CN108987594A - A kind of organic electroluminescent LED and Organnic electroluminescent device - Google Patents
A kind of organic electroluminescent LED and Organnic electroluminescent device Download PDFInfo
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- CN108987594A CN108987594A CN201810714145.6A CN201810714145A CN108987594A CN 108987594 A CN108987594 A CN 108987594A CN 201810714145 A CN201810714145 A CN 201810714145A CN 108987594 A CN108987594 A CN 108987594A
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- H—ELECTRICITY
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- 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
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- H—ELECTRICITY
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- 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
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
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Abstract
The invention discloses a kind of organic electroluminescent LEDs, including first electrode, the first carrier functional layer, at least two layers of blue light-emitting, the second carrier functional layer and the second electrode stacked gradually；Blue light-emitting includes the phosphorescence luminescent layer close to the first carrier functional layer and the fluorescent light-emitting layer close to the second carrier functional layer；For the energy level potential barrier of first carrier functional layer and phosphorescence luminescent layer less than the energy level potential barrier of the second carrier functional layer and fluorescent light-emitting layer, the carrier mobility of phosphorescence luminescent layer is less than the carrier mobility of fluorescent light-emitting layer.Organic electroluminescent LED issues blue phosphorescent by phosphorescence luminescent layer at low voltage, issues blue-fluorescence by fluorescent light-emitting layer under high voltages, improves its luminous efficiency.The present invention provides a kind of Organnic electroluminescent device, and wherein blue subpixels unit is above-mentioned organic electroluminescent LED, and the balanced device luminous efficiency between each sub-pixel unit at low voltage improves device colour cast.
Description
Technical field
The invention belongs to field of display technology, and in particular to a kind of organic electroluminescent LED and organic electroluminescent dress
It sets.
Background technique
Organic electroluminescent LED (full name in English Organic Light Emitting Display, abbreviation OLED) is
Active luminous display unit, since it has many advantages, such as simple preparation process, at low cost, high contrast, wide viewing angle, low-power consumption,
It is expected to become next-generation mainstream flat panel display, is most one of technology that attracts attention in current flat panel display.
The monochromatic display for obtaining efficient red, green, blue three primary colours is to realize that full color shows indispensable a part.
The property so that red, green monochromatic organic electroluminescence device is found by research and development in more than 20 years, especially phosphor material
The standard of practical application can be had reached, however since the absorption spectrum wave-length coverage of blue light is shorter, blue organic electroluminescent
The greater band gap of material, it is desirable that the radioluminescence of blue light material needs to obtain more energy, the brightness of blue-light device, efficiency,
Service life is still poor, and performance is to be improved.
On the other hand, Fig. 1 shows the voltage-brightness curve graph of tri- sub-pixels of RGB in existing display device, can by figure
Know, in existing OLED display device, tri- sub-pixels of RGB open bright voltage be it is inconsistent, specifically, blue light sub-pixel
Bright voltage be greater than green light sub-pixel bright voltage be greater than feux rouges pixel bright voltage.When practical application, blue light is lighted
When sub-pixel, although voltage mainly across on blue subpixels, since the electric conductivity of public hole injection layer is preferable,
Therefore portion voltage can be applied in green light sub-pixel and/or feux rouges sub-pixel by public hole injection layer, due to feux rouges
The bright voltage of sub-pixel and green light sub-pixel is respectively less than the bright voltage of blue light sub-pixel, therefore feux rouges sub-pixel and/or green
Sub-pixels are easily lighted simultaneously, i.e., in low ash rank, feux rouges sub-pixel and/or the brightness of green light sub-pixel for emitting light cannot be tight
Lattice reach low-light level display effect as requested, and low ash rank colour cast (partially red or partially green) phenomenon occur.
Summary of the invention
For this purpose, first technical problem to be solved by this invention be blue-light device in the prior art luminous efficiency it is low
Defect.
In order to solve the above technical problems, The technical solution adopted by the invention is as follows:
The present invention provides a kind of organic electroluminescent LEDs, including first electrode, the first load being cascading
Flow subfunction layer, at least two layers of blue light-emitting, the second carrier functional layer and second electrode；The blue light-emitting includes leaning on
The phosphorescence luminescent layer of the nearly first carrier functional layer setting, and the fluorescence hair close to the second carrier functional layer setting
Photosphere；
Energy level potential barrier between the first carrier functional layer and the phosphorescence luminescent layer material of main part is less than described the
The carrier of energy level potential barrier between two carrier functional layers and the fluorescent light-emitting layer material of main part, the phosphorescence luminescent layer moves
Shifting rate is less than the carrier mobility of the fluorescent light-emitting layer.
Preferably, above-mentioned organic electroluminescent LED, the first electrode are anode, and the second electrode is yin
Pole；The energy level potential barrier of the HOMO energy level of the HOMO energy level of the first carrier functional layer and the phosphorescence luminescent layer material of main part
ΔEh1, less than the energy level of the LOMO energy level of the LOMO energy level and fluorescent light-emitting layer material of main part of the second current-carrying subfunction
Potential barrier Δ Ee1。
It is further preferred that above-mentioned organic electroluminescent LED, the first carrier functional layer is hole injection
One of layer, hole transmission layer and electronic barrier layer, the second carrier functional layer are electron injecting layer, electron transfer layer
One of with hole blocking layer.
Preferably, above-mentioned organic electroluminescent LED, the first carrier functional layer is electronic barrier layer, described
Second carrier functional layer is hole blocking layer.
Preferably, above-mentioned organic electroluminescent LED, the first electrode are cathode, and the second electrode is sun
Pole；The energy level potential barrier of the lumo energy of the lumo energy of the first carrier functional layer and the phosphorescence luminescent layer material of main part
ΔEe2, less than the energy level of the HOMO energy level of the HOMO energy level and fluorescent light-emitting layer material of main part of the second current-carrying subfunction
Potential barrier Δ Eh2。
It is further preferred that above-mentioned organic electroluminescent LED, the first carrier functional layer is electron injection
One of layer, electron transfer layer and hole blocking layer, the second carrier functional layer are hole injection layer, hole transmission layer
One of with electronic barrier layer.
