CN104362258A - Organic light-emitting device with long service life - Google Patents
Organic light-emitting device with long service life Download PDFInfo
- Publication number
- CN104362258A CN104362258A CN201410642410.6A CN201410642410A CN104362258A CN 104362258 A CN104362258 A CN 104362258A CN 201410642410 A CN201410642410 A CN 201410642410A CN 104362258 A CN104362258 A CN 104362258A
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- luminescent device
- organic luminescent
- voltage
- long
- direct impulse
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2102/00—Constructional details relating to the organic devices covered by this subclass
- H10K2102/301—Details of OLEDs
- H10K2102/302—Details of OLEDs of OLED structures
Abstract
The invention discloses an organic light-emitting device with long service life. The organic light-emitting device comprises a first electrode, a second electrode and an organic light-emitting element containing a phosphorescent light emitting layer or a delayed fluorescence light emitting layer between the first electrode and the second electrode. The organic light-emitting device further comprises a pulse alternating-current drive circuit driven by forward pulse voltage V1 or forward pulse current I1 so that the organic light-emitting element can emit light. The pulse alternating-current drive circuit applies inverse pulse transient pulse voltage V2 reverse to the forward pulse voltage V1 or the forward pulse current I1 after applying the forward pulse voltage V1 or the forward pulse current I1. The application control time of the inverse pulse transient pulse voltage V2 in each cycle is less than or equal to 10 micro seconds. According to the organic light-emitting device with long service life, the service life of a screen of the organic light-emitting device is effectively prolonged on the condition that stroboflash is reduced.
Description
Technical field
The present invention relates to one and there is long-life organic luminescent device.
Background technology
For organic luminescent device (being called for short OLED), adopting pulsed drive, can extend the screen body running life-span of organic luminescent device, is suppress the gathering of electric charge at interface by directional current on the one hand.Such as, mention in patent CN 02815610.2, adopt and apply reverse low voltage pulse, can accumulation be eliminated, improve the life-span.But OLED is applied to lighting field, forward and reverse pulse voltage, can cause the screen body brightness of organic luminescent device afterpulsing driving to change.Adopt pulse voltage or pulse current as shown in Figure 1 to drive, thus the brightness of screen body also produce pulse change, finally causes the problem of stroboscopic to occur.
Summary of the invention
Organic luminescent device can be applied to illumination or display two fields.When being especially applied to lighting field, we wish that device sends the light of brightness stability, do not wish brightness instantaneous power change in time, produce stroboscopic, cause human eye accommodation system to follow change, and then cause visual fatigue, damage human eye.For problems of the prior art, technical problem to be solved by this invention is to provide one and has long-life organic luminescent device, at solution luminescent screen body without under the technical problem of stroboscopic, effectively improves the screen body running life-span of organic luminescent device.
The invention provides one and there is long-life organic luminescent device, comprise the first electrode, the second electrode and be in the organic illuminating element therebetween containing phosphorescence luminescent layer or delayed fluorescence luminescent layer, also comprise with direct impulse voltage V
1or direct impulse electric current I
1drive with the pulse ac drive circuit making described organic illuminating element luminescence, described pulse ac drive circuit is at applying direct impulse voltage V
1or direct impulse electric current I
1afterwards, also apply and described direct impulse voltage V
1or direct impulse electric current I
1contrary reverse transient pulse voltage V
2.
Further, described reverse transient pulse voltage V
2the applying control time within each cycle is less than or equal to 10 μ s.
Further, described reverse transient pulse voltage V
2the applying control time within each cycle is less than or equal to 1 μ s.
Further, described reverse transient pulse voltage V
2the applying control time within each cycle is less than or equal to 200ns.
Further, described reverse transient pulse voltage V
2the applying control time within each cycle is less than or equal to 100ns.
Further, described reverse transient pulse voltage V
2be greater than direct impulse voltage V
1.
Further, V
2>=1.5V
1.
Further, described direct impulse voltage V
1or direct impulse electric current I
1the applying control time within each cycle is 100ns ~ 1hours.
Further, described direct impulse voltage V
1or direct impulse electric current I
1the applying control time within each cycle is 10 μ s ~ 10min.
Further, described organic luminescent device be adopt the organic luminescent device of full phosphorescence luminous organic material, the organic luminescent device of organic luminescent device that fluorescence adds phosphorescent organic material or delayed fluorescence class luminous organic material.
The advantage that the present invention has is:
The invention provides one and there is long-life organic luminescent device, by controlling the time of reverse transient pulse voltage V2, utilize the light delay of phosphorescence or delayed fluorescence to reduce brightness change, the brightness of screen body can be made substantially to remain unchanged, efficiently solve the stroboscopic problem of screen body, also effectively improve the screen body running life-span of organic luminescent device simultaneously.Utilize the technological means applying reverse voltage (especially reverse voltage is greater than forward voltage) in the present invention, not only can eliminate the gathering of electric charge at interface, and instantaneous reverse impulse, the effect of repairing screen volume defect can be played.The present invention is simultaneously by the design in device drive cycle, although make this organic luminescent device drive under pulse voltage, large change does not occur in brightness, kept stable state.
