CN1655657A - Organic electroluminescent element - Google Patents
Organic electroluminescent element Download PDFInfo
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- CN1655657A CN1655657A CN 200510062836 CN200510062836A CN1655657A CN 1655657 A CN1655657 A CN 1655657A CN 200510062836 CN200510062836 CN 200510062836 CN 200510062836 A CN200510062836 A CN 200510062836A CN 1655657 A CN1655657 A CN 1655657A
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Abstract
This invention relates to an organic electroluminescent element, which comprises a base plate, an anode, a cathode, hole conduction inlay, an electronic conduction inlay, and at least two luminescent layers, wherein, the anode and the cathode are installed on the base plate correspondingly; the hole conduction inlay is located between the anode and the cathode; the electronic conduction inlay is set between the cathode and the hole conduction inlays; the two luminescent layers are located between the hole conduction inlay and the electronic conduction inlay, wherein, one of the layers is a fluorescent luminescent layer and the other is a phosphorescent luminescent layer and the two layers do not absorb and influence the visible spectrum transmitted by them.
Description
Technical field
The present invention relates to a kind of organic electroluminescent element (organic electroluminescent device, OELD), particularly relate to a kind of organic electroluminescent element that can send visible phosphorescence (phosphorescence) and visible fluorescence (fluorescence) simultaneously.
Background technology
Traditional organic electroluminescent element (organic electroluminescent device, OELD) be a multilayer stack architecture, and comprising a substrate, an anode, a negative electrode, a hole injection layer, a hole transmission layer, an electron transfer layer, an electron injecting layer and a luminescent layer, anode, hole injection layer, hole transmission layer, luminescent layer, electron transfer layer, electron injecting layer and negative electrode are arranged on the substrate in regular turn from bottom to top.Wherein, luminescent layer comprises host and guest's doped system, and a spot of guest emitter promptly mixes in the host emitter of volume.As for how defining this host and guest's doped system is that fluorescence (fluorescence) host and guest's doped system or phosphorescence (phosphorescence) host and guest doped system will be described as follows:
When negative electrode and anode are applied in a voltage, electronics will be by negative electrode to inject luminescent layer by the mode of electron injecting layer and electron transfer layer, the hole will be by anode to inject luminescent layer by the mode of hole injection layer and hole transmission layer, and electronics and hole can cause host emitter to be energized into excite state by ground state after the combination in luminescent layer.Owing to be in the host emitter instability of excite state, so host emitter must turn back to ground state by excite state, and with energy delivery to guest emitter.
When being energized into excite state when the guest emitter received energy and by ground state, guest emitter will produce singlet state exciton (singlet excition) and triplet exciton (triplet excition).No matter be fluorescence guest emitter or phosphorescence guest emitter, because the distributive law of electron spin attitude all can cause the formation probability of triplet exciton and singlet state exciton to be about 3: 1.
Singlet state exciton or triplet exciton will return stable ground state with the form that discharges photon, make organic electroluminescent element produce the phenomenon of electroluminescence.In fluorescence host and guest doped system, the light of being launched when having only the singlet state exciton to return ground state is visible fluorescence.Relatively, in phosphorescence host and guest doped system, the light of being launched when returning ground state except triplet exciton is visible phosphorescence, and the light of being launched when the singlet state exciton returns ground state also can see through and exchange in the system that (internal system crossing ISC) is converted to phosphorescence.
For fluorescence host and guest doped system, the exciton half life when the singlet state exciton returns ground state by excite state (exciton lifetime) is about nanosecond, and (nanosecond, ns) level will be sent visible fluorescence.
For phosphorescence host and guest doped system, the exciton half life when triplet exciton returns ground state by excite state is about nanosecond (microsecond, μ s) level, will send visible phosphorescence.In the mechanism of organic electric-excitation luminescent, because it is 3: 1 that the distributive law of electron spin attitude causes the probability of the formation of triplet exciton and singlet state exciton, adding the phosphorescence guest emitter has with the Conversion of energy of the singlet state exciton of the host emitter characteristic for the energy of self triplet exciton, so the internal quantum of phosphorescence guest emitter is about 4 times (theoretical value can arrive 100%) of fluorescence guest emitter.That is to say that organic electroluminescent element has 25% to be fluorescent emission with singlet state, and 75% is the phosphorescent emissions with triplet.And the phosphorescence guest emitter also can be further changes 25% singlet state the triplet of own body into and makes that internal quantum can be up to 100%.So the luminous efficiency of organic electroluminescent element (as phosphorescent element) that contains phosphorescence host and guest doped system is not worse than the luminous efficiency of the organic electroluminescent element that contains fluorescence host and guest doped system (as fluorescent element).
