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An organic electroluminescent device

An electroluminescent device and luminescent technology, which is applied in the direction of organic semiconductor devices, electric solid devices, luminescent materials, etc., can solve problems that affect the luminous efficiency of organic electroluminescent devices and cannot guarantee the carrier transport capacity of the transport layer , to achieve low cost of use, reduce total reflection, and improve coupling efficiency

Active Publication Date: 2020-09-01
KUNSHAN GO VISIONOX OPTO ELECTRONICS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the problem that the organic electroluminescent device in the prior art cannot guarantee the carrier transport capability of the transport layer while improving the light outcoupling efficiency, thereby affecting the performance of the organic electroluminescent device. Luminous Efficiency Defects

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  • An organic electroluminescent device
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  • An organic electroluminescent device

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Embodiment 1

[0051] The invention provides an organic electroluminescence device, comprising a carrier transport layer, the carrier transport layer is a hole transport layer, including a hole transport material and an inert material doped in the hole transport material, The doping ratio of the inert material is 30wt%.

[0052] The structure of the inert material is as shown in formula I-1, n is 26, and the refractive index is 1.35.

[0053]

[0054] The hole transport material is N,N'-di(1-naphthyl)-N,N'-diphenyl-1,1'-biphenyl-4,4'-diamine (abbreviation: NPB). The molecular structure is shown in formula III-1:

[0055]

[0056] The preparation method of the carrier transport layer is as follows: the above-mentioned NPB and the inert material shown in the formula I-1 are subjected to vacuum doping evaporation at a mass ratio of 7:3 to form the carrier transport layer. Wherein, the evaporation condition of the inert material shown in formula I-1 is: 5*10 - 4 Under Pa vacuum degree,...

Embodiment 2

[0059] The invention provides an organic electroluminescent device, comprising a carrier transport layer, the carrier transport layer is an electron transport layer, including an electron transport material and an inert material doped in the electron transport material, the inert material The doping ratio was 20 wt%.

[0060] The selected inert material has a structure as shown in formula I-2, n is 10, and the refractive index is 1.3.

[0061]

[0062] The electron transport material is 4,7-diphenyl-1,10-phenanthroline (abbreviation: Bphen), and its molecular structure is shown in formula II-1:

[0063]

[0064] The preparation method of the carrier transport layer is as follows: the above-mentioned Bphen and the inert material shown in the formula I-2 are subjected to vacuum doping evaporation at a mass ratio of 8:2 to form the carrier transport layer. Among them, the inert material evaporation conditions shown in I-2 are: at 5*10 -4 Under Pa vacuum degree, the evapor...

Embodiment 3

[0067] The invention provides an organic electroluminescence device, comprising a carrier transport layer, the carrier transport layer is a hole transport layer, including a hole transport material and an inert material doped in the hole transport material, The doping ratio of the inert material is 60wt%.

[0068] The structure of the inert material is as shown in formula I-3, n is 30, and the refractive index is 1.36.

[0069]

[0070] The hole transport material is 4,4'-cyclohexylbis[N,N-bis(4-methylphenyl)]aniline (abbreviation: TAPC), and its molecular structure is shown in formula III-3:

[0071]

[0072] The preparation method of the carrier transport layer is as follows: the above-mentioned TAPC and the inert material shown in the formula I-3 are subjected to vacuum doping evaporation at a mass ratio of 4:6 to form the carrier transport layer. Wherein, the evaporation condition of the inert material shown in formula I-3 is: at 5*10 -4 Under Pa vacuum degree, the...

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Abstract

The invention discloses an organic electroluminescent device, which comprises a carrier transport layer, the carrier transport layer includes an electron transport layer and / or a hole transport layer, and the at least one layer structure of the carrier transport layer is Doping with an inert material, the refractive index of the inert material is <1.5. By doping inert materials with low refractive index, the refractive index of the light extraction and transmission layer can be effectively reduced, thereby reducing the light loss of photons emitted by the light-emitting layer due to ITO / organic waveguide mode and / or surface plasmon mode, making organic electroluminescence The device has high light output coupling efficiency; at the same time, the incorporation of inert materials enhances the injection of carriers in the electroluminescence device, which is beneficial to improving the carrier transport performance of the transport layer. The organic electroluminescence device has high external quantum efficiency and light output efficiency, and is beneficial to the efficient use of the device.

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] In the current flat-panel display technology, organic light-emitting diodes (OLEDs, Organic Light Emitting Diods) are the development of the next generation of display and lighting due to their advantages such as wide viewing angle, ultra-thin, fast response, high luminous efficiency, and flexible display. The trend has become one of the most promising display technologies. [0003] Recently, OLED devices have made positive progress in improving the luminous efficiency of the device. The application of phosphorescent materials has increased the internal quantum efficiency of organic electrophosphorescent devices from 25% to nearly 100%; thermally activated delayed fluorescence (TADF) materials can simultaneously Combining the advantages of fluorescent and phosphorescent materials, 100% internal quan...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/52H01L51/56
CPCH10K71/164H10K50/858C09K11/06H10K50/155H10K50/165H10K85/60H10K85/631H10K85/633H10K85/6572H10K85/626H10K2102/351
Inventor 段炼魏鹏程李国孟
Owner KUNSHAN GO VISIONOX OPTO ELECTRONICS CO LTD
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