CN100505373C - Performance stabilized organic light-emitting device - Google Patents
Performance stabilized organic light-emitting device Download PDFInfo
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- CN100505373C CN100505373C CNB200710048827XA CN200710048827A CN100505373C CN 100505373 C CN100505373 C CN 100505373C CN B200710048827X A CNB200710048827X A CN B200710048827XA CN 200710048827 A CN200710048827 A CN 200710048827A CN 100505373 C CN100505373 C CN 100505373C
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Abstract
The invention discloses an organic electroluminescent device having stable performance, which includes a transparent substrate, a positive layer and a negative layer, wherein a kind of electrode is disposed on the surface of the transparent substrate, and further includes an organic functional layer disposed between the positive layer and the negative layer, wherein the organic functional layer at least includes a luminescent layer which can illuminate driven by outside source, and the luminescent material effectively restrains the phenomena that fluorenes functional group loses electron to convert into keto by importing a functional group capable of absorbing electron and with conjugate structure thereby improving the stability of luminescent performance, thus the saturation color purity and the stability of luminescent color of the device can be improved.
Description
Technical field
The present invention relates to technical field of organic electroluminescence in the electronic devices and components, relate to a kind of organic electroluminescence device of stable performance, its emission spectrum comprises from blue light to the red light wavelength scope.
Background technology
As today of 21st century of informationized society, people are more and more higher to the degree of dependence that connects man-machine tie-information display spare, and the display device of definition height, stable performance has also just become one of numerous goal in research of human pursuit.Since the middle of last century, along with the continuous progress of Display Technique and continuing to bring out of new technology, the display device industry has progressively realized the development of great-leap-forward.Experiencing from black and white, colour, super flat, pure flat cathode-ray tube display, after the innovation of the LCD that yields unusually brilliant results by now (liquid crystal display), PDP (plasma demonstration) flat-panel screens, its industry size is increasing, and application is also more and more wider.And in the demonstration field, organic electroluminescence device (OLED) because have thinner lighter, active illuminating, no visual angle problem, high definition, high brightness, response is quick, energy consumption is low, temperature resistant range is wide, can realize soft demonstration, manufacture craft is simple and premium properties such as radiationless, received the very big concern of industry, and begun to step into the industrialization stage.The R﹠D institution of many developed countries and team have dropped into exploration and the experimental study that great effort carries out correlation theory, and have obtained breakthrough.Each big industry giant has in the world successively released oneself OLED product as Sony, Samsung, Philip etc.
Organic electroluminescent is meant film that luminous organic material constitutes under electric field action, is subjected to electric current and electric field excites and luminous phenomenon, and it is an a kind of luminescence process that electric energy is converted into luminous energy.The device made of principle is called organic electroluminescence device in view of the above, is called for short OLED.Its luminous mechanism briefly be by negative electrode injected electrons and anode injected holes under effect of electric field and the conduction of jumping in opposite directions.When two kinds of electric charges reach a unimolecule, just may form the excitation state of molecule, promptly so-called exciton.When exciton is got back to ground state from excitation state, the form of its energy difference with photon discharged.The emission wavelength that different energy differences is corresponding different, thereby show different glow colors.
Organic electroluminescent research starts from the sixties in 20th century.1963, people's reported first such as the Pope of New York Univ USA the electro optical phenomenon of organic material monocrystalline anthracene, but because the thickness of monocrystalline luminescent layer reaches 20 μ m, its driving voltage is up to 400V, therefore fail to cause extensive studies interest, but the prelude of organic electroluminescent research has been opened in this work.Nineteen eighty-two, Vincett research group prepares the anthracene single crystal film that successful thickness is 0.6 μ m, operating voltage is dropped in the 30V, but the quantum efficiency of device is still very low, so still be not subject to people's attention.