Yet the disadvantage of phosphorescence host and guest doped system is that the exciton half life is oversize.Because the half life of triplet exciton is up to μ s level, that is represents triplet exciton to rest on the singlet state exciton that time in the luminescent layer can be more general and grown about about 1,000 times.Thus, triplet exciton long time of staying in luminescent layer will cause taking place between the triplet exciton triplet exciton self-destruction phenomenon (triplet-triplet annihilation).That is to say that the triplet exciton and another triplet exciton that is in excite state that are in excite state bump against easily, the energy that the result causes two triplet excitons is with the form consume of heat or vibration, but do not discharge with the form of photon.Thus, the luminous efficiency that contains the organic electroluminescent element (as phosphorescent element) of phosphorescence host and guest doped system will present rapid downward trend along with the increase of injection current, and the luminous efficiency that influences phosphorescent element is very huge.
Summary of the invention
In view of this, purpose of the present invention be exactly provide a kind of organic electroluminescent element that can send visible phosphorescence and visible fluorescence simultaneously (organic electroluminescent device, OELD).Because the luminous efficiency of phosphorescence luminescent layer is better than the luminous efficiency of fluorescence radiation layer, makes that the luminous efficiency of organic electroluminescent element of the present invention will be also better than the organic electroluminescent element (as fluorescent element) that only contains fluorescence host and guest doped system traditionally.In addition, the concentration of phosphorescence exciton is subjected to the dilution of fluorescence exciton, will reduce the collision probability between the triplet exciton effectively, avoid taking place between the triplet exciton the suicidal phenomenon of triplet exciton, can suppress the phenomenon that decline takes place organic electroluminescent element of the present invention luminous efficiency when height operation brightness, and make the brightness of organic electroluminescent element of the present invention and luminous efficiency come well more than the brightness and the luminous efficiency of traditional phosphorescent element.
According to purpose of the present invention, a kind of organic electroluminescent element is proposed, comprise a substrate, an anode, a negative electrode, a hole transmission layer, an electron transfer layer and at least two luminescent layers.Anode and negative electrode are relatively arranged on the substrate, and hole transmission layer is arranged between anode and the negative electrode, and electron transfer layer is arranged between negative electrode and the hole transmission layer.At least two luminescent layers are arranged between hole transmission layer and the electron transfer layer, and one of them is a fluorescence radiation layer, and another is a phosphorescence luminescent layer, and fluorescence radiation layer and phosphorescence luminescent layer can not absorb and influence the visible light of sending out of the ordinary mutually.
According to a further object of the present invention, a kind of flat-panel screens is proposed, have above-mentioned organic electroluminescent element.
According to another object of the present invention, a kind of mobile display device is proposed, have above-mentioned organic electroluminescent element.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, following conjunction with figs. and preferred embodiment are to illustrate in greater detail the present invention.
Description of drawings
It is generalized section according to the organic electroluminescent element of embodiments of the invention one that Fig. 1 illustrates.
It is two generalized sections according to the organic electroluminescent element of embodiments of the invention two that Fig. 2 A～2B illustrates.
It is two generalized sections according to the organic electroluminescent element of embodiments of the invention three that Fig. 3 A～3B illustrates.
It is generalized section according to the organic electroluminescent element of embodiments of the invention four that Fig. 4 illustrates.
It is generalized section according to the organic electroluminescent element of embodiments of the invention five that Fig. 5 illustrates.
It is generalized section according to the organic electroluminescent element of embodiments of the invention six that Fig. 6 illustrates.
It is schematic diagram according to the flat-panel screens of the above-mentioned organic electroluminescent element of the application of embodiments of the invention seven that Fig. 7 illustrates.
It is schematic diagram according to the flat-panel screens of the above-mentioned organic electroluminescent element of the application of embodiments of the invention eight that Fig. 8 illustrates.
The simple symbol explanation
10,21,22,31,32,40,51,61: organic electroluminescent element
11: substrate
12: anode
13: negative electrode
14: hole transmission layer
15: electron transfer layer
16: the first fluorescence radiation layers
17: the first phosphorescence luminescent layers
18: hole injection layer
19: electron injecting layer
20: exciton barrier-layer
23,63: the second fluorescence radiation layers
33,53: the second phosphorescence luminescent layers
70: flat-panel screens
71,81: casing
71a, 81a: front openings
72,82: display floater
80: mobile display device
83: key groups
Embodiment
Embodiment one
Please refer to Fig. 1, it illustrates is organic electroluminescent element (organic electroluminescent device, generalized section OELD) according to embodiments of the invention one.In the present embodiment, organic electroluminescent element comprises micromolecule Organic Light Emitting Diode (organic light emitting diode, OLED) and polymer LED (polymer light emitting diode, PLED), at this is that example explains with OLED, but the disclosed technology of present embodiment also can be applicable on the PLED.
