CN100407437C - White light organic luminous assembly - Google Patents
White light organic luminous assembly Download PDFInfo
- Publication number
- CN100407437C CN100407437C CN2005100992296A CN200510099229A CN100407437C CN 100407437 C CN100407437 C CN 100407437C CN 2005100992296 A CN2005100992296 A CN 2005100992296A CN 200510099229 A CN200510099229 A CN 200510099229A CN 100407437 C CN100407437 C CN 100407437C
- Authority
- CN
- China
- Prior art keywords
- layer
- luminescent layer
- luminescent
- assembly
- symmetrical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Electroluminescent Light Sources (AREA)
Abstract
The present invention relates to a white light organic luminous assembly which comprises two symmetrical luminous layers and a middle luminous layer, wherein a first light color with almost the same frequency is generated from the two symmetrical luminous layers. The middle luminous layer is positioned between the two symmetrical luminous layers. A second light color is generated from the middle luminous layer. The main frequency of the second light color is different from the main frequency of the first light color, wherein when voltage applied on the organic luminous assembly is changed to result in that the luminous quantity of one symmetrical luminous layer is reduced, the luminous quantity of the other symmetrical luminous layer is automatically increased to compensate luminous quantity reduced from the first luminous layer.
Description
Technical field
The invention relates to a kind of luminescence component, and particularly relevant for a kind of organic luminescent assembly.
Background technology
Can emit Organic Light Emitting Diode (the white organic light emitting diode of white light; WOLED) can make by individual layer or double-deck above luminescent layer, but same WOLED differs in the following photochromic performance of different operating voltages.Meaning promptly applies different operating voltages to same WOLED, has the problem of color displacement.
Known a kind of WOLED structure, its each layer structure is respectively base material, anode (ITO), hole injection layer (PEDOT:PSS in regular turn, 40nm), hole transmission layer (α-NPD, 40nm), blue light-emitting ((CF3ppy) 2Ir (pic): CDBP, 25nm), hole blocking layer (BAlq, 3nm), red light luminescent layer (Ir (btp) 2 (acac): CDBP, 10nm), electron transfer layer (BAlq, 45nm), electron injecting layer (LiF, 0.5nm) with negative electrode (Al, 150nm).Above-mentioned WOLED is when operating voltage is high more, the ruddiness of red light luminescent layer (600nm-700nm) luminous intensity is big more, makes luminous photochromicly (to please refer to Current Applied Physics 2005, Vol.5 to red shift, pp.331-336), the degree of difficulty of WOLED glow color control is increased.
Summary of the invention
Therefore the object of the present invention is to provide a kind of white light organic luminous assembly, can compensate the phenomenon that produces photochromic skew because of change in voltage.
Another object of the present invention is to provide a kind of white light organic luminous assembly, its manufacture process is easy, can reduce the phenomenon of photochromic skew again.
Another purpose of the present invention is to provide a kind of white light organic luminous assembly, and its modular construction is simple, can reduce the phenomenon of photochromic skew again.
According to above-mentioned purpose of the present invention, a kind of symmetrical expression organic luminescent assembly is proposed.According to one embodiment of the present invention, this structure comprises two symmetrical luminescent layers and a middle luminescent layer.This two-layer symmetrical luminescent layer produces the first photochromic of about same frequency.Middle luminescent layer is positioned in the middle of this two-layer symmetrical luminescent layer.Luminescent layer produces second photochromicly in the middle of this, and this second photochromic main frequency is different with the first photochromic main frequency.The voltage that wherein ought put on this symmetrical expression organic luminescent assembly changes, and when causing the luminous quantity minimizing of a symmetrical luminescent layer, another symmetrical luminescent layer increases luminous quantity automatically, to compensate the luminous quantity that first luminescent layer reduces.
By the invention described above preferred embodiment as can be known, because WOLED assembly of the present invention respectively settles one deck with photochromic luminescent layer at the dual-side of multilayer luminescent layer, therefore can solve the problem that produces photochromic skew because of change in voltage.
Description of drawings
The present invention is above-mentioned to be become apparent with other purpose, feature, advantage and embodiment in order to make, and accompanying drawing is described in detail as follows:
The 1st figure is the change curve of assembly one to the x axle of the cie color value of assembly four.
The 2nd figure is the change curve of assembly one to the y axle of the cie color value of assembly four.
