiency of Organic Light Emitting Diode.Separately
Outside, one or two layers or more can be set according to actual needs, and flexibility and selectivity are strong.
Organnic electroluminescent device provided by the embodiment of the utility model, each Organic Light Emitting Diode of different emission wavelengths
In reflection electrode layer thickness it is not all the same, can be by being set according to the attribute (such as wavelength, spectrum etc.) of different emergent lights
The reflection electrode layer of different-thickness is set, and then adjusts the light path that emergent light is propagated in microcavity, and then realize different emergent lights
Organic Light Emitting Diode corresponds to different microcavity intensity, the high colour gamut of guarantee Organnic electroluminescent device entirety and narrow spectrum.
Organnic electroluminescent device provided by the embodiment of the utility model, reflection electrode layer include stacked reflecting layer and sun
Pole layer.Reflecting layer and anode layer collectively constitute reflection electrode layer, on the one hand increase the thickness of reflection electrode layer, increase light
Journey, and then enhance microcavity effect；On the other hand, the setting in reflecting layer improves the reflecting effect of reflection electrode layer, further
Enhance microcavity effect.
Organnic electroluminescent device provided by the embodiment of the utility model, half-reflection and half-transmission electrode layer include at least two layers successively
The metal oxide layer and/or metal layer being stacked increase as a result, by setting multiple layer metal oxide or metal layer
The thickness of half-reflection and half-transmission electrode layer increases light path, and then enhances microcavity effect.
Detailed description of the invention
It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art
Specific embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, it is described below
In attached drawing be that some embodiments of the utility model are not paying creativeness for those of ordinary skill in the art
Under the premise of labour, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is existing NTSC color gamut figure；
Fig. 2 a is a kind of structural representation of embodiment of Organnic electroluminescent device provided by the embodiment of the utility model
Figure；
Fig. 2 b is a kind of structural representation of embodiment of Organnic electroluminescent device provided by the embodiment of the utility model
Figure
Fig. 3 is a kind of structural representation of embodiment of Organnic electroluminescent device provided by the embodiment of the utility model
Figure；
Fig. 4 is a kind of structural representation of embodiment of Organnic electroluminescent device provided by the embodiment of the utility model
Figure；
Fig. 5 is a kind of structural representation of embodiment of Organnic electroluminescent device provided by the embodiment of the utility model
Figure；
Fig. 6 is a kind of structural representation of embodiment of Organnic electroluminescent device provided by the embodiment of the utility model
Figure；
Fig. 7 is a kind of structural representation of embodiment of Organnic electroluminescent device provided by the embodiment of the utility model
Figure.
Appended drawing reference:
1- Organic Light Emitting Diode；101- monochromatic light Organic Light Emitting Diode；102- white organic LED；11-
First electrode layer；The reflecting layer 111-；112- anode layer；12- luminescent layer；121- articulamentum；13- the second electrode lay；131- metal
Oxide skin(coating)；132- metal layer；14- optical filter；15- light compensation layer；151- hole injection layer；152- hole transmission layer；153-
Electronic barrier layer；154- hole blocking layer；155- electron transfer layer；156- electron injecting layer.
Specific embodiment
The technical solution of the utility model is clearly and completely described below in conjunction with attached drawing, it is clear that described
Embodiment is the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, originally
Field those of ordinary skill every other embodiment obtained without making creative work belongs to practical
Novel protected range.
In the description of the present invention, it should be noted that term " first ", " second " are used for description purposes only, and
It cannot be understood as indicating or implying relative importance.
In addition, as long as technical characteristic involved in the utility model different embodiments disclosed below is each other
Not constituting conflict can be combined with each other.
The utility model embodiment provides a kind of Organnic electroluminescent device, shining including m kind difference emission wavelength
Unit, luminescence unit are monochromatic light Organic Light Emitting Diode 101 or the white organic LED for being provided with optical filter 14
102, the type of the wavelength selection optical filter of emergent light as needed is Red lightscreening plate or green light optical filter or blue filter.
The structure that luminescence unit is monochromatic light Organic Light Emitting Diode 101 is shown in Fig. 2 a；Luminescence unit is shown in Fig. 2 b as setting
There is the structure of the white organic LED 102 of optical filter 14.It is, of course, also possible to include the structure that the two is combined.