Up to 1987, people such as Deng of Kodak high official position were summing up the device of having invented the sandwich structure superthin structure on forefathers' the basis: they adopt, and fluorescence efficiency is very high, electronic transmission performance and the good organic small molecule material oxine aluminium (Alq of filming performance
3), with the aromatic diamine with hole transport characteristic (diamine) derivative make low driving voltage (＜10V), high-quantum efficiency (1%), high brightness (〉 1000cd/m
2) organic EL device, this breakthrough has remotivated the enthusiasm of people for organic EL, makes people see the dawn of organic electroluminescence device as flat-panel display device of new generation.From then on, organic electroluminescent has been gone on the road of fast development, and all many-sides such as people are synthetic at material, device architecture design, carrier transport have been carried out deep research, make the performance of organic electroluminescence device move closer to the practicability level.Nineteen ninety Richard.Friend group has reported high molecule electroluminescent phenomenon under low-voltage, has opened the frontier of the organic flat panel display research of macromolecule; In the same year, Cambridge University finds that conducting polymer composite PPV has good electroluminescent properties and utilizes spin-coating method to make polymer OLED, and the research and development of electroluminescent organic material are generalized to the high molecular polymer field; 1997, Stephan.
Deng discovery phosphorescence electro optical phenomenon, break through the electroluminescent organic material quantum efficiency and be lower than 25% restriction, make the research of organic flat-panel display device enter a new period ... in short 10 years, the organic electroluminescent technology inorganic display material 30 years of development courses of having passed by, and the industrialization impetus is swift and violent unusually.
Although the OLED technology has obtained significant progress in recent years, still there are a lot of bottlenecks in present technology in the organic electroluminescent field.No matter be that organic electroluminescence device is realized full-colorization demonstration, still use as single mains lighting supply, the preparation of the device of three kinds of independent color of RGB all is vital, and their constructional simplicity, high brightness, high efficiency, long-life all are the key factors that influences device practicability; Especially can realize the luminous of two kinds or three kinds devices simultaneously with the structure simple device architecture of trying one's best, for the generation of the white light parts of simple structure is paved the way.
At present a class material that generally adopts in organic electroluminescence device institute is fluorenes micromolecular or the macromolecular material that its construction unit formation is arranged, such material when solid-state fluorescence quantum efficiency up to 60%～80%, the material of being used always for the preparation of high brightness, high efficiency blue-light device.But, because fluorenes class functional group is an electron rich group, so luminescent device under long-time the driving, very easily loses electronics and transforms ketone, cause the emission wavelength red shift of device, had a strong impact on the luminous heavy shade purity of device and the stability of glow color performance index.
Summary of the invention
Technical problem to be solved by this invention is that how a kind of stable performance organic electroluminescence device purpose is provided is to propose the novel fluorescent material of a class, can be used as the functional material in the organic luminous layer, can be thereby expanded for the kind of the organic compound for preparing the organic luminescent device use, material among the present invention as luminous element, comprise and become luminescent layer separately and as the dyestuff that mixes and luminous, the device that this material constitutes, under long-time driven, compare with the fluorenes class material of routine, wavelength is highly stable; Simultaneously, such material also has charge carrier injection preferably and transmittability, and The compounds of this invention all has stronger fluorescence in liquid and solid film, have quite high heat, light, physical chemistry, electrochemistry equistability simultaneously again.
