CN107546248A - A kind of undoped white-light emitting layer series connection organic electroluminescence device - Google Patents
A kind of undoped white-light emitting layer series connection organic electroluminescence device Download PDFInfo
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- CN107546248A CN107546248A CN201710620426.0A CN201710620426A CN107546248A CN 107546248 A CN107546248 A CN 107546248A CN 201710620426 A CN201710620426 A CN 201710620426A CN 107546248 A CN107546248 A CN 107546248A
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Abstract
The invention discloses a kind of undoped white light series connection organic electroluminescence device, it includes substrate, anode, negative electrode and organic function layer and charge generating layers between the anode and the negative electrode；The organic function layer includes undoped luminescence unit；The undoped luminescence unit includes multiple dual color light emitting units, the photochromic light for non-white light that the dual color light emitting unit sends two kinds of adjacent light of wavelength and formed；And the photochromic complementation of the multiple dual color light emitting unit obtains white light.The emitting device structure of the present invention is novel, and technique is simple, and cost is cheap.
Description
Technical field
The present invention relates to organic semiconductor technologies field, more particularly to a kind of undoped white light series connection organic electroluminescence
Part.
Background technology
OLED (English full name is Organic Light Emitting Diodes, is looked like for organic electroluminescence device,
Abbreviation OLED) have from main light emission, visual angle is wide, in light weight, Acclimation temperature scope is wide, area is big, all solidstate, flexibility, power consumption
The many merits such as low, fast response time and manufacturing cost are low, there is important application with lighting field in display, thus learned
The extensive concern of art circle and industrial quarters.
In order to further improve the efficiency of device and life-span, multiple independent luminescence units are stacked up by researcher, are made
An equal amount of electric current successively flows through multiple different luminescence units and carries out common light so as to improve luminosity and efficiency, shape
Articulamentum generally is used as by multiple hairs with charge generating layers (charge generation layer, CGL) into tandem OLED
Light unit devices in series gets up compared with single-shot light unit device, and the current efficiency and luminosity of Tandem devices can
It is multiplied, and under same brightness, the current density of Tandem devices is relatively low, thus its life-span also greatly increases .2005,
Ma Dongge of Changchun Institute of Applied Chemistry et al. reports series connection WOLED first, and the structure of device is：ITO/NPB/DNA/BCP/Alq3/
BCP:Li/V2O5/NPB/Alq3:DCJTB/Alq3/ LiF/Al (Appl.Phys.Lett.2005,87,173510.) wherein with
DNA/BCP/Alq3Blue light and green glow, Alq are produced as the first luminescence unit3:DCJTB produces feux rouges as the second luminescence unit,
BCP:Li/V2O5Two luminescence unit holes are effectively connected as charge generating layers and electronics produces in charge generating layers,
Under electric field action, adjacent NPB and Alq are respectively transmitted to3Layer in and they pass through contrast the first luminescence unit it is bluish-green
Optical device (2.2cdA-1,0.5lm·W-1,890cd·m-2) and the second luminescence unit red device (6cdA-1,
2.1lm·W-1,8300cd·m-2), the current efficiency and brightness for finding series connection WOLED are both greater than two single-shot light unit devices
Summation (maximal efficiency is up to 10.7cdA-1, high-high brightness 10200cdm-2), and power efficiency is then equal to two single-shots
Summation (the 2.6lmW of light unit device-1) simultaneously, Chang et al. is using the relatively low Mg of optical absorptivity:Alq3/WO3As
Charge generating layers, two single white-light emitting units are connected, find to be influenceed by microcavity effect, the efficiency for the WOLED that connects
(22cd·A-1) it is three times of single-shot light unit device, and in 100cdm-2Under brightness, the life-span is more than 80000h
(Appl.Phys.Lett.2005,87,253501.) is nearest, and Son et al. synthesizes a kind of efficient blue phosphorescent main body first
(TATA), can obtain based on the luminous high efficiency blue OLED (46.2cdA of FIrpic-1,45.4lm·W-1), and will be efficient
Gold-tinted elementary layer (86.8cdA-1,90.5lm·W-1) pass through charge generating layers TmPyPB：Rb2CO3/ Al/HAT-CN is connected
Connect devices opens bright voltage (brightness 1cdm-2) as little as 4.55V, maximum power efficiency 65.4lmW-1, maximum current
Efficiency is 129.5cdA-1, maximum external quantum efficiency is 49.5%. even in 1000cdm-2Under brightness, the power effect of device
It is 63.1lmW that rate, which still may be up to,-1, current efficiency is up to 128.8cdA-1, external quantum efficiency is up to 49.2%, and this is fully opened up
Good prospect (J.Mater.Chem.C 2013,1,5008.) of tandem OLED is shown
At present on document white light Tandem devices it is complicated, and be required for applying to doping techniques prepare it is luminous
Layer；In addition only have one kind photochromic inside a general luminescence unit, be unfavorable for device high color rendering index (CRI).
