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Organic electroluminescence device and preparation method thereof

An electroluminescent device and electroluminescent technology, which are applied in the fields of electro-solid devices, semiconductor/solid-state device manufacturing, electrical components, etc., can solve the problems of reducing the recombination probability of electrons and holes, easily forming electron defects, and electron quenching.

Inactive Publication Date: 2015-05-27
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

[0003] The electron injection layer of traditional organic electroluminescent devices generally uses lithium fluoride, but because the melting point of lithium fluoride is too high, a large current must be used for evaporation during evaporation, and the evaporation room of the organic evaporation room is too high , will damage other organic functional layers, and the film-forming property of lithium fluoride is poor, and it is easy to form electron defects, resulting in the quenching of electrons and reducing the recombination probability of electrons and holes

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  • Organic electroluminescence device and preparation method thereof
  • Organic electroluminescence device and preparation method thereof
  • Organic electroluminescence device and preparation method thereof

Examples

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preparation example Construction

[0036] The preparation method of the organic electroluminescence device 100 of an embodiment, it comprises the following steps:

[0037] Step S110 , sequentially forming a hole injection layer 20 , a hole transport layer 30 , a light emitting layer 40 , an electron transport layer 50 and an electron injection layer 60 on the surface of the anode 10 .

[0038] 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), preferably ITO, and the thickness of the anode 10 is 50 nm to 300 nm, preferably 80 nm.

[0039] In this embodiment, before the hole injection layer 20 is formed on the surface of the anode 10, the anode 10 is pretreated. The pretreatment includes: performing photolithography on the anode 10, cutting it into the required size, using detergent, deionized Water, acetone, ethanol, and isopropanone were each ultrasonically cleaned for 15 minutes to remove organic po...

Embodiment 1

[0055] The structure ITO / MoO prepared in this embodiment 3 / NPB / Alq 3 / Bphen / Rb 2 CO 3 :Ca / Mg:Li 2 O / Ag organic electroluminescence device, in this embodiment and the following embodiments, " / " indicates a layer, and ":" indicates doping.

[0056] Magnetron sputtering anode on the glass substrate, the material is ITO, and then photolithography treatment, cut into the required size, followed by detergent, deionized water, acetone, ethanol, isopropanol ultrasonic 15min each, to remove the glass surface organic pollutants; after cleaning, carry out proper treatment on the conductive substrate: oxygen plasma treatment, the treatment time is 5min, the power is 30W; the thickness is 80nm, and the hole injection layer is evaporated, and the material is MoO 3 , with a thickness of 25nm; the vapor-deposited hole transport layer, the material is NPB, and the thickness is 55nm; the vapor-deposited light-emitting layer, the material is Alq 3 , with a thickness of 16nm; the vapor-depo...

Embodiment 2

[0063] The structure prepared in this example is IZO / V 2 o 5 / TCTA / DCJTB / Bphen / RbCl:Sr / Sr:LiF / Au organic electroluminescent device.

[0064] Magnetron sputtering anode on the glass substrate, the material is IZO, and then photolithography treatment, cut into the required size, followed by detergent, deionized water, ultrasonic 15min, remove the organic pollutants on the glass surface; Hole injection layer: the material is V 2 o 5 , with a thickness of 50nm; evaporated hole transport layer: the material is TCTA, with a thickness of 45nm; evaporated luminescent layer: the selected material is DCJTB, with a thickness of 8nm; evaporated electron transport layer, the material is Bphen, with a thickness of 65nm; The injection layer includes a rubidium compound-doped layer and a metal-doped layer. The rubidium compound-doped layer is deposited by thermal resistance evaporation. The material is RbCl:Sr, the mass ratio of RbCl to Sr is 1:1, and the thickness is 50nm; The surface of...

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Abstract

An organic electroluminescence device comprises an anode, a hole injection layer, a hole transport layer, a luminescent layer, an electron transport layer, an electron injection layer and a cathode which are stacked in sequence, wherein the electron injection layer consists of a rubidium compound doped layer and a metal doped layer; the rubidium compound doped layer comprises a rubidium compound material and a metal material I doped in the rubidium compound material; the rubidium compound material is at least one of rubidium carbonate, rubidium chloride, rubidium nitrate and rubidium sulfate; the work function of the metal material I is -2.0 eV to -3.5 eV; the metal doped layer comprises a metal material II and a lithium salt material doped in the metal material II; the work function of the metal material II is -2.0 eV to -3.5 eV; the lithium salt material is at least one of lithium oxide, lithium fluoride, lithium chloride and lithium bromide. The organic electroluminescence device is relatively high in luminescence efficiency. The invention further provides a preparation method of the organic electroluminescence 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] The electron injection layer of traditional organic electroluminescent devices generally uses lithium fluoride, but because the m...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/54H01L51/56
Inventor 周明杰黄辉陈吉星王平
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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