Preferably, above-mentioned organic electroluminescent LED, the first carrier functional layer is hole blocking layer, described
Second carrier functional layer is electronic barrier layer.
Preferably, above-mentioned organic electroluminescent LED, the first carrier functional layer and the first electrode it
Between be additionally provided with third carrier functional layer；And/or it is also set up between the second carrier functional layer and the second electrode
There is the 4th carrier functional layer.
Preferably, above-mentioned organic electroluminescent LED, the phosphorescence luminescent layer open bright voltage lower than the fluorescence
Luminescent layer opens bright voltage.
Second technical problem to be solved by this invention is that OLED display easily goes out in low-light level in the prior art
The defect of existing colour cast.
In order to solve the above technical problems, The technical solution adopted by the invention is as follows:
The present invention provides a kind of Organnic electroluminescent devices, several pixel units including array distribution, the pixel
It include feux rouges sub-pixel unit, green light sub-pixel unit and blue light sub-pixel unit in unit, the blue light sub-pixel unit is
Above-mentioned organic electroluminescent LED.
Technical solution of the present invention has the advantages that
1, organic electroluminescent LED provided by the invention, including be stacked first electrode, the first carrier function
Ergosphere, at least two layers of blue light-emitting, the second carrier functional layer and second electrode；The blue light-emitting includes close to described
The phosphorescence luminescent layer of first carrier functional layer setting, and the fluorescent light-emitting layer close to the second carrier functional layer setting；
Energy level potential barrier between the first carrier functional layer and the phosphorescence luminescent layer is less than second carrier
The carrier mobility of energy level potential barrier between functional layer and the fluorescent light-emitting layer material of main part, the phosphorescence luminescent layer is less than
The carrier mobility of the fluorescent light-emitting layer.
In organic electroluminescent LED, the injection efficiency of carrier is by luminescent layer and adjacent carrier in luminescent layer
Carrier mobility in energy level potential barrier and carrier functional layer between functional layer material of main part determines.Wherein, luminescent layer
Energy level potential barrier between material of main part and adjacent carrier functional layer is smaller, is more conducive to carrier and injects into luminescent layer；And
At low voltage, the influence that energy level potential barrier injects carrier is smaller, and different carriers (electrons and holes) are infused into luminescent layer
The ratio entered is more balanced, and with the raising of voltage, energy level potential barrier increases the impact effect that carrier injects, in high voltage
Under, big energy level potential barrier can significantly improve injection difficulty of the carrier to luminescent layer.
The carrier mobility of organic electroluminescent LED provided by the invention, phosphorescence luminescent layer is less than fluorescent light-emitting layer
Carrier mobility, at low voltage, what the carrier from first electrode and second electrode was injected into blue light-emitting
Ratio is more balanced, since the carrier mobility of fluorescent light-emitting layer is relatively high, makes in fluorescent light-emitting layer from second electrode
Carrier is more injected into phosphorescence luminescent layer, organic with the Carrier recombination from first electrode in phosphorescence luminescent layer
Electroluminescent diode issues blue phosphorescent.In addition, the energy between the first carrier functional layer and phosphorescence luminescent layer material of main part
Grade potential barrier is less than the energy level potential barrier between the second carrier functional layer and the fluorescent light-emitting layer material of main part, in high voltage,
Carrier from second electrode is obviously increased from the second carrier functional layer to the injection difficulty of luminescent layer, comes from first electrode
The transmission performance of carrier be higher than the carrier from second electrode, make carrier from second electrode and from the first electricity
The carrier of pole is compound in the fluorescent light-emitting layer close to second electrode, and organic electroluminescent LED issues blue-fluorescence.By
Triplet exciton is utilized in phosphorescence luminescent layer, luminous efficiency is higher than the fluorescent light-emitting layer to shine using singlet exciton,
Organic electroluminescent LED provided by the invention realizes low-voltage by adjusting the position of Carrier recombination at low voltage
Lower phosphorescence shines, hence it is evident that improves the blue light luminous efficiency of organic electroluminescent LED at low voltage.
2, organic electroluminescent LED provided by the invention, first electrode are anode, generate hole, and second electrode is yin
Pole generates electronics.At low voltage, the balanced proportion that electrons and holes are injected into luminescent layer, due to the load of fluorescent light-emitting layer
Transport factor height is flowed, the electronics in fluorescent light-emitting layer is more injected into phosphorescence luminescent layer, and electrons and holes shine in phosphorescence
Compound in layer, device issues blue phosphorescent.Under high voltages, due to energy level potential barrier Δ Ee1Larger, electronics is by the second carrier function
The difficulty that can be injected to luminescent layer increases, and limits the transmission performance of electronics, electrons and holes are in the fluorescence radiation close to cathode
Compound in layer, device issues blue-fluorescence, with the high-luminous-efficiency of device at low voltage.
3, organic electroluminescent LED provided by the invention, first electrode are cathode, generate electronics, and second electrode is sun
Pole generates hole.At low voltage, the balanced proportion that electrons and holes are injected into luminescent layer, due to the load of fluorescent light-emitting layer
Transport factor height is flowed, the hole in fluorescent light-emitting layer is more injected into phosphorescence luminescent layer, sends out electrons and holes in phosphorescence
Compound in photosphere, device issues blue phosphorescent.Under high voltages, due to energy level potential barrier Δ Eh2Larger, hole is by the second carrier
The difficulty that function is injected to luminescent layer increases, and limits the transmission performance in hole, and electrons and holes are sent out in the fluorescence close to anode
Compound in photosphere, device issues blue-fluorescence, with the high-luminous-efficiency of device at low voltage.
4, Organnic electroluminescent device provided by the invention, several pixel units including array distribution, each pixel
It include feux rouges sub-pixel unit, green light sub-pixel unit and blue light sub-pixel unit, the blue light sub-pixel unit in unit
For above-mentioned organic electroluminescent LED.
Since the wavelength of the absorption spectrum of blue light is shorter, band gap between the HOMO energy level and lumo energy of blue-light-emitting dyestuff
Width, blue light emitting need higher energy, cause at low voltage, the luminous efficiency of blue light sub-pixel unit is low, organic electroluminescence
The blue light and feux rouges of light emitting device, the luminous efficiency of green light are unbalanced, are easy to happen colour cast, and it is partially red low ash rank occur.