Technical problem proposed by the invention is to solve like this: the organic electroluminescence device of constructing a kind of stable performance, comprise transparent substrates, anode layer and cathode layer, wherein a kind of electrode is positioned at the transparent substrates surface, also comprise the organic function layer that is arranged between described anode layer and the cathode layer, which comprises at least luminescent layer, this luminescent layer is luminous under the driving of additional power source, described luminescent layer can be the fluorescent material layer that sends blue light, green glow, gold-tinted and orange light, under the driving of described additional power source, send corresponding monochromatic light; Luminescent layer can be the doping system that sends gold-tinted or green glow, under the driving of described additional power source, sends gold-tinted or green glow; Luminescent layer can also be that the fluorescent material layer that sends blue light is formed jointly with the fluorescent material or the doping system that send gold-tinted or green glow, under the driving of described additional power source, send white light or cyan light, it is characterized in that: described fluorescent material layer has following structural framework:
Wherein, R is an alkyl substituent, and expression formula is C
nH
2n+1, n=1,2,3,4......; The functional group with electron-withdrawing power of conjugated structure is that aromatic radical is (as phenyl, naphthyl etc.), heterocyclic substituent (as furans, thiophene, pyrroles, pyridine, pyrans, quinoline, indoles, carbazole) and the electron withdraw group introduced thereon, as fluorine, chlorine, cyano group, carboxyl etc.The molecular configuration of employed representative materials is shown in 1～18:
Organic electroluminescence device according to stable performance provided by the present invention, it is characterized in that, described transparent substrates can be glass or flexible substrate or sheet metal etc., and wherein flexible substrate can be ultra-thin glass, polyesters or poly-phthalimide compounds etc.; Described anode layer can be metal-oxide film or metallic film, and this metal-oxide film can be ito thin film or zinc-oxide film or zinc tin oxide film, and this metallic film also can be the higher metallic films of work function such as gold, copper, silver; Described anode layer also can be PEDOT:PSS or PANI class organic conductive polymer; Described anode implanted layer and resilient coating can be the inorganic molecules compounds or have the organic compound of low the highest occupied energy level (HOMO) energy level, as phthalein cyanogen copper (CuPc) and silicon dioxide (SiO
2), described cathode layer comprises resilient coating and metal level, described cushioning layer material is the inorganic molecules compound or has the organic compound of high minimum unoccupied energy level (LUMO) energy level, for example LiF or CsF, described metal layer material is metallic film or alloy firm, and this metallic film can be the alloy firm of the lower metallic film of lithium or work functions such as magnesium or calcium or strontium or aluminium or indium or they and copper or gold or silver etc.
Organic electroluminescence device according to stable performance provided by the present invention is characterized in that, described electron transfer layer and implanted layer can be metal complex material Huo person oxadiazole electron-like transferring material, perhaps imidazoles electron transport material; Described hole mobile material can be aromatic diamine compounds or star triphenyl amine compound, or carbazole polymer.
Organic electroluminescence device according to stable performance provided by the present invention is characterized in that, described metal complex material can be oxine aluminium (Alq
3) or oxine gallium (Gaq
3) or two [2-(2-hydroxy phenyl-1)-pyridine] beryllium (Bepp
2) etc., transmission of Suo Shu oxadiazole electron-like and injection material can be 2-(4-diphenyl)-5-(4-2-methyl-2-phenylpropane base)-1,3,4-oxadiazole (PBD), described imidazoles electric transmission and injection material can be 1,3,5-three (N-phenyl-2-benzimidazolyl-2 radicals) benzene (TPBI); Described aromatic diamine compounds can be N, N '-two-(3-aminomethyl phenyl)-N, N '-diphenyl-[1,1 '-xenyl]-4,4 '-diamines (TPD) or N, N '-two (3-naphthyl)-N, N '-diphenyl-[1,1 '-diphenyl]-4,4 '-diamines (NPB), described star triphenyl amine compound can be three-[4-(5-phenyl-2-thienyl) benzene] amine (PTDATA series), and described carbazole polymer can be polyvinylcarbazole (PVK).
Organic electroluminescence device according to stable performance provided by the present invention, it is characterized in that, described blue light emitting material can be aromatic diamine compounds or star triphenyl amine compound, or carbazole polymer, perhaps other fluorenes micromoleculars or the polymer be made up of fluorenes class monomer.
Organic electroluminescence device according to stable performance provided by the present invention, it is characterized in that, described Yellow light emitting material is to have big energy gap, the spectral region broad, the material that can cover the object absorption spectra is made main body, red, weld is done the object gained that mixes jointly, and material of main part can be metal complex material such as oxine aluminium (Alq
3) etc., 4,4 '-two (2, the 2-diphenylethyllene)-1,1 '-biphenyl etc.Guest materials can be yellow, red dyestuff, this dyestuff can be 5,6,11,12-tetraphenyl fourth, the 4-cyanogen methene-2-tert-butyl group-6-(1,1,7,7-tetramethyl julolidine groups-9-Ene alkynyl base-4H-pyrans), 4-dicyano methene-2-methyl-6 pair dimethylamino styryl-pyrans etc.The Yellow light emitting material also can be material 3 (5,6,7,8-tetrafluoro quinoxaline) and other more stable materials of describing among the present invention.
