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Organic light-emitting device and preparation method thereof

An electroluminescent device and luminescence technology, which is applied in the direction of electric solid-state devices, semiconductor/solid-state device manufacturing, electrical components, etc., can solve the problems of high calorific value, affecting the light efficiency and life of the device, long diffusion distance, etc., and achieve improved Luminous efficiency, improved service life, good thermal stability

Inactive Publication Date: 2014-09-17
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also some problems, such as some P dopants, such as the general thermal stability of F4-TCNQ. During the use of the device, the doping structure itself is unstable, especially for the n-doped electron transport layer. Generally speaking, alkali metal compounds are usually used for doping, but the alkali metal ions are usually small in size, strong in diffusion ability, and have a long diffusion distance in the organic layer. In addition to being doped in the transport layer, alkali metal ions may also diffuse to In the light-emitting layer, it directly leads to the quenching of excitons, which affects the light efficiency and life of the device
[0004] At present, some researchers use organic materials such as Bphen as the blocking part to block the diffusion of electrons. However, the film quality of these organic materials is not good enough, and the blocking effect on ions is limited. In the long-term use of light-emitting devices, their calorific value is relatively high. For example, the glass transition temperature of commonly used Bphen is only 75°C, and its thermal stability is not good. In long-term use, it is easy to be damaged and affect its barrier performance. Affects the light efficiency and life of organic electroluminescent devices

Method used

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  • Organic light-emitting device and preparation method thereof
  • Organic light-emitting device and preparation method thereof
  • Organic light-emitting device and preparation method thereof

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preparation example Construction

[0053] Such as figure 2 Shown, the preparation method of the organic electroluminescent device of one embodiment, comprises the following steps:

[0054] Step S210: providing a substrate, and forming an anode layer on the substrate by sputtering.

[0055] Preferably, the sputtering method is magnetron sputtering.

[0056] Preferably, before forming the anode layer by sputtering on the substrate, a cleaning step of the substrate is also included: the substrate is placed in deionized water containing detergent, isopropanol and acetone for ultrasonic cleaning, and then dried. In a specific embodiment, the substrate is placed in isopropanol and acetone and cleaned by ultrasonic waves for 20 minutes respectively; the cleaned substrate is dried by nitrogen gas.

[0057] Step S220: sequentially vacuum-evaporating a hole transport layer, an electron blocking layer, and a light emitting layer on the anode layer.

[0058] Preferably, the vacuum degree during vacuum evaporation is 10...

Embodiment 1

[0067] The structure of the organic electroluminescent device of the present embodiment is: glass / ITO / F6-TNAP:MeO-TPD / TAPC / Ir(ppy) 3 :TCTA / BAlq / CsN 3 :Bphen / BAlq / CsN 3 :Bphen / Ag.

[0068] The preparation of the organic electroluminescent device of this embodiment is as follows:

[0069] (1) Form the ITO anode layer by sputtering on the glass substrate: place the glass substrate in deionized water containing detergent for ultrasonic cleaning. blow dry. Then, an ITO anode layer is formed on the glass surface by magnetron sputtering, and the thickness of the anode layer is 100 nanometers. The glass substrate formed with the ITO anode layer is placed in a plasma treatment chamber for plasma treatment.

[0070] (2) Vacuum evaporation on the ITO anode layer to form a hole transport layer, an electron blocking layer and a light-emitting layer in sequence: the vacuum degree is 5×10 -4 Pa, where the material of the hole transport layer is 1,3,4,5,7,8-hexafluoro-tetracyano-dimethy...

Embodiment 2

[0075] The structure of the organic electroluminescent device of this embodiment is: glass / ITO / MoO 3 :2-TNATA / TAPC / Ir(MDQ) 2 (acac):NPB / Gaq 3 / LiN 3 :TPBi / Gaq 3 / LiN 3 :TPBi / Ag.

[0076] The preparation of the organic electroluminescent device of this embodiment is as follows:

[0077] (1) Form the ITO anode layer by sputtering on the glass substrate: place the glass substrate in deionized water containing detergent for ultrasonic cleaning. blow dry. Then, an ITO anode layer is formed on the glass surface by magnetron sputtering, and the thickness of the anode layer is 100 nanometers. The glass substrate formed with the ITO anode layer is placed in a plasma treatment chamber for plasma treatment.

[0078] (2) Vacuum evaporation on the ITO anode layer to form a hole transport layer, an electron blocking layer and a light-emitting layer in sequence: the vacuum degree is 1×10 -3 Pa, where the material of the hole transport layer is molybdenum oxide (MoO 3 ) doped 4,4′,4...

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Abstract

The invention relates to an organic light-emitting device comprising a substrate, an anode layer, a hole transport layer, an electron blocking layer, a light emitting layer, an electron transport layer and a cathode layer. The electron transport layer includes at least one electron transport unit including an n type blocking portion stacked on the light emitting layer and an n type doped transport portion stacked at the n type blocking portion; the n type blocking portion is made of an organic metal complex that is formed by cooperation of one of beryllium, gallium, zinc, indium and aluminum and one of hydroxyquinoline, hydroxyquinoline derivative, hydroxybenzo[h]quinoline and hydroxybenzo[h]quinoline derivative; and the n type doped transport portion is made of a material containing an electron transport matrix material and an n type doping agent doped in the electron transport matrix material. According to the invention, the provided organic light-emitting device has advantages of high luminous efficiency and long service life. In addition, the invention also provides a preparation method of the organic light-emitting device.

Description

technical field [0001] The invention relates to the field of electronic devices, in particular to an organic electroluminescent device and a preparation method thereof. Background technique [0002] Organic electroluminescent diodes have a sandwich-like structure, with a cathode and an anode at the top and bottom, and a single or multiple functional layers of organic materials of different materials and structures sandwiched between the two electrodes, followed by hole injection. layer, hole transport layer, light emitting layer, electron transport layer and electron injection layer. The organic electroluminescent device is a carrier-injection light-emitting device. After the anode and the cathode are applied with an operating voltage, holes are injected from the anode and electrons from the cathode into the organic material layer of the working device respectively. Hole-electron pairs are formed in the luminescent material to emit light, and then the light is emitted from ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/54H01L51/56
CPCH10K85/6565H10K85/326H10K85/324H10K85/381H10K50/16H10K50/18H10K71/00
Inventor 周明杰王平冯小明钟铁涛
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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