CN101394696A - Organic EL device - Google Patents
Organic EL device Download PDFInfo
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- CN101394696A CN101394696A CNA2007101220403A CN200710122040A CN101394696A CN 101394696 A CN101394696 A CN 101394696A CN A2007101220403 A CNA2007101220403 A CN A2007101220403A CN 200710122040 A CN200710122040 A CN 200710122040A CN 101394696 A CN101394696 A CN 101394696A
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Abstract
The invention relates to an organic electroluminescent device which basically generates white light. The organic electroluminescent device basically generates white light, and comprises a base plate, an anode, a cathode and an organic function layer arranged between the anode and the cathode. The device is characterized in that the organic function layer also comprises a blue light transition layer which is adjacent to a blue light luminescent layer and closed to one side of the anode. The blue light transition layer is formed by a main material doped a blue dyes, and the main material has the double carrier transmission property, wherein, the main material with the double carrier transmission property adopts a single main material or a double main material. The organic electroluminescent device has longer service life.
Description
Technical field
The present invention relates to organic electroluminescence device, relate in particular to the white light parts that improves luminescent lifetime.
Background technology
Advantages such as organic electroluminescence device is thin with its body, area is big, full curing, flexibility have caused people's extensive concern, and organic electroluminescent white light device also becomes the focus of people's research with its great potential at aspects such as solid-state illumination light source, liquid crystal backlights.
As far back as the fifties, people such as Bernanose.A have just begun the research of organic electroluminescence device (OLED).The material of original research is the anthracene single crystal sheet.Owing to there is the big problem of single-chip thickness, required driving voltage is very high.Deng Qingyun (C.W.Tang) and Vanslyke up to U.S. Eastman Kodak company in 1987 have reported that structure is: ITO/Diamine/Alq
3The brightness under 10 volts operating voltage of the electroluminous organic small molecular device of/Mg:Ag, device reaches 1000cd/m
2, external quantum efficiency reaches 1.0%.Electroluminescent research has caused the extensive concern of scientists, and people have seen the possibility that organic electroluminescence device is applied to show.From then on opened the prelude of organic electroluminescence device research and industrialization.
The high efficiency of organic electroluminescence device, high brightness, high color stability etc. have significance for its industrialization.In recent years, the introducing of phosphorescent coloring made triplet state and singlet exciton in the luminescent layer all be fully used in the organic electroluminescence device, and the brightness and the efficient of device are greatly increased.And the working life of device particularly the life-span of blue-light device and blue light-emitting layer is a restriction organic electroluminescence device bottleneck of performance problem, people prolong device lifetime by having developed modes such as various longer life blue light materials and optimised devices structure, improve the mode of device lifetime having mentioned by introducing two kinds of dopant dyes in application number is 200510007765.9 and 200510007786.0 Chinese patent as Sanyo aspect the structure optimization, Kodak also discloses second dopant of accepting first dopant of matrix electronics-hole energy and accepting the hole by introducing and has improved the method for device lifetime in application number is the Chinese patent of 01120883.X, the above-mentioned doping luminescent layer of mentioning, all be to mix in independent luminescent layer, its shortcoming is that the luminous efficiency of device is not high.
Technical scheme
The organic electroluminescence device that emits white light that the object of the present invention is to provide life characteristic to significantly improve.
Above-mentioned purpose of the present invention is achieved by following technical solution:
A kind of organic electroluminescence device, basically produce white light, this device comprise substrate, anode, negative electrode and be clipped in anode and negative electrode between organic function layer, it is adjacent with blue light-emitting layer to it is characterized in that described organic function layer also comprises, and the blue light transition zone of close anode one side, the material of main part doped, blue dyestuff that described blue light transition zone is the double carriers transport property forms.Wherein the material of double carriers transport property is meant the material of hole transport character and electric transmission character.
In above-mentioned organic electroluminescence device, the material of main part of double carriers transport property can be the single main body material, for example can be 4,4 '-N, N '-two carbazoles-biphenyl (being called for short CBP).