The preparation method of the organic electroluminescence device of stable performance provided by the present invention may further comprise the steps:
1. utilize washing agent, ethanolic solution and deionized water that transparent substrates is carried out ultrasonic cleaning, clean the back and dry up with drying nitrogen;
2. transparent substrates is carried out the preparation of electrode in the vacuum evaporation chamber, described electrode comprises anode layer or cathode layer;
3. the transparent substrates that will prepare electrode is in vacuum chamber, under oxygen pressure ring border to carrying out preliminary treatment;
4. the transparent substrates after will handling begins to carry out the evaporation of organic film in the vaporization chamber of condition of high vacuum degree, according to device architecture evaporation organic function layer successively, described organic function layer comprise luminescent layer, carrier blocking layers and (or) implanted layer and resilient coating;
5. finish another electrode is carried out in the back in the vacuum evaporation chamber preparation at the organic layer evaporation, described electrode comprises cathode layer or anode layer;
6. ready-made device is encapsulated at glove box, glove box is a nitrogen atmosphere;
7. electric current-the voltage of test component-light characteristic, the luminescent spectrum parameter of test component simultaneously.
Also have another kind of preparation method, may further comprise the steps:
1. utilize washing agent, ethanolic solution and deionized water that transparent substrates is carried out ultrasonic cleaning, clean the back and dry up with drying nitrogen;
2. transparent substrates is carried out the preparation of electrode in the vacuum evaporation chamber, described electrode comprises anode layer or cathode layer;
3. the transparent substrates that will prepare electrode is at vacuum chamber, under oxygen pressure ring border to carrying out preliminary treatment;
4. the transparent substrates after will handling is carried out the spin coating of organic film in spin coater, according to device architecture spin coating organic function layer successively, described organic function layer comprise luminescent layer, carrier blocking layers and (or) implanted layer and resilient coating;
5. finish to carry out in the vaporization chamber of back at condition of high vacuum degree the preparation of another electrode in the organic layer spin coating, described electrode comprises cathode layer or anode layer;
6. ready-made device is encapsulated at glove box, glove box is a nitrogen atmosphere;
7. electric current-the voltage of test component-light characteristic, the luminescent spectrum parameter of test component simultaneously.
Organic electroluminescence device provided by the present invention, in the luminescent layer by introducing the functional group with electron-withdrawing power of conjugated structure, effectively having suppressed fluorenes class functional group loses electronics and transforms to ketone group, strengthen the stability of luminescent properties, thereby improved the luminous heavy shade purity of device and the stability of glow color.What is more important, luminous organic material are that material selects to provide broad scope with its intrinsic diversity, by to the design of organic molecular structure, assemble and cut out, can satisfy many-sided different needs and be easy to realize that large tracts of land shows.
Description of drawings
Fig. 1 is the structural representation of the organic electroluminescence device of stable performance provided by the present invention;
Fig. 2 is the structural representation of embodiment 1-3 provided by the present invention;
Fig. 3 is the structural representation of embodiment 4-6 provided by the present invention;
Fig. 4 is the structural representation of embodiment 7 provided by the present invention;
Fig. 5 is the structural representation of embodiment 8 provided by the present invention;
Fig. 6 is the test curve figure of the luminescent spectrum of device under the 10V forward voltage described in the embodiment 8 provided by the present invention.
Wherein, 1, transparent substrates, 2, anode layer, 3, organic function layer, 4, cathode layer, 5, additional power source, 31, hole transmission layer, 32, monochromatic luminescent layer, 33, electron transfer layer, 34, hole blocking layer, 321, blue light-emitting layer, 322, gold-tinted, orange smooth luminescent layer (can doublely do electron transfer layer).
Embodiment
The present invention is further illustrated below in conjunction with accompanying drawing.
Technical scheme of the present invention provides the organic electroluminescence device of a kind of blue light to red range, as shown in Figure 1, 2, the structure of device comprises transparent substrates 1, anode layer 2, organic function layer 3, 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, and organic function layer 3 can comprise hole transmission layer 31, luminescent layer 32 and electron transfer layer 33, device is luminous under the driving of additional power source 5.