In Fig. 1, organic electroluminescent element 10 comprises a substrate 11, an anode 12, a negative electrode 13, a hole transmission layer 14, an electron transfer layer 15 and at least two luminescent layers.Anode 12 and negative electrode 13 are relatively arranged on the substrate 11, and hole transmission layer 14 is arranged between anode 12 and the negative electrode 13, and electron transfer layer 15 is arranged between negative electrode 13 and the hole transmission layer 14.At least two luminescent layers are arranged between hole transmission layer 14 and the electron transfer layer 15, and a luminescent layer wherein is one first fluorescence (fluorescence) luminescent layer 16, and another luminescent layer is one first phosphorescence (phosphorescence) luminescent layer 17.
In the present embodiment, two luminescent layers can be host and guest's doped system, and for example, the first fluorescence radiation layer 16 comprises fluorescence host emitter and fluorescence visitor adulterate body, and the first phosphorescence luminescent layer 17 comprises phosphorescence host emitter and phosphorescence guest emitter, but is not limited only to above-mentioned.
When anode 12 and negative electrode 13 were applied in a voltage, electronics will be by negative electrode 13 to inject two above-mentioned luminescent layers by the mode of electron transfer layer 15, and the hole will be by anode 12 to inject two above-mentioned luminescent layers by the mode of hole transmission layer 14.When electronics and hole in two luminescent layers in conjunction with the time, phosphorescence host emitter and fluorescence host emitter will be energized into excite state by ground state.When phosphorescence host emitter and fluorescence host emitter turn back to ground state by excite state, phosphorescence host emitter and fluorescence host emitter will shift energy respectively and give phosphorescence guest emitter and fluorescence guest emitter, make phosphorescence guest emitter and fluorescence guest emitter all can produce singlet state exciton (singlet excition) and triplet exciton (triplet excition), and the ratio that generates singlet state exciton and triplet exciton is 3: 1, wherein, the singlet state exciton on the fluorescence guest emitter can discharge fluorescence in returning the process of ground state; And the triplet exciton on the phosphorescence guest emitter can discharge phosphorescence in returning the process of ground state, and the singlet state exciton can see through in self system of phosphorescence guest emitter and exchange (intemal system crossing, ISC) be converted into the triplet excited state exciton, final also discharge with the pattern of visible phosphorescence, and send visible phosphorescence and visible fluorescence simultaneously, and the first fluorescence radiation layer and the first phosphorescence luminescent layer can not absorb and influence the spectrum that it sends mutually.
As for the relative position of the first phosphorescence luminescent layer 17 and the first fluorescence radiation layer 16, in the present embodiment, the first phosphorescence luminescent layer 17 is arranged on the hole transmission layer 14, and the first fluorescence radiation layer 16 is arranged between the first phosphorescence luminescent layer 17 and the electron transfer layer 15.
In addition, organic electroluminescent element 10 also can comprise an electron injecting layer 19 and a hole injection layer 18, and electron injecting layer 19 is arranged between negative electrode 13 and the electron transfer layer 15, and hole injection layer 18 is arranged between anode 12 and the hole transmission layer 14.Organic electroluminescent element 10 also can comprise an exciton (excition) barrier layer 20, exciton barrier-layer 20 and the first phosphorescence luminescent layer, 17 adjacency.For example, exciton barrier-layer 20 is arranged between the hole transmission layer 14 and the first phosphorescence luminescent layer 17.In addition, exciton barrier-layer 20 also can be arranged between the first phosphorescence luminescent layer 17 and the first fluorescence radiation layer 16.
