CN101459224A - White organic light emitting device - Google Patents
White organic light emitting device Download PDFInfo
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- CN101459224A CN101459224A CNA2008101908066A CN200810190806A CN101459224A CN 101459224 A CN101459224 A CN 101459224A CN A2008101908066 A CNA2008101908066 A CN A2008101908066A CN 200810190806 A CN200810190806 A CN 200810190806A CN 101459224 A CN101459224 A CN 101459224A
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- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
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- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
- H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
- H10K50/13—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light comprising stacked EL layers within one EL unit
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- H10K50/00—Organic light-emitting devices
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Abstract
A white organic light emitting device (OLED) includes an anode, a first phosphorescent layer including a first host material and a first dopant disposed on the anode, a blue fluorescence layer including a blue host material and a blue dopant disposed on the first phosphorescent layer, and a second phosphorescent layer including a second host material and a second dopant disposed on the blue fluorescence layer. In addition, a triplet energy of the blue host material of the blue fluorescence layer is greater than both of a triplet energy of the first dopant of the first phosphorescent layer and a triplet energy of the second dopant of the second phosphorescent layer.
Description
Technical field
Illustrative embodiments relates to a kind of white organic light emitting device, more specifically, relate to the white organic light emitting device that a kind of wherein triplet exciton does not have the energy transfer to diffuse to emission layer (energy transition) and therefore have excellent luminous efficiency from fluorescence emission layer.
Background technology
Organic luminescent device (OLED) is the hole wherein supplied with by anode and the electronics supplied with by a negative electrode compound and luminous luminescent device in the organic luminous layer that is formed between anode and the negative electrode.Because have the characteristic of for example excellent colorrendering quality, fast response speed, spontaneous emission, little thickness, high-contrast, wide visual angle and low-power consumption, OLED can be used in televimonitor, individual computer monitor, portable terminal, MP3 player, navigator and indoor and outdoors illumination or the signal.
White light OLED is the OLED that emits white light, and can be used as the full-color display spare of the backlight of glimmer source, LCD (LCD) or use colour filter.
Fluorescence radiation is passed through in the light emission of OLED usually, yet has showed recently by the luminous OLED emission of phosphorescence.Term used herein " phosphorescence " is meant the emission from the triplet excited state of organic molecule, and term " fluorescence " is meant the emission from the singlet excited of organic molecule.In quantum mechanics, triplet is that the resultant spin angular momentum is 1 system status; Singlet state is that the resultant spin angular momentum is 0 system status.
In order to improve the luminous efficiency of white light OLED, need to realize almost the structure of 100% internal quantum.In order to form this structure, recent research guiding is to use phosphor material as luminescent layer.In fluorescent material, about 25% the singlet state energy that occupies whole excitons is by radiation transistion, remains 75% energy and then loses because of nonradiative transition.Yet in phosphor material, triplet exciton produces radiation transistion, therefore, can realize high luminous efficiency by suitably using phosphor material.
Summary of the invention
Therefore an object of the present invention is to provide a kind of white light OLED structure of improvement.
Another object of the present invention provide a kind of have can allow triplet energies to have energy not diffuse to the white light OLED of the structure of phosphorescent layer by fluorescence coating with shifting.
According to an aspect of illustrative embodiments, white organic light emitting device (OLED) is provided with first phosphorescent layer that comprises first material of main part and first dopant, comprise blue light material of main part and blue light dopant and be arranged on the blue light fluorescence coating on first phosphorescent layer and comprise second material of main part and second dopant and be arranged on second phosphorescent layer on the blue light fluorescence coating.
The triplet energies of the blue light material of main part of blue light fluorescence coating can be greater than the triplet energies of second dopant of the triplet energies of first dopant of first phosphorescent layer and second phosphorescent layer.
First material of main part of first phosphorescent layer can have the hole transport performance.Second material of main part of second phosphorescent layer can have electronic transmission performance.
White light OLED can further comprise first functional layer, first functional layer is arranged between the blue light fluorescence coating and first phosphorescent layer, and the band-gap energy of first functional layer is greater than the band-gap energy of the blue light dopant of blue light fluorescence coating, and the triplet energy level of first functional layer be equal to or less than the blue light fluorescence coating the blue light material of main part triplet energy level and be equal to or higher than the triplet energy level of first dopant of first phosphorescent layer.