Organic electro luminescent device provided by the invention, by setting phosphorescence for the blue light-emitting of blue light sub-pixel unit
The double emitting layers of luminescent layer and fluorescent light-emitting layer, and adjust the current-carrying in energy level potential barrier and phosphorescence luminescent layer and fluorescent light-emitting layer
Transport factor makes under low-voltage, and the phosphorescence luminescent layer of blue light sub-pixel unit shines, under high voltage, blue light sub-pixel unit
Fluorescent light-emitting layer shines.The luminous efficiency of phosphorescence luminescent layer is high, thus under balanced low-voltage between three sub-pixel units
Luminous efficiency, the colour cast problem of solving device.In addition, the stable luminescent property of blue-fluorescence luminescent material, luminescent lifetime are long,
Under high voltage, blue luminescence layer shines and makes that the chromaticity coordinates of device is relative constant, color stability improves.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described 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, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the voltage-brightness curve graph of tri- sub-pixels of RGB in the existing full-color display device of pixel；
Fig. 2 is a kind of structural schematic diagram of organic electroluminescent LED provided in an embodiment of the present invention；
Fig. 3 is another structural schematic diagram of organic electroluminescent LED provided in an embodiment of the present invention；
Fig. 4 is another structural schematic diagram of organic electroluminescent LED provided in an embodiment of the present invention；
Fig. 5 is another structural schematic diagram of organic electroluminescent LED provided in an embodiment of the present invention；
Description of symbols:
11- first electrode, 12- third carrier functional layer, 13- the first carrier functional layer, 14- blue light-emitting, 15-
Second carrier functional layer, the 4th carrier functional layer of 16-, 141- phosphorescence luminescent layer, 142- fluorescent light-emitting layer.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described 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
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " first ", " second ", " third " are used for description purposes only,
It is not understood to indicate or imply relative importance.
The present invention can be embodied in many different forms, and should not be construed as limited to embodiment set forth herein.
On the contrary, providing these embodiments, so that the disclosure will be thorough and complete, and design of the invention will be fully conveyed to
Those skilled in the art, the present invention will only be defined by the appended claims.In the accompanying drawings, for clarity, the area Ceng He can be exaggerated
The size and relative size in domain.It should be understood that when element such as layer is referred to as " being formed in " or " setting exists " another element
When "upper", which be can be arranged directly on another element, or there may also be intermediary elements.On the contrary, working as element
When referred to as on " being formed directly into " or " being set up directly on " another element, intermediary element is not present.
According to first technical solution, the embodiment of the invention provides a kind of organic electroluminescent LEDs, such as Fig. 2 institute
Show, including the first electrode 11, the first carrier functional layer 13, two layers of blue light-emitting 14, the second current-carrying being cascading
Subfunction layer 15 and second electrode 17.Wherein, two layers of blue light-emitting 14 is respectively to be arranged close to the first carrier functional layer 13
Phosphorescence luminescent layer 141, and close to the second carrier functional layer 15 setting fluorescent light-emitting layer 142.In organic electroluminescent two
When pole pipe works, by applying certain driving voltage, the first carrier for generating first electrode 11 is by the first carrier
The transmission of functional layer 13 is injected into blue light-emitting 14；Second electrode 17 is come from what is transmitted through the second carrier functional layer 15
The second Carrier recombination.
It should be noted that since the wavelength of the absorption spectrum of blue light is shorter, the HOMO energy level of blue-light-emitting dyestuff and
Band gap is wide between lumo energy, and blue light emitting needs higher energy, causes at low voltage, the luminous effect of blue light emitting device
Rate is relatively low.
The mobility of the first carrier is less than in view of the above-mentioned problems, the first carrier functional layer 13 is arranged in the present embodiment
Second carrier functional layer 15 is to the mobility of the second carrier, and at low voltage, the first carrier and the second carrier are to indigo plant
Injection ratio in light luminescent layer 14 is more balanced, since the carrier mobility of fluorescent light-emitting layer 142 is higher than phosphorescence luminescent layer
141 carrier mobility, the second carrier in fluorescent light-emitting layer 142 are more injected into phosphorescence luminescent layer, then with
First carrier compound sending phosphorescence in phosphorescence luminescent layer 141.Meanwhile the first carrier functional layer of setting 13 shines with phosphorescence
Energy level potential barrier between 141 material of main part of layer is less than between 142 material of main part of the second carrier functional layer 15 and fluorescent light-emitting layer
Energy level potential barrier, under high voltages, energy level potential barrier between carrier functional layer and luminescent layer material of main part in luminescent layer to carrying
The injection efficiency of stream is affected, due to the energy between 142 material of main part of the second carrier functional layer 15 and fluorescent light-emitting layer
Grade potential barrier is high, hence it is evident that injection difficulty of second carrier into blue light-emitting 14 is increased, the first carrier functional layer 13
Transmission performance is opposite to be better than the second carrier functional layer 15, makes the first carrier and the second carrier close to second electrode 17
Compound sending fluorescence in fluorescent light-emitting layer 142.
Organic electroluminescent LED in the present embodiment is realized at low voltage, is shone by phosphorescence luminescent layer 141,
And under high voltages, it is shone by fluorescent light-emitting layer 142.Since phosphorescence luminescent layer 141 utilizes Triplet exciton, shine effect
Rate is higher than the fluorescent light-emitting layer 142 to shine using singlet exciton, and making blue light diode at low voltage has high luminous effect
Rate makes blue light diode under high voltages colour-stable simultaneously as the stable luminescent property of fluorescence radiation, luminescent lifetime are long
Property it is high, device lifetime is long.
That is, phosphorescence luminescent layer 141 is made to open bright voltage with relatively low than fluorescent light-emitting layer 142, at low voltage, make
Phosphorescence luminescent layer 141 is lit first, by the high advantage of phosphorescence luminous efficiency, solves blue-light device luminous effect at low voltage
The low defect of rate.
