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Organic light-emitting device

An electroluminescent device and electroluminescent technology, applied in the direction of electric solid devices, electrical components, semiconductor devices, etc., can solve the problems of efficiency quenching, low efficiency of fluorescent electroluminescent devices, etc., so as to reduce the roll-off of device efficiency and improve the Exciton utilization, reducing triplet-triplet annihilation effect

Inactive Publication Date: 2019-07-09
KUNSHAN GO VISIONOX OPTO ELECTRONICS CO LTD +1
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Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the severe triplet-triplet annihilation (TTA) and triplet-polaron annihilation (TPA) when the current thermally activated delayed fluorescent material is used as the main body, resulting in fluorescent electroluminescence The problem of low device efficiency and serious efficiency quenching

Method used

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Examples

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Embodiment 1

[0055] This embodiment provides an organic electroluminescent device, such as figure 2 As shown, there are a first electrode 1 , a second electrode 2 and an organic functional layer 3 between the first electrode 1 and the second electrode 2 . The first electrode 1 is an anode, the second electrode 2 is a cathode, and the organic functional layer 3 includes a hole transport layer 31, an electron blocking layer 32, a light emitting layer 33, an electron transport layer 34, and an electron injection layer 35 that are stacked. The structure of the electroluminescent device is: anode / hole transport layer / hole blocking layer / light emitting layer / electron transport layer / electron injection layer / cathode.

[0056] The light emitting layer 33 is composed of a host material and a dopant material doped in the host material. The host material includes an aggregation-induced delayed fluorescent material, and the doping material is a fluorescent doping dye. Among them, the molecular skel...

Embodiment 2

[0080] The difference between this example and Example 1 lies in that the molecules of the aggregation-induced delayed fluorescent material have the structure shown in formula (A-31), and the fluorescent dopant material is a (blue) fluorescent dopant material (F-22). Wherein, the doping concentration of the blue fluorescent dopant material (F-22) is 10wt%. Device at 5000cd / m 2 Under brightness, the external quantum efficiency is 11.5%.

Embodiment 3

[0082] The difference between this example and Example 1 lies in that the molecules of the aggregation-induced delay fluorescent material have the structure shown in formula (A-3), and the fluorescent dopant material is a green fluorescent dopant material (F-12). Wherein, the doping concentration of the green fluorescent doping material (F-12) is 30wt%. Device at 5000cd / m 2 Under brightness, the external quantum efficiency is 17.1%.

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Abstract

The invention belongs to the technical field of display, and particularly discloses an organic light-emitting device. The organic light-emitting device comprises a light-emitting layer, the light-emitting layer comprises a main body material and a fluorescent doping material, the main body material employs a gathering induction delay fluorescent material, the molecule has a relatively large torsion angle under a gathering state, the distance among molecules is expanded, and the mutual effect among the molecules is reduced; meanwhile, excitons are mainly distributed on a molecule core under a simulation state of the gathering induction delay fluorescent material, triplet-triplet annihilation and triplet-polaron quenching of an excited state of main body molecules under a gathering state canbe effectively reduced, the efficiency roll-off of the device is reduced; and moreover, rotation-vibration of the gathering induction delay fluorescent material in the molecules under gathering is limited, the non-radiation relaxation energy loss of the main body in the device can be effectively reduced, so that the light-emitting efficiency of the device is improved.

Description

technical field [0001] The invention belongs to the field of display technology, and in particular relates to an organic electroluminescent device. Background technique [0002] Organic light-emitting diodes (OLEDs) have great application prospects in the fields of display and lighting due to their ultra-thin, light weight, low energy consumption, active light emission, wide viewing angle, and fast response. more and more people's attention. [0003] In 1987, Deng Qingyun (C.W.Tang) and Vanslyke of Eastman Kodak Company in the United States reported for the first time the use of transparent conductive films as anodes, Alq 3 As a light-emitting layer, a triarylamine material as a hole-transporting layer, and a Mg / Ag alloy as a cathode, a double-layer organic electroluminescent device is made. Traditional fluorescent materials are easy to synthesize, stable, and have a long device life. However, due to electron spin prohibition, only 25% of the singlet excitons can be used t...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/54
CPCH10K50/121H10K50/12H10K50/11H10K2101/10
Inventor 段炼宋晓增张东东李国孟
Owner KUNSHAN GO VISIONOX OPTO ELECTRONICS CO LTD
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