In above-mentioned organic electroluminescence device, the material of main part of double carriers transport property can be two material of main parts, one of two main bodys are the material of hole transport character, another is the material of electric transmission character, for example the material of hole transport character can be N, N '-two-(1-naphthyl)-N, N '-diphenyl-1,1 '-xenyl-4,4 '-diamines (being called for short NPB), the material of electric transmission character can be two (2-methyl-8-quinolyl) 4-benzene substituting phenol base-aluminium (being called for short BAlq), and wherein the mass percent of the material of hole transport character is 10%-40%, preferred 20%.
In above-mentioned organic electroluminescence device, the thickness of blue light transition zone is 10-30nm.
In above-mentioned organic electroluminescence device, the dopant in the blue light transition zone can be four uncle Ding Ji perylenes (being called for short TBPe).
In above-mentioned organic electroluminescence device, also comprise Yellow luminous layer in the organic function layer.
In above-mentioned organic electroluminescence device, also comprise green light emitting layer and red light emitting layer in the organic function layer.
In above-mentioned organic electroluminescence device, can also comprise in hole injection layer, hole transmission layer, electron injecting layer and the electron transfer layer one or more layers in the organic function layer.
Description of drawings
The two luminescence center white light parts structural representations of Fig. 1 the present invention
01 substrate, 02 anode, 03 negative electrode, 04 hole injection layer, 05 hole transmission layer, 06 Yellow luminous layer, 07 blue light transition zone, 08 blue light-emitting layer, 09 electron transfer layer, 10 luminescent layers
Fig. 2 the present invention three luminescence center white lights 01 substrate, 02 anode, 03 negative electrode, 04 hole injection layer, 05 hole transmission layer, 12 green light emitting layers, 13 blue light transition zones, 14 blue light-emitting layers, 15 red light emitting layers, 09 electron transfer layer, 10 luminescent layers
In Fig. 3 embodiment of the invention 1 device lifetime comparison diagram
In Fig. 4 embodiment of the invention 3 device lifetime comparison diagram
Embodiment
Basic block diagram in the organic electroluminescence device that the present invention proposes as shown in Figure 1, wherein 01 be substrate, can be glass or flexible substrate, a kind of material in flexible substrate employing polyesters, the polyimides compounds; 02 is anode layer, can adopt inorganic material or organic conductive polymer, inorganic material is generally ITO, the higher metals of work function such as metal oxide such as zinc oxide, zinc tin oxide or gold, copper, silver, preferred ITO, the organic conductive polymer is preferably a kind of material in polythiophene/polyvinylbenzenesulfonic acid sodium (hereinafter to be referred as PEDOTPSS), the polyaniline (hereinafter to be referred as PANI); 03 is cathode layer, generally adopts the alloy of the lower metal of work functions such as lithium, magnesium, calcium, strontium, aluminium, indium or they and copper, gold, silver, or the electrode layer that alternately forms of metal and metal fluoride, and the present invention is preferably LiF layer, Al layer successively.
Among Fig. 1 04 is hole injection layer HIL (nonessential), and its host material can adopt the copper phthalein mountain valley with clumps of trees and bamboo (CuPc), and the inorganic material of doping can adopt the halide of bismuth metal or the oxide of bismuth metal; 05 is hole transmission layer HTL, and its host material can adopt the low molecular material of the arylamine class and the branch polymer same clan, preferred NPB, and the inorganic material of doping can adopt the halide of bismuth metal or the oxide of bismuth metal; 10 luminescent layer EML generally adopt small molecule material, can be fluorescent materials, as metal organic complex (as Alq
3, Gaq
3, Al (Saph-q) or Ga (Saph-q)) compounds, can be doped with dyestuff in this small molecule material, doping content is the 0.01wt%～20wt% of small molecule material, dyestuff is generally a kind of material in aromatic condensed ring class (as rubrene), Coumarins (as DMQA, C545T) or two pyrans class (as DCJTB, the DCM) compound, the luminescent layer material also can adopt carbazole derivates such as CBP, polyvinylcarbazole (PVK), but Doping Phosphorus photoinitiator dye in this material is as three (2-phenylpyridine) iridium (Ir (ppy)
3), two (2-phenylpyridine) (acetylacetone,2,4-pentanedione) iridium (Ir (ppy)
2(acac)), octaethylporphyrin platinum (PtOEP) etc.; 09 is electron transfer layer, and materials used is the micromolecule electron transport material also, is generally metal organic complex (as Alq
3, Gaq
3, Al (Saph-q), BAlq or Ga (Saph-q)), aromatic condensed ring class (as pentacene, perylene) or o-phenanthroline class (as Bphen, BCP) compound.