White light OLED can further comprise second functional layer, second functional layer is formed between the blue light fluorescence coating and second phosphorescent layer, and the band-gap energy of second functional layer is greater than the band-gap energy of the blue light dopant of blue light fluorescence coating, and the triplet energy level of second functional layer be equal to or less than the blue light fluorescence coating the blue light material of main part triplet energy level and be equal to or higher than the triplet energy level of second dopant of second phosphorescent layer.
Second functional layer can have highest occupied molecular orbital (HOMO) energy level of 5.5eV to 7.0eV and lowest unoccupied molecular orbital (LUMO) energy level of 2.5eV to 3.5eV.
First and second functional layers can have the broad-band gap in the scope of luminescent spectrum of the blue light dopant on not absorbing the blue light fluorescence coating.
First functional layer can have the HOMO energy level of 5.2eV to 6.2eV and the lumo energy of 2.0eV to 3.0eV.Second functional layer can have the HOMO energy level of 5.5eV to 7.0eV and the lumo energy of 2.5eV to 3.5eV.
Description of drawings
This patent or application documents comprise at least one figure that represents with colour.Have this patent of coloured picture or public announcement of a patent application copy will file a request and pay necessary fee after provide by our unit.
When considered in conjunction with the accompanying drawings, by the following detailed description of reference, the present invention will become better understood, and therefore more complete understanding of the present invention and many attendant advantages of the present invention will become distinct, in the accompanying drawings, identical Reference numeral is represented same or analogous parts, wherein:
Fig. 1 is the schematic cross section of principles of construction according to the present invention as the OLED of first illustrative embodiments;
Fig. 2 is the schematic cross section of principles of construction according to the present invention as the OLED of second illustrative embodiments;
Fig. 3 shows existing white light OLED with fluorescence coating-fluorescence coating-phosphorescent layer (FFP) structure and principles of construction according to the present invention figure as the luminescent spectrum of the white light OLED with phosphorescent layer-fluorescence coating-phosphorescent layer (PFP) structure of illustrative embodiments;
Fig. 4 shows the figure of principles of construction according to the present invention as the luminescent spectrum of white light OLED (PFP structure) under different brightness of an execution mode of illustrative embodiments;
Fig. 5 is the figure that shows CIE 1931 color space chromatic diagrams.
Embodiment
Describe illustrative embodiments more fully referring now to accompanying drawing, showed illustrative embodiments of the present invention in the accompanying drawings.Yet the present invention can be presented as many different forms, is confined to execution mode given here and should not be construed as; On the contrary, provide these execution modes, and thought of the present invention is conveyed to those skilled in the art all sidedly so that the disclosure content is comprehensively with complete.Identical Reference numeral is represented components identical.
Should be appreciated that when an element be called as " " another element " on " time, can directly can there be intermediary element in it on described another element or between them.On the contrary, when an element be called as " directly existing " another element " on " time, then do not have the intermediate layer.Employed here term " and/or " comprise one or more any and all combinations in the relevant Listed Items.
Although should be appreciated that term first, second, third and other counting can be used on describes various elements, component, zone, layer and/or parts herein, these elements, component, zone, layer and/or parts should not be subjected to the restriction of these terms.These terms only are used for element, component, zone, layer and/or parts and another element, component, zone, layer and/or parts are made a distinction.Therefore, under the situation of the instruction that does not break away from illustrative embodiments, first element, component, zone, layer or the parts discussed below can be called second element, component, zone, layer or parts.
Term as used herein just is used to describe specific implementations, but not intention restriction the present invention.The employed singulative of this paper " one (kind) (a, an) " and " being somebody's turn to do " also are intended to comprise plural form, unless context clearly indicates in addition.Also should further understand, when term " comprise " or " comprising " with in this manual the time, it shows and has described feature, zone, integral body (integer), step, operation, element and/or component, does not exist or increases one or more further features, zone, integral body, step, operation, element, component and/or their combination but do not get rid of.
For convenience of description, but usage space relative terms in this article, for example " ... under ", " ... following ", " bottom ", " in ... top ", " top " waits element describing as shown in FIG. or feature and the other one or more elements or the relation of feature.Should be understood that except that the orientation shown in the figure space relative terms also is intended to be included in the different azimuth of the device in use or the work.For example, if the device among figure upset, be described as " " element of other element or feature " below " or " under " with orientation " " other element or feature " top ".Therefore, exemplary term " ... following " can be included in ... top (above) and in ... following (below) two kinds of orientation.Device can be otherwise directed (revolve turn 90 degrees or on other orientation), and relevant descriptor carries out respective explanations to it on the space used herein.