Accompanying drawing explanation
Fig. 1 is that employing general pulse drives the screen body brightness change schematic diagram produced;
Fig. 2 is the change in voltage schematic diagram that the present invention adopts direct impulse voltage and the driving of reverse impulse instantaneous voltage;
Fig. 3 is the curent change schematic diagram that the present invention adopts direct impulse electric current and the driving of reverse impulse transient current;
Fig. 4 is the screen body brightness change schematic diagram adopting reverse impulse to drive in the present invention;
Fig. 5 is the screen body brightness contrast figure of the present invention and prior art.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described, can better understand the present invention and can be implemented, but illustrated embodiment is not as a limitation of the invention to make those skilled in the art.
The invention provides one and there is long-life organic luminescent device, adopt reverse transient pulse AC driving circuit, realize without stroboscopic, long-life organic luminescent device.The invention provides one and there is long-life organic luminescent device, comprise the first electrode, the second electrode and be in the organic illuminating element therebetween containing phosphorescence luminescent layer or delayed fluorescence luminescent layer, as shown in Figures 2 and 3, described pulse ac drive circuit is at applying direct impulse voltage V
1or direct impulse electric current I
1afterwards, apply and direct impulse voltage V
1or direct impulse electric current I
1contrary reverse transient pulse voltage V
2, as shown in Figures 2 and 3, oppositely only apply reverse transient pulse voltage V
2just passable, because do not have defective screen body, reverse current is zero, and for defective screen body, carries out reverse impact, and instantaneous reverse current can cause defect being burnt for short circuit, reverse instant pulse current I
2be 0.The present invention is by controlling reverse transient pulse voltage V
2time, utilize the light delay of phosphorescence to reduce brightness change, the brightness of screen body can be made substantially to remain unchanged.
Reverse transient pulse voltage V described in the present invention
2the applying control time within each cycle is less than or equal to 10 μ s, is more preferably less than or equal to 1 μ s.But the present invention obtains applying reverse transient pulse voltage V through great many of experiments
2the relation of cycle and screen body brightness, as Fig. 4, as can be seen from the figure, described reverse transient pulse voltage V
2applying cycle when being less than or equal to 200ns, the brightness of screen body can well be kept, and when being more preferably less than or equal to 100ns (as 10ns ~ 100ns) again, the effect of the brightness of screen body is optimum.In addition, the present invention is for described direct impulse voltage V
1or direct impulse electric current I
1the applying control time within each cycle be not specifically limited, be generally 0.1s ~ 1min, can more preferably 10 μ s ~ 10min.As shown in Figure 5, compare not adopting the screen body brightness of both organic luminescent devices of technical solution of the present invention in organic luminescent device provided by the invention and prior art, the present invention when realizing without stroboscopic, can effectively improve the screen body running life-span of organic luminescent device.
Described reverse transient pulse voltage V
2be greater than direct impulse voltage, preferably, V
2>=1.5V
1.
The present invention's OLED used can be the monochrome devices such as red, green, blue, Huang, also can for the white light OLED device be mixed to get.Its luminescent material can be full phosphorescent light-emitting materials, and also can be fluorescence and to phosphorate the luminescence of photoreactivation, also can be delayed fluorescence class luminescent material.