Specifically, first electrode 11 can be anode, and second electrode 17 can be cathode, is located at anode and phosphorescence shines
The first carrier functional layer 13 between layer 141 is the carrier functional layer of cavity type, specifically can be hole injection layer, sky
Cave transport layer or electronic barrier layer.The second carrier functional layer 15 between cathode and fluorescent light-emitting layer 142 is electronics
The carrier functional layer of type, specifically can be electron injecting layer, electron transfer layer or hole blocking layer.First carrier function
The hole mobility of ergosphere 13 less than the second carrier functional layer 15 electron mobility, at low voltage, fluorescent light-emitting layer 142
Middle electronics is more injected into phosphorescence luminescent layer 141, keeps electrons and holes compound in phosphorescence luminescent layer 141, realizes phosphorescence
It shines.Meanwhile first carrier functional layer 13 HOMO energy level and 141 material of main part of phosphorescence luminescent layer HOMO energy level energy level
Potential barrier Δ Eh1, less than the energy level of the LOMO energy level of the LOMO energy level and 142 material of main part of fluorescent light-emitting layer of the second current-carrying subfunction
Potential barrier Δ Ee1.Under high voltages, due to Δ Ee1It is larger, transmission of the electronics to blue light-emitting 14 is hindered, electrons and holes are made
The compound sending fluorescence in the fluorescent light-emitting layer 142 close to cathode.To realize to organic electroluminescent LED in difference
The adjusting of light emitting region under voltage, making blue light diode at low voltage has high luminous efficiency.
Alternatively, first electrode 11 can also be cathode, and second electrode 17 can also be anode, position
The second carrier functional layer 15 between anode and fluorescent light-emitting layer 142 is the carrier functional layer of cavity type, specifically may be used
To be hole injection layer, hole transmission layer or electronic barrier layer.The second current-carrying between cathode and phosphorescence luminescent layer 141
Subfunction layer 15 is the carrier functional layer of electron type, specifically can be electron injecting layer, electron transfer layer or hole resistance
Barrier.The electron mobility of phosphorescence luminescent layer 141 is less than the hole mobility of fluorescent light-emitting layer 142, at low voltage, fluorescence hair
Hole is more injected into phosphorescence luminescent layer 141 in photosphere 142, makes electrons and holes in the phosphorescence luminescent layer close to cathode
It is compound in 141, realize that phosphorescence shines.Meanwhile first carrier functional layer 13 HOMO energy level and 141 main body material of phosphorescence luminescent layer
The energy level potential barrier Δ E of the HOMO energy level of materiale2, less than the LOMO energy level and 142 main body material of fluorescent light-emitting layer of the second current-carrying subfunction
The energy level potential barrier Δ E of the LOMO energy level of materialh2.Under high voltages, due to Δ Eh2It is larger, hole is hindered to blue light-emitting 14
Transmission, make electrons and holes close to anode fluorescent light-emitting layer 142 in compound sending fluorescence.To realize to Organic Electricity
The adjusting of photoluminescence diode light emitting region under different voltages, making blue light diode at low voltage has high luminous effect
Rate.
As the first optionally embodiment, as shown in figure 3, can also be in the first carrier functional layer 13 and the first electricity
Third carrier functional layer 12 is set between pole 11.For example, first electrode 11 is anode, the first carrier functional layer 13 is electronics
Barrier layer, third carrier functional layer 12 can be set to hole injection layer, hole transmission layer or be hole injection layer and sky
The lamination of cave transport layer.Alternatively, the first carrier functional layer 13 is hole transmission layer, third carrier functional layer 12 is set as empty
Cave implanted layer.As long as the carrier mobility of phosphorescence luminescent layer 141 is made to be less than the carrier mobility of fluorescent light-emitting layer 142, protect
Card at low voltage, enables two kinds of carriers in the position recombination luminescence of phosphorescence luminescent layer 141.
As the deformation of the first optional embodiment, first electrode 11 is cathode, and the first carrier functional layer 13 is empty
Cave barrier layer, third carrier functional layer 12 can be set to electron injecting layer, electron transfer layer or be electron injecting layer and
The lamination of electron transfer layer.Alternatively, the first carrier functional layer 13 is electron transfer layer, third carrier functional layer 12 is set as
Electron injecting layer.
As second of optionally embodiment, as shown in figure 4, can also be in the second carrier functional layer 15 and the second electricity
4th carrier functional layer 16 is set between pole 17.For example, second electrode 17 is cathode, the second carrier functional layer 15 is hole
Barrier layer, the 4th carrier functional layer 16 can be set to electron injecting layer, electron transfer layer or be electron injecting layer and electricity
The lamination of sub- transport layer.Alternatively, the second carrier functional layer 15 is electron transfer layer, the 4th carrier functional layer 16 is set as electricity
Sub- implanted layer.As long as the carrier mobility of phosphorescence luminescent layer 141 is made to be less than the carrier mobility of fluorescent light-emitting layer 142, protect
Card at low voltage, enables two kinds of carriers in the position recombination luminescence of phosphorescence luminescent layer 141；First carrier functional layer 13
Energy level potential barrier between 141 material of main part of phosphorescence luminescent layer is less than the second carrier functional layer 15 and the fluorescence radiation
Energy level potential barrier between 142 material of main part of layer guarantees under high voltages, to enable two kinds of carriers in fluorescent light-emitting layer 142
Position recombination luminescence.
As the deformation of second of optional embodiment, second electrode 17 is anode, and the second carrier functional layer 15 is electricity
Sub- barrier layer, the 4th carrier functional layer 16 can be set to hole injection layer, hole transmission layer or be hole injection layer and
The lamination of hole transmission layer.Alternatively, the second carrier functional layer 15 is hole transmission layer, the 4th carrier functional layer 16 is set as
Hole injection layer.