Unless otherwise defined, the implication of employed in this article all terms (comprising technology and scientific terminology) is identical with the implication of those skilled in the art's common sense.Will also be understood that, term, those that in common dictionary, define for example, it is consistent with their implications in association area background and present disclosure to be interpreted as its implication, unless and clearly so definition in this article, otherwise described term will not make an explanation with meaning idealized or excessively form.
Here describe illustrative embodiments with reference to cross-sectional view, cross-sectional view is the schematic diagram of each idealized execution mode of illustrative embodiments.Thereby expection has because for example variation of the shape shown that causes of manufacturing technology and/or tolerance.Therefore, each execution mode of illustrative embodiments should not be construed as the given shape that is confined to the illustrated zone of this paper, but comprises owing to for example make the deviation in shape that causes.For example, illustrate or be described as smooth zone and may have coarse and/or nonlinear characteristic usually.In addition, illustrated sharp-pointed angle may be round.Therefore, the zone shown in the figure is that schematically their shape is not to want the accurate shape of declare area in itself, also is not the scope of intention restriction illustrative embodiments.
Fig. 1 is the schematic cross section of principles of construction according to the present invention as the OLED of first illustrative embodiments.Referring to Fig. 1, the OLED of first illustrative embodiments has wherein first phosphorescent layer 151, blue light fluorescence coating 153, second phosphorescent layer 155 and negative electrode 190 structure of sequence stack on anode 110 successively.Anode 110 can be formed on the dielectric base (not shown), for example on substrate of glass or the plastic-substrates.
First phosphorescent layer 151, blue light fluorescence coating 153 and second phosphorescent layer 155 can be formed on the anode 110 successively in proper order.The material of main part of blue light fluorescence coating 153 has than the bigger triplet energies of dopant in first phosphorescent layer 151 and second phosphorescent layer 155.In quantum mechanics, triplet is that the resultant spin angular momentum is 1 system status; Singlet state is that the resultant spin angular momentum is 0 system status.Triplet energies is to be in the maximum system energy of triplet and to be in poor between the maximum system energy of singlet state.Except comprising the material of main part with high triplet energies, blue light fluorescence coating 153 also comprises the blue-light fluorescent material as dopant.Here, the material of main part of blue light fluorescence coating 153 can be any material that is used for OLED, for example, 9,10-two-(2-naphthyl) anthracene (AND), tert-butyl group AND (TBADN), carbazole biphenyl (CBP), 4,4 ', 4 ＂-three-(carbazole-9-yl)-triphenylamine (TCTA) or three-oxine aluminium complex (Alq
3).In addition, the blue light fluorescent dopants is not particularly limited, and 4,4 '-two [2-{4-(N, the N-diphenyl amino) phenyl } vinyl] biphenyl (DPAVBi), DPAVBi derivative, diphenylethyllene arlydene (distyrylarylene, DSA), DSA derivative, diphenylethyllene benzene (DSB), DSB derivative, spiral shell-DPVBi, bibenzene tetracarboxylic (biphenyltetracarboxylic acid, BPTA), BPTA derivative or spiral shell-6P can be used as the blue light fluorescent dopants.
First phosphorescent layer 151 can have the material of main part identical with the material of main part of blue light fluorescence coating 153 with second phosphorescent layer 155.Dopant in first phosphorescent layer 151 and second phosphorescent layer 155 is a phosphor material, and can have the low triplet energies of material of main part of BELAND optical fluorescence 153.On the other hand, first and second phosphorescent layer 151 and 155 material of main part can have hole transport characteristic and electron transport property respectively, so that the maximization of the exciton quantity of blue light fluorescence coating 153.To being not particularly limited as the phosphor material of the dopant in first and second phosphorescent layer 151 and 155.For example, 3-(2 '-benzothiazolyl)-7-diethyl amino coumarin (being called coumarin 6 or C6) or 10-(2-[4-morpholinodithio base)-1,1,7,7-tetramethyl-2,3,6,7-tetrahydrochysene-1H, 5H, 11H-[1] chromene [6,7,8-ij] quinolizine-11-ketone (being called cumarin 545T or C545T) or Ir (PPy) 3 (PPy=2-phenylpyridine) can be used as the green glow dopant; And [4-(dicyano the methylene)-2-tert-butyl group-6-(1,1,7,7-tetramethyl julolidine groups (julolidyl)-9-thiazolinyl)-4H-pyrans (4-(dicyano the methylene)-2-tert-butyl group-6-(1,1,7,7-tetramethyl julolidine groups-9-thiazolinyl)-the 4H-pyrans; DCJTB)], have 6% 2,3,7,8,12,13,17,18-octaethyl-21H, Alq, the RD61 of 23H-porphyrin-platinum (PtOEP) and RD15 (can from UDC Corp. obtain) or TER021 (can obtain from Merck Corp) can be used as the ruddiness dopant.
