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Organic electroluminescent device and preparation method

An electroluminescence device and electroluminescence technology, which are applied in the manufacturing of organic semiconductor devices, electric solid state devices, semiconductor/solid state devices, etc., can solve the problems of low light output performance, refractive index difference, light loss, etc. Improve stability and improve the effect of light scattering

Inactive Publication Date: 2014-08-27
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because the material of the existing hole injection layer is usually metal oxides such as molybdenum trioxide, its light absorption rate in the visible light range is relatively high, resulting in light loss; in addition, the metal oxides such as molybdenum trioxide and the hole transport layer The properties of organic materials are quite different, and there is a difference in refractive index between the two interfaces, which is easy to cause total reflection, resulting in lower overall light extraction performance of OLEDs

Method used

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  • Organic electroluminescent device and preparation method

Examples

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Embodiment 1

[0041] A method for preparing an organic electroluminescent device, comprising the following steps:

[0042] (1) After rinsing the glass with distilled water and ethanol, soak it in isopropanol overnight. Prepare the anode 2 by vapor deposition on the glass substrate 1, the material of the anode 2 is Ag, the thickness is 10nm, and the vapor deposition pressure is 8×10 -4 Pa, the evaporation rate is 2nm / s.

[0043] (2) The hole injection layer 3 is prepared on the anode 2 by electron beam evaporation, and the material of the hole injection layer is SiO 2 with PrO 2 A mixed material formed at a mass ratio of 0.15:1 (expressed as PrO 2 :SiO2 2 ), the thickness of the hole injection layer is 10nm, and the energy density of electron beam evaporation is 30W / cm 2 .

[0044] (3) Hole transport layer 4, light-emitting layer 5, electron transport layer 6, electron injection layer 7 and cathode 8 are sequentially evaporated on the hole injection layer to obtain an organic electrolu...

Embodiment 2

[0053] A method for preparing an organic electroluminescent device, comprising the following steps:

[0054] (1) After rinsing the glass with distilled water and ethanol, soak it in isopropanol overnight. Prepare the anode by evaporation on the glass substrate, the anode material is Al, the thickness is 5nm, and the evaporation pressure is 2×10 -3 Pa, the evaporation rate is 10nm / s.

[0055] (2) The hole injection layer is prepared by electron beam evaporation on the anode, and the material of the hole injection layer is SiO 2 with Pr 2 o 3 A mixed material formed at a mass ratio of 0.5:1 (expressed as Pr 2 o 3 :SiO2 2 ), the thickness of the hole injection layer is 5nm, and the energy density of electron beam evaporation is 10W / cm 2 .

[0056] (3) On the hole injection layer, the hole transport layer, the light emitting layer, the electron transport layer, the electron injection layer and the cathode are sequentially evaporated to obtain an organic electroluminescence...

Embodiment 3

[0065] A method for preparing an organic electroluminescent device, comprising the following steps:

[0066] (1) After rinsing the glass with distilled water and ethanol, soak it in isopropanol overnight. Prepare the anode by evaporation on the glass substrate, the anode material is Au, the thickness is 30nm, and the evaporation pressure is 5×10 -5 Pa, the evaporation rate is 1nm / s.

[0067] (2) The hole injection layer is prepared by electron beam evaporation on the anode, and the material of the hole injection layer is SiO and Yb 2 o 3 A mixed material formed at a mass ratio of 0.1:1 (expressed as Yb 2 o 3 :SiO), the thickness of the hole injection layer is 5nm, and the energy density of electron beam evaporation is 100W / cm 2 .

[0068] (3) On the hole injection layer, the hole transport layer, the light emitting layer, the electron transport layer, the electron injection layer and the cathode are sequentially evaporated to obtain an organic electroluminescence device,...

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Abstract

The invention discloses an organic electroluminescent device which comprises a glass substrate, an anode layer, a hole injection layer, a hole transport layer, a luminescent layer, an electron transport layer, an electron injection layer and a cathode which are successively laminated. The material of the hole injection layer is a mixed material formed by silicon oxide and praseodymium dioxide, praseodymium oxide, samarium oxide or diytterbium ioxide. The silicon oxide is silicon monoxide or silicon dioxide. As work function of praseodymium dioxide, praseodymium oxide, samarium oxide or diytterbium ioxide in the material of the hole injection layer is high, it is suitable for hole injection. After being contacted with the anode, the hole injection layer matches barrier of the anode, thus making the hole easier to inject into the hole layer from the anode. The silicon oxide is stable, and stability of the device can be raised after the silicon oxide is doped to the hole injection layer. Meanwhile, scattering of light can be further raised by the silicon oxide, and the total reflection effect of the device can be reduced. The invention also discloses a preparation method of the organic electroluminescent device.

Description

technical field [0001] The invention relates to the field of organic electroluminescence, in particular to an organic electroluminescence device and a preparation method thereof. Background technique [0002] In 1987, C.W.Tang and Van Slyke of Eastman Kodak Company in the United States reported a breakthrough in the research of organic electroluminescence. A high-brightness, high-efficiency double-layer organic electroluminescent device (OLED) has been prepared using ultra-thin film technology. Brightness up to 1000cd / m at 10V 2 , its luminous efficiency is 1.51lm / W, and its lifespan is more than 100 hours. [0003] The principle of OLED light emission is based on the action of an external electric field, electrons are injected from the cathode to the lowest unoccupied molecular orbital (LUMO) of organic matter, and holes are injected from the anode to the highest occupied orbital (HOMO) of organic matter. Electrons and holes meet, recombine, and form excitons in the ligh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/56
CPCH10K50/17H10K2102/00H10K71/00
Inventor 周明杰王平黄辉
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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