Embodiment 1: the white organic light emitting device of fluorescence and phosphorescence compound
A kind of preferred structure of the organic luminescent device of the present embodiment has following structural formula (1):
Glass/ITO/NPB(40nm)/AND:3％TBPe(30nm)/CBP:100％TCTA(10nm)/CBP:10％Ir(ppy)
3:2％Ir(mdq)
2acac/Bphen(30nm)/Al(150nm) (1)
According to structure above (1), the preparation process detailed embodiment in conjunction with organic luminescent device is described below:
The ultrasonic detergent of heat and the ultrasonic method of deionized water is utilized to clean transparent conduction base sheet ito glass, dry under placing it in infrared lamp after cleaning, then the ito glass of drying is carried out to the preliminary treatment of UV ozone cleaning and the bombardment of low energy oxygen ion beam, ito film wherein above conductive substrate is as the anode layer of device, the square resistance of ito film is 5 Ω ~ 100 Ω, thickness is 150nm, and effective light-emitting zone is 3mm × 3mm;
Above-mentioned cleaning, drying is placed in vacuum chamber through pretreated ito glass, is evacuated to 1 × 10
- 5~ 9 × 10
-3pa, then evaporation one deck hole mobile material NPB in above-mentioned ito film, the evaporation rate of material film is 0.01 ~ 0.5nm/s, and thickness is 40nm;
Keep above-mentioned vacuum chamber internal pressure constant, above-mentioned hole transmission layer continues evaporation organic luminous layer 1, adopt AND as main body, blue fluorescent material TBPe is as dyestuff, and doping content is 3wt ﹪, and light emitting layer thickness is 30nm;
On luminescent layer, evaporation exciton barrier-layer CBP:TCTA, doping ratio 100%, gross thickness 10nm;
Keep above-mentioned vacuum chamber internal pressure constant, above-mentioned hole transmission layer continues evaporation organic luminous layer 2, adopt the method for three source evaporations to adulterate, respectively by material of main part CBP, green phosphorescent dye Ir (ppy)
3, red phosphorescent dye Ir (mdq)
2acac is placed in different evaporation sources, monitor with the evaporation rate of three film thickness monitoring instrument probes to three evaporation sources respectively at evaporation simultaneously, by controlling the evaporation rate of three evaporation sources, phosphorescent coloring, the fluorescent dye doping content in material of main part is made to meet technological requirement.The doping content of green phosphorescent dye is 10wt ﹪, and the doping content of red phosphorescent dye is 2wt%.Total film thickness is 30nm;
Keep above-mentioned vacuum chamber internal pressure constant, continue evaporation one deck electron transfer layer Bphen on above-mentioned organic luminous layer, the evaporation rate of material film is 0.01 ~ 0.5nm/s, and thickness is 30nm;
Keep above-mentioned vacuum chamber internal pressure constant, on above-mentioned electron transfer layer, evaporation layer of lithium fluoride and metallic aluminum are the cathode layer of device successively.
Above-mentioned organic luminescent device is adopted respectively constant current and exchange and drive, wherein reverse impulse time 80ns, reverse impulse instantaneous voltage V
2for 12V, test brightness and life-span, as shown in table 1, when finding to apply reverse impulse instantaneous voltage without sudden strain of a muscle frequently, there is not larger change in brightness, the life-span is long.
Embodiment 2: the lamination white organic light emitting device of fluorescence and phosphorescence compound
Preparation technology of the present invention is with embodiment 1, but this organic luminescent device adopts lamination white light structure, and its structure is as follows:
Glass/ITO/NPB(40m)/AND:3％TBPe(30nm)/Bphen:2％li
3N/HIL:4％F
4TCNQ(30nm)/NPB(40nm)/CBP:100％TCTA(10nm)/CBP:10％Ir(ppy)
3:2％Ir(mdq)
2acac/Bphen(30nm)/Al(150nm) (2)
Above-mentioned organic luminescent device is adopted respectively constant current and exchange and drive, wherein the reverse impulse time is 60ns, reverse impulse instantaneous voltage V
2for 17V, test brightness and life-span, as shown in table 1, when finding to apply reverse impulse instantaneous voltage without sudden strain of a muscle frequently, there is not larger change in brightness, the life-span is long.
Embodiment 3: the lamination white organic light emitting device of fluorescence and phosphorescence compound
Preparation technology of the present invention is with embodiment 1, but organic luminescent device adopts lamination full phosphorescence white light structure, and its structure is as follows:
Glass/ITO/NPB(40m)/CBP:3％Firpic(30nm)/Bphen:2％li
3N/HIL:4％F
4TCNQ(30nm)/NPB(40nm)/CBP:100％TCTA(10nm)/CBP:10％Ir(ppy)
3:2％Ir(mdq)
2acac/Bphen(30nm)/Al(150nm) (3)
Above-mentioned organic luminescent device is adopted respectively constant current and exchange and drive, wherein the reverse impulse time is 100ns, reverse impulse instantaneous voltage V
2for 20V, test brightness and life-span, as shown in table 1, when finding to apply reverse impulse instantaneous voltage without sudden strain of a muscle frequently, there is not larger change in brightness, the life-span is long.
Table 1: the brightness of each embodiment and life experimental data table
Can find out and adopt pulsed drive device, corresponding longer working life.And screen body is examined under a microscope, adopt high voltage reverse impulse type of drive, screen body latent defect, can be eliminated by pulse current.Cardinal principle is, under reverse impulse, and normal screen body current cut-off, but there is the position of circuit defect, instantaneous concentrated larger current, therefore punctures defect point as off state.Simultaneously because device is phosphorescence or delayed fluorescence material, transient lifetime is long, when restriction reverse impulse one comparatively the minor cycle time, although instantaneous reverse impulse.But there is delay in the brightness of screen body, brightness only slightly decays.Even if therefore under pulsed drive, also can obtain the lighting source not having obvious stroboscopic, and then the long-life can be obtained, without stroboscopic OLED screen body.
The above embodiment is only that protection scope of the present invention is not limited thereto in order to absolutely prove the preferred embodiment that the present invention lifts.The equivalent alternative or conversion that those skilled in the art do on basis of the present invention, all within protection scope of the present invention.Protection scope of the present invention is as the criterion with claims.
Claims (10)
1. there is a long-life organic luminescent device, comprise the first electrode, the second electrode and be in the organic illuminating element therebetween containing phosphorescence luminescent layer or delayed fluorescence luminescent layer, also comprise with direct impulse voltage V
1or direct impulse electric current I
1drive with the pulse ac drive circuit making described organic illuminating element luminescence, it is characterized in that, described pulse ac drive circuit is at applying direct impulse voltage V
1or direct impulse electric current I
1afterwards, also apply and described direct impulse voltage V
1or direct impulse electric current I
1contrary reverse transient pulse voltage V
2.
2. according to claim 1 have long-life organic luminescent device, it is characterized in that, described reverse transient pulse voltage V
2the applying control time within each cycle is less than or equal to 10 μ s.
3. according to claim 2 have long-life organic luminescent device, it is characterized in that, described reverse transient pulse voltage V
2the applying control time within each cycle is less than or equal to 1 μ s.
4. according to claim 3 have long-life organic luminescent device, it is characterized in that, described reverse transient pulse voltage V
2the applying control time within each cycle is less than or equal to 200ns.
5. according to claim 4 have long-life organic luminescent device, it is characterized in that, described reverse transient pulse voltage V
2the applying control time within each cycle is less than or equal to 100ns.
6. as claimed in any of claims 1 to 5 have long-life organic luminescent device, it is characterized in that, described reverse transient pulse voltage V
2be greater than direct impulse voltage V
1.
7. according to claim 6 have long-life organic luminescent device, it is characterized in that, V
2>=1.5V
1.
8. according to claim 6 have long-life organic luminescent device, it is characterized in that, described direct impulse voltage V
1or direct impulse electric current I
1the applying control time within each cycle is 100ns ~ 1hours.
9. according to claim 8 have long-life organic luminescent device, it is characterized in that, described direct impulse voltage V
1or direct impulse electric current I
1the applying control time within each cycle is 10 μ s ~ 10min.
10. according to claim 6 have long-life organic luminescent device, it is characterized in that, described organic luminescent device be adopt the organic luminescent device of full phosphorescence luminous organic material, the organic luminescent device of organic luminescent device that fluorescence adds phosphorescent organic material or delayed fluorescence class luminous organic material.
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| CN201410642410.6A CN104362258B (en) | 2014-11-07 | 2014-11-07 | Organic light-emitting device with long service life |
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| CN201410642410.6A CN104362258B (en) | 2014-11-07 | 2014-11-07 | Organic light-emitting device with long service life |
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| CN104362258B CN104362258B (en) | 2017-03-22 |
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| CN108932926A (en) * | 2017-05-23 | 2018-12-04 | Tcl集团股份有限公司 | A kind of QLED device and its reversed driven mode |
| CN108934098A (en) * | 2017-05-23 | 2018-12-04 | Tcl集团股份有限公司 | A kind of QLED driving method based on oblique wave |
| CN108932925A (en) * | 2017-05-23 | 2018-12-04 | Tcl集团股份有限公司 | A kind of QLED driving method based on sine wave |
| CN108932928A (en) * | 2017-05-23 | 2018-12-04 | Tcl集团股份有限公司 | A kind of driving method of passive type driving quantum dot display panel |
| CN108934097A (en) * | 2017-05-23 | 2018-12-04 | Tcl集团股份有限公司 | A kind of QLED driving method based on electromagnetic wave |
| CN108962133A (en) * | 2017-05-23 | 2018-12-07 | Tcl集团股份有限公司 | A kind of QLED device and its reverse current drive mode |
| CN108962128A (en) * | 2017-05-23 | 2018-12-07 | Tcl集团股份有限公司 | A kind of QLED driving method based on square wave |
| CN108962130A (en) * | 2017-05-23 | 2018-12-07 | Tcl集团股份有限公司 | It is a kind of to be driven in the reverse direction method applied to default in video display process |
| CN109064968A (en) * | 2017-05-23 | 2018-12-21 | Tcl集团股份有限公司 | A kind of driving method of active driving quantum dot display panel |
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| CN108934098A (en) * | 2017-05-23 | 2018-12-04 | Tcl集团股份有限公司 | A kind of QLED driving method based on oblique wave |
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| CN109064968A (en) * | 2017-05-23 | 2018-12-21 | Tcl集团股份有限公司 | A kind of driving method of active driving quantum dot display panel |
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| CN108934098B (en) * | 2017-05-23 | 2021-08-10 | Tcl科技集团股份有限公司 | QLED driving method based on oblique wave |
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