Organic light-emitting device with long service life

An organic light-emitting device, long-life technology, applied in the direction of organic light-emitting device, organic light-emitting device structure, electric solid device, etc. Repair screen defects, solve stroboscopic problems, long life effect

Active Publication Date: 2015-02-18
BEIJING VISIONOX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, OLED is used in the field of lighting, and the forward and reverse pulse voltage will cause the brightness of the screen of the organic light-emitting device to change following the

Method used

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  • Organic light-emitting device with long service life
  • Organic light-emitting device with long service life
  • Organic light-emitting device with long service life

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Fluorescence and phosphorescence composite white light organic light-emitting device

[0027] A preferred structure of the organic light-emitting device of this embodiment has the following structural formula (1):

[0028] Glass / ITO / NPB(40nm) / AND:3%TBPe(30nm) / CBP:100%TCTA(10nm) / CBP:10%Ir(ppy) 3 :2%Ir(mdq) 2 acac / Bphen(30nm) / Al(150nm) (1)

[0029] According to the above structural formula (1), the detailed implementation in combination with the preparation steps of the organic light-emitting device is described as follows:

[0030] Use hot detergent ultrasonic and deionized water ultrasonic method to clean the transparent conductive substrate ITO glass, after cleaning, place it under the infrared lamp for drying, and then clean the dried ITO glass with ultraviolet ozone and low-energy oxygen ions Beam bombardment pretreatment, in which the ITO film on the conductive substrate is used as the anode layer of the device, the square resistance of the ITO film is...

Embodiment 2

[0038] Example 2: Fluorescent and phosphorescent composite stacked white organic light-emitting device

[0039] The preparation process of the present invention is the same as in Example 1, but the organic light-emitting device adopts a laminated white light structure, and its structure is as follows:

[0040] Glass / ITO / NPB(40m) / AND:3%TBPe(30nm) / Bphen:2%li 3 N / HIL: 4% F 4 TCNQ(30nm) / NPB(40nm) / CBP:100%TCTA(10nm) / CBP:10%Ir(ppy) 3 :2%Ir(mdq) 2 acac / Bphen(30nm) / Al(150nm) (2)

[0041] The above-mentioned organic light-emitting devices are respectively driven by constant current and AC, wherein the reverse pulse time is 60 ns, and the reverse pulse instantaneous voltage V 2 It is 17V, and the brightness and life are tested. As shown in Table 1, it is found that there is no flicker frequency when the reverse pulse instantaneous voltage is applied, the brightness does not change greatly, and the life is long.

Embodiment 3

[0042] Example 3: Fluorescence and phosphorescence composite stacked white organic light-emitting device

[0043] The preparation process of the present invention is the same as in Example 1, but the organic light-emitting device adopts a laminated all-phosphorescent white light structure, and its structure is as follows:

[0044] Glass / ITO / NPB(40m) / CBP:3%Firpic(30nm) / Bphen:2%li 3 N / HIL: 4% F 4 TCNQ(30nm) / NPB(40nm) / CBP:100%TCTA(10nm) / CBP:10%Ir(ppy) 3 :2%Ir(mdq) 2 acac / Bphen(30nm) / Al(150nm) (3)

[0045] The above-mentioned organic light-emitting devices are respectively driven by constant current and AC, wherein the reverse pulse time is 100 ns, and the reverse pulse instantaneous voltage V 2 It is 20V, and the brightness and life are tested. As shown in Table 1, it is found that there is no flicker frequency when the reverse pulse instantaneous voltage is applied, the brightness does not change greatly, and the life is long.

[0046] Table 1: Brightness and life experimen...

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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 [0001] The present invention relates to an organic light-emitting device with a long lifetime. Background technique [0002] For organic light-emitting devices (referred to as OLED), the use of pulse driving can prolong the working life of the screen of organic light-emitting devices. On the one hand, the accumulation of charges at the interface is suppressed by directional current. For example, it is mentioned in the patent CN 02815610.2 that by applying reverse low voltage pulses, charge accumulation can be eliminated and the lifetime can be improved. However, when OLEDs are used in the lighting field, forward and reverse pulse voltages will cause the brightness of the screen of the organic light-emitting device to change following the pulse drive. use as figure 1 Driven by the pulse voltage or pulse current shown, the brightness of the screen also produces pulse changes, which eventually causes the problem of stroboscopic flicker. Contents of the inven...

Claims

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Application Information

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IPC IPC(8): H01L51/52H01L51/50
CPCH10K50/00H10K50/80H10K2102/302
Inventor 段炼张国辉吴海燕李曼王静董艳波胡永岚
Owner BEIJING VISIONOX TECH
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