CN102222776B - White-light organic light emitting device with graded junction light emitting layer structure and preparation method of white-light organic light emitting device - Google Patents
White-light organic light emitting device with graded junction light emitting layer structure and preparation method of white-light organic light emitting device Download PDFInfo
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Abstract
The invention relates to a white-light organic light emitting device with a graded junction light emitting layer structure and a preparation method of the white-light organic light emitting device. The device sequentially consists of an indium tin oxide (ITO) glass base plate (1), a hole injection layer (2), a hole transmission layer (3), a graded junction light emitting layer (4), an electronic transmission layer (5), and a composite cathode (6). Each structural layer is prepared by a vacuum evaporation method. In the invention, the light emitting layer of the white-light organic light emitting device adopts the graded junction structure, which is DPVBi: BCzVB: X%DCJTB/DPVBi: BCzVB: Y%DCJTB, in which X is less than Y. By application of the structure, the efficiency, brightness and collar stability of the fluorescent white-light organic light emitting device are greatly improved; the quenching effect under high drive current is effectively inhibited; and the device is more stable in performance. The invention has the advantages of simple process, low cost, easy industrialization and the like; and the white-light organic light emitting device is widely applied in organic light emitting display.
Description
Technical field
The present invention relates to a kind of white light organic electroluminescent device with progressive junction luminous layer structure and preparation method thereof, the luminescent layer of device adopts progressive junction, its structure is DPVBi:BCzVB:X % DCJTB/DPVBi:BCzVB:Y % DCJTB, wherein X＜Y.This white light organic electroluminescent device with progressive junction luminous layer structure has greatly improved efficient, brightness and the color stability of device, and the quenching effect of suppression device effectively, has strengthened the stability of device.It is simple that the present invention has technique, with low cost, is easy to the plurality of advantages such as industrialization, can be widely used in flat panel display and solid-state illumination.
Background technology
Organic electroluminescence device (Organic Light Emitting Device, OLED) has high-luminous-efficiency, low driving voltage, rich color, technique is simple, and flexible structure is easy to the large tracts of land preparation, the excellent properties such as antidetonation resistance to compression become flat panel display and the solid-state illumination technology of the tool development prospect of a new generation.
No matter be that the white light OLED technology is all most important for flat panel display or illumination.White light OLED will be applied, and must solve efficient, colour-stable, quenching effect and Cost Problems.The present Main Problems of white light OLED mainly concentrates on:
(1) quenching effect.Quenching effect is the unavoidable problem that the OLED device faces, and this meeting is so that the luminous efficiency of device reduces very fast under high current density.
(2) color stability.Owing to the exciton center can drift about along with current density, the white light OLED that preparation has stable chromaticity coordinates is a major issue that needs to be resolved hurrily.
(3) high efficiency fluorescent OLED device.Although phosphor material has higher efficient and good electric property.But the price of phosphor material is higher, generally be fluorescent material 3-5 doubly about, it is found that simultaneously and the phosphor material that synthesizes less, be difficult to satisfy the needs of flat panel display industrial development.Thereby people are devoted to develop the method that fluorescence white light OLED device performance is improved always.
Summary of the invention
The object of the invention is to solve the problem that prior art exists, a kind of method that improves efficient, brightness and the color stability of fluorescence white light organic electroluminescent device is provided.
For achieving the above object, the present invention adopts following technical proposals:
A kind of white light organic electroluminescent device with progressive junction luminous layer structure is characterized in that ito glass substrate (1), hole injection layer (2), hole transmission layer (3), progressive junction luminescent layer (4), electron transfer layer (5) and composite cathode (6).
Above-mentioned hole injection layer (2) material therefor is MoO
x, among m-MTDATA, F4-TCNQ, the CuPc any one.
Above-mentioned hole transmission layer (3) is NPB.
The structure that above-mentioned progressive junction luminescent layer (4) adopts is DPVBi:BCzVB:X % DCJTB/DPVBi:BCzVB:Y % DCJTB, wherein X＜Y.
Above-mentioned electron transfer layer (5) material therefor is Alq
3, among Bphen, BCP, the PDB any one.
Above-mentioned composite cathode (6) is LiF/Al, CsO
xAmong/Al, the Mg-Ag any one.
According to purpose of the present invention, the preparation method of above-mentioned organic electroluminescence device is successively evaporation hole injection layer (2), hole transmission layer (3), progressive junction luminescent layer (4), electron transfer layer (5) and composite cathode (6) on ito glass substrate (1).
The processing step of above-mentioned manufacture method is as follows:
A. select the to meet the requirements ito glass substrate (1) of size and sheet resistance cleans post-drying, and processes with UV-Ozone;
B. adopt the method for vacuum evaporation, at the upper evaporation hole injection layer (2) of above-mentioned ito glass substrate (1);
C. adopt the method for vacuum evaporation, at the upper evaporation hole transmission layer (3) of above-mentioned hole injection layer (2);
D. adopt the method for vacuum evaporation, at the upper evaporation progressive junction luminescent layer (4) of above-mentioned hole transmission layer (3);
E. adopt the method for vacuum evaporation, at the upper evaporation electron transfer layer (5) of above-mentioned progressive junction luminescent layer (4);
F. adopt the method for vacuum evaporation, at the upper evaporation composite cathode (6) of above-mentioned electron transfer layer (5).
Above-mentioned organic compound, inorganic compound and metal all adopt the method for vacuum evaporation.
The present invention compared with prior art, have following apparent outstanding substantive distinguishing features and remarkable advantage: the present invention has adopted the structure of progressive junction in the luminescent layer of fluorescence white light organic electroluminescent device, reduce discontinuous between the luminescent layer interface, greatly improved efficient, brightness and the color stability of device.Simultaneously, establishment the quenching effect of device under high drive current so that device is more stable.The more important thing is: the present invention can effectively utilize existing equipment, has that technique is simple, cost is low, realize easily the plurality of advantages such as industrialization.
Description of drawings
Fig. 1 is the structure chart that the present invention has the white light organic electroluminescent device of progressive junction luminous layer structure.
Fig. 2 is 20 mA/cm
2Drive current under, the electroluminescent spectrum figure of device.
Fig. 3 is under the different driving electric current, the chromaticity coordinates change curve of device.
Fig. 4 is under the different driving electric current, the power efficiency change curve of device.
Fig. 5 is under the different driving electric current, the luminous efficiency change curve of device.
Embodiment
Further specify below in conjunction with accompanying drawing with to this example.
As shown in Figure 1, the white light organic electroluminescent device that has the progressive junction luminous layer structure in this example comprises ito glass substrate (1), hole injection layer (2), hole transmission layer (3), progressive junction luminescent layer (4), electron transfer layer (5) and composite cathode layer (6).
Preparation method's detailed step and the technique of organic electroluminescence device with this device architecture is as follows:
A. size (effective area 5 mm * 5 mm) and the sheet resistance (ito glass substrate (1) of 20 Ω/) of selecting to meet the requirements, ito glass cleans with cleanser first, use successively again acetone, absolute ethyl alcohol, deionized water ultrasonic cleaning 30 min, in baking oven, dry, after carrying out the UV-Ozone processing, put into vacuum evaporation apparatus;
B. 4 * 10
-4In the Pa vacuum environment, at the upper evaporation MoO of above-mentioned ito glass substrate (1)
xLayer is as hole injection layer (2), and wherein thickness is 4 nm;
C. upward evaporation NPB layer is as hole transmission layer (3) at above-mentioned hole injection layer (2), and its thickness is 50 nm;
D. upward evaporation [DPVBi:5 % BCzVB:X % DCJTB]/[DPVBi:5 % BCzVB:Y % DCJTB] is as progressive junction luminescent layer (4) at above-mentioned hole transmission layer (3), and wherein [DPVBi:5 % BCzVB:X % DCJTB] and [DPVBi:5 % BCzVB:Y % DCJTB] thickness is 15 nm; X=0.05, Y=0.15;
E. at the upper evaporating Al q of above-mentioned progressive junction luminescent layer (4)
3Layer is as electron transfer layer (5), and its thickness is 6 nm;
F. change the electrode mask plate, at the upper evaporation composite cathode (6) of above-mentioned electron transfer layer (5), first evaporation LiF, its thickness are 1 nm, evaporating Al electrode layer on the LiF layer again, and its thickness is 120 nm.
This example adopts the structure of progressive junction luminescent layer, has prepared high performance white light organic electroluminescent device.Fig. 2 is the electroluminescent spectrum of device, and as seen from the figure, device has very excellent colorimetric purity, and its chromaticity coordinates is (0.324,0.341).As shown in Figure 3, device has very excellent color stability.When its drive current density from 0 mA/cm
2Change to 200 mA/cm
2The time, the variation of chromaticity coordinates only is (0.000,0.001).As shown in Figure 4, the peak power efficient of device reaches 4.48 Lm/W.As shown in Figure 5, the highest luminous efficiency of device reaches 11.5 cd/A.For this device, when its drive current density from 0 mA/cm
2Change to 400 mA/cm
2The time, the luminous efficiency of device does not have obvious downward trend.Therefore, this progressive junction luminous layer structure can suppress the quenching effect of electric current effectively, and device performance is more stable.
Employing has white light organic electroluminescent device of progressive junction luminous layer structure and preparation method thereof and is than the sharpest edges of other conventional methods: the present invention can effectively utilize existing equipment, in the structure of luminescent layer employing progressive junction, greatly improved efficient, brightness and the color stability of device.Simultaneously, effectively suppressed the quenching effect under the high drive current, device performance is more stable.Above-mentioned device architecture and preparation method, it is simple to have technique, with low cost, is easy to the plurality of advantages such as industrialization, can be widely used in flat panel display and solid-state illumination.Those of ordinary skill in the art can be easy to these embodiments are made various modifications, and at the general application of principle of this explanation in other application example and needn't pass through performing creative labour.Therefore, the invention is not restricted to the embodiment here, those skilled in the art should be within protection scope of the present invention to improvement and modification that the present invention makes according to announcement of the present invention.
Claims (7)
1. the white light organic electroluminescent device that has the progressive junction luminous layer structure is characterized in that having comprised ito glass substrate (1), hole injection layer (2), hole transmission layer (3), progressive junction luminescent layer (4), electron transfer layer (5), composite cathode (6); Described progressive junction luminescent layer (4) is DPVBi:BCzVB:X % DCJTB/DPVBi:BCzVB:Y % DCJTB, wherein X＜Y.
2. the white light organic electroluminescent device with progressive junction luminous layer structure according to claim 1 is characterized in that: the structure that its hole injection layer (2) adopts is MoO
x, among m-MTDATA, F4-TCNQ, the CuPc any one.
3. the white light organic electroluminescent device with progressive junction luminous layer structure according to claim 1, it is characterized in that: its hole transmission layer (3) material is NPB.
4. the white light organic electroluminescent device with progressive junction luminous layer structure according to claim 1 is characterized in that: it is Alq that electron transfer layer (5) adopts material
3, among Bphen, BCP, the PDB any one.
5. the white light organic electroluminescent device with progressive junction luminous layer structure according to claim 1, it is characterized in that: composite cathode (6) is LiF/Al, CsO
xAmong/Al, the Mg-Ag any one.
6. the white light organic electroluminescent device with progressive junction luminous layer structure according to claim 1, it is characterized in that: described electron transfer layer (5) is Alq
3
7. be used for the preparation method with white light organic electroluminescent device of progressive junction luminous layer structure claimed in claim 1, it is characterized in that the operating procedure for preparing is as follows:
A. select the to meet the requirements ito glass substrate (1) of size and sheet resistance cleans post-drying;
B. adopt the method for vacuum evaporation, at the upper evaporation hole injection layer (2) of above-mentioned ito glass substrate (1);
C. adopt the method for vacuum evaporation, at the upper evaporation hole transmission layer (3) of above-mentioned hole injection layer (2);
D. adopt the method for vacuum evaporation, at the upper evaporation DPVBi:BCzVB:X % DCJTB of above-mentioned hole transmission layer (3)/DPVBi:BCzVB:Y % DCJTB, X＜Y wherein is as progressive junction luminescent layer (4);
E. adopt the method for vacuum evaporation, at the upper evaporation electron transfer layer (5) of above-mentioned progressive junction luminescent layer (4);
F. adopt the method for vacuum evaporation, at the upper evaporation composite cathode (6) of above-mentioned electron transfer layer (5).
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1921171A (en) * | 2006-09-14 | 2007-02-28 | 电子科技大学 | White light organic electroluminescent device |
| CN101924186A (en) * | 2009-06-17 | 2010-12-22 | 上海宏源照明电器有限公司 | White organic LED |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1921171A (en) * | 2006-09-14 | 2007-02-28 | 电子科技大学 | White light organic electroluminescent device |
| CN101924186A (en) * | 2009-06-17 | 2010-12-22 | 上海宏源照明电器有限公司 | White organic LED |
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