The 3rd illustrates the material energy level diagram of known tip assemblies one and assembly two, the numeral that indicates in each rectangular lower end is the energy rank value of highest occupied molecular orbital (HOMO), the numeral that indicates in each rectangular upper end is the energy rank value of lowest unoccupied molecular orbital (LUMO), and unit is an electron-volt.
The 4th illustrates according to the assembly three of the preferred embodiment of the present invention and the material energy level diagram of assembly four, the numeral that indicates in each rectangular lower end is the energy rank value of highest occupied molecular orbital (HOMO), the numeral that indicates in each rectangular upper end is the energy rank value of lowest unoccupied molecular orbital (LUMO), and unit is an electron-volt.
Embodiment
The invention provides a kind of white organic LED (WOLED), the structure that utilization is respectively settled the more weak a certain colour light emitting layer of luminous intensity in the both sides of multilayer luminescent layer is improved the photochromic problem that changes with change in voltage of the WOLED with multilayered color-forming luminescent layer.
(the CIE of Commission Internationale De L'Eclairage; Commission International d Eclairage) (x, y) value is (0.33,0.33) to the chromaticity coordinates of the standard white of being worked out.But also has other different white, as cold white, color of sunshine, warm white, purple white etc., so the cie color value of white light has a sizable excursion.But for desirable WOLED, under different operating voltage, no matter the variation (δ) of the x numerical value of its CIE chromaticity coordinates of hope or y numerical value can both be in 0.04.
Make and test four kinds of WOLED assemblies in embodiments of the present invention, except the structure of multilayer luminescent layer was different, other each layer structure was all identical.Each layer structure of four kinds of WOLED assemblies is negative electrode (aluminium, 1500 respectively in regular turn
), electron injecting layer (LiF, 10
), electron transfer layer (BAlq, 300
), multilayer luminescent layer, hole transmission layer (NPB, 200
), hole injection layer (IDE 406:F4,1500
), anode (ITO).The structure of the multilayer luminescent layer of above-mentioned four kinds of WOLED then please see Table one, and wherein assembly one does not add symmetrical red light luminescent layer with assembly two, and is identical with the design of known WOLED luminescent layer; And, then added symmetrical red light luminescent layer in the both sides of blue light-emitting according to the preferred embodiment of the present invention designed assembly three and assembly four.
Table one: assembly one is from top to bottom listed according to the order from anode to negative electrode to the luminescent layer design of assembly four.
Table two: assembly one is to the blue light of assembly four and the experimental result of red light-emitting intensity and cie color value.
| WOLED | Operating voltage range (V) | The variation ratio of red light intensity | The cie color changing value |
| Assembly one (R 100/B 100) | 5-10 | 29.8％ | (0.13，0.02) |
| Assembly two (R100/B200) | 6-10 | 57.1％ | (007，0.02) |
| Assembly three (R50/B200/R50) | 7-12 | 66.3％ | (0.05，0.01) |
| Assembly four (R50/B 150/R50) | 7-12 | (0.03，＜0.01) |
The above-mentioned assembly of discussing to the interpretation of assembly four in table two, and 1-2 figure is asked for an interview in assembly one to the variation of assembly four cie color values.Wherein the 1st figure is the change curve of assembly one to the x axle of the cie color value of assembly four, and the 2nd figure is the change curve of assembly one to the y axle of the cie color value of assembly four.
Please also refer to table two and 1-2 figure, above-mentioned assembly one (R100/B100) is when operating voltage slowly increases to 10V by 5V, and the luminous intensity of blue light is nearly all the same, and the luminous relative intensity of the crest of blue spectrum (about 466nm) maintains about 1 all the time.But the luminous relative intensity of red-light spectrum crest (about 625nm) is decremented to about 0.7 by 2.35, that is the red light-emitting intensity of operating voltage when 10V 29.8% when having only 5V.The cie color value of assembly one then changes over (0.34,0.30) by (0.47,0.32), and amplitude of fluctuation is up to (0.13,0.02).