The triplet exciton that produces in the main body of blue light fluorescence coating 153 spreads to two side directions, to produce radiation transistion or compound in the phosphorescent dopants of first phosphorescent layer 151 and second phosphorescent layer 155.Therefore, if first and second phosphorescent layer 151 and 155 comprise above-mentioned ruddiness or green glow dopant, then can obtain to have the white light OLED of high-luminous-efficiency.
Between the anode 110 and first phosphorescent layer 151, can further form hole transmission layer (not shown) or electronic barrier layer (not shown).In addition, between the negative electrode 190 and second phosphorescent layer 155, can further form electron transfer layer (not shown) or hole blocking layer (not shown).
Fig. 2 is the schematic cross section of principles of construction according to the present invention as the OLED of second illustrative embodiments.Hereinafter, the element that description is different from the element of first illustrative embodiments.
Referring to Fig. 2, the OLED of second illustrative embodiments have wherein first phosphorescent layer 251, first functional layer 252, blue light fluorescence coating 253, second functional layer 254, second phosphorescent layer 255 and negative electrode 290 successively sequence stack on anode 210.Here, anode 210, first phosphorescent layer 251, blue light fluorescence coating 253, second phosphorescent layer 255 and negative electrode 290 anode 110, first phosphorescent layer 151, blue light fluorescence coating 153, second phosphorescent layer 155 with first illustrative embodiments respectively are identical with negative electrode 190, therefore no longer provide their detailed description at this.
In second illustrative embodiments, first functional layer 252 can be formed between first phosphorescent layer 251 and the blue light fluorescence coating 253, and first functional layer 252 can prevent
Energy shifts (energytransfer) (hereinafter being called energy shifts) and does not interfere the diffusion of triplet exciton between each luminescent layer.The body chromophore of giving that is in its excitation state can transfer its energy to closely adjacent (acceptor chromophore usually＜10nm) by non-radiative, long-range dipole-dipole coupling mechanism.This energy metastasis is called
Resonance energy shifts.
Here, the band-gap energy of first functional layer 252 is greater than the band-gap energy of the dopant in the blue light fluorescence coating 253, and the triplet energies of first functional layer 252 be equal to or less than blue light fluorescence coating 253 main body triplet energies and be equal to or higher than the triplet energies of the dopant in first phosphorescent layer 251.First functional layer 252 can be made by existing hole mobile material, described hole mobile material for example, have amino substituting group De oxadiazole compound, have amino substituent triphenyl methane compound, three grades of compounds, hydrazone compound, pyrazoline compounds, enamine compound, compound of styryl, 1,2-diphenyl ethene compounds or carbazole compound.First functional layer 252 can have highest occupied molecular orbital (HOMO) energy level of 5.2eV to 6.2eV and lowest unoccupied molecular orbital (LUMO) energy level of 2.0eV to 3.0eV.
In addition, second functional layer 254 can be formed between the blue light fluorescence coating 253 and second phosphorescent layer 255, and second functional layer 254 can prevent the energy transfer and not interfere the diffusion of triplet exciton between the blue light fluorescence coating 253 and second phosphorescent layer 255.Here, the band-gap energy of second functional layer 254 is greater than the band-gap energy of the dopant in the blue light fluorescence coating 253, and the triplet energies of second functional layer 254 be equal to or less than blue light fluorescence coating 253 main body triplet energies and be equal to or higher than the triplet energies of the dopant in second phosphorescent layer 255.
Second functional layer 254 can be made by existing electron transport material, described electron transport material for example, anthracene compound, phenanthrene compound, pyrene compound, perylene compound,
Compound, benzo (9,10) phenanthrene compound, fluoranthene compound, periflanthene compound, pyrroles (azole) compound, diazole (diazole) compound or vinylidene compound.Simultaneously, second functional layer 254 can have the HOMO energy level of 5.5eV to 7.0eV and the lumo energy of 2.5eV to 3.5eV.
First and second functional layers 252 and 254 are not interfered the diffusion of triplet exciton, prevent that simultaneously the energy between each luminescent layer from shifting, meanwhile, with electronics and hole confinement in blue light fluorescence coating 253 so that the charge balance maximization.