As shown in Figure 3, the structure of device comprises transparent substrates 1, anode layer 2, organic function layer 3, cathode layer 4, wherein anode layer 2 is positioned at transparent substrates 1 surface, organic function layer 3 is between anode layer 2 and cathode layer 4, organic function layer 3 can comprise hole transmission layer 31, luminescent layer 32, and device is luminous under the driving of additional power source 5.
As shown in Figure 4, the structure of device comprises transparent substrates 1, anode layer 2, organic function layer 3, 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, and organic function layer 3 can comprise hole transmission layer 31, luminescent layer 321, hole blocking layer 34 and gold-tinted or orange smooth luminescent layer 322, electron transfer layer 33, device emits white light under the driving of additional power source 5.
Luminescent layer 32 materials are micromolecule main body luminescent material among the present invention, can send blue light, green glow, gold-tinted and orange light, it guides the functional group compound of fluorene class material with electron-withdrawing power into conjugated structure, along with the increase of the number of electron withdraw group, improve the stability of photoluminescence and the saturability of material.And having good charge carrier injects and transmission performance.
Electron transfer layer 33 materials among the present invention are the plane aromatic compound with big conjugated structure, and they have electron acceptability preferably mostly, can effectively transmit electronics again simultaneously under certain bias voltage.It comprises metal complex material such as oxine aluminium (Alq
3), oxine gallium (Gaq
3), two [2-(2-hydroxy phenyl-1)-pyridine] beryllium (Bepp
2) Deng ， oxadiazole electron-like transferring material, as 2-(4-diphenyl)-5-(4-2-methyl-2-phenylpropane base)-1,3,4-oxadiazole (PBD), the imidazoles electron transport material, as 1,3,5-three (N-phenyl-2-benzimidazolyl-2 radicals) benzene (TPBI).
Hole blocking layer 34 materials are 1 among the present invention, the adjacent phenanthroline derivative of 10-BCP, and 1,3,5-three (N-phenyl-2-benzimidazole) benzene TPBI and organic boron etc. have the material of hole barrier effect.
Blue light-emitting layer 321 materials among the present invention can be aromatic diamine compounds or star triphenyl amine compound, or carbazole polymer, perhaps other fluorenes micromoleculars or the polymer be made up of fluorenes class monomer.
Gold-tinted among the present invention or orange smooth luminescent layer 322 materials are to have big energy gap, the spectral region broad, and the material that can cover the object absorption spectra is made main body, redness, yellow or orange-yellow dyestuff is done the object gained that mixes jointly.Material of main part can be metal complex material such as oxine aluminium (Alq
3), 4,4 '-two (2, the 2-diphenylethyllene)-1,1 '-biphenyl etc.Guest materials can be yellow, red dyestuff, this dyestuff can be 5,6,11,12-tetraphenyl fourth, the 4-cyanogen methene-2-tert-butyl group-6-(1,1,7,7-tetramethyl julolidine groups-9-Ene alkynyl base-4H-pyrans), 4-dicyano methene-2-methyl-6 pair dimethylamino styryl-pyrans etc.The Yellow light emitting material also can be material 3 (5,6,7,8-tetrafluoro quinoxaline) and other more stable materials of describing among the present invention.
Adopt blue light, green glow, gold-tinted and the orange light OLED device architecture of the present invention's preparation to be exemplified below:
1. glass/ITO/ hole transmission layer/luminescent layer/electron transfer layer/cathode layer
2. glass/ITO/ hole transmission layer/luminescent layer/cathode layer
3. glass/ITO/ hole transmission layer/blue light-emitting layer/hole blocking layer/yellow or green light emitting layer/electron transfer layer/cathode layer
4. glass/conducting polymer/hole transmission layer/luminescent layer/electron transfer layer/cathode layer
5. glass/conducting polymer/hole transmission layer/luminescent layer/cathode layer
6. glass/conducting polymer/hole transmission layer/blue light-emitting layer/hole blocking layer/yellow or green light emitting layer/electron transfer layer/cathode layer
7. flexible polymer substrate glass/ITO/ hole transmission layer/luminescent layer/electron transfer layer/cathode layer
8. flexible polymer substrate glass/ITO/ hole transmission layer/luminescent layer/cathode layer
9. flexible polymer substrate glass/ITO/ hole transmission layer/blue light-emitting layer/hole blocking layer/yellow or green light emitting layer/electron transfer layer/cathode layer
Below be specific embodiments of the invention:
As shown in Figure 2, the organic function layer 3 in the structure of device comprises hole transmission layer 31, luminescent layer 32 and electron transfer layer 33.