The organic electroluminescence in view of the shortcomings of the prior art, a kind of novel, simple in construction, technique of offer is simply connected
Part is to overcome prior art deficiency very necessary.
The invention provides a kind of undoped white light series connection organic electroluminescence device, including substrate, anode, negative electrode and Jie
Organic function layer and charge generating layers between the anode and the negative electrode；
The organic function layer includes undoped luminescence unit, and the luminescent layer unit is including at least a dual color light emitting
Unit；
The dual color light emitting unit formed it is photochromic be non-white light；
The dual color light emitting unit by two kinds of adjacent wavelength it is photochromic formed, this purpose is to more easily adjust series connection
Microcavity effect in device.Because being compared with single-shot light unit device, the microcavity effect of Tandem devices is more obvious, it is necessary to is subject to
Consider, and be no longer now Lambertian source.When adjacent wavelength it is photochromic be located at same luminescence unit in when, advantageously
In regulation microcavity effect, because the photochromic resonant cavity of adjacent wavelength is adjacent.
For each luminescence unit, they are formed by difference is photochromic, and white light is obtained by complementation；
Luminescent layer order in the white-light emitting unit can carry out evolution as needed；
Luminescent layer inside the luminescence unit is made up of non-doped layer, can so substantially reduce device technology,
Save time and cost；
Every layer of light emitting layer thickness inside the luminescence unit can be 0.1-200nm；
Further, every layer of light emitting layer thickness inside the luminescence unit is preferably 0.01-100nm；
Luminescent layer inside the luminescence unit can be with direct neighbor, can also be non-conterminous；In order to avoid excessive energy
When transfer or concentration quenching, then the luminescent layer inside the luminescence unit needs spacer layer separates to come；
The thickness of the wall can be 0.1-30nm；
Further, the thickness of wall is preferably 0.1-10nm；
The wall is also prepared using undoped technology, can simplify technique；
The energy level of the wall will be matched with the direct energy level of luminescent layer, especially triplet otherwise be less than
The triplet 0.2eV of the luminescent layer contacted, avoids excessive exciton from being quenched, and influences the efficiency of device；
The charge generating layers connect the undoped white-light emitting unit of N layers, and wherein N >=2, charge generating layers can have
Effect produces hole and electronics so that the efficiency of device greatly increases, and is advantageous to the life-span of device
The charge generating layers connect luminescence unit, and the position of each luminescence unit can be adjusted as needed
Change, without influenceing the present invention, i.e., the first luminescence unit can be exchanged with N luminescence units.
Brief description of the drawings
Fig. 1 is a kind of one of which structural representation of undoped white-light emitting layer series connection organic electroluminescence device of the present invention
Figure；
Fig. 2 is a kind of one of which structural representation of undoped white-light emitting layer series connection organic electroluminescence device of the present invention
Figure；
Fig. 3 is a kind of one of which structural representation of undoped white-light emitting layer series connection organic electroluminescence device of the present invention
Figure；
Fig. 4 is a kind of one of which structural representation of undoped white-light emitting layer series connection organic electroluminescence device of the present invention
Figure；
Fig. 5 is a kind of one of which structural representation of undoped white-light emitting layer series connection organic electroluminescence device of the present invention
Figure；
Fig. 6 is a kind of one of which structural representation of undoped white-light emitting layer series connection organic electroluminescence device of the present invention
Figure；
Fig. 7 is a kind of one of which structural representation of undoped white-light emitting layer series connection organic electroluminescence device of the present invention
Figure；
Fig. 8 is a kind of one of which structural representation of undoped white-light emitting layer series connection organic electroluminescence device of the present invention
Figure；
Fig. 9 is a kind of one of which structural representation of undoped white-light emitting layer series connection organic electroluminescence device of the present invention
Figure；
Figure 10 is that a kind of one of which structure of undoped white-light emitting layer series connection organic electroluminescence device of the present invention is shown
It is intended to；
Figure 11 is a kind of performance for undoped white-light emitting layer series connection organic electroluminescence device that embodiment 1 is prepared
Figure；
Embodiment
Embodiment 1
A kind of undoped white-light emitting layer series connection organic electroluminescence device A, device A structure are：ITO/HAT-CN
(100nm)/NPB(15nm)/TCTA(5nm)/DSA-ph(0.5nm)/Bepp2(15nm)/Bepp2:KBH4(10nm, 15%)/
HAT-CN(110nm)/NPB(15nm)/TCTA(5nm)/Ir(MDQ)2(acac)(0.3nm)/TCTA(1nm)Ir(dmppy)2
(dpp)(0.9nm)/TmPyPB(50nm)/Cs2CO3(1nm)/Al(200nm)。
Device A structure is added by following functions stacking successively：
Substrate, anode, hole injection layer, hole transmission layer, blue fluorescent body, electron transfer layer, electron injecting layer, electric charge
Generation layer, hole transmission layer, red phosphorescent layer, wall, yellow phosphorescence layer, electron transfer layer, electron injecting layer, negative electrode.
