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Organic light emission diode and preparation method thereof

An electroluminescent device and electroluminescent technology, applied in the field of electric light sources, can solve the problems of poor stability, short service life, and increased forbidden band width of OLED, and achieve the effects of high qualified rate of finished products, reduction of production cost, and improvement of production efficiency

Inactive Publication Date: 2014-09-10
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

[0005] However, in practical applications, it is found that the organic electroluminescent materials used in the organic functional layers of OLEDs are particularly sensitive to the intrusion of oxygen and water vapor, resulting in poor stability and short service life of OLEDs, which affects the popularization and application of OLEDs.
This is because oxygen is a triplet quencher, which significantly reduces the quantum efficiency of luminescence; on the other hand, the oxidation of oxygen to the luminescent layer will generate carbonyl compounds, which are also equivalent to quenchers, which significantly affect the quantum efficiency of luminescence. At the same time, the oxidized light-emitting layer will form black spots after deterioration, and the band gap will increase with the decrease of luminous efficiency; in addition, oxygen will also oxidize the hole transport layer to make the transport energy decrease.
The influence of water vapor is more obvious, and its main destruction method is the hydrolysis of electrical conductivity and organic layer compounds, which greatly reduces the stability

Method used

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  • Organic light emission diode and preparation method thereof
  • Organic light emission diode and preparation method thereof
  • Organic light emission diode and preparation method thereof

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preparation example Construction

[0050] Correspondingly, the embodiment of the present invention also provides a method for preparing the organic electroluminescent device described above. The process flow chart of the method is as image 3 Therefore, see also Figure 1~2 , The method includes the following steps:

[0051] S01. Provide a transparent substrate layer 1;

[0052] S02. Preparation of anode layer 2: In step S01, the surface of the transparent substrate layer 1 is plated with anode layer 2;

[0053] S03. Preparation of organic functional layer 3: In step S02, a hole injection layer 31, a hole transport layer 32, a light emitting layer 33, and an electron transport layer 34 are sequentially plated on the surface of the anode layer 2 opposite to the bonding surface of the light-transmitting substrate layer 1 , The electron injection layer 35 forms the organic functional layer 3;

[0054] S04. Preparation of the cathode layer 4: The cathode layer 4 is plated on the outer surface of the organic functional la...

Embodiment 1

[0077] An organic electroluminescent device whose structure is: glass substrate / ITO / MoO 3 :NPB / TCTA / TPBI:Ir(ppy) 3 / Bphen / CsN 3 :Bphen / Al / (TPD:Bphen / MgAl 2 O 4 :SiC:CdS) 6 .

[0078] The preparation method of the organic electroluminescent device includes the following steps:

[0079] a) Pre-treatment of ITO glass substrate: acetone cleaning→ethanol cleaning→deionized water cleaning→ethanol cleaning, all are cleaned with an ultrasonic cleaning machine, a single washing is cleaned for 5 minutes, then dried with nitrogen, and the oven is dried for use; The cleaned ITO glass needs surface activation treatment to increase the oxygen content of the conductive surface layer and improve the work function of the conductive layer surface; the thickness of ITO is 100nm;

[0080] b) Preparation of the organic functional layer: sequentially plate a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer on the outer surfa...

Embodiment 2

[0091] An organic electroluminescent device whose structure is: glass substrate / ITO / MoO 3 :NPB / TCTA / TPBI:Ir(ppy) 3 / Bphen / CsN 3 :Bphen / Al / (BCP:NPB / Bi 2 Ti 4 O 11 :WC:PbS) 6 .

[0092] The preparation method of the organic electroluminescent device includes the following steps:

[0093] a), b), c) Same as in Example 1;

[0094] d) Production of organic barrier layer: The organic barrier layer is made by co-evaporating the hole transport material as NPB and the electron transport material as BCP doping. Among them, the hole transport material accounts for 50% of the total mole percentage of the organic barrier layer material, using vacuum Prepared by evaporation, vacuum degree 5×10 -5 Pa, evaporation rate Thickness 250nm;

[0095] e) Production of inorganic barrier layer: The inorganic barrier layer is made of alloy compound, sulfide and carbide doped magnetron sputtering, and the alloy compound is Bi 2 Ti 4 O 11 The carbide is WC and the sulfide is PbS. Among them, WC accounts for 30%...

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Abstract

The invention discloses an organic light emission diode (OLED) and a preparation method thereof. The organic light emission diode consists of a transparent substrate layer, an anode layer, an organic functional layer, a cathode layer, an organic barrier layer and an inorganic barrier layer, wherein the transparent substrate layer, the anode layer, the organic functional layer, and the cathode layer are successively laminated and combined and the organic barrier layer and the inorganic barrier layer are successively and alternately laminated at the outer surface of the cathode layer. Materials used by the inorganic barrier layer include alloy compounds, sulfides and carbides, wherein the components are doped mutually; the sulfides account for 10% to 20%, by weight, of the total weight of the inorganic barrier layer materials and the carbides account for 10% to 30%, by weight, of the total weight of the inorganic barrier layer materials. According to the invention, corrosion of active materials like water and oxygen and the like on the organic light emission diode can be effectively reduced, thereby obviously improving the stable performance of the OLED and prolonging the service life of the OLED. Besides, the preparation method has advantages of simple process, easily-controlled condition, and easily-large area preparation.

Description

Technical field [0001] The invention belongs to the technical field of electric light sources, and specifically relates to an organic electroluminescence device and a preparation method thereof. Background technique [0002] Organic Light Emission Diode (Organic Light Emission Diode, hereinafter referred to as OLED) is a current-type semiconductor light-emitting device based on organic materials. Its typical structure is to make a layer of tens of nanometers thick organic luminescent material as a light-emitting layer on ITO glass, and a metal electrode with a low work function is placed on the light-emitting layer. [0003] The light-emitting principle of OLED 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, and holes are injected from the anode to the highest occupied orbital (HOMO) of organic matter. Electrons and holes meet and recombine in the l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/52H01L51/56
CPCH10K50/8445H10K50/844
Inventor 周明杰钟铁涛张娟娟王平
Owner OCEANS KING LIGHTING SCI&TECH CO LTD