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Method and application of n-type doping of electron transport materials based on inert metals

A technology of electron transport materials and inert metals, applied in circuits, electrical components, electrical solid devices, etc., can solve the problems of unclear mechanism of action, difficulty in long-term storage and use, unfavorable industrial production, etc., to achieve stable evaporation atmosphere, Easy to store and use, beneficial to industrial production

Active Publication Date: 2021-05-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this has a certain effect, Ag penetrates into Bphen [4,7-diphenyl-1,10-phenanthroline] or BCP [2,9-dimethyl-4,9-diphenyl-1 ,10-Phenanthroline] has a limited amount and can only form composites at the interface, and the mechanism of action is not clear
Chinese patent CN201110325422.2 discloses to dope ETM with active metal M to achieve n-type doping effect, in which this type of active metal itself has a low work function and directly acts as a strong reducing n-type dopant, and in the air Medium unstable, difficult to store and use for a long time, not conducive to industrial production

Method used

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  • Method and application of n-type doping of electron transport materials based on inert metals
  • Method and application of n-type doping of electron transport materials based on inert metals
  • Method and application of n-type doping of electron transport materials based on inert metals

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preparation example Construction

[0036] The preparation process of the organic electroluminescence device of the present invention is the same as that of the prior art, wherein the preparation steps of the electron transport layer 08 can be conventional vacuum co-evaporation and other steps.

[0037] The vapor deposition rate of the control metal should be relatively slow, being 0.1 angstrom / second. At this rate, the contact between the host material of the electron transport layer and the dopant material compound with coordination properties and the inert metal is more sufficient, so that the inert metal M It is more uniformly dispersed in the electron transport host material, which is conducive to recombination.

Embodiment 1

[0039] In this example, the ligands with coordination properties represented by formula (L6) are used to connect the ETM1-ETM7 electron transport materials shown in the following structure, and the electron transport host materials with coordination properties ETM1-Phen~ETM7- Phen.

[0040] The specific preparation method of ETM1-Phen includes:

[0041]

[0042] Take 5.0g of 4,7-dibromophenanthroline, 6.2g of 1-naphthaleneboronic acid, 6.1g of potassium carbonate and 1.29g of tetrakis(triphenylphosphine)palladium(0) in a 500ml round bottom flask, then add 100ml of toluene, Stir with 50ml of water and 50ml of ethanol, replace with nitrogen, raise the temperature to 90°C, react for 48 hours, then cool down to terminate the reaction, separate the liquids, extract the organic phase with dichloromethane and rotary evaporate the organic phase, then use dichloromethane / a small amount of methanol solution to dissolve Partial sublimation yields the product.

[0043] The specific p...

Embodiment 2

[0056] The structure of a single-electron device:

[0057] ITO / Bphen(100nm) / ETM1-Phen(5-30%w.t.%,5-100nm) / Al;

[0058] First electrode layer 02 (anode ITO) / hole blocking layer 07 (Bphen) / electron transport layer 08 (x%ETM1-Phen~ETM7-Phen) / second electrode layer 03 (cathode Al);

[0059] The host material of the electron transport layer in this embodiment is ETM1-Phen, and the doped inert metal is Ag.

[0060] Such as figure 2 As shown, device 1 is the curve corresponding to ETM / Al;

[0061] Device 2 is the curve corresponding to ETM1-Phen / Al;

[0062] Device 3 is the curve corresponding to ETM2-Phen / Al;

[0063] Device 4 is the curve corresponding to ETM3-Phen / Al;

[0064] Device 5 is the curve corresponding to ETM4-Phen / Al;

[0065] Device 6 is the curve corresponding to ETM5-Phen / Al;

[0066] Device 7 is the curve corresponding to ETM6-Phen / Al;

[0067] Device 8 is the curve corresponding to ETM7-Phen / Al;

[0068] The cathodes of devices 1-2 are all Al, where:

[...

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Abstract

The invention belongs to the technical field of organic electroluminescent devices, in particular to a method for realizing N-type doping of electron transport materials based on inert metals, and further discloses the application of the method in preparing organic electroluminescent devices. The method for N-type doping of electron transport materials based on inert metals in the present invention uses ligand compounds with coordination functions to connect with existing general electron transport materials, so that the general electron transport materials increase some The performance of the group, and make it have a coordination function, and then can use its coordination with M n+ Coordination occurs to promote the inert metal M to lose electrons and reduce its work function, so that the inert metal can achieve the N-type doping effect similar to the active alkali metal, improve the transmission characteristics of the electron transport material, reduce the injection barrier of electrons, and enhance the electron density. injection.

Description

technical field [0001] The invention belongs to the technical field of organic electroluminescent devices, in particular to a method for realizing N-type doping of electron transport materials based on inert metals, and further discloses the application of the method in preparing organic electroluminescent devices. Background technique [0002] Organic Light Emitting Diode (OLED) is a multilayer organic thin film structure device that can emit light through electroluminescence. It has a variety of display characteristics and quality beyond LCD (Liquid Crystal Display). With its excellent characteristics such as low energy consumption and flexibility, it has a good application prospect and will become the next generation of mainstream flat-panel displays. [0003] In OLEDs, the LUMO energy level of the commonly used electron transport material (ETM) is around -3.0eV, and the work function of the metal cathode is generally greater than 4.0eV. Therefore, when electrons are dire...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/56H01L51/54H01L51/50
CPCH10K85/60H10K50/165H10K71/00
Inventor 段炼宾正杨
Owner TSINGHUA UNIV
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