As the third optionally embodiment, as shown in figure 5, can also be simultaneously in the second carrier functional layer 15 and the
4th carrier functional layer 16 is set between two electrodes 17, the is arranged between the first carrier functional layer 13 and first electrode 11
Three carrier functional layers 12.For example, first electrode 11 is anode, the first carrier functional layer 13 is electronic barrier layer, and third carries
Stream subfunction layer 12 can be set to hole injection layer, hole transmission layer or be the folded of hole injection layer and hole transmission layer
Layer.Second electrode 17 is cathode, and the second carrier functional layer 15 is hole blocking layer, and the 4th carrier functional layer 16 can be set
For electron injecting layer, electron transfer layer or be electron injecting layer and electron transfer layer lamination.Alternatively, the first carrier function
Ergosphere 13 is hole transmission layer, and third carrier functional layer 12 is set as hole injection layer.Second carrier functional layer 15 is electricity
Sub- transport layer, the 4th carrier functional layer 16 are set as electron injecting layer.As long as making the carrier mobility of phosphorescence luminescent layer 141
Less than the carrier mobility of fluorescent light-emitting layer 142, guarantee at low voltage, to enable two kinds of carriers in phosphorescence luminescent layer
141 position recombination luminescence；Energy level potential barrier between 141 material of main part of first carrier functional layer 13 and phosphorescence luminescent layer is less than
Energy level potential barrier between 142 material of main part of the second carrier functional layer 15 and the fluorescent light-emitting layer, guarantees in high voltage
Under, enable two kinds of carriers in the position recombination luminescence of fluorescent light-emitting layer 142.
As the deformation of the third optional embodiment, first electrode 11 is cathode, and the first carrier functional layer 13 is empty
Cave barrier layer, third carrier functional layer 12 can be set to electron injecting layer, electron transfer layer or be electron injecting layer and
The lamination of electron transfer layer.Second electrode 17 is anode, and the second carrier functional layer 15 is electronic barrier layer, the 4th carrier function
Ergosphere 16 can be set to hole injection layer, hole transmission layer or be hole injection layer and hole transmission layer lamination.Or
Person, the first carrier functional layer 13 are electron transfer layers, and third carrier functional layer 12 is set as electron injecting layer.Second current-carrying
Subfunction layer 15 is hole transmission layer, and the 4th carrier functional layer 16 is set as hole injection layer.
According to second embodiment, the embodiment of the present invention provides a kind of Organnic electroluminescent device, including array arrangement
Several pixel units, include feux rouges sub-pixel unit, green light sub-pixel unit and blue light sub-pixel list in each pixel unit
Member includes the first electrode 11 for stacking setting, luminescent layer, at least one layer of carrier in the sub-pixel unit of different luminescent colors
Functional layer and second electrode 17.Luminescent layer in each sub-pixel unit is red light luminescent layer, green light emitting layer and blue light hair respectively
Photosphere 14.
It should be noted that feux rouges, green light, the wavelength of blue light are gradually short, and energy is gradually high in Organnic electroluminescent device.
Therefore, the bright voltage that opens of feux rouges sub-pixel unit is lower than green light sub-pixel unit and blue light sub-pixel unit, independent in low-voltage
When lighting blue light sub-pixel unit, feux rouges sub-pixel unit is easy to be lighted simultaneously；And light simultaneously blue light sub-pixel unit and
When feux rouges sub-pixel unit, the luminous efficiency of blue light sub-pixel unit is significantly lower than feux rouges sub-pixel unit, generates low ash rank color
Inclined problem.
To solve the above problems, in Organnic electroluminescent device provided in an embodiment of the present invention, by blue light sub-pixel unit
Any organic electroluminescent LED provided in first embodiment of the invention is provided.
For example, blue light sub-pixel unit has first electrode 11 (anode), second electrode 17 (cathode) is located at anode and phosphorus
The first carrier functional layer 13 between light luminescent layer 141 is the carrier functional layer of cavity type, specifically hole injection layer,
Hole transmission layer or electronic barrier layer.The second carrier functional layer 15 between cathode and fluorescent light-emitting layer 142 is electricity
The carrier functional layer of subtype, specifically can be electron injecting layer, electron transfer layer or hole blocking layer.Phosphorescence luminescent layer
141 hole mobility is less than the electron mobility of fluorescent light-emitting layer 142, at low voltage, hole from anode and comes from
It is more balanced that the electronics of cathode injects ratio into blue light-emitting, since the electron mobility in fluorescent light-emitting layer 142 is fast, makes
Electronics is more injected into phosphorescence luminescent layer 141, and electrons and holes are compound in phosphorescence luminescent layer 141, realizes that phosphorescence shines.
Meanwhile first carrier functional layer 13 HOMO energy level and 141 material of main part of phosphorescence luminescent layer HOMO energy level energy level potential barrier
ΔEh1, less than the energy level potential barrier of the LOMO energy level of the LOMO energy level and 142 material of main part of fluorescent light-emitting layer of the second current-carrying subfunction
ΔEe1.Under high voltages, due to Δ Ee1It is larger, transmission of the electronics to blue light-emitting 14 is hindered, electrons and holes are being leaned on
Compound sending fluorescence in the fluorescent light-emitting layer 142 of nearly cathode.To realize to organic electroluminescent LED in different voltages
The adjusting of lower light emitting region, making blue light diode at low voltage has high luminous efficiency.
That is, the Organnic electroluminescent device in the present embodiment, by the way that fluorescence radiation is arranged in blue light sub-pixel unit
Layer 142 and phosphorescence luminescent layer 141, and make phosphorescence luminescent layer 141 that must open bright voltage and open bright voltage lower than fluorescent light-emitting layer 142,
At low voltage, the phosphorescence luminescent layer 141 in blue light sub-pixel unit is lit, due to luminous high-efficient, the equilibrium of phosphorescence
Luminous efficiency in Organnic electroluminescent device between different subpixel unit solves Organnic electroluminescent device in low ash rank
Under partially red problem, be improved the color stability of device.
As variant embodiment, blue light sub-pixel unit can also be its provided in first technical solution of the invention
His any organic electroluminescent LED.
Feux rouges sub-pixel unit and green light sub-pixel unit as optional embodiment, in Organnic electroluminescent device
It can also be the organic electroluminescent LED of published any structure in the prior art, as long as feux rouges sub-pixel list can be made
The luminous feux rouges of member, the luminous green light of green light sub-pixel unit, are not specifically limited herein.
Embodiment 1
The present embodiment provides a kind of specific examples of organic electroluminescent LED, including the first electricity being cascading
Pole 11, third carrier functional layer 12, the first carrier functional layer 13, two layers of blue light-emitting 14, the second carrier functional layer
15, the 4th carrier functional layer 16 and second electrode 17.
