CN1921171A - White light organic electroluminescent device - Google Patents
White light organic electroluminescent device Download PDFInfo
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- CN1921171A CN1921171A CN 200610021843 CN200610021843A CN1921171A CN 1921171 A CN1921171 A CN 1921171A CN 200610021843 CN200610021843 CN 200610021843 CN 200610021843 A CN200610021843 A CN 200610021843A CN 1921171 A CN1921171 A CN 1921171A
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Abstract
The invention relates to a white light organic electroluminescent device. Wherein, it comprises transparent liner 1, anode layer 2, organic function layer 3, and cathode layer 4; the organic function layer 3 at least comprises lighting layer 34 formed by carrier material, blue fluorescent material and phosphorescent material; driven by external power 90, the device can light white color; the lighting layer 34 has single layer, dual-layer or multilayer structure; the organic function layer 3 also can comprises one or several of cavity pour layer 31, cavity transmission layer 32, electron baffle layer 33, cavity baffle layer 35, electro transmission layer 36, and electro pour layer 37. The invention combines the blue fluorescent material and phosphorescent material to improve the lighting efficiency, with adjustable color coordinate and improved stability. The invention can be used in the back light of color liquid crystal display.
Description
Technical field
The invention belongs to technical field of electronic components, relate to the organic elctroluminescent device that emits white light.
Background technology
Along with the arriving of Development of Multimedia Technology and information-intensive society, people are more and more higher to the flat-panel monitor performance demands.In recent years three kinds of new displays of Chu Xianing: plasma display, Field Emission Display and display of organic electroluminescence have all remedied the deficiency of CRT monitor and LCD to a certain extent.Wherein, display of organic electroluminescence has from main light emission, low-voltage DC driven, complete curings, wide visual angle, color and a series of advantage such as enriches, compare with LCD, display of organic electroluminescence does not need backlight, and the visual angle is big, and power is low, its response speed can reach 1000 times of LCD, its manufacturing cost but is lower than the LCD of equal resolution, and therefore, display of organic electroluminescence has broad application prospects.
Display of organic electroluminescence (Organic Light-emitting Diodes, OLEDs) research starts from the sixties in 20th century, people such as Pope (Pope M, Kallmann HP, and Magnante P.J.CHEM.PHYS., 1963,38,2042) reported first the electro optical phenomenon of anthracene single crystal, opened the electroluminescent research prelude of organic solid.1987, (C.W.Tang such as the researcher C.W.Tang of Kodak, S.A.Vanslyke, Appl.Phys.Lett., 1987,51,913) on the basis of summing up previous work, propose double-deck design philosophy, selected to have the derivative of tri-arylamine group and the 8 hydroxyl beautiful jade aluminum complex (Alq of better filming performance
3) respectively as hole transmission layer and luminescent layer, obtained high-quantum efficiency (1%), high-luminous-efficiency (1.5lm/W), high brightness (＞1000cd/m
2) and low driving voltage (＜10V) organic electroluminescence device; Nineteen ninety, (Burroughes JH such as the breadboard R.H.Friend of the Cavendish of Cambridge University, Bradley DDC, Brown AR, R.H.Friend.Nature (London), 1990,347,539) be that the luminescent layer material has been made polymer electroluminescent device with poly-phenylene vinylene (ppv) (PPV), opened up another frontier of luminescent device--thin polymer film electroluminescent device.These two breakthroughs make people see the potential hope of organic electroluminescence device as flat-panel monitor of new generation.
The flat-panel monitor of full color, large tracts of land, high information quantity is one of most important target of OLED development.Along with reaching its maturity of the luminous demonstration of monochrome, the research of full-color display spare also is surging forward.Full-colour image shows needs to obtain continuously adjustable color in visible wavelength range, and organic electroluminescent realizes that the colored method that shows has following several at present:
1, prepare the trichromatic luminescence center of red, green, blue (being RGB) respectively, the luminous intensity of regulating three kinds of colors then is to realize different color combination.
2, the device that preparation emits white light obtains three primary colors by the colour filter film then, realizes colored the demonstration thereby reconfigure three primary colors.
3, the device of preparation blue light-emitting obtains ruddiness and green glow respectively by blue-light excited other luminescent material then, thereby further obtains colored the demonstration.
4, with red, green, blue luminescent device vertical stack, thereby realize colored the demonstration.
In said method, the technology in method 4 preparation process is very complicated.Although the full color display device existing procucts based on method 1 come out, accurate pixel preparation needs high-quality vaporization coating template, brings the difficulty of accurate contraposition thus, makes that resolution is difficult to improve. Method 2,3 does not need accurate pixel contraposition, compares with method 3, and method 2 biggest advantage are colored filters of the liquid crystal display (LCD) of directly application technology maturation.Therefore, people turn to sight white light to add the scheme of colour filter film one after another recently, and the high efficiency white light parts becomes a research focus in OLED field.