Yet the technical staff can also understand that the technology of present embodiment is not confined to this in the affiliated technical field of present embodiment, for example, the color of the luminous ray launched of the first fluorescence radiation layer 16 is identical haply or is different from the color of the luminous ray that the first phosphorescence luminescent layer 17 launched.The color of the luminous ray that the first fluorescence radiation layer 16 is launched comprises redness (R), green (G) or blue (B), and its wave-length coverage is 400～700 nanometers (nm).The color of the luminous ray that the first phosphorescence luminescent layer 17 is launched comprises redness (R), green (G) or blue (B), and its wave-length coverage is 400～700 (nm).The color of the light that organic electroluminescent element 10 launched is adjusted in the colour match that also can see through the luminous ray that the first fluorescence radiation layer 16 and the first phosphorescence luminescent layer 17 launched.For example, the luminous ray of being launched when the first fluorescence radiation layer 16 and the first phosphorescence luminescent layer 17 is a blue-green and when yellow, then the color of the luminous ray launched of organic electroluminescent element 10 is blue-green and the yellow dyadic subtype white (two-element white) that is mixed
As for the application of phosphorescent light-emitting materials, the material of blue phosphorescent guest emitter can be Firpic, and the material of red phosphorescent guest emitter can be (CF
3Ppy)
2Ir (pic).The material of green phosphorescent guest emitter can be Ir (ppy)
3And the material of green partially blueness (greenish-blue) phosphorescence guest emitter can be (btp)
2Ir (acac).In addition, the material of the above-mentioned phosphorescence guest emitter host emitter of being arranged in pairs or groups can be Alq
3, CBP, CDBP or TCTA.The chemical formula of above-mentioned luminescent material of giving an example is as follows:
Application as for fluorescence luminescent material, the material of red fluorescence guest emitter can be DCJTB (4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyl-julolidyl-9-enyl)-4H-pyran)), the material of yellow fluorescence guest emitter can be rubrene (Rb) or TBRb, and the material of sky blueness (sky-blue) fluorescence guest emitter can be DSA-Ph.The material of the host emitter that above-mentioned fluorescence guest emitter is arranged in pairs or groups can be Alq
3, 1,1-bis[N-(1-naphthyl)-N '-phenylamino] biphenyl-4,4 ' diamine (NPB) or MADN.The chemical formula of the above-mentioned Rb that gives an example, DSA-Ph, TBRb, MADN and DCJTB is as follows:
In addition, anode 12 and negative electrode 13 comprise metal, metal alloy or transparent conductive material, and at least one electrode is transparent or semitransparent electrode among anode 12 and the negative electrode 13.Above-mentioned transparent conductive material comprise indium tin oxide (indium tin oxide, ITO), indium-zinc oxide (indium zinc oxide, IZO), the cadmium tin-oxide (cadmium tin oxide, CTO), tin oxide (stannum dioxide, SnO
2) and zinc oxide (above-mentioned metal and metal alloy comprise gold (aurum for zinc oxide, similar transparent metal oxide such as ZnO), Au), aluminium (aluminum, Al), indium (indium, In), magnesium (magnesium, Mg) and calcium (calcium, Ca) etc.
When having only anode 12 when transparent or semitransparent, negative electrode 13 can be reflective metal, and then organic electroluminescent element 10 is bottom-emission element (bottom emission device), and substrate 11 is necessary for transparent or semitransparent substrate.When having only negative electrode 13 when transparent or semitransparent, anode 12 can be reflective metal, and then organic electroluminescent element 10 is top light emitting element (top emission device), and substrate 11 can be transparent, translucent or nontransparent substrate.When anode 12 and negative electrode 13 when being transparent or semitransparent, organic electroluminescent element 10 is double-side element (dual emission device), and substrate 11 is necessary for transparent or nontransparent substrate.
So, the configuration one phosphorescence luminescent layer of present embodiment and the design of a fluorescence radiation layer, because the luminous efficiency of phosphorescence luminescent layer is better than the luminous efficiency of fluorescence radiation layer, make that the luminous efficiency of organic electroluminescent element of present embodiment will be also better than the organic electroluminescent element (as fluorescent element) that only contains fluorescence host and guest doped system traditionally.Moreover, compared to the organic electroluminescent element (as phosphorescent element) that only contains phosphorescence host and guest doped system traditionally, the configuration one phosphorescence luminescent layer of present embodiment and the structure of a fluorescence radiation layer, make the concentration of the interior triplet exciton of element reduce, also can suppress the collision probability between the long triplet exciton of life, avoid the self-destruction phenomenon between the triplet exciton, so can make luminous efficiency unlikely being wasted on the in-fighting mechanism when height operation brightness of the organic electroluminescent element of present embodiment, its brightness and luminous efficiency are come well more than the brightness and the luminous efficiency of traditional phosphorescent element.
In the disclosed organic electroluminescent element that emits white light of present embodiment, the spectrum of its white light is made up of the emission spectrum of two or more different wave length, its form have at least in wavelength a kind of for the exciton half life be the triplet energies of μ s level and to have at least a kind of be the singlet state energy of nm level for the exciton half life.In addition, the spectrum tendency that above-mentioned white light is formed the strong energy of tool in the spectrum is the singlet state energy of nm level for the exciton half life, and the spectrum of the more weak energy of tool tendency is the triplet energies of μ s level for the exciton half life.