At the thickness that increases blue light-emitting, form said modules two (R100/B200) afterwards, also change operating voltage and inquire into the variation of its blue light and red light-emitting intensity and the variation of cie color value.Found that when operating voltage slowly increases to 10V by 6V the luminous intensity of assembly two blue lights is nearly all the same, the luminous relative intensity of the crest of blue spectrum (about 466nm) maintains about 1 all the time.But the luminous relative intensity of red-light spectrum crest (about 625nm) is decremented to about 0.2 by 0.35, that is the red light-emitting intensity of operating voltage when 10V 57.1% when having only 6V.The cie color value of assembly two then changes over (0.23,0.26) by (0.30,0.28), and amplitude of fluctuation is (0.07,0.02).Reduce though the y value amplitude of fluctuation of CIE has slightly, but still surpass desirable excursion.
Experimental result by assembly one and assembly two finds that the glow color of assembly one and assembly two has blue offset phenomena under high voltage.Therefore, settle another layer red light luminescent layer again at the opposite side of blue light-emitting layer, form the structure that two-layer red light luminescent layer clips one deck blue light-emitting, hope can solve red light-emitting intensity problem of unstable.
Please also refer to table two and 1-2 figure, for example said modules three (R50/B200/R50) is though used two-layer red light luminescent layer, and the gross thickness of red light luminescent layer still maintains 100
Found that when operating voltage slowly increases to 12V by 7V the luminous intensity of assembly three blue lights is also nearly all the same, the luminous relative intensity of the crest of blue spectrum (about 466nm) maintains about 1 all the time.But the luminous relative intensity of red-light spectrum crest (about 625nm) only is decremented to about 0.63 by 0.95, that is 66.3% during the existing 7V of the red light-emitting intensity of operating voltage when 12V.The cie color value of assembly three then changes over (0.38,0.27) by (0.43,0.28), and amplitude of fluctuation is (0.05,0.01), has soon met in the desirable CIE excursion (0.04).
The thickness of the blue light-emitting of assembly three (R50/B200/R50) is reduced to 150
Form assembly four (R50/B150/R50) afterwards, also change operating voltage and inquire into the variation of its blue light and red light-emitting intensity and the variation of cie color value.When operating voltage slowly increased to 12V by 7V, the cie color value was then changed over (0.43,＞0.28) by (0.46,0.29), and amplitude of fluctuation also is about (0.03,＜0.01), had all met in the desirable CIE excursion (0.04).
By the experimental result of assembly three and assembly four as can be known, even do not increase the thickness of red light luminescent layer, just allow the identical red light luminescent layer of two layers of thickness be clipped in the both sides of blue light-emitting, can significantly improve the problem of the blue displacement that the WOLED glow color produced after promoting operating voltage.If can be again regulate and control, can further control the WOLED glow color again with the different problems that change of operating voltage at the selection of the luminescent material of each layer luminescent layer and the Thickness Design of each layer luminescent layer.
The photochromic meeting of known WOLED has different cie color values with the operating voltage difference, and it is former because zone of electronics and hole compound in luminescent layer (recombine) can be offset along with the variation of operating voltage.Please refer to the 3rd figure, it shows the material energy level diagram of known tip assemblies one and assembly two, the numeral that indicates in each rectangular lower end is the energy rank value of highest occupied molecular orbital (HOMO), the numeral that indicates in each rectangular upper end is the energy rank value of lowest unoccupied molecular orbital (LUMO), and unit is an electron-volt.In the 3rd figure, hole transmission layer 310, red light luminescent layer 320, blue light-emitting 330 and electron transfer layer 350 only are shown by anode to the direction of negative electrode.Assembly one and assembly two when low operating voltage, anode and negative electrode respectively hole and the electronics of generation can combine again with the interface of blue light-emitting layer 330 and form exciton (exciton) at red light emitting layer 320, exciton is emitted photon again and is got back to ground state then.When high operation voltage, the past cathode direction of formation place of exciton meeting moves and away from red light luminescent layer 320, makes the luminous intensity of red light luminescent layer reduce.
Please refer to the 4th figure, it shows according to the assembly three of the preferred embodiment of the present invention and the material energy level diagram of assembly four, the numeral that indicates in each rectangular lower end is the energy rank value of highest occupied molecular orbital (HOMO), the numeral that indicates in each rectangular upper end is the energy rank value of lowest unoccupied molecular orbital (LUMO), and unit is an electron-volt.In the 4th figure, only show hole transmission layer 410, red light luminescent layer 420, blue light-emitting 430, red light luminescent layer 440 and electron transfer layer 450 by anode to the direction of negative electrode.According to the preferred embodiment of the present invention, respectively settle identical red light luminescent layer of a layer thickness 420 and red light luminescent layer 440 in the both sides of blue light-emitting 430.When low behaviour lives voltage, the centre of the comparatively close blue light-emitting 430 of exciton formation place.When high operation voltage, exciton formation place is still moved toward negative electrode, and the luminous intensity of red light luminescent layer 420 is descended.But, also having red light luminescent layer 440 can send ruddiness near the negative electrode place, red light intensity that therefore can reinforcement red light luminescent layer 420, and allow the red light intensity of WOLED can be different and not alter a great deal along with operating voltage.
