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Organic light-emitting device and preparation method thereof

An electroluminescent device and a luminescent technology, applied in the direction of electric solid-state devices, semiconductor/solid-state device manufacturing, electrical components, etc., can solve the problems of reducing the luminous efficiency of organic electroluminescent devices and the low probability of hole and electron recombination, etc. To achieve the effect of increasing the recombination probability and improving the luminous efficiency

Inactive Publication Date: 2013-09-11
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in organic small molecule materials, the hole transport rate is more than two orders of magnitude higher than the electron transport rate. Therefore, the recombination probability of holes and electrons is often low, thereby reducing the luminous efficiency 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

Examples

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preparation example Construction

[0039] Please also see figure 2 , the preparation method of the organic electroluminescent device 100 of an embodiment, it comprises the following steps:

[0040] Step S110 , forming a hole injection layer 20 on the surface of the anode 10 .

[0041] The anode 10 is indium tin oxide glass (ITO), fluorine doped tin oxide glass (FTO), aluminum doped zinc oxide glass (AZO) or indium doped zinc oxide glass (IZO).

[0042] In this embodiment, the anode 10 is pretreated before the hole injection layer 20 is formed on the surface of the anode 10 . The pretreatment of the anode 10 includes removing organic pollutants on the surface of the anode 10 and performing oxygen ion treatment on the anode 10 . The anode 10 is ultrasonically cleaned with detergent, deionized water, acetone, ethanol, and isopropanone for 15 minutes to remove organic pollutants on the surface of the substrate 10; the anode 10 is treated with oxygen ion for 5 minutes to 15 minutes, and the power is 10 minutes. ...

Embodiment 1

[0059] Sonicate ITO with detergent, deionized water, acetone, ethanol, and isopropanol for 15 minutes in order to remove organic pollutants on the glass surface. After cleaning, it is treated with oxygen plasma. The oxygen plasma treatment time is 5-15 minutes. , the power is 10-50W; the hole injection layer is evaporated, and the material is MoO 3 , the thickness is 40nm; electron beam evaporation inorganic quantum well, n=2, the thickness of ZnO is 20nm, lithium salt material is Li 2 CO 3 , with a thickness of 10nm; evaporated light-emitting layer, the material is Alq 3 , with a thickness of 30nm; the vapor-deposited electron transport layer, the material is TPBi, and the thickness is 60nm; the vapor-deposited electron injection layer, the material is CsN 3 , the thickness is 5nm; the vapor-deposited cathode, the material is Ag, and the thickness is 150nm, and finally the required inorganic quantum well organic electroluminescent device is obtained.

[0060] see image 3...

Embodiment 2

[0064] Sonicate ITO with detergent, deionized water, acetone, ethanol, and isopropanol for 15 minutes in order to remove organic pollutants on the glass surface. After cleaning, it is treated with oxygen plasma. The oxygen plasma treatment time is 5-15 minutes. , the power is 10-50W; the hole injection layer is evaporated, and the material is WO 3, the thickness is 80nm; electron beam evaporation inorganic quantum well, n=1, the thickness of ZnO is 20nm, the lithium salt material is LiF, the thickness is 5nm; the evaporation light-emitting layer, the material is DCJTB, the thickness is 50nm; evaporation electron transport layer, the material is TPBi, and the thickness is 80nm; the vapor-deposited electron injection layer is made of LiF, and the thickness is 0.5nm; the vapor-deposited cathode is made of Ag, and the thickness is 150nm, and finally the required inorganic quantum well organic electroluminescent device is obtained. .

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Abstract

An organic light-emitting device comprises an anode, a hole injection layer, a quantum well layer, a luminescent layer, an electron transport layer, an electron injection layer and a cathode, wherein the anode, the hole injection layer, the quantum well layer, the luminescent layer, the electron transport layer, the electron injection layer and the cathode are stacked in sequence. The quantum well layer comprises a first zinc oxide layer, a lithium salt layer and a second zinc oxide layer, wherein the first zinc oxide layer, the lithium salt layer and the second zinc oxide layer are stacked in sequence. The material of the lithium salt layer is lithium fluoride or lithium carbonate or lithium chloride. The organic light-emitting device is high in luminous efficiency. In addition, the invention further provides a preparation method of the organic light-emitting device.

Description

【Technical field】 [0001] The invention relates to an organic electroluminescence device and a preparation method thereof. 【Background technique】 [0002] The luminescence principle of organic electroluminescent devices 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 molecular orbital (HOMO) of organic matter. Electrons and holes meet, recombine, and form excitons in the light-emitting layer. Excitons migrate under the action of an electric field, transfer energy to the light-emitting material, and excite electrons to transition from the ground state to the excited state. The excited state energy is deactivated by radiation to generate photons , releasing light energy. [0003] However, in organic small molecule materials, the hole transport rate is more than two orders of magnitude higher than the el...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/56
Inventor 周明杰王平黄辉张振华
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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