Embodiment two
Please be simultaneously with reference to Fig. 2 A～2B, it illustrates is two generalized sections according to the organic electroluminescent element of embodiments of the invention two.The organic electroluminescent element 21 of present embodiment and 22 organic electroluminescent elements more than 10 than embodiment one are provided with one second fluorescence radiation layer 23, and all the other something in common continue to continue to use label, and repeat no more.
In Fig. 2 A, the second fluorescence radiation layer 23 is arranged between the first fluorescence radiation layer 16 and the electron transfer layer 15.
In Fig. 2 B, the second fluorescence radiation layer 23 is arranged between the first phosphorescence luminescent layer 17 and the hole transmission layer 14, promptly is arranged between exciton barrier-layer 20 and the hole transmission layer 14.
The technical staff can also understand that the technology of present embodiment is not confined to this in the affiliated technical field of right present embodiment, and for example, organic electroluminescent element 21 and 22 also can omit the setting of electron injecting layer 19, hole injection layer 18 and exciton barrier-layer 20.In addition, the color of the luminous ray that the second fluorescence radiation layer 23 is launched is identical haply or is different from the color of the luminous ray that the first fluorescence radiation layer 16 launched, the color of the luminous ray that the second fluorescence radiation layer 23 is launched comprises redness (R), green (G) or blue (B), and its wave-length coverage is 400～700 nanometers (nm).
Slowly can't succeed in developing owing to can send the material of the phosphorescence guest emitter of blue phosphorescent at present, the white light OLED that present stage will produce full phosphorescence composition still has its degree of difficulty technically.Therefore, the fluorescence radiation layer that present embodiment can utilization can send blue-fluorescence remedies this shortcoming, and the collocation phosphorescence luminescent layer that can send redness and green phosphorescent goes out the long high efficiency white light OLED of all-wave with capable of being combined again.For example, the luminous ray of launching when the first fluorescence radiation layer 16 and the second fluorescence radiation layer 23 is blue (B) and green (G), and the luminous ray that the first phosphorescence luminescent layer 17 is launched is when red, then the color of organic electroluminescent element 21 and 22 luminous raies of the being launched three sub-prime type whites (three-element white) that will be mixed for red (R), green (G) and blue (B).In addition, more can see through the colour match of the luminous ray that the first fluorescence radiation layer 16, the first phosphorescence luminescent layer 17 and the second fluorescence radiation layer 23 launched, to adjust the color of organic electroluminescent element 21 and 21 light of being launched, be not limited only to three above-mentioned sub-prime type whites.
Embodiment three
Please be simultaneously with reference to Fig. 3 A～3B, it illustrates is two generalized sections according to the organic electroluminescent element of embodiments of the invention three.The organic electroluminescent element 31 of present embodiment and 32 organic electroluminescent elements more than 10 than embodiment one are provided with one second phosphorescence luminescent layer 33, and all the other something in common continue to continue to use label, and repeat no more.
In Fig. 3 A, the second phosphorescence luminescent layer 33 is arranged between the first phosphorescence luminescent layer 17 and the hole transmission layer 14, promptly is arranged between exciton barrier-layer 30 and the hole transmission layer 14.
In Fig. 3 B, the second phosphorescence luminescent layer 33 is arranged between the first fluorescence radiation layer 16 and the electron transfer layer 15.Above-mentioned organic electroluminescent element 31 and 32 also can comprise another exciton barrier-layer, with the adjacency second phosphorescence luminescent layer 33.
The technical staff can also understand that the technology of present embodiment is not confined to this in the affiliated technical field of right present embodiment, and for example, organic electroluminescent element 31 and 32 also can omit the setting of electron injecting layer 19, hole injection layer 18 and exciton barrier-layer 20.In addition, the color of the light that the second phosphorescence luminescent layer 33 is launched is identical haply or is different from the color of the luminous ray that the first phosphorescence luminescent layer 17 launched, the color of the luminous ray that the second phosphorescence luminescent layer 33 is launched comprises redness (R), green (G) or blue (B), and its wave-length coverage is 400～700 nanometers (nm).
In addition, also can see through the colour match of the luminous ray that the first fluorescence radiation layer 16, the first phosphorescence luminescent layer 17 and the second phosphorescence luminescent layer 33 launched, to adjust the color of organic electroluminescent element 31 and 32 luminous raies of being launched.For example, the luminous ray of launching when the first fluorescence radiation layer 16 is blue (B), and the luminous ray that the first phosphorescence luminescent layer 17 and the second phosphorescence luminescent layer 33 are launched is during for red (R) and green (G), then the color of organic electroluminescent element 31 and 32 luminous raies of the being launched three sub-prime type whites that will be mixed for red (R), green (G) and blue (B).