Wherein, first electrode 11 is anode, and third carrier functional layer 12 is the hole injection layer being stacked and hole
Transport layer, the first carrier functional layer 13 are electronic barrier layer, and two layers of blue light-emitting 14 is respectively close to first electrode 11
The fluorescent light-emitting layer 142 of phosphorescence luminescent layer 141 and close second electrode 17, the second carrier functional layer 15 are hole blocking layer,
4th carrier functional layer 16 is the lamination of electron transfer layer and electron injecting layer, and second electrode 17 is cathode.
In organic electroluminescent LED, Δ Eh1For 0eV, Δ Ee1For 0.17eV；Phosphorescence luminescent layer 141 selects phosphorescence material
Material, specially TCTA:FIrpic (5%, 20nm), hole mobility 5.2e-4cm2/V/s；Fluorescent light-emitting layer 142 is selected glimmering
Luminescent material, specially TmPyPb:DSA-Ph (5%, 20nm), electron mobility 1.1e-3cm2/V/s。
The device architecture of organic electroluminescent LED in the present embodiment are as follows: ITO (10nm)/Ag (100nm)/ITO
(10nm)/HATCN (5nm)/m-MTDATA (20nm)/TCTA (200nm)/TCTA:FIrpic (5%, 20nm)/TmPyPb:
DSA-Ph (5%, 20nm)/BPhen (5nm)/TmPyPb (40nm)/LiF (1nm)/Mg:Ag (20%, 15nm)/NPB (60nm).
Embodiment 2
A kind of organic electroluminescent LED is present embodiments provided, with the organic electroluminescent recorded in embodiment 1
Diode is essentially identical, only difference is that:
In organic electroluminescent LED, Δ Eh1For 0eV, Δ Ee1For 0.2eV；Phosphorescence luminescent layer 141 selects phosphorescence material
Material, specially TCTA:FIrpic (5%, 20nm), hole mobility 5.2e-4cm2/V/s；Fluorescent light-emitting layer 142 is selected glimmering
Luminescent material, specially TPBi:DSA-Ph (5%, 20nm), electron mobility 8.2e-4cm2/V/s。
The device architecture of organic electroluminescent LED in the present embodiment are as follows: ITO (10nm)/Ag (100nm)/ITO
(10nm)/HATCN (5nm)/m-MTDATA (20nm)/TCTA (200nm)/TCTA:FIrpic (5%, 20nm)/TPBi:DSA-
Ph (5%, 20nm)/BPhen (5nm)/TmPyPb (40nm)/LiF (1nm)/Mg:Ag (20%, 15nm)/NPB (60nm).
Embodiment 3
A kind of organic electroluminescent LED is present embodiments provided, with the organic electroluminescent recorded in embodiment 1
Diode is essentially identical, only difference is that:
It is not provided with third carrier functional layer 12, the 4th carrier functional layer 16 is electron injecting layer.
The device architecture of organic electroluminescent LED in the present embodiment are as follows: ITO (10nm)/Ag (100nm)/ITO
(10nm)/TCTA (300nm)/TCTA:FIrpic (5%, 20nm)/TmPyPb:DSA-Ph (5%, 20nm)/BPhen (5nm)/
TmPyPb (40nm)/Mg:Ag (20%, 15nm)/NPB (60nm).
Embodiment 4
The present embodiment provides a kind of specific examples of organic electroluminescent LED, including the first electricity being cascading
Pole 11, third carrier functional layer 12, the first carrier functional layer 13, two layers of blue light-emitting 14, the second carrier functional layer
15, the 4th carrier functional layer 16 and second electrode 17.
Wherein, first electrode 11 is cathode, and third carrier functional layer 12 is the electron injecting layer and electronics being stacked
Transport layer, the first carrier functional layer 13 are hole blocking layer, and two layers of blue light-emitting 14 is respectively close to first electrode 11
The fluorescent light-emitting layer 142 of phosphorescence luminescent layer 141 and close second electrode 17, the second carrier functional layer 15 are electronic barrier layer,
4th carrier functional layer 16 is the lamination of hole transmission layer and hole injection layer, and second electrode 17 is anode.
In organic electroluminescent LED, Δ Eh2For 0eV, Δ Ee2For 0.20eV；Phosphorescence luminescent layer 141 selects phosphorescence material
Material, specially TPBi:FIrpic (5%, 20nm), hole mobility 5e-8cm2/V/s；Fluorescent light-emitting layer 142 selects fluorescence
Material, specially TCTA:DSA-Ph (5%, 20nm), electron mobility 5e-7cm2/V/s。
The device architecture of organic electroluminescent LED in the present embodiment are as follows: ITO (10nm)/Ag (100nm)/ITO
(10nm)/HATCN (5nm)/m-MTDATA (20nm)/TCTA (200nm)/TCTA:DSA-Ph (5%, 20nm)/TPBi:
FIrpic (5%, 20nm)/BPhen (5nm)/TmPyPb (40nm)/LiF (1nm)/Mg:Ag (20%, 15nm)/NPB (60nm).
Embodiment 5
A kind of organic electroluminescent LED is present embodiments provided, with the organic electroluminescent recorded in embodiment 4
Diode is essentially identical, only difference is that:
In organic electroluminescent LED, Δ Eh2For 0eV, Δ Ee2For 0.17eV；Phosphorescence luminescent layer 141 selects phosphorescence material
Material, specially TmPyPb:FIrpic (5%, 20nm), hole mobility 3e-8cm2/V/s；Fluorescent light-emitting layer 142 is selected glimmering
Luminescent material, specially TCTA:DSA-Ph (5%, 20nm), electron mobility 5e-7cm2/V/s。
The device architecture of organic electroluminescent LED in the present embodiment are as follows: ITO (10nm)/Ag (100nm)/ITO
(10nm)/HATCN (5nm)/m-MTDATA (20nm)/TCTA (200nm)/TCTA:DSA-Ph (5%, 20nm)/TmPyPb:
FIrpic (5%, 20nm)/BPhen (5nm)/TmPyPb (40nm)/LiF (1nm)/Mg:Ag (20%, 15nm)/NPB (60nm).