In addition, at least one Organic Light Emitting Diode 1 has micro-cavity structure.
The emission wavelength λ of the microcavity light path L of Organic Light Emitting Diode 1 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.
Organnic electroluminescent device provided by the embodiment of the utility model, the luminescence unit including m kind difference emission wavelength,
That is the light of m kind emission wavelength mixes, and realizes full-color display.Wherein, the monochromatic light organic light emission two of different emission wavelengths
Pole pipe or the white organic LED for being provided with optical filter, that is, can be a variety of monochromatic light with different emission wavelengths
Organic Light Emitting Diode is composed, and realizes full-color display, as feux rouges Organic Light Emitting Diode, green light Organic Light Emitting Diode,
Blue light organic emissive diode combinations realize full-color display；It is also possible to be composed of multiple white organic LEDs,
The light of different wave length is filtered out through optical filter, is mixed into full-color display after such as filtering out feux rouges, green light, blue light；It can also be by difference
The monochromatic light Organic Light Emitting Diode and white organic LED of emission wavelength collectively constitute full-color display.Therefore it is suitable for
Different types of Organic Light Emitting Diode, application range are wider.
Each Organic Light Emitting Diode microcavity light path L and emission wavelength λ with micro-cavity structure 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.
In the microcavity of Organic Light Emitting Diode, when chamber is long and the wavelength of luminous wave is in the same order of magnitude, specific wavelength
Light can be selected and be reinforced, realize spectrum narrowing, i.e., generation microcavity effect.
With the Organic Light Emitting Diode of micro-cavity structure in Organnic electroluminescent device provided by the embodiment of the utility model
Microcavity light path L be n times of its corresponding emission wavelength, i.e., can be achieved in the Organic Light Emitting Diode with micro-cavity structure
N rank microcavity effect, and n is the positive integer more than or equal to 2, and second order microcavity, three rank microcavitys, quadravalence microcavity or higher order can be realized
Microcavity enhances microcavity effect, and further narrowed spectrum, and then improves gamut area.
Preferably, niNot all the same, i.e., order, that is, intensity of microcavity effect is not all the same in each Organic Light Emitting Diode, i.e.,
The order 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 optimal gamut area.
As a kind of optional embodiment, m 3, λ1> λ2> λ3；And n2> n1, n2> n3。
As a kind of optional embodiment, i=2 corresponding is green light Organic Light Emitting Diode.
That is, including the emergent light of three kinds of wavelength in the Organnic electroluminescent device, and have between three kinds of wavelength single
Property.Such as λ1For red light wavelength, wave-length coverage 600nm-760nm；λ2For green wavelength, wave-length coverage 492nm-577nm；
λ3For blue light wavelength, wave-length coverage 435-480nm.Full-color display is realized by traditional RGB three primary colours.Wherein, same picture
In plain unit, the quantity of Organic Light Emitting Diode 1 is generally three, respectively corresponds the emergent light of three of the above wavelength；Organic hair
The quantity of optical diode 1 can also be more than or less than three, and permutation and combination method can be set according to actual needs, herein not
Do concrete restriction.Following associated description is by taking m=3 as an example.
Wherein, n2> n1, n2> n3, i.e. the intensity of the microcavity effect of the corresponding Organic Light Emitting Diode 1 of green luminescence wavelength
The intensity of the microcavity effect of Organic Light Emitting Diode 1 corresponding greater than red light-emitting wavelength and blue light emitting wavelength is corresponding has
The intensity of the microcavity effect of machine light emitting diode 1, this is because the blue light of the chromaticity coordinates of blue-light device itself and high gamut standards
Chromaticity coordinates is closer to, and red device can realize the extension of colour gamut by spectral red shift, and green device due to itself
Limitation, it is difficult to which as red device realizes the extension of colour gamut as blue-light device, therefore the utility model embodiment emphatically will
The microcavity effect of green device enhances, and is matched with the high colour gamut with red device and blue-light device, realizes entire organic electroluminescence
The high colour gamut of light emitting device.