Embodiment four
Please refer to Fig. 4, it illustrates is generalized section according to the organic electroluminescent element of embodiments of the invention four.The organic electroluminescent element 40 of present embodiment and organic electroluminescent element 10 differences of embodiment one are the relative stack position of the first fluorescence radiation layer 16, the first phosphorescence luminescent layer 17 and exciton barrier-layer 20, all the other something in common continue to continue to use label, and repeat no more.
In Fig. 4, the first fluorescence radiation layer 16 is arranged on the hole transmission layer 14, and the first phosphorescence luminescent layer 17 is arranged between the first fluorescence radiation layer 16 and the electron transfer layer 15.In addition, exciton barrier-layer 20 and the first phosphorescence luminescent layer, 17 adjacency, for example, exciton barrier-layer 20 is arranged between the first phosphorescence luminescent layer 17 and the electron transfer layer 15.
The technical staff can also understand that the technology of present embodiment is not confined to this in the affiliated technical field of right present embodiment, and for example, exciton barrier-layer 20 can be arranged between the first phosphorescence luminescent layer 17 and the first fluorescence radiation layer 16.In addition, organic electroluminescent element 40 also can omit the setting of electron injecting layer 19, hole injection layer 18 and exciton barrier-layer 20.
Embodiment five
Please refer to Fig. 5, it illustrates is generalized section according to the organic electroluminescent element of embodiments of the invention five.The organic electroluminescent element 51 of present embodiment is provided with one second phosphorescence luminescent layer 53 than the organic electroluminescent element more than 51 of embodiment four, and all the other something in common continue to continue to use label, and repeat no more.
In Fig. 5, the second phosphorescence luminescent layer 53 is arranged between the first phosphorescence luminescent layer 17 and the electron transfer layer 15, promptly is arranged between exciton barrier-layer 20 and the electron transfer layer 15.Above-mentioned organic electroluminescent element 51 also can comprise another exciton barrier-layer, its in order to the second phosphorescence luminescent layer, 53 adjacency.
The technical staff can also understand that the technology of present embodiment is not confined to this in the affiliated technical field of right present embodiment, for example, the color of the luminous ray that the second phosphorescence luminescent layer 53 is launched is identical haply or is different from the color of the luminous ray that the first phosphorescence luminescent layer 17 launched, the color of the luminous ray that the second phosphorescence luminescent layer 33 is launched comprises redness (R), green (G) or blue (B), and its wave-length coverage is 400～700 nanometers (nm).In addition, organic electroluminescent element 51 also can omit the setting of electron injecting layer 19, hole injection layer 18 and exciton barrier-layer 20.
Embodiment six
Please refer to Fig. 6, it illustrates is generalized section according to the organic electroluminescent element of embodiments of the invention six.The organic electroluminescent element 61 of present embodiment is provided with one second fluorescence radiation layer 63 than the organic electroluminescent element more than 51 of embodiment four, and all the other something in common continue to continue to use label, and repeat no more.
In Fig. 6, the second fluorescence radiation layer 63 is arranged between the first fluorescence radiation layer 16 and the hole transmission layer 14.
The technical staff can also understand that the technology of present embodiment is not confined to this in the affiliated technical field of right present embodiment, for example, the color of the luminous ray that the second fluorescence radiation layer 63 is launched is identical haply or is different from the color of the luminous ray that the first fluorescence radiation layer 16 launched, the color of the luminous ray that the second fluorescence radiation layer 63 is launched comprises redness (R), green (G) or blue (B), and its wave-length coverage is 400～700 nanometers (nm).In addition, organic electroluminescent element 61 also can omit the setting of electron injecting layer 19, hole injection layer 18 and exciton barrier-layer 20.
Embodiment seven
Please refer to Fig. 7, it illustrates is schematic diagram according to the flat display apparatus of the above-mentioned organic electroluminescent element of the application of embodiments of the invention seven.Flat display apparatus 70 comprises computer screen, flat-surface television and monitoring screen, and in the present embodiment, flat display apparatus 70 for example is a computer screen.
In Fig. 7, flat display apparatus 70 comprises a casing 71 and a display floater 72, and display floater 72 comprises above-mentioned organic electroluminescent element 10,21,22,31,32,40,51 or 61 at least, and is arranged in the casing 71.In addition, the viewing area of display floater 72 is exposed to the external world through the front openings 71a of casing 71.
Embodiment eight
Please refer to Fig. 8, it illustrates is schematic diagram according to the mobile display device of the organic electroluminescent element of application the foregoing descriptions of embodiments of the invention eight.Mobile display device 80 comprises mobile phone, hand held game device, digital camera (digital camera, DC), digital camera camera (digital video, DV), digital broadcast device, personal digital assistant (personal digital assistant, PDA), mobile computer (notebook) and desktop computer (Table PC), in the present embodiment, mobile display device 80 for example is a mobile phone.