Embodiment 6
A kind of organic electroluminescent LED is present embodiments provided, with the organic electroluminescent recorded in embodiment 4
Diode is essentially identical, only difference is that:
Third carrier functional layer 12 is electron transfer layer, and the 4th carrier functional layer 16 is hole injection layer.
The device architecture of organic electroluminescent LED in the present embodiment are as follows: ITO (10nm)/Ag (100nm)/ITO
(10nm)/HATCN (5nm)/TCTA (200nm)/TCTA:DSA-Ph (5%, 20nm)/TPBi:FIrpic (5%, 20nm)/
BPhen (5nm)/TmPyPb (40nm)/Mg:Ag (20%, 15nm)/NPB (60nm).
Embodiment 7
A kind of Organnic electroluminescent device is present embodiments provided, several pixel units including array distribution are each described
It include feux rouges sub-pixel unit, green light sub-pixel unit and blue light sub-pixel unit in pixel unit.Wherein, blue light sub-pixel
Unit is the organic electroluminescent LED in embodiment 1.
The device architecture of feux rouges sub-pixel unit are as follows: ITO (10nm)/Ag (100nm)/ITO (10nm)/HATCN (5nm)/
α-NPD(20nm)/TCTA(200nm)/CzPPQCz:Ir(piq)3(3%, 30nm)/TmPyPb (40nm)/LiF (1nm)/Mg:
Ag (20%, 15nm)/NPB (60nm).
The device architecture of green light sub-pixel unit are as follows: ITO (10nm)/Ag (100nm)/ITO (10nm)/HATCN (5nm)/
m-MTDATA(20nm)/α-NPD(200nm)/TCTA:Ir(ppy)3(8%, 30nm)/BAlq (40nm)/LiF (1nm)/Mg:Ag
(20%, 15nm)/NPB (60nm).
Embodiment 8
A kind of Organnic electroluminescent device is present embodiments provided, several pixel units including array distribution are each described
It include feux rouges sub-pixel unit, green light sub-pixel unit and blue light sub-pixel unit in pixel unit.Wherein, blue light sub-pixel
Unit is the organic electroluminescent LED in embodiment 2.
The device architecture of feux rouges sub-pixel unit and green light sub-pixel unit is the same as embodiment 7.
Embodiment 9
A kind of Organnic electroluminescent device is present embodiments provided, several pixel units including array distribution are each described
It include feux rouges sub-pixel unit, green light sub-pixel unit and blue light sub-pixel unit in pixel unit.Wherein, blue light sub-pixel
Unit is the organic electroluminescent LED in embodiment 3.
The device architecture of feux rouges sub-pixel unit and green light sub-pixel unit is the same as embodiment 7.
Embodiment 10
A kind of Organnic electroluminescent device is present embodiments provided, several pixel units including array distribution are each described
It include feux rouges sub-pixel unit, green light sub-pixel unit and blue light sub-pixel unit in pixel unit.Wherein, blue light sub-pixel
Unit is the organic electroluminescent LED in embodiment 4.
The device architecture of feux rouges sub-pixel unit and green light sub-pixel unit is the same as embodiment 7.
Embodiment 11
A kind of Organnic electroluminescent device is present embodiments provided, several pixel units including array distribution are each described
It include feux rouges sub-pixel unit, green light sub-pixel unit and blue light sub-pixel unit in pixel unit.Wherein, blue light sub-pixel
Unit is the organic electroluminescent LED in embodiment 5.
The device architecture of feux rouges sub-pixel unit and green light sub-pixel unit is the same as embodiment 7.
Embodiment 12
A kind of Organnic electroluminescent device is present embodiments provided, several pixel units including array distribution are each described
It include feux rouges sub-pixel unit, green light sub-pixel unit and blue light sub-pixel unit in pixel unit.Wherein, blue light sub-pixel
Unit is the organic electroluminescent LED in embodiment 6.
The device architecture of feux rouges sub-pixel unit and green light sub-pixel unit is the same as embodiment 7.
Comparative example 1
This comparative example provides a kind of organic electroluminescent LED, with the organic electroluminescent recorded in embodiment 1
Diode is essentially identical, only difference is that:
Blue light-emitting 14 is only one layer of phosphorescence luminescent layer 141.
Comparative example 2
This comparative example provides a kind of organic electroluminescent LED, with the organic electroluminescent recorded in embodiment 1
Diode is essentially identical, only difference is that:
In organic electroluminescent LED, Δ Eh1For 0.1eV, Δ Ee1For 0eV；Phosphorescence luminescent layer 141 selects phosphorescence material
Material, specially TAPC:FIrpic (5%, 20nm), hole mobility 6.1e-3cm2/V/s；Fluorescent light-emitting layer 142 is selected glimmering
Luminescent material, specially TPBi:DSA-Ph (5%, 20nm), electron mobility 8.2e-4cm2/V/s。
The device architecture of organic electroluminescent LED in the present embodiment are as follows: ITO (10nm)/Ag (100nm)/ITO
(10nm)/HATCN (5nm)/m-MTDATA (20nm)/TPD (200nm)/TAPC:FIrpic (5%, 20nm)/TPBi:DSA-Ph
(5%, 20nm)/TPBi (5nm)/TmPyPb (40nm)/LiF (1nm)/Mg:Ag (20%, 15nm)/NPB (60nm).
Comparative example 3
This comparative example provides a kind of organic electroluminescent LED, with the organic electroluminescent recorded in embodiment 5
Diode is essentially identical, only difference is that:
Blue light-emitting 14 is only one layer of phosphorescence luminescent layer 141.
Comparative example 4
This comparative example provides a kind of organic electroluminescent LED, with the organic electroluminescent recorded in embodiment 5
Diode is essentially identical, only difference is that:
In organic electroluminescent LED, Δ Eh2For 0.30eV, Δ Ee2For 0.28eV；Phosphorescence luminescent layer 141 selects phosphorescence
Material, specially TCTA:FIrpic (5%, 20nm), hole mobility 5.2e-4cm2/V/s；Fluorescent light-emitting layer 142 is selected
Fluorescent material, specially TCTA:DSA-Ph (5%, 20nm), electron mobility 5e-7cm2/V/s。
The device architecture of organic electroluminescent LED in the present embodiment are as follows: ITO (10nm)/Ag (100nm)/ITO
(10nm)/HATCN (5nm)/m-MTDATA (20nm)/TPD (200nm)/TCTA:DSA-Ph (5%, 20nm)/TCTA:FIrpic
(5%, 20nm)/BAlq (5nm)/TmPyPb (40nm)/LiF (1nm)/Mg:Ag (20%, 15nm)/NPB (60nm).