Organic EL method of sending white light is disclosed in United States Patent (USP) 5503910, the fluorescence radiation layer that this invention will be sent blue light is used as the luminescence medium layer with the fluorescence radiation layer that sends green glow, and the fluorescent chemicals that will send ruddiness adds in the luminescence medium layer, red-green-blue is formed white light, but the efficient of device is relatively low.Send the Chinese patent 200310123726.6 of the organic electroluminescence device of white light, it utilizes two kinds of fluorescent materials to send the light of two kinds of wavelength, utilize then the inorganic phosphor bulk absorption wherein a kind of wavelength light and send the light of the third wavelength, the light of three kinds of wavelength is combined into white light, and is this restricted and efficient is not high in conjunction with organic and device preparation method inorganic light-emitting.A kind of candidate scheme that produces white light is seen United States Patent (USP) 5294870, it discloses a kind of organic EL multicolor display, the organic EL light source that comprises blue light-emitting has simultaneously and coats not transmitting green light and fluorescent material red-emitting in homogeneous pixel (subpixel) district.Utilize and transmitting green light send different colors from different inferior pixel regions with this device of color change (color shifting) of fluorescent material red-emitting.Yet the manufacturing of this microdevice is complicated and needs specialized operations technical ability, and efficient is on the low side.Jou (APL 87,043408 (2005) for Jwo-Huei Jou, et al) has reported a kind of with three kinds of phosphor materials of RGB (Firpic, Ir (ppy)
3, Btp
2Ir (acac)) be doped to the method for PVK polymer body material preparation white light parts, but device Smalt material lifetime is shorter.Therefore although challenging method has realized the improvement of white light OLED s, the efficient of these devices is still lower, still needs to improve the structure of device, to obtain high efficiency, the chromaticity coordinates organic electroluminescent white light device near ideal white light.
Summary of the invention
The purpose of this invention is to provide a kind of organic electroluminescence device that sends white light, its advantage high in conjunction with phosphor material efficient and the wide good stability of fluorescent material range of choice can reach 10lm/W or higher efficient.
For achieving the above object, the invention provides a kind of white light organic electroluminescent device, as shown in Figure 1, this device architecture comprises transparent substrates 1, anode layer 2, organic function layer 3 and cathode layer 4, wherein anode layer 2 is positioned at transparent substrates 1 surface, and organic function layer 3 is between anode layer 2 and cathode layer 4.Organic function layer 3 comprises luminescent layer 34 at least, the composite layer that described luminescent layer 34 is made up of carrier material, the fluorescent material that sends blue light and phosphorescent light-emitting materials.Under the driving of additional power source 90, device sends white light.
Described luminescent layer 34 can be by carrier material, sends the fluorescent material of blue light, the individual layer composite layer that phosphorescent light-emitting materials is formed; Under the driving of additional power source 90, device sends white light.Device architecture as shown in Figure 1.
Described luminescent layer 34 also can be by carrier material, sends the fluorescent material of blue light, the double-layer composite material layer that phosphorescent light-emitting materials is formed; Described double-layer composite material layer comprises by carrier material, send blue light fluorescence radiation layer 341 that the fluorescent material of blue light forms and the phosphorescence luminescent layer of being made up of carrier material, phosphorescent light-emitting materials 342; Under the driving of additional power source 90, blue light fluorescence radiation layer 341 sends the blue light of certain wave-length coverage, and phosphorescence luminescent layer 342 sends the light with 341 blue light-emitting complementation of blue light fluorescence radiation layer.Device architecture as shown in Figure 2, the position of the fluorescence radiation of blue light shown in figure layer 341 and phosphorescence luminescent layer 342 relation can be exchanged.
Described luminescent layer 34 can also be by carrier material, sends the fluorescent material of blue light, the multilayer materials layer that phosphorescent light-emitting materials is formed; Described multilayer materials layer comprises by carrier material, send blue light fluorescence radiation layer 341 that the fluorescent material of blue light forms and ruddiness phosphorescence luminescent layer of being made up of carrier material, ruddiness phosphorescent light-emitting materials 343 and the green glow phosphorescence luminescent layer of being made up of carrier material, green glow phosphorescent light-emitting materials 344; Under the driving of additional power source 90, blue light fluorescence radiation layer 341, ruddiness phosphorescence luminescent layer 343 and green glow phosphorescence luminescent layer 344 send blue light, ruddiness and the green glow in the three primary colors respectively.Device architecture as shown in Figure 3, the position of the fluorescence radiation of blue light shown in figure layer 341, ruddiness phosphorescence luminescent layer 343 and green glow phosphorescence luminescent layer 344 relation can be exchanged arbitrarily.
Described organic function layer 3 can also comprise in hole injection layer 31, hole transmission layer 32, electronic barrier layer 33, hole blocking layer 35, electron transfer layer 36 and the electron injecting layer 37 one or more layers, as shown in Figure 4 except that comprising luminescent layer 34 at least.