In Fig. 8, mobile display device 80 comprises a casing 81, a display floater 82 and a key groups 83, and display floater 82 comprises above-mentioned organic electroluminescent element 10,21,22,31,32,40,51 or 61 at least, and is arranged in the casing 81.In addition, the front openings 81a that the viewing area of display floater 82 sees through casing 81 is exposed to the external world, and key groups 83 is arranged on the front of casing 81, and is positioned at a side of display floater 81.
The disclosed organic electroluminescent element of the above embodiment of the present invention, because the luminous efficiency of phosphorescence luminescent layer is better than the luminous efficiency of fluorescence radiation layer, make that the luminous efficiency of organic electroluminescent element of present embodiment will be also better than the organic electroluminescent element (as fluorescent element) that only contains fluorescence host and guest doped system traditionally.The concentration of triplet exciton is subjected to the dilution of fluorescence exciton, will reduce the collision probability between the triplet exciton effectively, avoid taking place between the triplet exciton the suicidal phenomenon of triplet exciton, the organic electroluminescent element that can the suppress present embodiment phenomenon that luminous efficiency significantly fails when height operation brightness makes the brightness and the luminous efficiency of organic electroluminescent element of present embodiment come well more than the brightness and the luminous efficiency of traditional phosphorescent element.
Moreover, the fluorescence radiation layer that luminescent layer comprised and the phosphorescence luminescent layer of organic electroluminescent element, can considering according to display effect, color representation demand, come the increase fluorescence radiation layer of appropriateness and the number of plies of phosphorescence luminescent layer, and exciton barrier-layer 20, in the above embodiment of the present invention, though be adjacent to the phosphorescence luminescent layer with one deck exciton barrier-layer 20, if when the phosphorescence luminescent layer that has more than two layers, exciton barrier-layer 20 can be respectively in abutting connection with these phosphorescence luminescent layers, to obtain better element luminous efficiency.
In addition, the shortcoming of the full fluorescence form white light of tradition is poor efficiency, its reason nothing more than being because the lower congenital restriction of electron spin attitude apportionment ratio of fluorescence singlet state exciton.The white light of the full phosphorescence form of tradition has very high luminous efficiency, but its shortcoming is the self-destruction phenomenon of serious triplet exciton.Not the exciton of phosphorescence completely in the emission spectrum of present embodiment white light that OELD sends, be to mix the practice that adds the fluorescence exciton with phosphorescence, can allow white light still keep high efficiency and its luminous efficiency can not have significantly change along with the electric current that injects and luminosity yet, just solves the shortcoming of full fluorescence form white light of tradition and full phosphorescence form white light.
Though the present invention discloses as above with preferred embodiment; yet it is not in order to limit the present invention; those skilled in the art can do a little change and retouching without departing from the spirit and scope of the present invention, thus protection scope of the present invention should with accompanying Claim the person of being defined be as the criterion.
Claims (19)
1. organic electroluminescent element comprises:
One substrate;
The negative electrode that one anode and is oppositely arranged is arranged on this substrate;
One hole transmission layer is arranged between this anode and this negative electrode;
One electron transfer layer is arranged between this negative electrode and this hole transmission layer; And
At least two luminescent layers, be arranged between this hole transmission layer and this electron transfer layer, one of them is one first fluorescence radiation layer, and another is one first phosphorescence luminescent layer, wherein, this first fluorescence radiation layer and this first phosphorescence luminescent layer visible light that can not absorb mutually and influence respectively to be sent.
2. organic electroluminescent element as claimed in claim 1 also comprises:
One exciton barrier-layer is with this first phosphorescence luminescent layer adjacency.
3. organic electroluminescent element as claimed in claim 1, wherein, this first phosphorescence luminescent layer is arranged on this hole transmission layer, and this first fluorescence radiation layer is arranged between this first phosphorescence luminescent layer and this electron transfer layer.
4. organic electroluminescent element as claimed in claim 3 also comprises:
One second fluorescence radiation layer is arranged between this first fluorescence radiation layer and this electron transfer layer.
5. organic electroluminescent element as claimed in claim 3 also comprises:
One second fluorescence radiation layer is arranged between this first phosphorescence luminescent layer and this hole transmission layer.
6. organic electroluminescent element as claimed in claim 3 also comprises:
One second phosphorescence luminescent layer is arranged between this first phosphorescence luminescent layer and this hole transmission layer.
7. organic electroluminescent element as claimed in claim 1, wherein, this first fluorescence radiation layer is arranged on this hole transmission layer, and this first phosphorescence luminescent layer is arranged between this first fluorescence radiation layer and this electron transfer layer.