In a preferred embodiment of the invention, though the thickness of two-layer red light emitting layer is the same with material, also can be designed to thickness and material two-layer red light emitting layer inequality.
According to identical principle, make the multilayer luminescent layer of WOLED assembly, as red-blue-red, red-green-red, R-G-B-green-red, R-G-B-red, R-G-B-red, red-blue-green red, blue-red-green-red-blue, indigo plant-green-red-indigo plant.As long as in luminescent layer both sides outermost is photochromic the same or approximate luminescent layer, no matter exciton can obtain the compensation of the luminous intensity of this direction toward what direction diffusion.
By the invention described above preferred embodiment as can be known, because WOLED assembly of the present invention respectively settles one deck with photochromic luminescent layer at the dual-side of multilayer luminescent layer, therefore can solve the problem that produces photochromic skew because of change in voltage.
Though the present invention discloses as above with a preferred embodiment; right its is not in order to limit the present invention; any those of ordinary skill in the art; without departing from the spirit and scope of the present invention; when can doing various modifications and retouching, thus protection scope of the present invention should with claim the person of being defined be as the criterion.
The primary clustering symbol description
310: hole transmission layer 330: blue light-emitting
410: hole transmission layer 430: blue light-emitting
450: electron transfer layer 320: red light luminescent layer
350: electron transfer layer 420: red light luminescent layer
440: red light luminescent layer
Claims (8)
1. organic luminescent assembly comprises:
First luminescent layer, photochromic for producing one first;
Second luminescent layer, first photochromic for producing this; And
The 3rd luminescent layer, between described first luminescent layer and described second luminescent layer, described the 3rd luminescent layer is photochromic for producing second, wherein said second is photochromic and described first photochromic different, when the voltage that puts on described organic luminescent assembly changes, when causing the luminous quantity minimizing of described first luminescent layer, described second luminescent layer increases luminous quantity automatically, to compensate the luminous quantity that described first luminescent layer reduces;
Described first luminescent layer and second luminescent layer are respectively outermost luminescent layer.
2. organic luminescent assembly as claimed in claim 1, wherein said first luminescent layer and described second luminescent layer have identical materials.
3. organic luminescent assembly as claimed in claim 1 more comprises the 4th luminescent layer, and between described second luminescent layer and described the 3rd luminescent layer, described the 4th luminescent layer is the 3rd photochromic for producing, and the described the 3rd is photochromic and described first photochromic different.
4. organic luminescent assembly as claimed in claim 1, also comprise hole transmission layer and electron transfer layer, described first luminescent layer, described the 3rd luminescent layer and described second luminescent layer are between described hole transmission layer and described electron transfer layer, and described hole transmission layer is adjacent to described first luminescent layer, and described electron transfer layer is adjacent to described second luminescent layer.
5. symmetrical expression organic luminescent assembly comprises:
Two-layer symmetrical luminescent layer, described two-layer symmetrical luminescent layer produce the first photochromic of same frequency; And
Middle luminescent layer, be positioned in the middle of the described two-layer symmetrical luminescent layer, luminescent layer produces second photochromic in the middle of described, the described second photochromic main frequency is different with the described first photochromic main frequency, when the voltage that puts on described symmetrical expression organic luminescent assembly changes, when causing the luminous quantity minimizing of a symmetrical luminescent layer, another symmetrical luminescent layer increases luminous quantity automatically, to compensate the luminous quantity that described one symmetrical luminescent layer reduces;
Described two-layer symmetrical luminescent layer is respectively outermost luminescent layer.
6. organic luminescent assembly as claimed in claim 5, wherein said two-layer symmetrical luminescent layer has identical materials.
7. organic luminescent assembly as claimed in claim 5 also comprises luminescent layer in the middle of another, between described two-layer symmetrical luminescent layer, described in the middle of another luminescent layer produce the 3rd photochromicly, the described the 3rd is photochromic and described first photochromicly have different main frequencies.