Among the present invention electron transfer layer 36 and hole transmission layer 32 act as the potential barrier that reduces between electrode and luminescent layer, prevent near exciton cancellation electrode, its is general to require to have higher charge mobility.Electron transfer layer 36 and hole transmission layer 32 materials can adopt metal organic complex, aromatic condensed ring class, adjacent phenanthrene to cough up beautiful jade Lei Huo oxadiazole compounds.
Among the present invention electronics stop 33 and the effect of hole blocking layer 35 be that restriction electronics or hole are in certain zone, to improve the meet probability of charge carrier at luminescent layer.Its material is adjacent the layer material energy level difference apart from bigger, so be called the electric charge barrier material.Wherein, the material that is applicable to hole blocking layer 35 is poly N-vinyl carbazole, BCP (bathocurpoine), two (2-methyl-8-quinoline acid group closes) tri-phenyl-silane alcohol (silanolate) aluminium (III), two (2-methyl-8-quinoline acid group closes) 4-phenol aluminium (III), two (2-methyl-8-quinoline acid group closes) 4-phenylphenol aluminium (III) etc.
The material of luminescent layer 34 is selected satisfy following condition: high-quantum efficiency characteristic, emission spectrum mainly is distributed in 400～700nm visible region; Good characteristic of semiconductor promptly has high conductance, and energy conduction electron or hole or both have concurrently; Good film forming does not produce pin hole in the thin layer of tens nanometers; Good thermal stability.The fluorescent material that sends blue light among the present invention is meant the fluorescent material of light wavelength in 380～470nm scope that be stimulated out, and it is the necessary part that constitutes white light parts in the present invention.At present, the fluorescent material that sends blue light comprises small molecule material or polymeric material, and kind is more, and the new material of excellent performance constantly is in the news out, and preferred material is NPD, DPVBi, Balq, BCzVB, Perylene, BczVBi etc.Phosphorescent light-emitting materials can be small molecule material efficiently, also can be polymeric material, mainly concentrates on the complex of heavy metals such as Ir, Pt, Os, Eu, Re, Au.Preferred phosphorescent light-emitting materials is green, redness, yellow, orange colour, orange red material based on heavy metal Ir and Pt.
Minimum energy excitation state in the organic solid is divided into singlet and triplet state, and the latter causes phosphorescent emissions.According to the spin statistical estimation, under electric shooting condition, the probability that hole and electronics are combined into singlet and triplet excitons is respectively 25% and 75%.For fluorescent material, it can only form singlet exciton by the mode that singlet-singlet energy shifts, thereby is 25% by the highest internal quantum efficiency of the device of singlet luminescent material preparation.In the practical application, because the influence of factors such as device interfaces refraction utilizes the external quantum efficiency of the organic electroluminescence device of fluorescent material preparation to be up to 5%.And for some phosphor material, it can utilize the triplet excitons of formation by the mode that triplet state-triplet energy state shifts, can utilize the singlet exciton of formation again by the mode that singlet-singlet energy shifts then through the intersystem crossing of singlet-triplet state, thereby the highest internal quantum efficiency of the device of being made up of phosphor material can reach 100%, external quantum efficiency can be four times of (Baldo MA of fluorescent material device in theory, O ' Brien DF, You Y, et al.NATURE, 1998,395,151).
Studies show that, in the micromolecule device, use organic phosphorescent complexes of heavy metals such as Pt or Ir can obtain 100% internal quantum efficiency nearly.At present, the green electroluminescent device power efficiency luminous based on triplet state reached 80lm/W, and corresponding external quantum efficiency surpasses 20%, and internal quantum efficiency is near 100% (Fukase A, Dao KLT, Kido J.Poly.Adv.Tech., 2002,13,601).But the reason that restriction is done white light parts with the RGB phosphor material is to lack blue phosphorescent material efficient and that have good stability.In fact in the functional white light constituent, blue ratio only accounts for a less part, for example: produce brightness 200cd/m
2D
65White light, need the brightness of red-green-blue to be respectively 39.4cd/m in theory
2, 148.8cd/m
2, 11.8cd/m
2(Wang J, Yu G.Proc.of SPIE Vol.5632,2005).So preparing efficient white light organic electroluminescent device in conjunction with phosphor material and existing well behaved blue fluorescent material efficiently is a kind of practicable method.
The present invention realizes that with fluorescent material and phosphor material white light parts has two kinds of methods.A kind of is to take two kinds of complementary colours to produce white light, be specially: blue light is sent by the fluorescent material of paying blue light, wavelength peak is in 380～470nm scope, complementary yellow or orange colour or orange redly send by phosphorescent light-emitting materials, and wavelength peak is within 550～650nm scope.Another kind method is to realize white light parts with three primary colors, being specially blue light is sent by the fluorescent material that sends blue light, wavelength peak is within 380～470nm scope, green light and red light are sent by two kinds of phosphorescent light-emitting materials respectively, the green light wavelength peak is in 470～550nm scope, and the red light wavelength peak is in 550～700nm scope.