The hole transport layer material of device is NPB, and Yellow luminous layer material is a material 3, and electron transport material is Alq
3, cathode layer Mg:Ag alloy.The entire device structrual description is:
Glass substrate/ITO/NPB (20nm)/material 3 (10nm)/Alq
3(30nm)/Mg:Ag (100nm)
The preparation method is as follows:
1. utilize washing agent, ethanolic solution and deionized water that the transparent conduction base sheet ito glass is carried out ultrasonic cleaning, clean the back and dry up with drying nitrogen.Wherein the ITO film above the glass substrate is as the anode layer of device, and the square resistance of ITO film is 10 Ω/, and thickness is 180nm.
2. with dried substrate in vacuum chamber, be under the oxygen pressure ring border of 20Pa ito glass to be carried out low energy oxygen plasma preliminary treatment 10 minutes at air pressure, sputtering power is～20W.
3. the substrate after will handling begins to carry out the evaporation of organic film in the vaporization chamber of condition of high vacuum degree.According to the device architecture as mentioned above blue-light-emitting layer material NPB of evaporation successively is 15nm, 3 layers of 5nm of Yellow luminous layer material, electron transport material Alq
3Layer 15nm.The evaporation speed 0.1nm/s of each organic layer, evaporation speed and thickness are by near the film thickness gauge monitoring that is installed in the substrate.
4. finish the preparation of laggard row metal electrode at the organic layer evaporation.Its air pressure is 3 * 10
-3Pa, evaporation speed is～1nm/s, Mg in the alloy, the Ag ratio is～10:1 that thicknesses of layers is 100nm.Evaporation speed and thickness are by near the film thickness gauge monitoring that is installed in the substrate.
5. ready-made device is encapsulated at the gloves raising middle flask, glove box is 99.9% nitrogen atmosphere.
6. electric current-the voltage of test component-light characteristic, the luminescent spectrum parameter of test component simultaneously.
As shown in Figure 2, the organic function layer 3 in the structure of device comprises hole transmission layer 31, luminescent layer 32 and electron transfer layer 33.
The hole transport layer material of device is PVK, and Yellow luminous layer material is a material 3,, electron transport material is Alq
3, cathode layer Mg:Ag alloy.The entire device structrual description is:
Glass substrate/ITO/PVK (15nm)/material 3 (10nm)/Alq
3(30nm)/Mg:Ag (100nm)
The preparation of devices method is as follows:
1. utilize washing agent, ethanolic solution and deionized water that transparent substrates is carried out ultrasonic cleaning, clean the back and dry up with drying nitrogen;
2. transparent substrates is carried out the preparation of electrode in the vacuum evaporation chamber, described electrode comprises anode layer or cathode layer;
3. the transparent substrates that will prepare electrode is in vacuum chamber, under oxygen pressure ring border to carrying out the preliminary treatment of low energy oxygen plasma;
4. the transparent substrates after will handling is carried out the spin coating of organic film in spin coater, according to device architecture spin coating organic function layer successively, described organic function layer comprise luminescent layer, carrier blocking layers and (or) implanted layer and resilient coating;
5. finish to carry out in the vaporization chamber of back at condition of high vacuum degree the preparation of another electrode in the organic layer spin coating, described electrode comprises cathode layer or anode layer;
6. ready-made device is encapsulated in glove box, glove box is a nitrogen atmosphere;
7. electric current-the voltage of test component-light characteristic, the luminescent spectrum parameter of test component simultaneously.
Embodiment 3
As shown in Figure 2, the organic function layer 3 in the structure of device comprises hole transmission layer 31, luminescent layer 32 and electron transfer layer 33.