Comparative example 5
A kind of Organnic electroluminescent device is present embodiments provided, several pixel units including array distribution are each described
It include feux rouges sub-pixel unit, green light sub-pixel unit and blue light sub-pixel unit in pixel unit.Wherein, blue light sub-pixel
Unit is the organic electroluminescent LED in comparative example 1.
The device architecture of feux rouges sub-pixel unit and green light sub-pixel unit is the same as embodiment 7.
Comparative example 6
A kind of Organnic electroluminescent device is present embodiments provided, several pixel units including array distribution are each described
It include feux rouges sub-pixel unit, green light sub-pixel unit and blue light sub-pixel unit in pixel unit.Wherein, blue light sub-pixel
Unit is the organic electroluminescent LED in comparative example 2.
The device architecture of feux rouges sub-pixel unit and green light sub-pixel unit is the same as embodiment 7.
Comparative example 7
A kind of Organnic electroluminescent device is present embodiments provided, several pixel units including array distribution are each described
It include feux rouges sub-pixel unit, green light sub-pixel unit and blue light sub-pixel unit in pixel unit.Wherein, blue light sub-pixel
Unit is the organic electroluminescent LED in comparative example 3.
The device architecture of feux rouges sub-pixel unit and green light sub-pixel unit is the same as embodiment 7.
Comparative example 8
A kind of Organnic electroluminescent device is present embodiments provided, several pixel units including array distribution are each described
It include feux rouges sub-pixel unit, green light sub-pixel unit and blue light sub-pixel unit in pixel unit.Wherein, blue light sub-pixel
Unit is the organic electroluminescent LED in comparative example 4.
The device architecture of feux rouges sub-pixel unit and green light sub-pixel unit is the same as embodiment 7.
Detect example
Above-described embodiment 7-12 and comparative example 5-8 are tested, and test result is compared, as shown in the table:
By upper table data it is found that organic electroluminescent LED provided by the invention, by setting phosphorescence luminescent layer and glimmering
Double blue light-emittings of light luminescent layer, and adjust the energy level of phosphorescence luminescent layer and fluorescent light-emitting layer and adjacent carrier functional layer
Carrier mobility in potential barrier and two kinds of luminescent layers sends out the recombination site of carrier in diode with the variation of voltage
Raw migration realizes that phosphorescence shines under low-voltage, and phosphorescence shines under high voltage, effectively increases the luminous efficiency of blue-light device.?
Using the Organnic electroluminescent device that above-mentioned blue-light device is formed, due to improving blue light sub-pixel unit under low-light level
Luminous efficiency effectively improves the low ash rank colour cast of device.
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 (10)
1. a kind of organic electroluminescent LED, which is characterized in that including be cascading first electrode, the first carrier
Functional layer, at least two layers of blue light-emitting, the second carrier functional layer and second electrode；The blue light-emitting includes close to institute
State the phosphorescence luminescent layer of the first carrier functional layer setting, and the fluorescence radiation close to the second carrier functional layer setting
Layer；
Energy level potential barrier between the first carrier functional layer and the phosphorescence luminescent layer material of main part is less than described second and carries
Flow the energy level potential barrier between subfunction layer and the fluorescent light-emitting layer material of main part, the carrier mobility of the phosphorescence luminescent layer
Less than the carrier mobility of the fluorescent light-emitting layer.
2. organic electroluminescent LED according to claim 1, which is characterized in that the first electrode is anode, institute
Stating second electrode is cathode；The HOMO of the HOMO energy level of the first carrier functional layer and the phosphorescence luminescent layer material of main part
The energy level potential barrier Δ E of energy levelh1, less than LOMO energy level and the fluorescent light-emitting layer material of main part of the second current-carrying subfunction
The energy level potential barrier Δ E of LOMO energy levele1。
3. organic electroluminescent LED according to claim 2, which is characterized in that the first carrier functional layer is
One of hole injection layer, hole transmission layer and electronic barrier layer, the second carrier functional layer are electron injecting layer, electricity
One of sub- transport layer and hole blocking layer.
4. organic electroluminescent LED according to claim 2 or 3, which is characterized in that the first current-carrying subfunction
Layer is electronic barrier layer, and the second carrier functional layer is hole blocking layer.
5. organic electroluminescent LED according to claim 1, which is characterized in that the first electrode is cathode, institute
Stating second electrode is anode；The LUMO of the lumo energy of the first carrier functional layer and the phosphorescence luminescent layer material of main part
The energy level potential barrier Δ E of energy levele2, less than HOMO energy level and the fluorescent light-emitting layer material of main part of the second current-carrying subfunction
The energy level potential barrier Δ E of HOMO energy levelh2。
6. organic electroluminescent LED according to claim 5, which is characterized in that the first carrier functional layer is
One of electron injecting layer, electron transfer layer and hole blocking layer, the second carrier functional layer are hole injection layer, sky
One of cave transport layer and electronic barrier layer.
7. organic electroluminescent LED according to claim 5 or 6, which is characterized in that the first current-carrying subfunction
Layer is hole blocking layer, and the second carrier functional layer is electronic barrier layer.
8. organic electroluminescent LED according to claim 1-7, which is characterized in that first carrier
Third carrier functional layer is additionally provided between functional layer and the first electrode；And/or the second carrier functional layer and
The 4th carrier functional layer is additionally provided between the second electrode.
9. organic electroluminescent LED according to claim 1-8, which is characterized in that the phosphorescence luminescent layer
The bright voltage that opens open bright voltage lower than the fluorescent light-emitting layer.
10. a kind of Organnic electroluminescent device, which is characterized in that several pixel units including array distribution, the pixel list
It include feux rouges sub-pixel unit, green light sub-pixel unit and blue light sub-pixel unit in member, the blue light sub-pixel unit is power
Benefit requires the described in any item organic electroluminescent LEDs of 1-9.
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