Some white light OLED device architectures that adopt the present invention to make are exemplified below, certainly the white light parts structure in this patent be not only only limit to following several:
1. glass/ITO/ hole injection layer/blue light-emitting layer/Yellow luminous layer/electron transfer layer/cathode layer
2. glass/ITO/ hole injection layer/hole transmission layer/blue light-emitting layer/Yellow luminous layer/electron transfer layer/cathode layer
3. glass/ITO/ hole injection layer/hole transmission layer/blue light-emitting layer/Yellow luminous layer/hole blocking layer/electron transfer layer/cathode layer
4. glass/ITO/ hole injection layer/hole transmission layer/blue light-emitting layer/red light emitting layer/green light emitting layer/electron transfer layer/cathode layer
5. glass/ITO/ hole transmission layer/blue light-emitting layer/red light emitting layer/green light emitting layer/electron transfer layer/cathode layer
6. luminescent layer/electron transfer layer/the cathode layer of glass/conducting polymer/polymer-doped RGB dyestuff
7. silica-based TFT/ anode layer/hole injection layer/blue light-emitting layer/Yellow luminous layer/electron transfer layer/cathode layer
8. silica-based TFT/ anode layer/hole transmission layer/blue light-emitting layer/Yellow luminous layer/hole blocking layer/electron transfer layer/cathode layer
The organic electroluminescence device that sends white light that the present invention proposes, it has the following advantages: make full use of the high characteristics of phosphorescent light-emitting materials luminous efficiency, thereby improve the luminous efficiency of device; Selection is sent the fluorescent material of blue light as the blue composition in the white light, increases the range of choice of blue light material, has improved the stability of device simultaneously; Trim such as thickness by regulating each luminescent layer or doping content etc. are very easily sent the purity of white light; Be suitable for making the high-quality composite colour organic electroluminescent display device that variegates the filter coating mode by white light, and the backlight that is applied to Color Liquid Crystal Display, fields such as illumination lamp plate.
Description of drawings
Fig. 1 is the basic structure schematic diagram of a kind of white light organic electroluminescent device of proposing of the present invention, and wherein 1 is transparent substrates, the 2nd, and anode layer, the 3rd, organic function layer, the 4th, cathode layer, the 90th, driving power, the 34th, luminescent layer (identical) with organic function layer 3.
Fig. 2 is a kind of structural representation with white light organic electroluminescent device of double-deck luminescent layer that the present invention proposes, and wherein 1 is transparent substrates, the 2nd, and anode layer, the 3rd, organic function layer, the 4th, cathode layer, the 90th, driving power, the 34th, luminescent layer (identical) with organic function layer 3.Luminescent layer 34 comprises blue light fluorescence radiation layer 341 and phosphorescence luminescent layer 342.
Fig. 3 is a kind of structural representation with white light organic electroluminescent device of multilayer luminescent layer that the present invention proposes, and wherein 1 is transparent substrates, the 2nd, and anode layer, the 3rd, organic function layer, the 4th, cathode layer, the 90th, driving power, the 34th, luminescent layer (identical) with organic function layer 3.Luminescent layer 34 comprises blue light fluorescence radiation layer 341, ruddiness phosphorescence luminescent layer 343 and green glow phosphorescence luminescent layer 344.
Fig. 4 is that a kind of organic function layer that the present invention proposes is the structural representation of the white light organic electroluminescent device of sandwich construction, and wherein 1 is transparent substrates, the 2nd, and anode layer, the 3rd, organic function layer, the 4th, cathode layer, the 90th, driving power.Organic function layer 3 comprises hole injection layer 31, hole transmission layer 32, electronic barrier layer 33, luminescent layer 34, hole blocking layer 35, electron transfer layer 36 and electron injecting layer 37.
Fig. 5 is the structural representation of the specific embodiment of the invention one described a kind of white light organic electroluminescent device, wherein 1 is transparent substrates, the 2nd, and anode layer, the 4th, cathode layer, the 90th, driving power, the 31st, hole injection layer, the 34th, luminescent layer, the 35th, hole blocking layer, the 36th, electron transfer layer.Wherein luminescent layer 34 comprises blue light fluorescence radiation layer 341 and phosphorescence luminescent layer 342.
Fig. 6 is the structural representation of the specific embodiment of the invention two described a kind of white light organic electroluminescent devices, wherein 1 is transparent substrates, the 2nd, and anode layer, the 4th, cathode layer, the 90th, driving power, the 31st, hole injection layer, the 34th, luminescent layer, the 36th, electron transfer layer.Wherein luminescent layer 34 comprises blue light fluorescence radiation layer 341 and phosphorescence luminescent layer 342.
Fig. 7 is the structural representation of the specific embodiment of the invention three described a kind of white light organic electroluminescent devices, and wherein 1 is transparent substrates, the 2nd, and anode layer, the 4th, cathode layer, the 90th, driving power, the 31st, hole injection layer, the 34th, luminescent layer, the 36th, electron transfer layer, the 37th, electron injecting layer.Wherein luminescent layer 34 comprises blue light fluorescence radiation layer 341, ruddiness phosphorescence luminescent layer 343 and green glow phosphorescence luminescent layer 344.