For example, 3 ranks, feux rouges can be set by the microcavity order of the corresponding Organic Light Emitting Diode of green luminescence wavelength
The microcavity order of the corresponding Organic Light Emitting Diode of emission wavelength and the corresponding Organic Light Emitting Diode of blue light emitting wavelength is all provided with
It is set to 2 ranks；Or the microcavity order of the corresponding Organic Light Emitting Diode of green luminescence wavelength can be set to 4 ranks, feux rouges hair
The microcavity order of the corresponding Organic Light Emitting Diode of optical wavelength is set as 3 ranks, the corresponding organic light-emitting diodes of blue light emitting wavelength
The microcavity order of pipe is set as 2 ranks.It can specifically be configured according to actual needs, not do excessive limitation herein.
As a kind of optional embodiment, 577nm >=λ2>=492nm, n2≥3.That is the corresponding organic light emission two of green wavelength
The microcavity order of pole pipe is 3 ranks or higher order, significantly enhances the microcavity intensity of green light Organic Light Emitting Diode, extends its color
Domain area.
As a kind of optional embodiment, Organic Light Emitting Diode 1 includes the first electrode layer 11 being cascading, hair
Photosphere 12 and the second electrode lay 13, form micro-cavity structure between first electrode layer 11 and the second electrode lay 13.
L is specifically referred to, and the light that luminescent layer issues is reflected by first electrode layer, is reflected, is returned to using the second electrode lay
It is equivalent caused by the distance and first electrode layer and the reflection phase shift of the second electrode lay that initial position is propagated during this
Distance.Wherein, the distance of propagation is generally twice of the thickness of each layer that light is passed through and the sum of products of corresponding refractive index.
Since first electrode layer and the second electrode lay have corresponding transmission or reflection attribute, first electrode layer and the second electricity
It is capable of forming above-mentioned micro-cavity structure between the layer of pole, and then gamut area is improved by enhancing microcavity effect.
When Organic Light Emitting Diode 1 is monochromatic light Organic Light Emitting Diode 101, luminescent layer 12 is monochromatic luminescent layer, example
Such as red light luminescent layer or blue light-emitting or green light emitting layer, when Organic Light Emitting Diode 1 is white organic LED 102
When, luminescent layer is usually the stepped construction of three luminescent layers of RGB, and luminescent layer 12 issues white light, through being respectively set thereon
Optical filter by the light of specific wavelength filter out after realize colorful light-emitting.
As a kind of optional embodiment, as shown in figure 3, shining in each Organic Light Emitting Diode 1 of different emission wavelengths
The thickness H of layer 12iMeet following relationship: H2>H1, H2>H3.Pointedly adjust the corresponding organic light emission of green luminescence wavelength
The light emitting layer thickness of diode 1 is larger than the light emitting layer thickness and indigo plant of the corresponding Organic Light Emitting Diode 1 of red light-emitting wavelength
The light emitting layer thickness of the corresponding Organic Light Emitting Diode 1 of light emission wavelength.Microcavity order is realized by the adjusting of light emitting layer thickness
That is the adjusting of microcavity intensity improves the gamut area of the corresponding Organic Light Emitting Diode of green luminescence wavelength, guarantees entire organic
The high colour gamut of el light emitting device.
As a kind of optional embodiment, as shown in figure 4, having at least two hair at least one Organic Light Emitting Diode 1
Photosphere 12；Articulamentum 121 is additionally provided between adjacent emissive layers 12.On the one hand, can be increased by increasing the quantity of luminescent layer
Microcavity chamber is long, and then increases light path, improves microcavity intensity.On the other hand, luminous flux can be effectively increased, organic light-emitting diodes are improved
The luminous efficiency of pipe.
Such as set 2 for the luminous layer number in the corresponding Organic Light Emitting Diode of green luminescence wavelength, feux rouges and
Luminous layer number in the corresponding Organic Light Emitting Diode of blue light emitting wavelength is disposed as 1.
