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Organic electroluminescent device and preparation method thereof

An electroluminescent device and luminescent technology, which is applied in the direction of electric solid-state devices, semiconductor/solid-state device manufacturing, electrical components, etc., can solve the problem of low starting voltage of organic electroluminescent devices, and achieve improved electron transmission efficiency and service life No effect, the effect of reducing the quenching phenomenon

Inactive Publication Date: 2015-10-14
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the above-mentioned technical problems, the present invention provides an organic electroluminescent device and a preparation method thereof, the organic electroluminescent device comprises a conductive anode, a hole transport layer, a light-emitting layer, an electron transport layer and a cathode stacked in sequence layer, the material of the electron transport layer is a mixed material formed by organic lithium, metal simple substance and organic electron transport material, organic lithium is not easy to produce free metal Li + , so Li + Diffusion phenomenon is slowed down, and at the same time, the start-up voltage of the organic electroluminescent device of the present invention is low, thereby prolonging the service life and luminous efficiency of the organic electroluminescent device

Method used

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  • Organic electroluminescent device and preparation method thereof

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Effect test

Embodiment 1

[0049] A method for preparing an organic electroluminescent device, comprising the following steps:

[0050] (1) Provide ITO conductive glass as the conductive anode 1 and clean it. The square resistance of the ITO conductive glass is 5Ω / □; the degree of vacuum is 1×10 -5 In the vacuum coating system of Pa, the hole transport layer 2 is prepared by vacuum evaporation on the surface of ITO conductive glass; the material of the hole transport layer is a mixed material formed by F4-TCNQ and NPB in a mass ratio of 1:100 , the thickness of the hole transport layer is 20nm, wherein the evaporation rate of F4-TCNQ is 0.01nm / s, and the evaporation rate of NPB is 1nm / s;

[0051] In a vacuum of 1×10 -5 In the vacuum coating system of Pa, the luminescent layer 3 is prepared by vacuum evaporation on the surface of the hole transport layer. The material of the luminescent layer is DMQA, the thickness of the luminescent layer is 10nm, and the evaporation rate is 0.1nm / s;

[0052] (2) In a...

Embodiment 2

[0060] (1) Provide ITO conductive glass as the anode and clean it. The square resistance of the ITO conductive glass is 100Ω / □; the vacuum degree is 1×10 -3 In Pa's vacuum coating system, the hole transport layer is prepared by vacuum evaporation on the surface of ITO conductive glass; the material of the hole transport layer is a mixture of F6-TNAP and MeO-TPD with a mass ratio of 10:100. Materials, the thickness of the hole transport layer is 60nm, the evaporation rate of F6-TNAP is 0.05nm / s, and the evaporation rate of MeO-TPD is 0.5nm / s.

[0061] In a vacuum of 1×10 -3 In Pa's vacuum coating system, the light-emitting layer is prepared by vacuum evaporation on the surface of the hole transport layer. The material of the light-emitting layer is C545T, the thickness of the light-emitting layer is 30nm, and the evaporation speed is 0.5nm / s;

[0062] (2) In a vacuum of 1×10 -3 In the vacuum coating system of Pa, the electron transport layer is prepared by vacuum evaporation ...

Embodiment 3

[0070] A method for preparing an organic electroluminescent device, comprising the following steps:

[0071] (1) Provide ITO conductive glass as the anode and clean it. The square resistance of the ITO conductive glass is 50Ω / □; the vacuum degree is 1×10 -4 In the vacuum coating system of Pa, the hole transport layer is prepared by vacuum evaporation on the surface of ITO conductive glass; the material of the hole transport layer is a mixed material formed by F2-HCNQ and TPD in a mass ratio of 5:100, The thickness of the hole transport layer is 40nm, the evaporation rate of F2-HCNQ is 0.01nm / s, and the evaporation rate of TPD is 0.2nm / s.

[0072] In a vacuum of 1×10 -4 In Pa's vacuum coating system, the luminescent layer is prepared by vacuum evaporation on the surface of the hole transport layer. The material of the luminescent layer is Rubrene, the thickness of the luminescent layer is 15nm, and the evaporation rate is 0.2nm / s;

[0073] (2) In a vacuum of 1×10 -4In the va...

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Abstract

The invention discloses an organic electroluminescent device and a preparation method thereof. The organic electroluminescent device comprises an conductive anode, a hole transport layer, a light emitting layer, an electron transport layer and a cathode layer; wherein the conductive anode, the hole transport layer, the light emitting layer, the electron transport layer and the cathode layer are successively laminated. The electron transport layer is made of a mixed material which is composed of organic lithium, a metal element and an organic electron transport material. The organic lithium is 4-hydroxyl phenanthridine lithium, 2-(5-phenyl-1,3,4-oxadiazole)-phenol lithium, 2,3-diphenyl-5-hydroxyquionline lithium, lithium tetra(8-hydroxyquinolinato)boron, tert-butylcyclopentadienyl lithium or lithium acetylacetonate. The metal element and the cathode layer are made of same materials, namely silver or aluminum. The organic electrode transport material is 8-hydroxyquinoline aluminum, 4,7-diphenyl-phenanthroline, 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene or 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline. The organic electroluminescent device has long service life and relatively high light emitting efficiency.

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] The luminescence principle of organic electroluminescent devices (OLEDs) is based on the fact that electrons are injected from the cathode to the lowest unoccupied molecular orbital (LUMO) of organic matter under the action of an external electric field, while 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] At present, the electron transport la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/52H01L51/54H01L51/56
Inventor 周明杰冯小明张娟娟王平
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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