Fig. 8 is the structural representation of the specific embodiment of the invention four described a kind of white light organic electroluminescent devices, wherein 1 is transparent substrates, the 2nd, and anode layer, the 4th, cathode layer, the 90th, driving power, the 31st, hole injection layer, the 34th, luminescent layer, the 36th, electron transfer layer.
Fig. 9 is the brightness-voltage-efficiency characteristic curve test result of the specific embodiment of the invention two described a kind of white light organic electroluminescent devices.
Figure 10 is the luminescent spectrums of the specific embodiment of the invention two described a kind of white light organic electroluminescent devices under the 10V forward voltage.
Embodiment
Hereinafter will describe exemplary embodiment of the present invention in detail.Yet the present invention is not limited to following public execution mode, and can show with various forms.Therefore, the present embodiment scope of the present invention that is used for comprehensively openly the present invention and accuses fully to those of ordinary skill in the art.
Embodiment one
As shown in Figure 5, organic function layer 3 comprises that luminescent layer 34 comprises blue light fluorescence radiation layer 341 and phosphorescence luminescent layer 342 with hole injection layer 31, luminescent layer 34, hole blocking layer 35, electron transfer layer 36.Hole injection layer 31 materials are CuPc.Blue light fluorescence radiation layer 341 material are NPB.Phosphorescence luminescent layer 342 sends yellow phosphorescence, and material adopts (t-bt)
2Ir (acac).Carrier material adopts CBP in the luminescent layer 34.Hole blocking layer 35 materials are BCP.Electron transfer layer 36 materials are Alq
3 Transparent substrates 1 material glass.Anode layer 2 material ITO.Cathode layer 4 materials LiF thin layer and metal A l.The entire device structure can be described as:
Glass/ITO/CuPc/CBP:NPB/CBP:(t-bt)
2Ir(acac)/BCP/Alq
3/LiF/Al，
Or
Glass/ITO/CuPc/CBP:(t-bt)
2Ir(acac)/CBP:NPB/BCP/Alq
3/LiF/Al。
Its preparation method is as follows:
1. utilize alkaline detergent, acetone soln, ethanolic solution and deionized water that transparent conduction base sheet ito glass 1 is carried out ultrasonic cleaning, place it in the oven for drying in the clean room after the cleaning.Wherein the ITO film above the glass substrate is as the anode layer 2 of device, and the square resistance of ITO film is 10～15 Ω/, and thickness is 150nm.
2. the ito glass with above-mentioned cleaning, drying places in the vacuum chamber, is evacuated to 1 * 10
-5～1 * 10
-6Pa carries out the preliminary treatment that the low energy oxygen ion beam bombards to ito glass, with manipulator ito glass is sent to the organic evaporating cavity.
3. keep the vacuum degree 1 * 10 in above-mentioned organic cavity
-5Pa, the beginning organic thin-film vapor deposition.At first evaporation one deck CuPc is as the hole injection layer 31 of device on above-mentioned ITO film, and the evaporation speed of CuPc film is 0.03nm/s, and thickness is 15nm.Evaporation NPB is as blue light fluorescence radiation layer 341 on above-mentioned CuPc hole injection layer in continuation, and evaporation rate is 0.04nm/s, and thickness is 15nm.
4. on the device of the above-mentioned NPB of evaporation film, begin evaporation CBP:(t-bt)
2Ir (acac) is as 342, two kinds of material C BP of phosphorescence luminescent layer and (t-bt)
2Ir (acac) is placed on two respectively and can accurately controls separately in the evaporation boat of temperature.With the evaporation rate of high-precision crystal oscillator test material, controlling its doping ratio is 2%, and layer thickness is 30nm.
5. continue the hole blocking layer 35 of evaporation BCP layer as device on the device of the above-mentioned luminescent layer of phosphorescence 342, evaporation rate is 0.04nm/s, and thickness is 20nm.Then evaporating Al q
3As electron transfer layer 36, evaporation rate is 0.1nm/s, and thickness is 20nm.Behind the intact organic function layer of evaporation, do not destroy the vacuum degree of cavity, the ITO substrate is sent to the evaporation of metal cavity from the organic evaporating cavity by manipulator.
6. in the evaporation of metal cavity, at first evaporation LiF thin layer is as the resilient coating of cathode layer 4, and by DC heating evaporation boat, material at high temperature evaporates, and speed is 0.03nm/s, and thickness is 1nm.Continue the metal level of another evaporation boat evaporating Al of heating as cathode layer 4, evaporation rate is 0.1nm/s, and thickness of electrode is 100nm.
7. ready-made device is sent to glove box and encapsulates, be coated with UV glue earlier, uv-exposure 2min can finish encapsulation then, and glove box is 99.999% nitrogen atmosphere.
8. electric current-the voltage of test component-light characteristic, optical parametrics such as the luminescent spectrum of test component and chromaticity coordinates simultaneously.
Device brightness-voltage-efficiency curve is referring to accompanying drawing 9, and the luminescent spectrum that device presses down in the 10V forward drive is referring to accompanying drawing 10.
Embodiment two
As shown in Figure 6, organic function layer 3 comprises that luminescent layer 34 comprises blue light fluorescence radiation layer 341 and phosphorescence luminescent layer 342 with hole injection layer 31, luminescent layer 34, electron transfer layer 36.Hole injection layer 31 materials are CuPc.Blue light fluorescence radiation layer 341 material are DPVBi.Phosphorescence luminescent layer 342 sends red phosphorescent, and material adopts (btp)
2Ir (acac).Carrier material adopts CDBP in the luminescent layer 34.Electron transfer layer 36 materials are Alq
3 Transparent substrates 1 material glass.Anode layer 2 material ITO.The cathode layer 4 materials alloy of Mg and Ag.The entire device structure can be described as:
Glass/ITO/CuPc/DPVBi/CDBP:(btp)
2Ir(acac)/Alq
3/Mg:Ag，
Or
Glass/ITO/CuPc/CDBP:(btp)
2Ir(acac)/CDBP:DPVBi/Alq
3/Mg:Ag。
The preparation of devices flow process is similar to execution mode one.
Embodiment three
As shown in Figure 7, organic function layer 3 comprises that luminescent layer 34 comprises blue light fluorescence radiation layer 341, ruddiness phosphorescence luminescent layer 343 and green glow phosphorescence luminescent layer 344 with hole injection layer 31, luminescent layer 34, electron transfer layer 36 and hole blocking layer 37.Hole injection layer 31 materials are CuPc.Blue light fluorescence radiation layer 341 material are NPB.Ruddiness phosphorescence luminescent layer 343 materials adopt (btp)
2Ir (acac).Green glow phosphorescence luminescent layer 344 materials adopt Ir (ppy)
3Carrier material adopts CBP in the luminescent layer 34.Electron transfer layer 36 materials are BCP.Hole blocking layer 37 materials are BCP.Transparent substrates 1 material glass.Anode layer 2 material ITO.Cathode layer 4 materials LiF thin layer and metal A l.The entire device structure can be described as:
Glass/ITO/CuPc/CBP:NPB/CBP:Ir(ppy)
3/CBP:(btp)
2Ir(acac)/BCP/LiF/Al。
Wherein, CBP:NPB/CBP:Ir (ppy)
3/ CBP:(btp)
2Three layers of position relation of Ir (acac) can be exchanged arbitrarily.
The preparation of devices flow process is similar to execution mode one.
Embodiment four
As shown in Figure 8, organic function layer 3 comprises with hole injection layer 31, luminescent layer 34 and electron transfer layer 36, the individual layer composite layer that luminescent layer 34 is made up of carrier material, the fluorescent material that sends blue light, phosphorescent light-emitting materials, wherein: the fluorescent material that carrier material is PVK, send blue light is that NPB, phosphorescent light-emitting materials are Ir (ppy)
3(btp)
2Ir (acac).Hole injection layer 31 material polymers dopant material PEDOT:PSS.Electron transfer layer 36 materials are Alq
3 Transparent substrates 1 material glass.Anode layer 2 material ITO.Cathode layer 4 materials LiF thin layer and metal A l.The entire device structure can be described as:
Glass/ITO/PEDOT:PSS/PVK:NPB:Ir(ppy)
3:(btp)
2Ir(acac)/Alq
3/LiF/Al。
The preparation of devices flow process is similar to execution mode one.
Claims (16)
1, a kind of white light organic electroluminescent device, comprise transparent substrates (1), anode layer (2), organic function layer (3) and cathode layer (4), wherein anode layer (2) is positioned at transparent substrates (1) surface, and organic function layer (3) is positioned between anode layer (2) and the cathode layer (4); Organic function layer (3) comprises luminescent layer (34) at least; It is characterized in that the composite layer that described luminescent layer (34) is made up of carrier material, the fluorescent material that sends blue light and phosphorescent light-emitting materials; Under the driving of additional power source (90), device sends white light.
2, a kind of white light organic electroluminescent device according to claim 1 is characterized in that, described luminescent layer (34) is by carrier material, sends the fluorescent material of blue light, the individual layer composite layer that phosphorescent light-emitting materials is formed; Under the driving of additional power source (90), device sends white light.
3, a kind of white light organic electroluminescent device according to claim 1 is characterized in that, described luminescent layer (34) is by carrier material, sends the fluorescent material of blue light, the double-layer composite material layer that phosphorescent light-emitting materials is formed; Described double-layer composite material layer comprises by carrier material, send blue light fluorescence radiation layer (341) that the fluorescent material of blue light forms and the phosphorescence luminescent layer of being made up of carrier material, phosphorescent light-emitting materials (342); Under the driving of additional power source (90), blue light fluorescence radiation layer (341) sends the blue light of certain wave-length coverage, and phosphorescence luminescent layer (342) sends the light with the blue light-emitting complementation of blue light fluorescence radiation layer (341) institute.