The articulamentum 121 for connecting adjacent emissive layers 12 is hyaline layer, is selected from but not limited to Li2CO3、 HAT-CN、TAPC、
Li2CO3, one of materials such as HAT-CN, TAPC:HAT-CN, Ag, ITO be formed by film layer, be also possible to multilayer laminated multiple
Structure is closed, for example, the Li being stacked2CO3/ HAT-CN/TAPC etc..Transparent articulamentum 14 with a thickness of 5nm-100nm；Refraction
Rate is generally 1.6-2.2.
As a kind of optional embodiment, prolong in the luminescent layer 12 of at least one Organic Light Emitting Diode 1 including hot activation
(TADF) material late.Relative to traditional emitting layer material, increasing hot activation delay (TADF) material in luminescent layer facilitates
It realizes higher luminous efficiency, while can guarantee higher excitation purity.It, can be corresponding in red light-emitting wavelength when practical application
Luminescent layer in be added hot activation postpone material, can also be added in the corresponding luminescent layer of green luminescence wavelength hot activation postpone
Hot activation delay material can also be added in material in the corresponding luminescent layer of blue light emitting wavelength.
It include material of main part and guest materials in luminescent layer in the present embodiment, material of main part includes at least one hot activation
Postpone material, guest materials is fluorescent material.Be compared to it is traditional using fluorescent material not only as the material of main part of luminescent layer but also
As guest materials, hot activation delay material is added in the utility model embodiment in material of main part, using fluorescent material as visitor
Body material, hot activation delay material can convert utilizable single line for the triplet excitons that originally cannot be shone at room temperature
State exciton, and then improve luminous efficiency.In addition, due to the narrow spectral characteristic of fluorescent material, it is ensured that organic electroluminescence hair
Optical device has relatively narrow spectrum, higher excitation purity and higher gamut area.
As a kind of optional embodiment, material of main part includes that two kinds of hot activations postpone material, and two kinds of hot activations postpone material
Material can form exciplex.Thus it can further improve the luminous efficiency of Organic Light Emitting Diode.This is because in luminescent layer
Be using fluorescent material as object, therefore according to Direct Acquisition luminous mechanism, for object fluorescent material, a large amount of three line
State exciton cannot be utilized effectively, and the utility model embodiment uses two kinds of hot activation delay materials as material of main part, and
And the two is capable of forming exciplex, and object thus can be inhibited to capture luminous mechanism, energy transfer efficiency is improved, into one
Step improves luminous efficiency.
Wherein, hot activation delay material can be selected from but not limited to 4CzIPN, 2CzPN, 4CzPN, 4CzTPN, 4CzTPN-
Any hot activation such as Me, 4CzTPN-Ph postpones material, and fluorescent material, which is selected from, is not limited to Alq3, C545T, DPVBi, and DCJTB etc. appoints
Meaning fluorescent material.
As a kind of optional embodiment, as shown in figure 5, in the micro-cavity structure of at least one Organic Light Emitting Diode 1 also
It is provided with light compensation layer 15.The structure of an Organic Light Emitting Diode is illustrated only in Fig. 5.The setting of light compensation layer helps to increase
Add microcavity chamber in corresponding Organic Light Emitting Diode long, that is, increase microcavity light path, and then improve microcavity order, enhances microcavity
Effect, and then realize the extension of chromatography to narrow with gamut area.
As a kind of optional embodiment, as shown in figure 5, light compensation layer 15 is hole injection layer 151, hole transmission layer
152, at least one of electronic barrier layer 153, hole blocking layer 154, electron transfer layer 155 and electron injecting layer 156.By
This improves the efficiency of transmission of carrier, and then improve Organic Light Emitting Diode while realizing raising gamut area
Luminous efficiency.In addition, one or two layers or more can be arranged according to actual needs, flexibility and selectivity are strong.
For example, when first electrode layer 11 is anode, when the second electrode lay 13 is cathode, in first electrode layer 11 and luminescent layer
Be arranged between 12 hole injection layer 151, in hole transmission layer 152 and electronic barrier layer 153 it is any one or more layers, shining
It is arranged between layer 12 and the second electrode lay 13 any in hole blocking layer 154, electron transfer layer 155 and electron injecting layer 156
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.