To provide some embodiment below also in conjunction with the accompanying drawings, specific explanations technical scheme of the present invention.Should be noted that the following examples only are used for helping to understand invention, rather than limitation of the present invention.
Embodiment 1
Embodiment 1 is the white light parts of two luminescence centers, as shown in Figure 1, luminescent layer 10 comprises Yellow luminous layer 06 respectively, blue light transition zone 07 and blue light-emitting layer 08, wherein Yellow luminous layer 06 can adopt hole transport ability material of main part such as NPB, the doping weld is as 5,6,11,12-tetraphenyl aphthacene (being called for short rubrene), or 4-methylene dicyanoethyl-2-methyl-6-(p-dimethylamino styryl)-4H-pyrans (being called for short DCM) or TBRb, blue light-emitting layer adopts the material of main part of electric transmission character as two (2-methyl-8-quinolyl) 4-benzene substituting phenol base-aluminium (being called for short BAlq) or 2,9-dimethyl-4,7-diphenyl-1,10-ferrosin (being called for short BCP), doping blue light dyestuff such as TBPe or 4,4 '-two (2, the 2-diphenylethyllene)-1,1 '-biphenyl (being called for short DPVBi), the blue light transition zone adopts the material of main part of double carriers transport property, adopts two material of main part doping blue light dyestuffs in the present embodiment, and promptly one of main body is the material of electric transmission character, another is the material of hole transport character, and the preferred devices structure is as follows in the present embodiment:
ITO/NPB/NPB:rubrene/BAlq:NPB:TBPe/BAlq:TBPe/Alq
3/LiF/Al (1)
The concrete preparation method who prepares the organic electroluminescence device with above structural formula (1) is as follows:
1. utilize the ultrasonic and ultrasonic method of deionized water of the washing agent boil that glass substrate is cleaned, and be placed on infrared lamp under and dry, at evaporation one deck anode material on glass, thickness is 180nm;
2. the above-mentioned glass substrate that has anode is placed in the vacuum chamber, be evacuated to 1 * 10
-5Pa continues the evaporation hole transmission layer on above-mentioned anode tunic, evaporation one deck NPB film, and speed is 0.1nm/s, the evaporation thickness is 20nm; The evaporation that the method that adopts double source to steam is altogether again carried out Yellow luminous layer mixes, and the evaporation speed of NPB is 0.2nm/s, and the doping content of rubrene in NPB is 2wt%, and this layer evaporation thickness is 15nm.
3. evaporation blue light transition zone on Yellow luminous layer, the method that steam altogether in three sources of adopting is carried out, and the weight percent concentration of NPB and TBPe is respectively 20% and 3%, and the evaporation thickness is 10nm.
4. evaporation blue light-emitting layer on the blue light transition zone, the method that steam altogether in two sources of adopting is carried out, and the evaporation speed of BAlq is 0.2nm/s, and the doping weight percent concentration of TBPe is 3%, and the evaporation thickness is 20nm.
5. on blue light-emitting layer, continue evaporation one deck Alq
3Material is as electron transfer layer, and its evaporation speed is 0.2nm/s, and the evaporation total film thickness is 50nm;
6. last, evaporation LiF layer and Al layer are as the cathode layer of device successively on above-mentioned luminescent layer, and wherein the evaporation speed of LiF layer is 0.01～0.02nm/s, and thickness is 0.7nm, and the evaporation speed of Al layer is 2.0nm/s, and thickness is 150nm.
Comparative Examples 1
Device architecture is as follows:
ITO/NPB/NPB:rubrene/BAlq:TBPe/Alq
3/LiF/Al (2)
The concrete preparation method of organic electroluminescence device that preparation has above structure (2) is as follows: step is 1., 2., 4., 5. with 6. identical with embodiment 1, and the difference part has been to save the 3. preparation of medium blue light transition layer of step.
