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Organic electroluminescent device and preparation method

An electroluminescent device and a luminescent technology, which are applied in the manufacture of organic semiconductor devices, electric solid devices, semiconductor/solid devices, etc., can solve the problems of total reflection loss, low light extraction performance, poor refractive index, etc., and achieve narrowing of the refractive index Poor, high light extraction efficiency, and the effect of improving hole injection efficiency

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

[0004] In traditional light-emitting devices, the anode glass substrate is generally used as the light-emitting surface. In this structure, the light is first absorbed and reflected by the anode conductive material, and then absorbed and reflected by the glass, and finally can be emitted to the air. , but there is a difference in refractive index between the glass and the anode interface (such as the difference in refractive index between glass and ITO (indium tin oxide), the refractive index of glass is 1.5, and ITO is 1.8), and the light reaches the glass from ITO, just Total reflection will occur, causing the loss of total reflection, resulting in lower overall light extraction performance

Method used

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  • Organic electroluminescent device and preparation method

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Embodiment 1

[0046] A method for preparing an organic electroluminescent device, comprising the following steps:

[0047] (1) Choose N-LASF44 glass (refractive index: 1.8, light transmittance at 400nm: 96%) as the glass substrate 1, wash the glass substrate 1 with distilled water and ethanol in sequence, and place it in isopropyl Soak in alcohol overnight, rinse and air dry.

[0048] (2) Prepare the anode layer 2 on the light-emitting surface of the glass substrate. First, prepare the hafnium-containing compound layer 21 on the light-emitting surface of the glass substrate 1 by electron beam evaporation. The material of the hafnium-containing compound layer 21 is HfO 2 , the thickness is 60nm, and the energy density of electron beam evaporation is 30W / cm 2 , and then on the hafnium-containing compound layer 21, a conductive metal element layer 22 and a praseodymium oxide layer 23 are sequentially prepared by using a thermal resistance evaporation method. for PrO 2 , with a thickness of ...

Embodiment 2

[0059] A method for preparing an organic electroluminescent device, comprising the following steps:

[0060] (1) Choose N-LAF36 glass (refractive index 1.8, light transmittance at 400nm is 95%) as the glass substrate, rinse the glass substrate with distilled water and ethanol in sequence, and place it in isopropanol Soak overnight, rinse and air dry.

[0061] (2) Prepare the anode layer on the light-emitting surface of the glass substrate. First, prepare a hafnium-containing compound layer on the light-emitting surface of the glass substrate by electron beam evaporation. The material of the hafnium-containing compound layer is HfB 2 , the thickness is 20nm, and the energy density of electron beam evaporation is 10W / cm 2 , and then on the hafnium-containing compound layer, a conductive metal element layer and a praseodymium oxide layer are sequentially prepared by a thermal resistance evaporation method. The material of the conductive metal element layer is Al with a thickness...

Embodiment 3

[0072] A method for preparing an organic electroluminescent device, comprising the following steps:

[0073] (1) Select N-LASF31A glass (refractive index 1.9, light transmittance at 400nm is 92%) as the glass substrate, rinse the glass substrate with distilled water and ethanol in sequence, and place it in isopropanol Soak overnight, rinse and air dry.

[0074] (2) Prepare the anode layer on the light-emitting surface of the glass substrate. Firstly, the hafnium-containing compound layer is prepared on the light-emitting surface of the glass substrate by electron beam evaporation. The material of the hafnium-containing compound layer is HfO 2 , the thickness is 100nm, and the energy density of electron beam evaporation is 100W / cm 2 , and then on the hafnium-containing compound layer, a conductive metal element layer and a praseodymium oxide layer are sequentially prepared by a thermal resistance evaporation method. The material of the conductive metal element layer is Pt with a...

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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 anode layer is composed of a hafnium-containing compound layer, a conductive single metal layer and a praseodymium oxide layer which are successively laminated. The hafnium-containing compound has high refractive index and high light transmittance, thus reducing refractive index difference between an anode and the glass substrate, avoiding total reflection and effectively enhancing light extraction efficiency. The conductive single metal plays a role in electric conduction, thus raising carrier transmission efficiency, reducing interior energy consumption of the device and making energy to be used more in light extraction. The highest occupied molecular orbital energy of the praseodymium oxide is high, thus guaranteeing hole injection. 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): H01L51/52H01L51/54H01L51/56
CPCH10K71/166H10K50/81H10K2102/00H10K71/00
Inventor 周明杰王平黄辉
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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