As a kind of optional embodiment, first electrode layer 11 is reflection electrode layer, and the second electrode lay 13 is half-reflection and half-transmission
Electrode layer.That is, using the reflection characteristic of first electrode layer and the half-reflection and half-transmission characteristic of the second electrode lay, in first electrode layer and
Micro-cavity structure is formed between the second electrode lay.
As a kind of optional embodiment, reflection electrode layer in each Organic Light Emitting Diode 1 of different emission wavelengths
Thickness is not all the same.The reflection according to the attribute (such as wavelength, spectrum etc.) of different emergent lights setting different-thickness can be passed through
Electrode layer, and then the light path that emergent light is propagated in microcavity is adjusted, and then realize the Organic Light Emitting Diode pair of different emergent lights
Answer different microcavity intensity, the high colour gamut of guarantee Organnic electroluminescent device entirety and narrow spectrum.
As a kind of optional embodiment, as shown in fig. 6, reflection electrode layer includes stacked reflecting layer 111 and anode layer
112.Reflecting layer 111 and anode layer 112 collectively constitute reflection electrode layer, on the one hand increase the thickness of reflection electrode layer, increase
Light path, and then enhance microcavity effect；On the other hand, the setting in reflecting layer improves the reflecting effect of reflection electrode layer, into
One step enhances microcavity effect.
In the present embodiment, 112 thickness of anode layer in each Organic Light Emitting Diode 1 of different emission wavelengths is not all the same,
111 thickness of reflecting layer is identical.Generally, it sets the anode layer thickness of the corresponding Organic Light Emitting Diode of green luminescence wavelength to
It is real by the thickness for adjusting anode layer greater than the anode layer thickness of feux rouges and the corresponding Organic Light Emitting Diode of blue light emitting wavelength
Now correspond to the long adjustment of the microcavity chamber of emission wavelength.
Wherein, reflecting layer 111 can be metal material layer, such as metallic silver layer etc..Anode layer 112 can be high work content
Several layers, such as ITO layer.
As a kind of optional embodiment, as shown in fig. 7, half-reflection and half-transmission electrode layer is cascading including at least two layers
Metal oxide layer 131 or metal layer 132.Specifically, half-reflection and half-transmission electrode layer may include one layer to be cascading
Metal oxide layer 131 and one layer of metal layer 132；It also may include the two metal oxide layers 131 being cascading；?
It may include one layer of metal oxide layer, 131, the one layers of metal layer 132 and one layer of metal oxide layer being cascading
131, it can also be other combinations, can set according to actual needs.As a result, by setting multiple layer metal oxide skin(coating) and/
Or metal layer, the thickness of half-reflection and half-transmission electrode layer is increased, increases light path, and then enhance microcavity effect.
In the present embodiment, metal oxide layer 131 can be MoO3Or WO3Or IZO etc.；Metal layer 132 can be Ag or Mg
Deng.
As a kind of optional embodiment, the light transmittance of half-reflection and half-transmission electrode layer is not less than 15%, and refractive index is greater than 1 and small
In 2.
Embodiment 1
The utility model embodiment provides a kind of specific example of Organnic electroluminescent device.It is organic in the present embodiment
El light emitting device includes the monochromatic light Organic Light Emitting Diode of 3 kinds of emission wavelengths, is feux rouges Organic Light Emitting Diode respectively, green
Light Organic Light Emitting Diode and blue light organic emissive diode.Wherein, three kinds of Organic Light Emitting Diodes all have micro-cavity structure.The
The light transmittance of two electrode layers is 35%.
In the present embodiment, the corresponding λ of feux rouges Organic Light Emitting Diode1=630nm, n1=2, L1=1260 nm；
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 in the present embodiment are as follows: ITO (10nm)/Ag (100 nm)/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 in the present embodiment are as follows: ITO (10nm)/Ag (100 nm)/ITO
(10nm)/CuPc(20nm)/TPD(280nm)/CBP:Ir(ppy)3(10%, 30nm)/TPBi (40nm)/LiF (1nm)/Mg:
Ag (20%, 15nm)/NPB (60nm).
The device architecture of blue light organic emissive diode in the present embodiment are as follows: ITO (10nm)/Ag (100 nm)/ITO
(10nm)/CuPc (20nm)/TPD (110nm)/CBP:DPVBi (3%, 30nm)/TPBi (40nm)/LiF (1nm)/Mg:Ag
(20%, 15nm)/NPB (60nm).