Aforesaid substrate is glass.
Above-mentioned anode is ito thin film.
Above-mentioned hole injection layer is the thick HAT-CN films of 100nm.
Above-mentioned hole transmission layer includes the hole transmission layer 1 and hole transmission layer 2 stacked gradually, the hole transmission layer 1
For the thick NPB films of 15nm, the hole transmission layer 2 is the thick TCTA films of 5nm.
Above-mentioned blue fluorescent body is 0.5nm DSA-ph films.
Above-mentioned electron transfer layer is the thick Bepp of 15nm2Film.
Above-mentioned electron transfer layer is the thick Bepp of 10nm2:KBH4Film.
Above-mentioned charge generating layers are 110nm thick HAT-CN and 15nm NPB films.
Above-mentioned hole transmission layer is the thick TCTA films of 5nm.
Above-mentioned red phosphorescent layer is 0.3nm Ir (MDQ) 2 (acac) film.
Above-mentioned wall is 1nm TCTA films.
Above-mentioned yellow phosphorescence layer is the thick Ir (dmppy) of 0.9nm2(dpp) film.
Above-mentioned electron transfer layer is the thick TmPyPB films of 50nm.
Above-mentioned electron injecting layer is the thick Cs of 1nm2CO3Film.
Above-mentioned negative electrode is the thick Al films of 200nm.
The undoped white-light emitting layer series connection organic electroluminescence device A is prepared by the following method：
1st, ito thin film is prepared as anode using sputtering method on substrate.
2nd, the HAT-CN for preparing 100nm using vacuum deposition method on anode again is used as hole injection layer.
3rd, the NPB films for preparing 15nm thickness using vacuum deposition method on above-mentioned hole injection layer are used as hole transmission layer
1。
4th, the TCTA films for preparing 5nm thickness using vacuum deposition method on above-mentioned hole injection layer 1 are used as hole transport
Layer 2.
5th, the DSA-ph films for preparing 0.5nm thickness using vacuum deposition method on above-mentioned hole injection layer 2 are used as blueness
Fluorescence coating.
7th, the Bepp of 15nm thickness is prepared with vacuum deposition method on above-mentioned red phosphorescent layer2Film is as electric transmission
Layer.
8th, the Bepp of 10nm thickness is prepared with vacuum deposition method on layer by layer in above-mentioned electric transmission2：KBH4 film conducts
Electron injecting layer.
9th, 110nm thick HAT-CN and 15nm NPB films are prepared with vacuum deposition method on above-mentioned electron injecting layer
Thickness is used as charge generating layers.
10th, the TCTA films for preparing 5nm thickness using vacuum deposition method on above-mentioned charge generating layers are used as hole transport
Layer.
11st, on above-mentioned hole injection layer using vacuum deposition method prepare 0.3nm (acac) films of Ir (MDQ) 2 as
Red phosphorescent layer.
12nd, the TCTA films for preparing 1nm thickness using vacuum deposition method on above-mentioned blue phosphorescent layer are used as wall.
13rd, the Ir (dmppy) of 0.9nm thickness is prepared with vacuum deposition method on above-mentioned wall2(dpp) film conduct
Yellow phosphorescence layer.
14, the TmPyPB films for preparing 50nm thickness using vacuum deposition method on above-mentioned blue phosphorescent layer pass as electronics
Defeated layer.
15th, 1nm Cs is prepared with vacuum deposition method on above-mentioned electron transfer layer2CO3Film is as electron injecting layer.
16th, the Al films for preparing 200nm using vacuum deposition method on above-mentioned electron injecting layer are used as negative electrode.
The above-mentioned device A being prepared performance is detected, device A spectrogram is as shown in figure 11.Device A exists
Chromaticity coordinates under 1000cd/m2 is (0.35,0.41).