Comparative Examples 2
Device architecture is as follows:
ITO/NPB/NPB:rubrene/BAlq:NPB:TBPe/Alq
3/LiF/Al (3)
It is as follows that preparation has the concrete preparation method of organic electroluminescence device of above structure (3): step is 1., 2., 3., 5. with 6. identical with embodiment 1, and the difference part has been to save the preparation of the blue light-emitting layer of step in 4..
The OLED device architecture performance of top embodiment 1 and Comparative Examples 1,2 is as shown in table 1 below, and corresponding performance map is referring to Fig. 3:
Table 1
| Device | The device luminous layer structure | Device lifetime (h) | Luminous efficiency (cd/A) | Glow color |
| Embodiment 1 | NP:rubrene/BAlq:20％NPB:3％TBPe(10nm)/BAlq:3％TBPe(20nm) | 550 | 10 | In vain |
| Comparative Examples 1 | NPB:rubrene/BAlq:3％TBPe(20nm) | 320 | 10 | In vain |
| Comparative Examples 2 | NPB:rubrene/BAlq:20％NPB:3％TBPe(20nm) | 380 | 9 | White yellow partially |
By table 1 and Fig. 3 device architecture of embodiment of the invention Smalt luminescent layer and the combination of blue transition zone as can be seen, its working life compares independent blue light-emitting layer or blue transition zone has had significant raising, and the luminous efficiency of device is not affected, even is better than only comprising the device efficiency of independent blue light-emitting layer.
Embodiment 2
Device architecture is as follows:
ITO/NPB/NPB:DCM/BAlq:NPB(X％):TBPe(Ynm)/BAlq:TBPe/Alq
3/LiF/Al (4)
The concrete preparation method of organic electroluminescence device that preparation has above structure (4) is as follows:
Step is 1., 2., 4., 5. and 6. with embodiment 1, and step 3. in the preparation of blue light transition zone, carry out by the method that steam altogether in three sources of adopting, and the mass concentration of NPB and TBPe is respectively X% and 3%, and the evaporation thickness is Ynm
The blue light transition zone is that the device architecture performance data of different levels of doping and thickness is as shown in table 2 below:
Table 2
| The device architecture of blue light transition zone and blue-light-emitting layer segment | Xwt％ | Y(nm) | Device lifetime (h) | Luminous efficiency (cd/A) | Glow color |
| BAlq:NPB(20％):TBPe(3％)(10nm)/BAlq:TBPe | 20 | 10 | 800 | 8 | In vain |
| BAlq:NPB(40％):TBPe(3％)(10nm)/BAlq:TBPe | 40 | 10 | 500 | 7.5 | In vain |
| BAlq:NPB(60％):TBPe(3％)(10nm)/BAlq: |
60 | 10 | 400 | 6 | Blue partially |
| BAlq:NPB(20％):TBPe(3％)(20nm)/BAlq:TBPe | 20 | 20 | 450 | 7 | In vain |
| BAlq:NPB(40％):TBPe(3％)(20nm)/BAlq:TBPe | 40 | 20 | 400 | 6.5 | In vain |
| BAlq:NPB(60％):TBPe(3％)(20nm)/BAlq: |
60 | 20 | 350 | 5.5 | Blue partially |
Data from table 2 as can be seen, the weight percent concentration of NPB is 20% in the blue light transition zone, the weight percent concentration of TBPe is 3%, when the thickness of blue light transition zone was 10nm, device had the longest working life.
In the adjacent position of blue light-emitting layer, the blue light transition zone is set among the above embodiment, has effectively improved the working life of white light parts, think mainly based on following several reasons near anode one side:
1) expansion in electronics, hole-recombination zone improves device lifetime, and for example in the white light parts of common double luminescent layer, because the restriction of potential barrier, most charge carrier is compound to concentrate on two adjacent YH:YD/BH at the interface of luminescent layer
1: (YH represents yellow material of main part to BD, and YD represents yellow dopant dye, BH
1Represent blue material of main part, BD represents blue dopant dye), introduce the blue light transition zone among the present invention, the material of main part of the double carriers transport property in the blue light transition zone can transporting holes and electronics to the BH at the interface of blue light transition zone and blue light-emitting layer
1: BH
2: BD/BH
1: BD, the compound YH:YD/BH that lays respectively at of hole and electronics like this
2: BD and BH
1: BH
2: BD/BH
1: (YH represents yellow material of main part to BD, and YD represents yellow dopant dye, BH
1Represent the blue light material of main part of electric transmission character, BH
2Represent the material of main part of hole transport character, BD represents blue dopant dye) two interfaces, the expansion of compound interface has effectively improved the life-span of white light parts, simultaneously owing to concentration of dopant in the blue light transition zone is higher, when doping content is higher, form continuous energy level, can effectively promote the transmission of charge carrier, also-decide to have improved on the degree life-span and the efficient of device.