Wherein, the hole transmission layer TPD thickness of green light Organic Light Emitting Diode is greater than two pole of feux rouges and blue light organic emissive
The light emitting layer thickness of pipe.
Embodiment 2
The utility model embodiment provides a kind of specific example of Organnic electroluminescent device.It is provided with embodiment 1
The difference of Organnic electroluminescent device is, but the luminous layer number of green light Organic Light Emitting Diode is two, two luminescent layers
Between be provided with articulamentum.
In the present embodiment, the device architecture of green light Organic Light Emitting Diode are as follows: ITO (10nm)/Ag (100 nm)/ITO
(10nm)/CuPc(20nm)/TPD(90nm)/CBP:Ir(ppy)3(10%, 30nm)/TPBi (40nm)/Li2CO3(1nm)/
HAT-CN(10nm)/CuPc(20nm)/TPD(90nm)/CBP: Ir(ppy)3(3%, 30nm)/TPBi (40nm)/LiF
(1nm)/Mg:Ag (20%, 15nm)/NPB (60 nm).
Embodiment 3
The utility model embodiment provides a kind of specific example of Organnic electroluminescent device.It is provided with embodiment 1
The difference of Organnic electroluminescent device be, hot activation delay (TADF) is included in the luminescent layer of green light Organic Light Emitting Diode
Material.
In the present embodiment, the device architecture of green light Organic Light Emitting Diode are as follows: ITO (10nm)/Ag (100 nm)/ITO
(10nm)/CuPc (20nm)/TPD (280nm)/4CzIPN:Ir (ppy)3(10%) (30 nm)/TPBi (40nm)/LiF
(1nm)/Mg:Ag (20%, 15nm)/NPB (60nm).
Embodiment 4
The utility model embodiment provides a kind of specific example of Organnic electroluminescent device.It is provided with embodiment 1
The difference of Organnic electroluminescent device is:
In the present embodiment, the anode layer in green light Organic Light Emitting Diode first electrode is optical compensating layer.
The device architecture of green light Organic Light Emitting Diode in the present embodiment are as follows: ITO (10nm)/Ag (100 nm)/ITO
(180nm)/CuPc(20nm)/TPD(100nm)/CBP:Ir(ppy)3(10%, 30 nm)/TPBi (40nm)/LiF (1nm)/
Mg:Ag (20%, 15nm)/NPB (60nm)
Embodiment 5
The utility model embodiment provides a kind of specific example of Organnic electroluminescent device.It is provided with embodiment 1
The difference of Organnic electroluminescent device is:
The second electrode lay of the Organic Light Emitting Diode of green luminescence wavelength includes three layers of metal oxygen being cascading
Compound layer and metal layer.
The device architecture of green light Organic Light Emitting Diode in the present embodiment are as follows: ITO (10nm)/Ag (100 nm)/ITO
(10nm)/CuPc(20nm)/TPD(280nm)/CBP:Ir(ppy)3(10%, 30nm)/TPBi (40nm)/LiF (1nm)/Mg:
Ag (20%, 10nm)/MoO3 (60nm)/Mg:Ag (20%, 10nm)/MoO3 (60nm)
Embodiment 6
The utility model embodiment provides a kind of specific example of Organnic electroluminescent device.Its structure with embodiment 1,
Wherein, the second electrode lay Mg；Ag is with a thickness of 25nm, light transmittance 15%.
Embodiment 7
The utility model embodiment provides a kind of specific example of Organnic electroluminescent device.It is provided with embodiment 1
The difference of Organnic electroluminescent device is:
In the present embodiment, the corresponding λ of feux rouges Organic Light Emitting Diode1=630nm, n1=3, L1=1890 nm；
The corresponding λ of green light Organic Light Emitting Diode2=520nm, n2=4, 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 in the present embodiment are as follows: ITO (10nm)/Ag (100 nm)/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 in the present embodiment are as follows: ITO (10nm)/Ag (100 nm)/ITO
(10nm)/CuPc(20nm)/TPD(430nm)/CBP:Ir(ppy)3(10%, 30nm)/TPBi (40nm)/LiF (1nm)/Mg:
Ag (20%, 15nm)/NPB (60nm).
The device architecture of blue light organic emissive diode in the present embodiment are as follows: ITO (10nm)/Ag (100 nm)/ITO
(10nm)/CuPc (20nm)/TPD (110nm)/CBP:DPVBi (3%, 30nm)/TPBi (40nm)/LiF (1nm)/Mg:Ag
(20%, 15nm)/NPB (60nm).
Embodiment 8
The utility model embodiment provides a kind of specific example of Organnic electroluminescent device.The same embodiment of device architecture
1。
The difference of the Organnic electroluminescent device provided with embodiment 1 is:
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 are as follows:
Red light unit: ITO (10nm)/Ag (100nm)/ITO (100nm)/CuPc (20nm)/TPD (20 nm)/CBP:Ir
(ppy) 3 (15%): Ir (piq) 3 (0.2%) (30nm)/TPBi (30nm)/Li2CO3 (1nm)/HAT-CN (10nm)/CuPc
(20nm)/TPD (20nm)/CBP:DPVBi (3%, 30 nm)/TPBi (30nm)/LiF (1nm)/Mg:Ag (20%, 15nm)/
NPB(60nm)；
Green light unit: ITO (10nm)/Ag (100nm)/ITO (180nm)/CuPc (20nm)/TPD (20 nm)/CBP:Ir
(ppy) 3 (15%): Ir (piq) 3 (0.2%) (30nm)/TPBi (30nm)/Li2CO3 (1nm)/HAT-CN (10nm)/CuPc
(20nm)/TPD (20nm)/CBP:DPVBi (3%, 30 nm)/TPBi (30nm)/LiF (1nm)/Mg:Ag (20%, 15nm)/
NPB(60nm)；
Blue light unit: ITO (10nm)/Ag (100nm)/ITO (10nm)/CuPc (20nm)/TPD (20 nm)/CBP:Ir
(ppy) 3 (15%): Ir (piq) 3 (0.2%) (30nm)/TPBi (30nm)/Li2CO3 (1nm)/HAT-CN (10nm)/CuPc
(20nm)/TPD (20nm)/CBP:DPVBi (3%, 30 nm)/TPBi (30nm)/LiF (1nm)/Mg:Ag (20%, 15nm)/
NPB(60nm)；
The wavelength of feux rouges optical filter, green light optical filter and blue filter is respectively as follows: 630nm, 522nm and 456nm.
Embodiment 9
The utility model embodiment provides a kind of specific example of Organnic electroluminescent device.The same embodiment of device architecture
1.The difference of the Organnic electroluminescent device provided with embodiment 1 is:
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 with embodiment 1, difference is device architecture, n1=n2=
n3=2.
The device architecture of feux rouges Organic Light Emitting Diode in the present embodiment are as follows: ITO (10nm)/Ag (100 nm)/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 in the present embodiment are as follows: ITO (10nm)/Ag (100 nm)/ITO
(10nm)/CuPc(20nm)/TPD(130nm)/CBP:Ir(ppy)3(10%, 30nm)/TPBi (40nm)/LiF (1nm)/Mg:
Ag (20%, 15nm)/NPB (60nm).
The device architecture of blue light organic emissive diode in the present embodiment are as follows: ITO (10nm)/Ag (100 nm)/ITO
(10nm)/CuPc (20nm)/TPD (110nm)/CBP:DPVBi (3%, 30nm)/TPBi (40nm)/LiF (1nm)/Mg:Ag
(20%, 15nm)/NPB (60nm).
Comparative example 2
This comparative example provides a kind of Organnic electroluminescent device, and with embodiment 1, difference is device architecture, n1=n2=
n3=1.
The device architecture of feux rouges Organic Light Emitting Diode in the present embodiment are as follows: ITO (10nm)/Ag (100 nm)/ITO
(10nm)/CuPc(20nm)/TPD(20nm)/CBP:Ir(piq)3(3%, 30nm)/TPBi (40 nm)/LiF (1nm)/Mg:Ag
(20%, 15nm)/NPB (60nm)；
The device architecture of green light Organic Light Emitting Diode in the present embodiment are as follows: ITO (10nm)/Ag (100 nm)/ITO
(10nm)/CuPc(20nm)/TPD(20nm)/CBP:Ir(ppy)3(10%, 30nm)/TPBi (20nm)/LiF (1nm)/Mg:
Ag (20%, 15nm)/NPB (60nm)；
The device architecture of blue light organic emissive diode in the present embodiment are as follows: ITO (10nm)/Ag (100 nm)/ITO
(10nm)/CuPc (10nm)/TPD (20nm)/CBP:DPVBi (3%, 20nm)/TPBi (20 nm)/LiF (1nm)/Mg:Ag
(20%, 15nm)/NPB (60nm).
Comparative example 3
This comparative example provides a kind of specific example of Organnic electroluminescent device.Device architecture exists with embodiment 1, difference
In the second electrode lay Mg；Ag is with a thickness of 40nm, light transmittance 10%.Light transmittance is 10%, Mg:Ag with a thickness of 40nm.
The performance of above-mentioned device is tested, test result is as follows shown in table:
It can be seen that the utility model embodiment by adjusting microcavity light path, using high-order micro-cavity structure from upper table data
Excitation purity and gamut area can be significantly improved, the device gamut area of optimization is able to maintain simultaneously close to 100% BT.2020
High device efficiency.
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 among the protection scope created still in the utility model.
Claims (10)
1. a kind of Organnic electroluminescent device, which is characterized in that the luminescence unit including m kind difference emission wavelength, it is described to shine
Unit is monochromatic light Organic Light Emitting Diode (101) or the white organic LED (102) for being provided with optical filter (14)；
At least one Organic Light Emitting Diode (1) has micro-cavity structure；
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 Organic Light Emitting Diode (1) packet
Include the first electrode layer (11) being stacked, luminescent layer (12) and the second electrode lay (13), the first electrode layer (11) and
The micro-cavity structure is formed between the second electrode lay (13).
3. Organnic electroluminescent device according to claim 2, which is characterized in that different emission wavelengths it is each described organic
The thickness H of luminescent layer (12) described in light emitting diode (1)iMeet following relationship: H2>H1, H2>H3。
4. Organnic electroluminescent device according to claim 2, which is characterized in that at least one organic light-emitting diodes
Managing has luminescent layer (12) described at least two in (1)；Articulamentum (121) are additionally provided between the adjacent luminescent layer (12).
5. Organnic electroluminescent device according to claim 2, which is characterized in that at least one organic light-emitting diodes
It manages in the micro-cavity structure of (1) and is additionally provided with light compensation layer (15).
6. Organnic electroluminescent device according to claim 5, which is characterized in that the smooth compensation layer (15) is hole note
Enter layer (151), hole transmission layer (152), electronic barrier layer (153), hole blocking layer (154), electron transfer layer (155) and
At least one of electron injecting layer (156).
7. Organnic electroluminescent device according to claim 1-6, which is characterized in that at least one described organic
The first electrode layer (11) of light emitting diode (1) is reflection electrode layer, and the second electrode lay (13) is half-reflection and half-transmission electrode layer.
8. Organnic electroluminescent device according to claim 7, which is characterized in that different emission wavelengths it is each described organic
The thickness of reflection electrode layer in light emitting diode (1) is not all the same.
9. Organnic electroluminescent device according to claim 8, which is characterized in that different emission wavelengths it is each described organic
Reflection electrode layer in light emitting diode (1) includes stacked reflecting layer (111) and anode layer (112)；
The anode layer (112) thickness in each Organic Light Emitting Diode (1) of different emission wavelengths is not all the same, described
Reflecting layer (111) thickness is identical.
10. Organnic electroluminescent device according to claim 7, which is characterized in that each of different emission wavelengths described has
Half-reflection and half-transmission electrode layer in machine light emitting diode (1) includes at least two layers metal oxide layer (131) being cascading
And/or metal layer (132).
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| CN108511628A (en) * | 2018-05-16 | 2018-09-07 | 云谷（固安）科技有限公司 | Organnic electroluminescent device |
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