Below table 1 shown existing white light OLED (fluorescence coating-fluorescence coating-phosphorescent layer made from the performance of the white light OLED of testing second illustrative embodiments, FFP) with according to white light OLED (phosphorescent layer-fluorescence coating-phosphorescent layer, the comparison between structure and material PFP) of second illustrative embodiments.
Table 1
Existing white light OLED has the FFP structure, and the white light OLED of second illustrative embodiments has the PFP structure.In the manufacturing of existing white light OLED, functional layer is inserted in into the ruddiness layer of phosphorescent layer with between the blu-ray layer of fluorescence coating; And the blu-ray layer and the green glow layer that are fluorescence coating contact with each other.Simultaneously, in the manufacturing of the white light OLED of second illustrative embodiments, for the ruddiness layer of phosphorescent layer and green glow layer are separately positioned on both sides into the blu-ray layer of fluorescence coating, and first and second functional layers are inserted in respectively between blu-ray layer and ruddiness layer and blu-ray layer and the green glow layer.
Two white light OLEDs described in table 2 display list 1 are at 4,000 nits (every square metre of (cd/m of 1 candela
2The experimental result of the characteristics of luminescence)=1 nit).
Table 2
Fig. 5 has shown CIE 1931 color space chromatic diagrams.System of Commission Internationale De L'Eclairage (CIE) is used for characterizing color by the double-colored luminance parameter Y that specifies certain point on CIE 1931 color space chromatic diagrams and two coordinate x and y.CIE 1931 color spaces are color spaces that define on mathematics first of being created in 1931 by Commission Internationale De L'Eclairage (CIE).
According to last table 2, Commission Internationale De L'Eclairage (CIE) coordinate of existing white light OLED (FFP) is (0.33,0.33), and the CIE coordinate of the white light OLED of second illustrative embodiments (PFP) is (0.32,0.35); Therefore, the white light OLED (PFP) of the existing white light OLED (FFP) and second illustrative embodiments all has white-light spectrum.Here, the white light OLED of second illustrative embodiments (PFP) demonstrates high luminous efficiency, and change color is little.Particularly, the luminous efficiency of existing white light OLED (FFP) is 16 candela/peaces (cd/A); Yet the luminous efficiency of the white light OLED of second illustrative embodiments (PFP) significantly improves to 20 (cd/A).In addition, the external quantum efficiency of existing white light OLED (FFP) is that the external quantum efficiency of the white light OLED (PFP) of 9%, the second illustrative embodiments is 11%.And the power efficiency of existing white light OLED (FFP) is 5.05 lumens/watt (lm/w), and the power efficiency of the white light OLED of second illustrative embodiments (PFP) significantly improves to 6.1lm/w.
Fig. 3 has shown the luminescent spectrum of the white light OLED (PFP) of the existing white light OLED (FFP) and second illustrative embodiments.Referring to Fig. 3, the white light OLED of second illustrative embodiments (PFP) demonstrates peak value at green wavelength district (about 510nm), and has the green emission stronger than existing white light OLED.Therefore, in the white light OLED (PFP) of second illustrative embodiments, the triplet exciton of blue light main body is diffused in the green glow dopant, thereby the white light OLED of second illustrative embodiments (PFP) has excellent luminous efficiency.
The luminescent spectrum of white light OLED (PFP) under different brightness of second illustrative embodiments described in Fig. 4 display list 1.Referring to Fig. 4, the spectrum change that causes because of the brightness variation is little.This character is essential for display device, therefore, distributes even also can stably keep exciton when electric field change.
Although with reference to the concrete disclosure and description of its illustrative embodiments some illustrative embodiments, but it will be understood by those skilled in the art that, under the prerequisite that does not break away from as the spirit and scope of the defined illustrative embodiments of appended claims, can make various changes in form and details.
Claims (13)
1, a kind of white organic light emitting device (OLED) comprising:
First phosphorescent layer that comprises first material of main part and first dopant;
Comprise blue light material of main part and blue light dopant and be arranged on blue light fluorescence coating on described first phosphorescent layer; And
Comprise second material of main part and second dopant and be arranged on second phosphorescent layer on the described blue light fluorescence coating, the triplet energies of the blue light material of main part of wherein said blue light fluorescence coating is greater than the triplet energies of second dopant of the triplet energies of first dopant of described first phosphorescent layer and described second phosphorescent layer.
2, the white light OLED of claim 1, first material of main part of wherein said first phosphorescent layer has the hole transport performance.
3, the white light OLED of claim 1, second material of main part of wherein said second phosphorescent layer has electronic transmission performance.