2) improve the hole utilance, the hole in common organic luminescent device for how son, hole mobility will be much larger than electron mobility, the NPB of hole transport property makes a large amount of holes arrive the ETL layer easily in the blue light transition zone, and the dye adulterated material of main part of adjacent list to be the blue light-emitting layer of electric transmission character can make more hole be utilized, improve device lifetime and efficient.
3) the auxiliary light emission layer is to the improvement of device lifetime, in white light parts, the longevity of blue dyes, bright relatively other colors were much shorter, made the blue light of device respectively from blue light-emitting layer and blue transition zone by introducing blue transition zone among the embodiment, therefore can improve device useful life.
4) vitrification point improves, and the introducing of two material of main parts makes blue light cross for example NPB of vitrification point is lower in the layer material more, because doping with other materials, vitrification point is improved, and thermal stability strengthens, thereby makes the thermal stability of device integral body improve.
Embodiment 3
Embodiment 3 is the white light parts of three luminescent layers, and as shown in Figure 3, luminescent layer 10 comprises green light emitting layer 12 respectively, blue light transition zone 13, blue light-emitting layer 14 and red light emitting layer 15, wherein green light emitting layer 12 can adopt hole transport ability material of main part such as NPB, doping green dyestuff such as 10-(2-[4-morpholinodithio)-1,1,7,7,-tetramethyl-2,3,6,7-tetrahydrochysene-1H, 5H, 11H-benzo [1] pyrans [6,7,8-ij] quinoline piperazine (being called for short C545T) or three (2-phenylpyridine) iridium (abbreviation Ir (ppy)
3), blue light-emitting layer adopts the material of main part of electric transmission character as two (2-methyl-8-quinolyl) 4-benzene substituting phenol base-aluminium (being called for short BAlq) or 2,9-dimethyl-4,7-diphenyl-1,10-ferrosin (being called for short BCP), doping blue light dyestuff such as TBPe or, 4 '-two (2, the 2-diphenylethyllene)-1,1 '-biphenyl (being called for short DPVBi), the blue light transition zone adopts the material of main part of double carriers transport property, adopt two material of main part doping blue light dyestuffs in the present embodiment, be the material of one of main body for electric transmission character, another is the material of hole transport character, and red light emitting layer adopts at three (oxine) aluminium (Alq
3) the middle doping red dye 4-4-dicyano methylene-2-tert-butyl group-6-(1,1,7,7-tetramethyl-julolidine-9-vinyl)-4H-pyrans (being called for short DCJTB) or Ir (piq)
2(acac), the preferred devices structure is as follows in the present embodiment:
ITO/NPB/NPB:C545T/BAlq:NPB:TBPe/BAlq:TBPe/Alq
3:Ir(piq)
2(acac)/Alq
3/LiF/Al (5)
The concrete preparation method of organic electroluminescence device that preparation has above structure (5) is as follows:
1. utilize the ultrasonic and ultrasonic method of deionized water of the washing agent boil that glass substrate is cleaned, and be placed on infrared lamp under and dry, at evaporation one deck anode material on glass, thickness is 180nm;
2. the above-mentioned glass substrate that has anode is placed in the vacuum chamber, be evacuated to 1 * 10
-5Pa continues the evaporation hole transmission layer on above-mentioned anode tunic, evaporation one deck NPB film, and speed is 0.1nm/s, the evaporation thickness is 20nm; The evaporation that the method that adopts double source to steam is altogether again carried out green light emitting layer mixes, and the doping content of C545T in NPB is 2wt%, and the evaporation thickness is 15nm.
3. evaporation blue light transition zone on green light emitting layer, the method that steam altogether in three sources of adopting is carried out, and the weight percent concentration of NPB and TBPe is respectively 20% and 3%, and the evaporation thickness is 20nm.
4. evaporation blue light-emitting layer on the blue light transition zone, the method that steam altogether in two sources of adopting is carried out, and the doping weight percent concentration of TBPe is 3%, and the evaporation thickness is 20nm.
5. on blue light-emitting layer, continue the method evaporation red light emitting layer that steam altogether in employing two sources, Ir (piq)
2(acac) doping percent concentration is 5%, and the evaporation thickness is 10nm
6. on red light emitting layer, continue evaporation one deck Alq
3Material is as electron transfer layer, and its evaporation speed is 0.2nm/s, and the evaporation total film thickness is 50nm;
7. last, evaporation LiF layer and Al layer are as the cathode layer of device successively on above-mentioned luminescent layer, and wherein the evaporation speed of LiF layer is 0.01～0.02nm/s, and thickness is 0.7nm, and the evaporation speed of Al layer is 2.0nm/s, and thickness is 150nm.
Comparative Examples 3
Device architecture is as follows:
ITO/NPB/NPB:C545T/BAlq:TBPe/Alq
3:Ir(piq)
2(acac)/Alq
3/LiF/Al (6)
The concrete preparation method of organic electroluminescence device that preparation has above structure (6) is as follows: step is 1., 2., 4., 5., 6. with 7. identical with embodiment 3, and the difference part has been to save the 3. preparation of medium blue light transition layer of step.
Comparative Examples 4
Device architecture is as follows:
ITO/NPB/NPB:C545T/BAlq:NPB:TBPe/Alq
3: Ir (piq)
2(acac)/Alq
3The concrete preparation method of organic electroluminescence device that/LiF/Al (7) preparation has above structure (7) is as follows: step is 1., 2., 3., 5., 6. with 7. identical with embodiment 3, and the difference part has been to save the preparation of the blue light-emitting layer of step in 4..
The OLED device architecture performance of top embodiment 3 and Comparative Examples 3,4 is as shown in table 3 below, and corresponding performance map is referring to Fig. 4:
Table 3
| Device | The device luminous layer structure | Device lifetime (h) | Luminous efficiency (cd/A) | Glow color |
| Embodiment 3 | NPB:C545T/BAlq:20％NPB:3％TBPe(20nm)/BAlq:3％TBPe(20nm)/Alq 3:Ir(piq) 2(acac) | 450 | 13 | In vain |
| Comparative Examples 3 | NPB:C545T/BAlq:3％TBPe(20nm)/Alq 3:Ir(piq) 2(acac) | 300 | 11 | In vain |
| Comparative Examples 4 | NPB:C545T/BAlq:20％NPB:3％TBPe(20nm)/ Alq 3:Ir(piq) 2(acac) | 350 | 15 | Red partially in vain |
By table 3 and Fig. 4 device architecture of embodiment of the invention Smalt luminescent layer and the combination of blue light transition zone as can be seen, its working life compares independent blue light-emitting layer or the blue light transition zone has had significant raising, and the luminous efficiency of device is not affected, even is better than only comprising the device efficiency of independent blue light-emitting layer.
Embodiment 4
Device architecture is as follows:
ITO/NPB/NPB:C545T/BAlq:NPB(X％):TBPe(Ynm)/BAlq:TBPe/Alq
3:Ir(piq)
2(acac)/Alq
3/LiF/Al (8)
The concrete preparation method of organic electroluminescence device that preparation has above structure (8) is as follows:
Step is 1., 2., 4., 5., 6. and 7. with embodiment 3, and step 3. in the preparation of blue light transition zone, carry out by the method that steam altogether in three sources of adopting, and the weight concentration of NPB and TBPe is respectively X% and 3%, and the total speed of evaporation is 0.1%, and the evaporation thickness is Ynm
The blue light transition zone is that the device architecture performance data of different levels of doping and thickness is as shown in table 4 below:
Table 4
| The device architecture of blue light transition zone and blue-light-emitting layer segment | X wt％ | Y(nm) | Device lifetime (h) | Luminous efficiency (cd/A) | Glow color |
| BAlq:NPB(20％):TBPe(3％)(10nm)/BAlq:TBPe | 20 | 10 | 800 | 13 | In vain |
| BAlq:NPB(40％):TBPe(3％)(10nm)/BAlq:TBPe | 40 | 10 | 600 | 14.5 | In vain |
| BAlq:NPB(60％):TBPe(3％)(10nm)/BAlq: |
60 | 10 | 500 | 13.5 | Blue partially |
| BAlq:NPB(20％):TBPe(3％)(20nm)/BAlq:TBPe | 20 | 20 | 450 | 12 | In vain |
| BAIq:NPB(40％):TBPe(3％)(20nm)/BAlq:TBPe | 40 | 20 | 400 | 13.5 | In vain |
| BAlq:NPB(60％):TBPe(3％)(20nm)/BAlq: |
60 | 20 | 350 | 12.5 | Blue partially |
Data from table 4 as can be seen, the weight percent concentration of NPB is 20% in the blue light transition zone, the weight percent concentration of TBPe is 3%, when the thickness of blue light transition zone was 10nm, device had the longest working life.
Embodiment 5
Embodiment 5 is the white light parts of two luminescent layers, luminescent layer comprises Yellow luminous layer, blue light transition zone and blue light-emitting layer, wherein the blue light transition zone is that single main body is mixed, and promptly material of main part not only has hole transport character but also have electric transmission character, is the material of main part of double carriers transport property.The preferred devices structure is as follows:
ITO/NPB/NPB:rubrene/CBP:TBPe/BAlq:TBPe/Alq
3/LiF/Al (9)
The concrete preparation method of organic electroluminescence device that preparation has above structure (9) is as follows:
Step is 1., 2., 4., 5. and 6. with embodiment 1, and step 3. in the preparation of blue light transition zone, carry out by the method that steam altogether in two sources of adopting, and the evaporation speed of CBP is 0.1nm/s, and the weight percent concentration of TBPe is 3%, and the evaporation thickness is respectively 10nm and 20nm.
The white light parts that is prepared as follows two groups of device architectures simultaneously as a comparison case, the preparation method is with embodiment 5:
ITO/NPB/NPB:rubrene/BAlq:TBPe/Alq
3/LiF/Al (10)
ITO/NPB/NPB:rubrene/CBP:TBPe/Alq
3/LiF/Al (11)
The OLED device architecture performance of top embodiment 5 and Comparative Examples is as shown in table 5 below:
Table 5
| The device luminous layer structure | Device lifetime (h) | Luminous efficiency (cd/A) | Glow color |
| NPB:rubrene/CBP:3％TBPe(10nm)/BAlq:3％TBPe(20nm) | 750 | 9 | In vain |
| NPB:rubrene/CBP:3％TBPe(20nm)/BAlq:3％TBPe(20nm) | 600 | 8.5 | In vain |
| NPB:rubrene/BAlq:3％TBPe(20nm) | 500 | 9 | In vain |
| NPB:rubrene/CBP:3％TBPe(10nm) | 450 | 7.5 | White yellow partially |
The device architecture that makes up of the blue transition zone that the single main body of double carriers transport property is mixed in the embodiment of the invention and blue light-emitting layer as can be seen from Table 5, its working life compares independent blue light-emitting layer or the blue light transition zone has also had significant raising, the luminous efficiency of device is not affected, even be better than only comprising the device efficiency of independent blue light-emitting layer, and the weight percent concentration at dopant TBPe is 3%, when the blue light transition region thickness was 10nm, the working life of device was the longest.
In addition, the dopant dye of Smalt luminescent layer of the present invention can also be selected any one among BCzVBi, BCzVB, DPAVBi, DPAVB, BDAVBi or the N-BDAVBi.
Claims (13)
1, organic electroluminescence device, basically produce white light, this device comprise substrate, anode, negative electrode and be clipped in anode and negative electrode between organic function layer, it is adjacent with blue light-emitting layer to it is characterized in that described organic function layer also comprises, and the blue light transition zone of close anode one side, the material of main part doped, blue dyestuff that described blue transition zone is the double carriers transport property forms.
2, organic electroluminescence device according to claim 1, the material of main part that it is characterized in that described double carriers transport property is the single main body material.
3, organic electroluminescence device according to claim 2 is characterized in that described single main body material is CBP.