4, a kind of white light organic electroluminescent device according to claim 1 is characterized in that, described luminescent layer (34) is by carrier material, sends the fluorescent material of blue light, the multilayer materials layer that phosphorescent light-emitting materials is formed; Described multilayer materials layer comprises by carrier material, send blue light fluorescence radiation layer (341) that the fluorescent material of blue light forms and ruddiness phosphorescence luminescent layer of being made up of carrier material, ruddiness phosphorescent light-emitting materials (343) and the green glow phosphorescence luminescent layer of being made up of carrier material, green glow phosphorescent light-emitting materials (344); Under the driving of additional power source (90), blue light fluorescence radiation layer (341), ruddiness phosphorescence luminescent layer (343) and green glow phosphorescence luminescent layer (344) send blue light, ruddiness and the green glow in the three primary colors respectively.
5, a kind of white light organic electroluminescent device according to claim 1, it is characterized in that, described organic function layer (3) also comprises in hole injection layer (31), hole transmission layer (32), electronic barrier layer (33), hole blocking layer (35), electron transfer layer (36) and the electron injecting layer (37) one or more layers except that comprising luminescent layer (34) at least.
6, a kind of white light organic electroluminescent device according to claim 1 is characterized in that, described transparent substrates (1) is glass, flexible substrate or thin metal.
7, a kind of white light organic electroluminescent device according to claim 6 is characterized in that, described flexible substrate is polyesters or poly-phthalimide compounds.
8, a kind of white light organic electroluminescent device according to claim 1, it is characterized in that, described anode layer (2) material adopts inorganic material, specifically be the higher metallic films of work function such as metal-oxide films such as ito thin film, zinc-oxide film or zinc tin oxide film or gold, copper, silver, preferably adopt ito thin film.
9, a kind of white light organic electroluminescent device according to claim 1 is characterized in that, described anode layer (2) material adopts PEDOT:PSS or PANI class organic conductive polymer.
10, a kind of white light organic electroluminescent device according to claim 1 is characterized in that, described cathode layer (4) comprises one deck resilient coating and metal level; Described cushioning layer material is LiF or CsF, and described metal layer material is the alloy firm of the lower metallic film of work functions such as lithium, magnesium, calcium, strontium, aluminium, indium or they and copper, gold, silver.
11, a kind of white light organic electroluminescent device according to claim 5 is characterized in that, described electron transfer layer (36) and hole transmission layer (32) material adopt metal organic complex, aromatic condensed ring class, adjacent phenanthrene to cough up beautiful jade Lei Huo oxadiazole compounds; The material of described hole blocking layer (35) is poly N-vinyl carbazole, BCP, two (2-methyl-8-quinoline acid group closes) tri-phenyl-silane alcohol (silanolate) aluminium (III), two (2-methyl-8-quinoline acid group closes) 4-phenol aluminium (III) or two (2-methyl-8-quinoline acid group closes) 4-phenylphenol aluminium (III).
12, according to claim 2,3 or 4 described a kind of white light organic electroluminescent devices, it is characterized in that, the described fluorescent material that sends blue light comprises small molecule material or polymeric material, preferably NPD, DPVBi, Balq, BCzVB, Perylene or BczVBi etc.; Described phosphorescent light-emitting materials is the complex of heavy metals such as small molecule material or polymeric material, especially Ir, Pt, Os, Eu, Re, Au, preferably based on the complex of heavy metal Ir and Pt.
13, according to claim 3,5,6,8,10,11 and 12 described a kind of white light organic electroluminescent devices, it is characterized in that, described organic function layer (3) comprises that luminescent layer (34) comprises blue light fluorescence radiation layer (341) and phosphorescence luminescent layer (342) with hole injection layer (31), luminescent layer (34), hole blocking layer (35), electron transfer layer (36); Described hole injection layer (31) material is CuPc; Described blue light fluorescence radiation layer (341) material is NPB; Described phosphorescence luminescent layer (342) sends yellow phosphorescence, and material adopts (t-bt)
2Ir (acac); Carrier material adopts CBP in the described luminescent layer (34); Described hole blocking layer (35) material is BCP; Described electron transfer layer (36) material is Alq
3Described transparent substrates (1) material glass; Described anode layer (2) material ITO; Described cathode layer (4) material LiF thin layer and metal A l.