4, the white light OLED of claim 1, also comprise first functional layer, described first functional layer is arranged between described blue light fluorescence coating and described first phosphorescent layer, its band-gap energy is greater than the band-gap energy of the blue light dopant of described blue light fluorescence coating, and its triplet energies be equal to or less than described blue light fluorescence coating the blue light material of main part triplet energies and be equal to or higher than the triplet energies of first dopant of described first phosphorescent layer.
5, the white light OLED of claim 4, wherein said first functional layer have highest occupied molecular orbital (HOMO) energy level of about 5.2eV to 6.2eV and lowest unoccupied molecular orbital (LUMO) energy level of about 2.0eV to 3.0eV.
6, the white light OLED of claim 1, also comprise second functional layer, described second functional layer is formed between described blue light fluorescence coating and described second phosphorescent layer, its band-gap energy is greater than the band-gap energy of the blue light dopant of described blue light fluorescence coating, and its triplet energies be equal to or less than described blue light fluorescence coating the blue light material of main part triplet energies and be equal to or higher than the triplet energies of second dopant of described second phosphorescent layer.
7, the white light OLED of claim 6, wherein said second functional layer have highest occupied molecular orbital (HOMO) energy level of about 5.5eV to 7.0eV and lowest unoccupied molecular orbital (LUMO) energy level of about 2.5eV to 3.5eV.
8, the white light OLED of claim 7, the HOMO energy level of wherein said second functional layer is equal to or higher than the HOMO energy level of described blue light fluorescence coating, first phosphorescent layer and second phosphorescent layer.
9, the white light OLED of claim 6, the HOMO energy level of wherein said second functional layer is equal to or higher than the HOMO energy level of described blue light fluorescence coating, first phosphorescent layer and second phosphorescent layer.
10, the white light OLED of claim 1 also comprises:
First functional layer, it is arranged between described blue light fluorescence coating and described first phosphorescent layer, its band-gap energy is greater than the band-gap energy of the blue light dopant of described blue light fluorescence coating, and its triplet energy level be equal to or less than described blue light fluorescence coating the blue light material of main part triplet energy level and be equal to or higher than the triplet energy level of first dopant of described first phosphorescent layer; And
Second functional layer, it is arranged between described blue light fluorescence coating and described second phosphorescent layer, its band-gap energy is greater than the band-gap energy of the blue light dopant of described blue light fluorescence coating, and its triplet energy level be equal to or less than described blue light fluorescence coating the blue light material of main part triplet energy level and be equal to or higher than the triplet energy level of second dopant of described second phosphorescent layer
Wherein said first and second functional layers have the band gap of the luminescent spectrum of the blue light dopant that does not absorb described blue light fluorescence coating.
11, the white light OLED of claim 10, wherein said first functional layer have highest occupied molecular orbital (HOMO) energy level of about 5.2eV to 6.2eV and lowest unoccupied molecular orbital (LUMO) energy level of about 2.0eV to 3.0eV.
12, the white light OLED of claim 11, wherein said second functional layer have highest occupied molecular orbital (HOMO) energy level of about 5.5eV to 7.0eV and lowest unoccupied molecular orbital (LUMO) energy level of about 2.5eV to 3.5eV.
13, the white light OLED of claim 10, wherein said second functional layer have highest occupied molecular orbital (HOMO) energy level of about 5.5eV to 7.0eV and lowest unoccupied molecular orbital (LUMO) energy level of about 2.5eV to 3.5eV.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102376900A (en) * | 2010-08-05 | 2012-03-14 | 国立清华大学 | Manufacture method of organic light-emitting diode |
| CN102484923A (en) * | 2009-09-04 | 2012-05-30 | 株式会社半导体能源研究所 | Light-emitting element, light-emitting device, and method for manufacturing the same |
| CN102668157A (en) * | 2009-11-27 | 2012-09-12 | 夏普株式会社 | Organic electroluminescence element, manufacturing method thereof, and organic electroluminescence display device |
| CN102683597A (en) * | 2011-03-09 | 2012-09-19 | 海洋王照明科技股份有限公司 | White light electroluminescent device and preparation method thereof |
| CN103280535A (en) * | 2013-06-08 | 2013-09-04 | 广州创维平面显示科技有限公司 | White light organic electroluminescence device |
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-
2008
- 2008-05-19 KR KR1020080046292A patent/KR20090036504A/en not_active Application Discontinuation
- 2008-10-09 CN CNA2008101908066A patent/CN101459224A/en active Pending
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