And in device A preparation technology, luminescent layer is not related to the use of any doping techniques, have simple process,
The advantages of cost is low.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope that this specification is recorded all is considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that come for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (9)
1. a kind of undoped white light series connection organic electroluminescence device, it include substrate, anode, negative electrode and between the anode and
Organic function layer and charge generating layers between the negative electrode；
Characterized in that,
The anode arrangement on the substrate, hole injection layer has been sequentially arranged on the anode to the direction of the negative electrode
And hole transmission layer, electron injecting layer and electron transfer layer have been sequentially arranged to the direction of the anode on the negative electrode, in institute
The direction for stating the lateral negative electrode of charge generating layers one has been sequentially arranged hole injection layer and hole transmission layer and another at its
The direction of the lateral anode has been sequentially arranged electron injecting layer and electron transfer layer；
The organic function layer includes multiple dual color light emitting units, and it is adjacent that each dual color light emitting unit sends two kinds of wavelength
Light and the photochromic light for non-white light formed；And the photochromic complementation of the multiple dual color light emitting unit obtains white light.
2. undoped white light series connection organic electroluminescence device as claimed in claim 1, it is characterised in that the multiple double-colored
Each dual color light emitting unit of luminescence unit forms a luminescent layer in the organic function layer；The luminescent layer is non-mixes
Diamicton, and its order in the organic function layer can carry out evolution as needed.
3. undoped white light series connection organic electroluminescence device as claimed in claim 2, it is characterised in that the luminous thickness
Spend for 0.1-200nm.
4. undoped white light series connection organic electroluminescence device as claimed in claim 2, it is characterised in that the luminous thickness
Spend for 0.01-100nm.
5. the undoped white light series connection organic electroluminescence device as described in one of claim 2-4, it is characterised in that different
Can be with adjacent between luminescent layer, can also be non-conterminous.
6. undoped white light series connection organic electroluminescence device as claimed in claim 5, it is characterised in that adjacent luminescent layer
Between isolated by undoped separation layer.
7. undoped white light series connection organic electroluminescence device as claimed in claim 6, it is characterised in that
The thickness of the wall is 0.1-30nm.
8. undoped white light series connection organic electroluminescence device as claimed in claim 6, it is characterised in that
The thickness of the wall is 0.1-10nm.
9. the undoped white light series connection organic electroluminescence device as described in one of claim 1-8, it is characterised in that the electricity
Lotus generation layer is arranged between luminescent layer.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108682748A (en) * | 2018-03-30 | 2018-10-19 | 广东工业大学 | A kind of series connection white light organic electroluminescent device |
| CN108807710A (en) * | 2018-07-11 | 2018-11-13 | 重庆赛宝工业技术研究院 | Undoped organic electroluminescence device and the preparation method of connecting with the complementary white light of doping |
| WO2020010647A1 (en) * | 2018-07-10 | 2020-01-16 | 上海视欧光电科技有限公司 | Top-emission-type microcavity oled display apparatus |
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| CN104078604A (en) * | 2013-03-29 | 2014-10-01 | 海洋王照明科技股份有限公司 | White organic light-emitting diode and manufacturing method thereof |
| CN104953036A (en) * | 2014-03-27 | 2015-09-30 | 乐金显示有限公司 | Organic light emitting device and display device |
| CN105489783A (en) * | 2016-01-22 | 2016-04-13 | 工业和信息化部电子第五研究所 | Non-doped white light organic electroluminescence device |
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2017
- 2017-07-26 CN CN201710620426.0A patent/CN107546248A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104078604A (en) * | 2013-03-29 | 2014-10-01 | 海洋王照明科技股份有限公司 | White organic light-emitting diode and manufacturing method thereof |
| CN104953036A (en) * | 2014-03-27 | 2015-09-30 | 乐金显示有限公司 | Organic light emitting device and display device |
| CN105489783A (en) * | 2016-01-22 | 2016-04-13 | 工业和信息化部电子第五研究所 | Non-doped white light organic electroluminescence device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108682748A (en) * | 2018-03-30 | 2018-10-19 | 广东工业大学 | A kind of series connection white light organic electroluminescent device |
| WO2020010647A1 (en) * | 2018-07-10 | 2020-01-16 | 上海视欧光电科技有限公司 | Top-emission-type microcavity oled display apparatus |
| US11183668B2 (en) | 2018-07-10 | 2021-11-23 | Seeya Optronics Co., Ltd. | Top-emission type micro cavity OLED display device |
| CN108807710A (en) * | 2018-07-11 | 2018-11-13 | 重庆赛宝工业技术研究院 | Undoped organic electroluminescence device and the preparation method of connecting with the complementary white light of doping |
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