14, according to claim 3,5,6,8,10,11 and 12 described a kind of white light organic electroluminescent devices, it is characterized in that, described organic function layer (3) comprises that described luminescent layer (34) comprises blue light fluorescence radiation layer (341) and phosphorescence luminescent layer (342) with hole injection layer (31), luminescent layer (34), electron transfer layer (36).Described hole injection layer (31) material is CuPc; Described blue light fluorescence radiation layer (341) material is DPVBi; Described phosphorescence luminescent layer (342) sends red phosphorescent, and material adopts (btp)
2Ir (acac); Carrier material adopts CDBP in the luminescent layer (34); Described electron transfer layer (36) material is Alq
3Described transparent substrates (1) material glass; Described anode layer (2) material ITO; Described cathode layer (4) the material alloy of Mg and Ag.
15, according to claim 4,5,6,8,10,11 and 12 described a kind of white light organic electroluminescent devices, it is characterized in that, described organic function layer (3) comprises that described luminescent layer (34) comprises blue light fluorescence radiation layer (341), ruddiness phosphorescence luminescent layer (343) and green glow phosphorescence luminescent layer (344) with hole injection layer (31), luminescent layer (34), electron transfer layer (36) and hole blocking layer (37); Described hole injection layer (31) material is CuPc; Described blue light fluorescence radiation layer (341) material is NPB; Described ruddiness phosphorescence luminescent layer (343) material adopts (btp)
2Ir (acac); Described green glow phosphorescence luminescent layer (344) material adopts Ir (ppy)
3Carrier material adopts CBP in the described luminescent layer (34); Described electron transfer layer (36) material is BCP; Described hole blocking layer (37) material is BCP; Described transparent substrates (1) material glass; Described anode layer (2) material ITO; Described cathode layer (4) material LiF thin layer and metal A l.
16, according to claim 2,5,6,8,10,11 and 12 described a kind of white light organic electroluminescent devices, it is characterized in that, described organic function layer (3) comprises with hole injection layer (31), luminescent layer (34) and electron transfer layer (36), the individual layer composite layer that described luminescent layer (34) is made up of carrier material, the fluorescent material that sends blue light, phosphorescent light-emitting materials, wherein: described carrier material is that PVK, the described fluorescent material that sends blue light are that NPB, described phosphorescent light-emitting materials are Ir (ppy)
3(btp)
2Ir (acac); Described hole injection layer (31) material polymers dopant material PEDOT:PSS; Described electron transfer layer (36) material is Alq
3Described transparent substrates (1) material glass; Described anode layer (2) material ITO; Described cathode layer (4) material LiF thin layer and metal A l.
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| US7994700B2 (en) | 2008-02-21 | 2011-08-09 | Canon Kabushiki Kaisha | Image display apparatus |
| CN102222776A (en) * | 2011-06-02 | 2011-10-19 | 上海大学 | White-light organic light emitting device with graded junction light emitting layer structure and preparation method of white-light organic light emitting device |
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| CN102709483A (en) * | 2012-06-26 | 2012-10-03 | 吉林大学 | Single-layer white organic light emitting device |
| CN102779950A (en) * | 2012-08-14 | 2012-11-14 | 中国科学院长春应用化学研究所 | Organic LED (light-emitting diode) |
| CN104282843A (en) * | 2014-10-30 | 2015-01-14 | 中国科学院长春应用化学研究所 | Yellow organic light-emitting device and manufacturing method thereof |
| CN112018256A (en) * | 2020-09-07 | 2020-12-01 | 江苏仕邦柔性电子研究院有限公司 | OLED display panel with fluorescent emitter and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7994700B2 (en) | 2008-02-21 | 2011-08-09 | Canon Kabushiki Kaisha | Image display apparatus |
| CN102222776A (en) * | 2011-06-02 | 2011-10-19 | 上海大学 | White-light organic light emitting device with graded junction light emitting layer structure and preparation method of white-light organic light emitting device |
| CN102222776B (en) * | 2011-06-02 | 2013-01-09 | 上海大学 | White-light organic light emitting device with graded junction light emitting layer structure and preparation method of white-light organic light emitting device |
| CN102280592A (en) * | 2011-08-18 | 2011-12-14 | 北京交通大学 | Luminous color adjustable organic electroluminescent device based on single luminous material |
| CN102709483A (en) * | 2012-06-26 | 2012-10-03 | 吉林大学 | Single-layer white organic light emitting device |
| CN102779950A (en) * | 2012-08-14 | 2012-11-14 | 中国科学院长春应用化学研究所 | Organic LED (light-emitting diode) |
| CN102779950B (en) * | 2012-08-14 | 2015-05-20 | 中国科学院长春应用化学研究所 | Organic LED (light-emitting diode) |
| CN104282843A (en) * | 2014-10-30 | 2015-01-14 | 中国科学院长春应用化学研究所 | Yellow organic light-emitting device and manufacturing method thereof |
| CN104282843B (en) * | 2014-10-30 | 2017-04-19 | 中国科学院长春应用化学研究所 | Yellow organic light-emitting device and manufacturing method thereof |
| CN112018256A (en) * | 2020-09-07 | 2020-12-01 | 江苏仕邦柔性电子研究院有限公司 | OLED display panel with fluorescent emitter and preparation method thereof |
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