4, organic electroluminescence device according to claim 1 is characterized in that the material of main part of described double carriers transport property is two material of main parts, and one of described pair of main body is the material of hole transport character, and another is the material of electric transmission character.
5, organic electroluminescence device according to claim 4, the mass percent that it is characterized in that the material of described hole transport character is 10%-40%.
6, organic electroluminescence device according to claim 5, the mass percent that it is characterized in that the material of described hole transport character is 20%.
7, organic electroluminescence device according to claim 4, one of two main bodys that it is characterized in that described blue light transition zone are identical with dopant with the material of main part of blue light-emitting layer with dopant.
8, organic electroluminescence device according to claim 4, the material that it is characterized in that described hole transport character is NPB, the material of described electric transmission character is BAlq.
9, according to the described organic electroluminescence device of the arbitrary claim of claim 1-8, the thickness that it is characterized in that described blue light transition zone is 10-30nm.
10,, it is characterized in that the dopant in the described blue light transition zone is TBPe according to the described organic electroluminescence device of the arbitrary claim of claim 1-8.
11, organic electroluminescence device according to claim 1 is characterized in that also comprising in the described organic function layer Yellow luminous layer.
12, organic electroluminescence device according to claim 1 is characterized in that also comprising in the described organic function layer green light emitting layer and red light emitting layer.
13, organic electroluminescence device according to claim 1 is characterized in that comprising in the described organic function layer in hole injection layer, hole transmission layer, electron injecting layer and the electron transfer layer one or more layers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101220403A CN101394696A (en) | 2007-09-20 | 2007-09-20 | Organic EL device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101220403A CN101394696A (en) | 2007-09-20 | 2007-09-20 | Organic EL device |
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| Publication Number | Publication Date |
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| CN101394696A true CN101394696A (en) | 2009-03-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101220403A Withdrawn CN101394696A (en) | 2007-09-20 | 2007-09-20 | Organic EL device |
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| CN (1) | CN101394696A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101919083B (en) * | 2007-12-11 | 2012-07-25 | 全球Oled科技有限责任公司 | White OLED with blue light-emitting layers |
| CN103730587A (en) * | 2013-12-31 | 2014-04-16 | 北京维信诺科技有限公司 | Blue light organic light-emitting device and organic light-emitting display |
| CN104993062A (en) * | 2015-05-20 | 2015-10-21 | 上海交通大学 | A method for adjusting the white light spectrum of white organic electroluminescent light-emitting diodes |
| WO2016165259A1 (en) * | 2015-04-16 | 2016-10-20 | 京东方科技集团股份有限公司 | Organic light-emitting device and manufacturing method therefor, and electronic device |
| CN113540374A (en) * | 2021-07-15 | 2021-10-22 | 京东方科技集团股份有限公司 | Light emitting device, display panel and display apparatus |
-
2007
- 2007-09-20 CN CNA2007101220403A patent/CN101394696A/en not_active Withdrawn
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101919083B (en) * | 2007-12-11 | 2012-07-25 | 全球Oled科技有限责任公司 | White OLED with blue light-emitting layers |
| US8877350B2 (en) | 2007-12-11 | 2014-11-04 | Global Oled Technology Llc | White OLED with two blue light-emitting layers |
| CN103730587A (en) * | 2013-12-31 | 2014-04-16 | 北京维信诺科技有限公司 | Blue light organic light-emitting device and organic light-emitting display |
| CN103730587B (en) * | 2013-12-31 | 2017-09-29 | 北京维信诺科技有限公司 | A kind of blue light organic emissive device and OLED |
| WO2016165259A1 (en) * | 2015-04-16 | 2016-10-20 | 京东方科技集团股份有限公司 | Organic light-emitting device and manufacturing method therefor, and electronic device |
| CN104993062A (en) * | 2015-05-20 | 2015-10-21 | 上海交通大学 | A method for adjusting the white light spectrum of white organic electroluminescent light-emitting diodes |
| CN113540374A (en) * | 2021-07-15 | 2021-10-22 | 京东方科技集团股份有限公司 | Light emitting device, display panel and display apparatus |
| CN113540374B (en) * | 2021-07-15 | 2023-01-13 | 京东方科技集团股份有限公司 | Light emitting device, display panel and display apparatus |
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