8. organic electroluminescent element as claimed in claim 7 also comprises:
One second phosphorescence luminescent layer is arranged between this first phosphorescence luminescent layer and this electron transfer layer.
9. organic electroluminescent element as claimed in claim 7 also comprises:
One second phosphorescence luminescent layer is arranged between this first fluorescence radiation layer and this hole transmission layer.
10. organic electroluminescent element as claimed in claim 7 also comprises:
One second fluorescence radiation layer is arranged between this first fluorescence radiation layer and this hole transmission layer.
11. organic electroluminescent element as claimed in claim 1 also comprises:
One electron injecting layer is arranged between this negative electrode and this electron transfer layer; And
One hole injection layer is arranged between this anode and this hole transmission layer.
12. organic electroluminescent element as claimed in claim 1, wherein, the color of the light that this first fluorescence radiation layer is launched is the color that is different from the light that this first phosphorescence luminescent layer launched haply.
13. organic electroluminescent element as claimed in claim 1, wherein, the color of the light that this first fluorescence radiation layer is launched is the color that is same as the light that this first phosphorescence luminescent layer launched haply.
14. organic electroluminescent element as claimed in claim 1, wherein, the color of the light that this first fluorescence radiation layer is launched comprises redness, green or blueness.
15. organic electroluminescent element as claimed in claim 1, wherein, the color of the light that this first phosphorescence luminescent layer is launched comprises redness, green or blueness.
16. a flat display apparatus comprises organic electroluminescent element as claimed in claim 1.
17. flat display apparatus as claimed in claim 16, wherein, this flat display apparatus comprises computer screen, flat-surface television and monitoring screen.
18. a mobile display device comprises organic electroluminescent element as claimed in claim 1.
19. mobile display device as claimed in claim 18, wherein, this mobile display device comprises mobile phone, hand held game device, digital camera, digital camera camera, digital broadcast device, personal digital assistant, mobile computer and desktop computer.
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| CN101170852B (en) * | 2007-11-14 | 2010-05-19 | 电子科技大学 | An organic EL part with ultra-thin layer structure |
| CN102270751A (en) * | 2011-07-26 | 2011-12-07 | 昆山维信诺显示技术有限公司 | Organic electrophosphorescent luminescent device and preparation method thereof |
| CN102709482A (en) * | 2012-06-26 | 2012-10-03 | 吉林大学 | Phosphorescence and fluorescence combined white organic light emitting device |
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| CN105336872A (en) * | 2015-10-09 | 2016-02-17 | 北京大学深圳研究生院 | White-light organic light-emitting diode device and preparation method thereof |
| CN105981191A (en) * | 2013-12-02 | 2016-09-28 | 株式会社半导体能源研究所 | Light-emitting element, light-emitting device, electronic appliance, and lighting device |
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| US8631598B2 (en) | 2006-03-08 | 2014-01-21 | Intematix Corporation | Light emitting sign and display surface therefor |
| US8998433B2 (en) | 2006-03-08 | 2015-04-07 | Intematix Corporation | Light emitting device utilizing remote wavelength conversion with improved color characteristics |
| CN101170852B (en) * | 2007-11-14 | 2010-05-19 | 电子科技大学 | An organic EL part with ultra-thin layer structure |
| CN102270751A (en) * | 2011-07-26 | 2011-12-07 | 昆山维信诺显示技术有限公司 | Organic electrophosphorescent luminescent device and preparation method thereof |
| CN102709482A (en) * | 2012-06-26 | 2012-10-03 | 吉林大学 | Phosphorescence and fluorescence combined white organic light emitting device |
| CN105981191A (en) * | 2013-12-02 | 2016-09-28 | 株式会社半导体能源研究所 | Light-emitting element, light-emitting device, electronic appliance, and lighting device |
| US9941483B2 (en) | 2013-12-02 | 2018-04-10 | Semiconductor Energy Laboratory Co., Ltd. | Light-emitting element, light-emitting device, electronic appliance, and lighting device |
| CN105981191B (en) * | 2013-12-02 | 2019-01-22 | 株式会社半导体能源研究所 | Light-emitting component, light emitting device, electronic equipment and lighting device |
| US10439158B2 (en) | 2013-12-02 | 2019-10-08 | Semiconductor Energy Laboratory Co., Ltd. | Light-emitting element, light-emitting device, electronic appliance, and lighting device |
| CN105336872A (en) * | 2015-10-09 | 2016-02-17 | 北京大学深圳研究生院 | White-light organic light-emitting diode device and preparation method thereof |
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| CN100472837C (en) | 2009-03-25 |
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