The hole transport layer material of device is NPB, and green emitting layer material 2, electron transport material are Alq
3, cathode layer Mg:Ag alloy.The entire device structrual description is:
Glass substrate/ITO/NPB (15nm)/material 2 (10nm)/Alq
3(30nm)/Mg:Ag (100nm)
The preparation of devices flow process is similar to embodiment 1.
As shown in Figure 3, the organic function layer 3 in the structure of device comprises hole transmission layer 31, luminescent layer 32.
The hole transport layer material of device is PVK, Yellow luminous layer material 3, cathode layer Mg:Ag alloy.The entire device structrual description is:
Glass substrate/ITO/PVK (30nm)/material 3 (20nm)/Mg:Ag (100nm)
The preparation of devices flow process is similar to embodiment 2.
As shown in Figure 3, the organic function layer 3 in the structure of device comprises hole transmission layer 31, luminescent layer 32.
The hole transport layer material of device is m-TDATA, Yellow luminous layer material 3, cathode layer Mg:Ag alloy.The entire device structrual description is:
Glass substrate/ITO/m-TDATA (30nm)/material 3 (20nm)/Mg:Ag (100nm)
The preparation of devices flow process is similar to embodiment 1.
Embodiment 6
As shown in Figure 3, the organic function layer 3 in the structure of device comprises hole transmission layer 31, luminescent layer 32.
The hole transport layer material of device is TPD, Yellow luminous layer material 3, cathode layer Mg:Ag alloy.The entire device structrual description is:
Glass substrate/ITO/TPD (30nm)/material 3 (20nm)/Mg:Ag (100nm)
The preparation of devices flow process is similar to embodiment 1.
Embodiment 7
As shown in Figure 4, the organic function layer 3 in the structure of device comprises hole transmission layer 31, blue light-emitting layer 321, hole blocking layer 34, Yellow luminous layer 322, electron transfer layer 33.
The hole transport layer material of the device blue-light-emitting layer material of holding concurrently is NPB, and hole mobile material is BCP, and Yellow luminous system is a material 3, cathode layer Mg:Ag alloy.The entire device structrual description is:
Glass substrate/ITO/NPB (30nm)/BCP (6nm)/material 3 (10nm)/Alq
3(30nm)/Mg:Ag (100nm)
The preparation of devices flow process is similar to embodiment 1.
Embodiment 8
As shown in Figure 5, the organic function layer 3 in the structure of device comprises hole transmission layer 31, blue light-emitting layer 321, Yellow luminous layer 322.
The hole transport layer material of device is m-TDATA, blue-light-emitting layer material 1, and Yellow luminous system is Alq
3: Rubrene mixes, cathode layer Mg:Ag alloy.The entire device structrual description is:
Glass substrate/ITO/m-TDATA (30nm)/material 4 (20nm)/Alq
3: DCM) (20nm)/Mg:Ag (100nm)
The preparation of devices flow process is similar to embodiment 1.
The luminescent spectrum that device presses down in the 10V forward drive is referring to accompanying drawing 6.
Claims (2)
1, a kind of organic electroluminescence device of stable performance, comprise transparent substrates, anode layer and cathode layer, wherein anode layer or cathode layer are positioned at the transparent substrates surface, also comprise the organic function layer that is arranged between described anode layer and the cathode layer, which comprises at least luminescent layer, this luminescent layer is luminous under the driving of additional power source, and described luminescent layer is the fluorescent material layer that sends blue light, green glow, gold-tinted or orange light, under the driving of described additional power source, send corresponding monochromatic light; Perhaps luminescent layer is made of jointly fluorescent material layer that sends blue light and the fluorescent material layer that sends gold-tinted or green glow, under the driving of described additional power source, sends white light or cyan light, it is characterized in that described fluorescent material layer has following structural framework:
Wherein, R is an alkyl substituent, and expression formula is C
nH
2n+1, n=1,2,3,4.......
2, the organic electroluminescence device of stable performance according to claim 1, it is characterized in that, the functional group with electron-withdrawing power of conjugated structure is aromatic radical or heterocyclic substituent and the electron withdraw group introduced thereon, and the molecular configuration of fluorescent material that contains the functional group with electron-withdrawing power of conjugated structure in the structure comprises (1)～(18):
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