8. organic luminescent assembly as claimed in claim 5, also comprise a hole transmission layer and an electron transfer layer, described two-layer symmetrical luminescent layer and described middle luminescent layer are between described hole transmission layer and described electron transfer layer, and described hole transmission layer is adjacent to a symmetrical luminescent layer, and described electron transfer layer is adjacent to another symmetrical luminescent layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100992296A CN100407437C (en) | 2005-09-07 | 2005-09-07 | White light organic luminous assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100992296A CN100407437C (en) | 2005-09-07 | 2005-09-07 | White light organic luminous assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1738498A CN1738498A (en) | 2006-02-22 |
| CN100407437C true CN100407437C (en) | 2008-07-30 |
Family
ID=36081108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2005100992296A Active CN100407437C (en) | 2005-09-07 | 2005-09-07 | White light organic luminous assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100407437C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104347808B (en) * | 2014-09-16 | 2017-06-23 | 太原理工大学 | A kind of color stability white light organic electroluminescent device high |
| CN106229334B (en) * | 2016-10-19 | 2018-11-23 | 武汉华星光电技术有限公司 | A kind of OLED device and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1070315C (en) * | 1998-11-06 | 2001-08-29 | 吉林大学 | White-light electroluminescence device with organic multi-quantum pit structure |
| JP2005056866A (en) * | 2004-11-29 | 2005-03-03 | Toyota Industries Corp | Organic el device and color organic el display |
| JP2005150081A (en) * | 2003-10-24 | 2005-06-09 | Pentax Corp | White organic electroluminescent element |
| CN1700486A (en) * | 2004-05-18 | 2005-11-23 | 胜华科技股份有限公司 | White light organic electroluminescent device |
-
2005
- 2005-09-07 CN CN2005100992296A patent/CN100407437C/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1070315C (en) * | 1998-11-06 | 2001-08-29 | 吉林大学 | White-light electroluminescence device with organic multi-quantum pit structure |
| JP2005150081A (en) * | 2003-10-24 | 2005-06-09 | Pentax Corp | White organic electroluminescent element |
| CN1700486A (en) * | 2004-05-18 | 2005-11-23 | 胜华科技股份有限公司 | White light organic electroluminescent device |
| JP2005056866A (en) * | 2004-11-29 | 2005-03-03 | Toyota Industries Corp | Organic el device and color organic el display |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1738498A (en) | 2006-02-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI279165B (en) | White organic light emitting diode | |
| US6447934B1 (en) | Organic electroluminescent panel | |
| KR101352116B1 (en) | White Organic Light Emitting Device | |
| KR101223719B1 (en) | White organic light-emitting device and the method for preparing the same | |
| CN1638566B (en) | Organic EL element and method of forming the same | |
| CN100405631C (en) | Full color organic electroluminescent device | |
| CN101223651B (en) | Electroluminescent light source | |
| US20040046495A1 (en) | Organic electroluminescent device and method for manufacturing the same | |
| KR102378408B1 (en) | Organic electroluminescent device and organic electroluminescent device | |
| CN102110783A (en) | Low-voltage-driven hole injection layer serving as OLED device of luminescence adjustment layer | |
| US10355053B2 (en) | Organic light-emitting diode, display panel and display device | |
| CN111092163B (en) | Organic light emitting diode display device | |
| CN106784358A (en) | A kind of white light organic electroluminescent device | |
| CN103956432A (en) | Light emitting diode and electronic device | |
| US11011719B2 (en) | Electroluminescence device, lighting panel, and vehicle lamp group | |
| CN109473561A (en) | Organic Light Emitting Diode and display panel | |
| KR20120027294A (en) | Electroluminescent device | |
| CN203674210U (en) | White light emitting device | |
| CN107591491A (en) | A kind of undoped white-light emitting layer series connection organic electroluminescence device and preparation method thereof | |
| CN100407437C (en) | White light organic luminous assembly | |
| KR102009804B1 (en) | Organic light emitting diode display device and method for manufacturing the same | |
| CN107546248A (en) | A kind of undoped white-light emitting layer series connection organic electroluminescence device | |
| CN102195003A (en) | Color-stability white light organic light emitting diode (OLED) device and manufacturing method thereof | |
| KR20230135554A (en) | Organic light emitting display device | |
| CN111725409A (en) | White light LED device and its making method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |